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 an oxygen-enriched assembly, the oxygen-enriched assembly comprises an oxygen-enriched membrane, a collection cavity and an oxygen reduction bin, the collection cavity and the oxygen reduction bin are arranged on the two opposite sides of the oxygen-enriched membrane, the oxygen-enriched assembly is used for enabling more oxygen in the oxygen reduction bin to penetrate through the oxygen-enriched membrane and enter the collection cavity relative to nitrogen, and the oxygen reduction bin is provided with at least two ventilation openings; the at least two air vents are used for communicating the at least two fresh-keeping chambers; the air inlet end of the air extractor is communicated with the collecting cavity of the oxygen enrichment assembly; and the switch piece is used for controlling opening and closing of the at least one ventilation opening and adjusting the proportion of the circulation areas of the at least two ventilation openings. According to the fresh-keeping device, the single air extractor and the single oxygen enrichment assembly are used for efficiently reducing oxygen in the at least two fresh-keeping chambers, and the cost is 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 benefits of low oxygen for fruit and vegetable preservation are 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 a multi-chamber preservation scheme with a simple structure is one of the research directions that the prior art needs to supplement. 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 achieve a multi-chamber preservation scheme 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 fresh-keeping chambers, and the fresh-keeping device comprises: an oxygen enrichment assembly, the oxygen enrichment assembly comprises an oxygen enrichment membrane, a collection cavity and an oxygen reduction bin, the opposite sides of the oxygen enrichment membrane are the collection cavity and the oxygen reduction bin, the oxygen enrichment assembly is used for making the oxygen in the oxygen reduction bin penetrate the oxygen enrichment membrane and enter the collection cavity more than nitrogen, the oxygen reduction bin has at least two air vents, and the at least two air vents are used for communicating with the at least two fresh-keeping chambers; an air extraction device, the air extraction device is communicated with the collection cavity of the oxygen enrichment assembly at the air inlet end, so as to suck the gas in the collection cavity into the air extraction device; and a switch piece, the switch piece is used for controlling the opening and closing of at least one air vent, and adjusting the proportion of the flow area of the at least two air vents.

[0006] The fresh-keeping device for refrigerator of the utility model embodiment can realize a scheme of efficiently reducing oxygen in at least two fresh-keeping chambers by a single air extraction device, and the number of air extraction devices is reduced. At least two fresh-keeping chambers share an oxygen enrichment assembly, the number of oxygen enrichment assemblies is reduced, and the cost is reduced.

[0007] The at least two air vents are communicated with the at least two fresh-keeping chambers, the switch member can control the opening and closing of the at least one air vent, and the ratio of the flow areas of the at least two air vents can be adjusted, so that the at least two fresh-keeping chambers have different oxygen reduction capabilities, and the oxygen concentration is designed in a differentiated manner to adapt to the oxygen concentration requirements of different types of food materials.

[0008] In some embodiments, the oxygen enrichment assembly comprises a box body, a box cavity of the box body constitutes the collection cavity, at least one box wall of the box body is the oxygen enrichment membrane, and the box body is located in the oxygen reduction bin.

[0009] Specifically, the box body is arranged in a spaced manner with the side wall of the oxygen reduction bin.

[0010] Further, the air extraction device is located outside the oxygen reduction bin, an air inlet end of the air extraction device is connected with the collection cavity through an air extraction pipe, and the air extraction pipe is arranged through the side wall of the oxygen reduction bin.

[0011] In some embodiments, the at least two air vents share the same switch member, or each air vent is provided with a separate switch member.

[0012] In some embodiments, the switch member is a sliding door or a rotating door.

[0013] In some embodiments, the fresh-keeping device further comprises air pipes, the air pipes are at least two, one end of each air pipe is communicated with the oxygen reduction bin to constitute the air vent, the other end of each air pipe is used for communicating with at least one fresh-keeping chamber, and the fresh-keeping chambers communicated by different air pipes are different.

[0014] The switch member is arranged on the air pipe or at the end of the air pipe.

[0015] In some embodiments, the fresh-keeping device further comprises a turbulence fan, and the turbulence fan is arranged at least one of the fresh-keeping chamber and the oxygen enrichment assembly.

[0016] Specifically, the turbulence fan is at least two, and the turbulence fan is arranged at each air vent.

[0017] The refrigerator according to the embodiments of the present application comprises a box body, at least two fresh-keeping chambers are arranged in the box body and are independent of each other, the refrigerator further comprises the fresh-keeping device for the refrigerator, and the at least two air vents are communicated with the at least two fresh-keeping chambers.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent from the following description, or will be learned from the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

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

[0020] Figure 1 For the structure schematic diagram of the refrigerator according to the embodiments of the present utility model;

[0021] Figure 2 For the assembly relationship schematic diagram of the fresh-keeping device and the fresh-keeping chamber of some embodiments;

[0022] Figure 3 For the sectional view diagram of the box body in some embodiments;

[0023] Figure 4 For the sectional view diagram of the oxygen enrichment assembly in some other embodiments;

[0024] Figure 5 For the assembly relationship diagram of the switch piece and the plurality of air vents in some other embodiments;

[0025] Figure 6 For the assembly relationship schematic diagram of the fresh-keeping device and the fresh-keeping chamber of some other embodiments.

[0026] Reference signs:

[0027] Refrigerator 1000,

[0028] Fresh-keeping device 100,

[0029] Oxygen enrichment assembly 1,

[0030] Box body 10, oxygen enrichment film 11, collection cavity 12, oxygen reduction bin 13, air vent 131,

[0031] Air extraction device 3, air extraction pump 31,

[0032] Air extraction pipe 41,

[0033] Switch piece 61, switch door plate 611, air vent pipe 62,

[0034] Turbulence fan 7,

[0035] Box body 200, fresh-keeping chamber 210. DETAILED DESCRIPTION

[0036] The embodiments of the present utility model will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present utility model, and cannot be understood as limiting the present utility model.

[0037] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0038] In the description of the utility model, it needs to be understood that the terms "mounting", "connection", "connection" should be understood broadly unless otherwise specified and limited, for example, it can be fixedly connected, or it can be detachably connected, or it can be 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.

[0039] Reference will be made below Figures 1-6 The fresh-keeping device 100 for the refrigerator and the refrigerator 1000 according to the embodiments of the utility model are described.

[0040] As Figure 1 shown, 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 after the refrigerator door is closed, the air does not flow between the fresh-keeping chambers 210, forming a relatively independent fresh-keeping environment.

[0041] Referring to Figure 2 , the fresh-keeping device 100 comprises an oxygen enrichment assembly 1, the oxygen enrichment assembly 1 comprises an oxygen enrichment film 11, a collection cavity 12 and an oxygen reduction bin 13, the opposite sides of the oxygen enrichment film 11 are the collection cavity 12 and the oxygen reduction bin 13, the oxygen enrichment assembly 1 is used for making the oxygen in the oxygen reduction bin 13 more permeate the oxygen enrichment film 11 and enter the collection cavity 12 relative to the nitrogen, and the oxygen reduction bin 13 has at least two air vents 131, and the at least two air vents 131 are used for communicating the at least two fresh-keeping chambers 210.

[0042] Therefore, the oxygen enrichment assembly 1 can form a gas atmosphere rich in nitrogen and poor in oxygen in the oxygen reduction bin 13, which is beneficial to the preservation of food. Since the oxygen reduction bin 13 is connected to the preservation chamber 210 through the air inlet 131, the gas in the preservation chamber 210 and the gas in the oxygen reduction bin 13 will diffuse and convect, so that a gas atmosphere rich in nitrogen and poor in oxygen is formed in the preservation chamber 210, which is beneficial to the preservation of food. By reducing the oxygen content in the fruit and vegetable storage space, the intensity of aerobic respiration of fruits and vegetables is reduced, while the basic respiration is ensured, anaerobic respiration of fruits and vegetables is inhibited, thereby facilitating long-term preservation of fruits and vegetables.

[0043] With reference to Figure 2 The preservation device 100 further comprises an air extraction device 3, the air extraction device 3 has an air inlet end, and the air inlet end of the air extraction device 3 is in communication with the collection cavity 12 of the oxygen enrichment assembly 1, so as to suck the gas in the collection cavity 12 into the air extraction device 3. Specifically, the air inlet end of the air extraction device 3 is connected with the collection cavity 12 of the oxygen enrichment assembly 1 through an air extraction pipe 41.

[0044] Specifically, the air extraction device 3 comprises an air extraction pump 31, and the air inlet end of the air extraction device 3 is the air inlet end of the air extraction pump 31. The air extraction pump 31 is adopted, which is stable in operation, high in reliability, and small in size. Of course, a blower can also be used to extract air in some schemes. For simplicity of description, the air extraction pump 31 is taken as an example in the following description.

[0045] That is, the air extraction pump 31 can extract the gas in the collection cavity 12 outward, so as to form a negative pressure in the collection cavity 12, and under the driving of the pressure difference, the gas in the preservation chamber 210 can be sucked into the preservation chamber 210 through the oxygen reduction bin 13. In this way, the air in the preservation chamber 210 can flow to the oxygen enrichment assembly 1, and under the action of the oxygen enrichment assembly 1, part or all of the oxygen in the air in the preservation chamber 210 can enter the collection cavity 12, and then be discharged from the preservation chamber 210 through the air extraction pipe 41 and the air extraction pump 31, so as to obtain a gas atmosphere rich in nitrogen and poor in oxygen in the preservation chamber 210, which is beneficial to the preservation of food.

[0046] The preservation device 100 for the refrigerator 1000 in the embodiment of the utility model can realize the scheme that a single air extraction device 3 performs efficient oxygen reduction on at least two preservation chambers 210. The number of air extraction devices 3 is reduced, and the cost is reduced.

[0047] It can be understood that, as the refrigerator 100 is used, the user will open the refrigerator door to take and place foodstuffs from time to time. 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 separated from the external environment and becomes an independent space, and the air extraction device 3 operates to extract air in the fresh-keeping chamber 210, and the oxygen content in the extracted air is relatively high, so that the air volume and the oxygen content in the fresh-keeping chamber 210 decrease. The above process is recycled again after the next time the refrigerator door is opened, 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.

[0048] Further, as different types of foodstuffs require different oxygen concentrations, some foodstuffs, such as blueberries, have antioxidant substances such as anthocyanins and VC in the body that are easily oxidized, and therefore require lower oxygen concentrations. Some foodstuffs only need to slightly reduce the oxygen concentration to greatly inhibit their respiration and achieve the purpose of preservation.

[0049] To achieve the differentiated oxygen concentration design of the fresh-keeping chamber 210, in the present application, the fresh-keeping device 100 further comprises a switching member 61, which is used to control the opening and closing of at least one air port 131 and adjust the ratio of the flow areas of the at least two air ports 131.

[0050] When the air port 131 connected to a fresh-keeping chamber 210 is switchable, the oxygen reduction capacity of the fresh-keeping chamber 210 is adjustable. Therefore, when the oxygen concentration required for the foodstuffs to be stored is low, the air port 131 connected to the fresh-keeping chamber 210 can be kept in an open state for a long time, so that the oxygen reduction capacity of the fresh-keeping chamber 210 is enhanced, and the fresh-keeping chamber 210 quickly reaches a low-oxygen state. When the oxygen concentration required for the foodstuffs to be stored is not high, the air port 131 connected to the fresh-keeping chamber 210 can be opened for a certain period of time and then closed, so that the oxygen reduction capacity of the fresh-keeping chamber 210 is weakened, and the fresh-keeping chamber 210 quickly reaches the required oxygen concentration, thereby reducing the oxygen consumption.

[0051] The at least two fresh-keeping chambers 210 share one oxygen enrichment assembly 1, and the number of the oxygen enrichment assembly 1 is reduced, thereby reducing the cost. In the present application, the oxygen enrichment assembly 1 is arranged in such a manner that the at least two fresh-keeping chambers 210 share one oxygen reduction bin 13, and the air in the at least two fresh-keeping chambers 210 is buffered in the oxygen reduction bin 13. At this time, the oxygen reduction bin 13 can be arranged to be relatively large, which is beneficial to the relative stability of the air pressure on both sides of the oxygen enrichment membrane 11, thereby ensuring the stability of the gas permeating through the oxygen enrichment membrane 11 and improving the overall oxygen absorption capacity.

[0052] It can be understood that when the air extraction device 3 is running and the switch member 61 is opened, the air extraction device 3 will suck away the air in at least two fresh-keeping chambers 210. When the air extraction device 3 is running and the switch member 61 is closed, if there is still an air vent 131 in an open state, the air extraction device 3 will suck away the air in the corresponding fresh-keeping chamber 210. In this way, the running of the air extraction device 3 can reduce the air flow between the fresh-keeping chambers 210 through the air vents 131. Therefore, it can be considered that the at least two fresh-keeping chambers 210 are independent of each other, that is, after the refrigerator door is closed and the air extraction device 3 is running, the air in the fresh-keeping chambers 210 does not flow between each other, forming a relatively independent fresh-keeping environment, and avoiding the air in one fresh-keeping chamber 210 from entering another fresh-keeping chamber 210 to affect the fresh-keeping of the food materials therein.

[0053] In the scheme of the present application, the at least two air vents 131 are connected to the at least two fresh-keeping chambers 210, the switch member 61 can control the opening and closing of the at least one air vent 131, and the proportion of the flow areas of the at least two air vents 131 can be adjusted, which can be realized by a plurality of technical schemes.

[0054] For example, the fresh-keeping chambers 210 are two, the areas of the air vents 131 corresponding to the two fresh-keeping chambers 210 are equal. The switch member 61 can only control the opening and closing of one air vent 131, so that the oxygen reduction capability of one fresh-keeping chamber 210 is adjustable, and the oxygen reduction capability of the other fresh-keeping chamber 210 is not adjustable, so that the oxygen reduction capabilities of the two fresh-keeping chambers 210 are different, and fresh-keeping chambers 210 with different oxygen concentrations can be obtained. When the switch member 61 is opened, the proportion of the flow areas of the two air vents 131 is 1:1. When the switch member 61 is closed, the proportion of the flow areas of the two air vents 131 is 1:0.

[0055] For another example, the fresh-keeping chambers 210 are two, the areas of the air vents 131 corresponding to the two fresh-keeping chambers 210 are equal. The switch member 61 is two, and the two switch members 61 each control the opening and closing of one air vent 131. In this way, the oxygen reduction capabilities of the two fresh-keeping chambers 210 are adjustable. Therefore, the oxygen reduction capabilities of the two fresh-keeping chambers 210 are the same, and fresh-keeping chambers 210 with different oxygen concentrations can also be obtained. When the two switch members 61 are opened, the proportion of the flow areas of the two air vents 131 is 1:1. When one switch member 61 is opened and the other switch member 61 is closed, the proportion of the flow areas of the two air vents 131 is 1:0. When the two switch members 61 are closed, the proportion of the flow areas of the two air vents 131 is 0:1.

[0056] For example, the fresh-keeping chamber 210 is two, and the two fresh-keeping chambers 210 correspond to equal areas of the air vents 131. The switch piece 61 can be one or two, and the switch piece 61 can open any one of the two air vents 131, and when one air vent 131 is opened, the other air vent 131 is closed. In this way, the oxygen reduction capacity of the two fresh-keeping chambers 210 can be adjusted, but the oxygen reduction capacity of the two fresh-keeping chambers 210 is different at the same time. In the two cases, the ratio of the flow areas of the two air vents 131 is 1:0 and 0:1.

[0057] In summary, the design of the present application can adjust the oxygen reduction capacity of at least one fresh-keeping chamber 210, and the oxygen concentration of at least two fresh-keeping chambers 210 can be designed differently. The oxygen reduction capacity of the at least two fresh-keeping chambers 210 is different, which realizes the differential design of the oxygen concentration, and is beneficial to the preservation of food materials with different oxygen concentration requirements.

[0058] It should be noted that the oxygen-enriching film 11 is a kind of film material that can enrich oxygen on one side of the film. 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 film, diffusion will occur. From the perspective of molecular polarity, the molecular structure of the film material may contain groups that have affinity for oxygen molecules, so the so-called selective permeation refers to the fact that the oxygen-enriching film 11 preferentially adsorbs and transmits oxygen molecules.

[0059] In the present application, when at least one air vent 131 is opened, the negative pressure generated by the air inlet end of the air extraction device 3 can act on the oxygen-enriching film 11 through the collection cavity 12, and the pressure difference between the two sides drives the gas molecules to permeate through the oxygen-enriching film 11 into the collection cavity 12. When at least one air vent 131 is opened, the oxygen molecules in the fresh-keeping chamber 210 connected to the air vent 131 can continuously selectively permeate through the oxygen-enriching film 11.

[0060] In some embodiments, as shown in Figure 2 and Figure 3 The oxygen-enriching assembly 1 includes a box body 10, the box cavity of the box body 10 constitutes the collection cavity 12, at least one box wall of the box body 10 is the oxygen-enriching film 11, and the box body 10 is located in the oxygen reduction bin 13. In this way, the box body 10 is entirely located in the oxygen reduction bin 13, and the air in the fresh-keeping chamber 210 entering the larger oxygen reduction bin 13 can be buffered, and the gas pressure on the outside of the oxygen-enriching film 11 is relatively relaxed and stable.

[0061] Specifically, the two opposite box walls of the box body 10 are the oxygen-enriching film 11, and the collection cavity 12 is clamped between the two oxygen-enriching films 11, thereby increasing the area of the oxygen-enriching film 11 and increasing the oxygen permeation efficiency. Further, the box body 10 is a flat plate, the two largest box walls of the box body 10 are the oxygen-enriching film 11, and the remaining box walls are support walls. The air extraction pipe 41 is connected to the support wall of the box body 10.

[0062] Further, as shown in Figure 2As shown, the side walls of the box body 10 and the oxygen-reducing chamber 13 are spaced apart. This allows the oxygen-reducing chamber 13 to surround the entire box body 10, forming an annular cavity between the side walls of the box body 10 and the oxygen-reducing chamber 13. This facilitates airflow and promotes uniform air distribution within the oxygen-reducing chamber 13, thereby improving the overall oxygen-reducing capacity.

[0063] Of course, when the box body 10 and the side wall of the oxygen reduction chamber 13 are spaced apart, the box body 10 can be fixed in the oxygen reduction chamber 13 in various ways. For example, the box body 10 can be suspended in the oxygen reduction chamber 13 by a rope, in which case the suction pipe 41 is preferably a flexible hose. Alternatively, the oxygen reduction chamber 13 can be equipped with a support column to fix the box body 10 in place and prevent the box body 10 from shaking or falling.

[0064] In other embodiments, such as Figure 4 As shown, the oxygen-enriching component 1 is box-shaped, with an oxygen-enriching membrane 11 as the middle layer of the box. One side of the oxygen-enriching membrane 11 is a collection chamber 12, and the other side is an oxygen-reducing chamber 13. One side wall of the oxygen-enriching membrane 11 is connected to an air extraction pipe 41, and the opposite side wall is provided with at least two air vents 131.

[0065] Furthermore, such as Figure 2 As shown, the air extraction device 3 is located outside the oxygen reduction chamber 13. The air inlet of the air extraction device 3 is connected to the collection chamber 12 via an air extraction pipe 41, which passes through the side wall of the oxygen reduction chamber 13. This limits the volume of the oxygen reduction chamber 13, allowing the air extraction device 3 to be placed in another space, preventing the oxygen reduction chamber 13 from becoming too large and encroaching on the storage space of the refrigerator 1000. Since the separately placed air extraction device 3 generates some vibration and noise during operation, it can be placed in a location that facilitates noise reduction.

[0066] In some embodiments, such as Figure 2 As shown, at least one of the two vents 131 has a switch 61 installed at it. This makes switch control very convenient.

[0067] In some embodiments, at least two vents 131 share the same switch element 61, while in other embodiments, each vent 131 has a separate switch element 61. This allows for a variety of configurations, providing greater flexibility in product design.

[0068] In some specific embodiments, such as Figure 2 As shown, the switch 61 is a sliding door, and the drive unit of the switch 61 only needs to drive the switch 61 to move in one direction. The switch 61 can be set as a flat plate to avoid occupying too much space.

[0069] exist Figure 2In the example shown, the sliding door moves in one direction and can act as the opening and closing door for a vent 131. When the switch 61 is a sliding door, and two vents 131 are located on the sliding door's movement path, the sliding door can also control the opening and closing of the two vents 131. This also allows adjustment of the flow area ratio of the two vents 131. For example, when the sliding door is at one vent 131 and the other vent 131 is open, the flow area ratio is 1:0. When the sliding door is between two vents 131 and both vents 131 are open, the flow area ratio is 1:1. When the sliding door is at another vent 131 and the first vent 131 is open, the flow area ratio is 0:1.

[0070] In other specific embodiments, such as Figure 5 As shown, the switch 61 is a rotating door, so rotating the switch 61 to different positions can adjust the opening and closing of the corresponding vent 131. Here, the rotating door can control the opening and closing of a single vent 131, or it can control the opening and closing of multiple vents 131. For example, in Figure 5 In the oxygen-reducing chamber 13, multiple ventilation ports 131 are provided on its side wall. A rotating door is rotatably mounted on the side wall of the oxygen-reducing chamber 13. The rotating door includes multiple door opening and closing plates 611, which can be adjusted during rotation to match the number of ventilation ports 131. For example, there are three ventilation ports 131, and the rotating door has three door opening and closing plates 611. Figure 5 The diagram shows the state when all three vents 131 are open. When the revolving door rotates 60 degrees clockwise or counterclockwise, one switch panel 611 engages with vent 131, opening two vents 131. When the revolving door rotates 120 degrees clockwise or counterclockwise, two switch panels 611 engage with vent 131, leaving one vent 131 open. When the revolving door rotates 180 degrees clockwise or counterclockwise, all three switch panels 611 engage with vent 131, closing all three vents 131.

[0071] Of course, the switch 61 can also adopt other structural forms, which are not limited here.

[0072] In some embodiments, the preservation device 100 further includes: vent pipes 62, of which there are at least two vent pipes 62. One end of each vent pipe 62 is connected to the oxygen-reducing chamber 13 to form a vent 131, and the other end of each vent pipe 62 is used to connect to at least one preservation compartment 210. Different preservation compartments 210 are connected to different vent pipes 62. That is, by connecting the oxygen-reducing chamber 13 and the preservation compartment 210 through pipes, it is possible to facilitate the flexible placement of the oxygen-enriching component 1 and avoid the oxygen-enriching component 1 being too close to the preservation compartment 210 and thus encroaching on the volume of the preservation compartment 210. Optionally, the oxygen-enriching component 1 is flat and can be horizontally arranged on the top of the preservation compartment 210. Alternatively, the oxygen-enriching component 1 is flat and sandwiched between two preservation compartments 210, or the oxygen-enriching component 1 is flat and arranged inside the side wall of the refrigerator 1000. Alternatively, the oxygen-enriching component 1 may be arranged in the interlayer of the refrigerator 1000, for example, in the interlayer between the freezer and the refrigerator compartment.

[0073] Specifically, the switch 61 has a flexible position; it can be located on the vent pipe 62 or at the end of the vent pipe 62. For example... Figure 6 As shown, one end of the vent pipe 62 is connected to the fresh food compartment 210, and the switch 61 can be provided on the side wall of the fresh food compartment 210 and is provided corresponding to the end of the vent pipe 62.

[0074] In some embodiments, the preservation device 100 further includes a turbulence fan 7, which is disposed at least at one location in the preservation chamber 210 and the oxygen reduction chamber 13. When the turbulence fan 7 is disposed in the preservation chamber 210, such as... Figure 2 As shown, the turbulence fan 7 can promote uniform gas flow in the freshness compartment 210, and the oxygen content in the freshness compartment 210 is relatively uniform and consistent.

[0075] When the turbulence fan 7 is installed inside the oxygen reduction chamber 13, such as Figure 2 As shown, the turbulence fan 7 can promote uniform gas flow in the oxygen reduction chamber 13, and the oxygen content in the oxygen reduction chamber 13 is relatively uniform and consistent.

[0076] This allows more air to flow through the upstream side of the oxygen-enriching membrane 11, carrying oxygen through the membrane and into the collection chamber 12. This improves oxygen collection efficiency.

[0077] Specifically, there are at least two turbulence fans 7, with one turbulence fan 7 installed at each vent 131. In this way, the airflow direction can be forcibly guided from the vent 131, reducing airflow between different preservation compartments 210.

[0078] 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.

[0079] The basic structural hierarchy includes: surface layer, active separation layer and support layer. The surface layer is the outermost part of the oxygen-enriched 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-enriched membranes 11 is composed of high molecular materials with oxygenophilic groups that can preferentially adsorb oxygen molecules.

[0080] The thickness of the surface layer is very thin, generally in the nanometer to micrometer level. This is to reduce the path length of gas molecule diffusion, so that oxygen molecules can quickly enter the inside of the membrane for subsequent separation process.

[0081] The active separation layer is the core structural part of the oxygen-enriched 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 thickness of the active separation layer is also very thin, generally around a few hundred nanometers, which can ensure a high oxygen permeation flux.

[0082] Located below the active separation layer, the main function is to provide mechanical support for the active separation layer. Because 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.

[0083] The support layer is usually made of porous high molecular materials or inorganic materials, which have high strength and stability. Its pore structure can allow gas to pass through smoothly in the vertical direction, while not causing much resistance to the permeation of oxygen. The thickness of the support layer is relatively thick, generally between tens of microns and hundreds of microns.

[0084] According to the refrigerator 1000 of the embodiment of the utility model, referring to Figure 1 , comprising a box body 200, at least two independent fresh-keeping chambers 210 are arranged in the box body 200. The refrigerator 1000 further comprises the fresh-keeping device 100 for the refrigerator 1000, and the at least two air vents 131 are connected with the at least two fresh-keeping chambers 210.

[0085] In this way, one air extraction device 3 and one oxygen-enriched assembly 1 are connected with at least two oxygen-enriched assemblies 1, so that the single air extraction device 3 and the oxygen-enriched assembly 1 can realize the scheme of efficiently reducing oxygen in the at least two fresh-keeping chambers 210. The number of air extraction devices 3 and oxygen-enriched assemblies 1 is reduced, thereby reducing the cost.

[0086] 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 an air extraction device 3 is also arranged at this position, so that the vibration source is concentrated at the bottom and is dissipated through conduction to the ground.

[0087] Other structures of the refrigerator 1000 according to the present application, such as the compressor, are all prior art, and will not be described here.

[0088] 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.

[0089] 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: an oxygen enrichment assembly, which comprises an oxygen enrichment membrane, a collection cavity and an oxygen reduction bin, opposite sides of the oxygen enrichment membrane being the collection cavity and the oxygen reduction bin, the oxygen enrichment assembly being used for making oxygen in the oxygen reduction bin more permeate the oxygen enrichment membrane and enter the collection cavity relative to nitrogen, the oxygen reduction bin having at least two air vents, and the at least two air vents being used for communicating the at least two fresh-keeping chambers; an air extraction device, an air inlet end of the air extraction device being communicated with the collection cavity of the oxygen enrichment assembly to suck gas in the collection cavity into the air extraction device; a switch element, which is used for controlling opening and closing of the at least one air vent and adjusting a ratio of flow areas of the at least two air vents.

2. The freshness keeping device for a refrigerator according to claim 1, characterized by The oxygen enrichment assembly comprises a box body, a box cavity of the box body constituting the collection cavity, and at least one box wall of the box body being the oxygen enrichment membrane, and the box body being located in the oxygen reduction bin.

3. The freshness keeping apparatus for a refrigerator according to claim 2, characterized by The box body is arranged in a spaced manner with a side wall of the oxygen reduction bin.

4. The freshness keeping apparatus for a refrigerator according to claim 2, characterized by The air extraction device is located outside the oxygen reduction bin, the air inlet end of the air extraction device is connected with the collection cavity through an air extraction pipe, and the air extraction pipe is arranged through a side wall of the oxygen reduction bin.

5. The freshness keeping device for a refrigerator according to claim 1, characterized by The at least two air vents share the same switch element; or each air vent is provided with a separate switch element.

6. The freshness keeping device for a refrigerator according to claim 1, characterized by The switch element is a sliding door or a rotating door.

7. The freshness keeping device for a refrigerator according to claim 1, characterized by Further comprising: air vents, which are at least two, one end of each air vent being communicated with the oxygen reduction bin to constitute the air vent, and the other end of each air vent being used for communicating at least one fresh-keeping chamber, different fresh-keeping chambers being communicated by different air vents; the switch element is arranged on the air vent or at an end of the air vent.

8. The freshness keeping apparatus for a refrigerator according to any one of claims 1-7, characterized in that, Further comprising: turbulence fans, which are arranged at least one of the fresh-keeping chambers and the oxygen reduction bin.

9. The freshness keeping apparatus for a refrigerator according to claim 8, characterized by The turbulence fans are at least two, and each air vent is provided with the turbulence fan.

10. A refrigerator comprising a cabinet, characterized by The box body has 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 the at least two air vents communicate the at least two fresh-keeping chambers.

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