Air adjusting structure, fresh-keeping device and refrigerator

Abstract

The utility model provides an air adjusting structure, a fresh-keeping device and a refrigerator. The air-conditioning structure comprises a basic air-conditioning film and an air-conditioning channel which is communicated with the cavity to be subjected to air conditioning through the basic air-conditioning film, the air-conditioning structure comprises at least one auxiliary air-conditioning film, and the air-conditioning channel is divided into at least two air-conditioning sub-spaces which are communicated in sequence through the at least one auxiliary air-conditioning film; and when the cavity to be subjected to air adjustment is exhausted, air sequentially passes through the at least two air adjustment sub-spaces and then is exhausted. According to the controlled atmosphere structure, the fresh-keeping device and the refrigerator provided with the fresh-keeping device, on the premise that the performance of a vacuum pump and the pressure resistance of the structure do not need to be improved, the oxygen reduction efficiency can be improved, the oxygen reduction time can be shortened, and large negative pressure cannot be formed in the interior, so that the oxygen reduction efficiency is better improved, and the fresh-keeping effect is better ensured.

Description

Technical Field

[0001] The present disclosure relates to the technical field of refrigerators, and particularly to a gas regulation structure, a fresh-keeping device and a refrigerator. Background Art

[0002] Temperature, humidity and gas environment components are the main factors affecting food preservation. Therefore, controlled atmosphere (CA) preservation is an effective preservation technology. For example, fruits and vegetables are still living organisms during post-harvest storage and are undergoing a series of physiological and metabolic reactions such as respiration and transpiration. A decrease in oxygen concentration can effectively inhibit the respiration and oxidation reactions of fruits and vegetables, thereby reducing nutrient loss, delaying the aging and spoilage of food materials, achieving the purpose of extending the fresh-keeping period of food materials and maintaining the edible quality.

[0003] In related technologies, the CA preservation technology applied to refrigerators uses an air extraction device and a gas separation membrane (also called a CA membrane) to adjust the content of air components in a closed space. The main components of air are nitrogen (78.0%) and oxygen (20.9%), and their molecular sizes are 0.364 nm and 0.346 nm respectively, that is, the molecules of nitrogen are larger than those of oxygen. The gas separation membrane is a polymer or fiber material with micropores. The rates of oxygen and nitrogen passing through the gas separation membrane are different. Under certain pressure conditions, more oxygen passes through, so as to achieve the purpose of reducing the oxygen content in the closed space. Although the extracted gas is oxygen-rich gas, it still contains a part of nitrogen. Therefore, if the closed state is maintained during the oxygen reduction process, as the oxygen-rich gas in the internal space is extracted, the air pressure in the internal space will gradually decrease. If a very low oxygen concentration is to be achieved, a large amount of gas must be extracted, which requires a vacuum pump with a higher vacuum degree and a pressure-resistant structure, resulting in increased costs, complex structures and decreased reliability.

[0004] In some related technologies, in order to enable the wall surface of the fresh-keeping cavity to withstand a large pressure, high-strength materials and structures need to be used to avoid cavity deformation, such as using plastics or metals added with glass fiber, increasing the wall thickness or reinforcing ribs, etc. This results in a complex structure of the fresh-keeping drawer and high manufacturing costs. Moreover, due to the limitation of the strength of existing materials, the internal negative pressure can basically only be reduced to 0.8 - 0.9 atm and the oxygen concentration can be reduced to about 15%. The low-pressure environment will accelerate the water loss of leafy fruits and vegetables, and it is difficult to reach the oxygen concentration (5% - 10%) most suitable for fruit and vegetable preservation.

[0005] In some related technologies, when the pressure difference between the air pressure in the fresh-keeping space and the air pressure in the external space is greater than a predetermined threshold value, the gas in the external space enters the fresh-keeping space through the one-way valve assembly, so as to achieve the pressure balance between the internal and external spaces. However, this method is equivalent to injecting high-concentration oxygen (20.9%) from the external space into the fresh-keeping space, increasing the oxygen concentration inside the fresh-keeping space, thus resulting in a decrease in the oxygen reduction efficiency. The time to reach the most suitable oxygen concentration (5% - 10%) for fruit and vegetable fresh-keeping is greatly extended. Once the oxygen reduction time exceeds 2 hours, it is possible that the user opens the drawer halfway, causing all previous efforts in oxygen reduction to be wasted. Moreover, the long-term operation of the vacuum pump will generate a large amount of heat, noise and vibration. Utility Model Content

[0006] In view of this, in order to solve the technical problems of poor use effect and experience in controlled atmosphere fresh-keeping in the prior art, the present disclosure provides a controlled atmosphere structure, a fresh-keeping device and a refrigerator.

[0007] According to the first aspect of the embodiments of the present disclosure, a controlled atmosphere structure is provided, the controlled atmosphere structure includes a basic controlled atmosphere film, and a controlled atmosphere channel communicated with the cavity to be controlled through the basic controlled atmosphere film,

[0008] The controlled atmosphere structure includes at least one auxiliary controlled atmosphere film, and at least two controlled atmosphere sub-spaces that are sequentially communicated are separated from the controlled atmosphere channel through at least one auxiliary controlled atmosphere film;

[0009] Wherein, when exhausting the cavity to be controlled, the gas is discharged after passing through at least two controlled atmosphere sub-spaces in sequence.

[0010] In an optional embodiment, the controlled atmosphere structure includes a trough-shaped frame, and the open end of the trough-shaped frame abuts against the cavity wall used to form the cavity to be controlled, so that the trough-shaped frame and the cavity wall enclose the controlled atmosphere channel.

[0011] In an optional embodiment, the trough-shaped frame includes a bottom wall, a first basic side wall and a second basic side wall, the bottom wall is arranged opposite to the cavity wall, the second basic side wall is constructed as a concave structure, and the open end of the second basic side wall abuts against the first basic side wall;

[0012] The second basic side wall includes a hollow structure, and the basic controlled atmosphere film is attached to the air inlet side of the second basic side wall.

[0013] In an optional embodiment, the controlled atmosphere structure includes at least one auxiliary side wall, and at least one auxiliary side wall corresponds to at least one auxiliary controlled atmosphere film one by one;

[0014] The auxiliary side wall is configured as a concave structure. The auxiliary side wall is located within the trough-shaped frame, and the open end of the auxiliary side wall abuts against the first base side wall. In the gas discharge direction in the gas conditioning channel, the second base side wall, at least one of the auxiliary side walls, and the first base side wall are arranged in sequence to form at least two gas conditioning sub-spaces arranged in sequence.

[0015] The auxiliary side wall includes a hollow structure. Among the mutually corresponding auxiliary side wall and the auxiliary gas conditioning film, the auxiliary gas conditioning film is attached to the air inlet side of the auxiliary side wall.

[0016] In an optional embodiment, the part of the first base side wall that forms the end gas conditioning sub-space is provided with ventilation holes for discharging the gas in the end gas conditioning sub-space.

[0017] Wherein, in the gas discharge direction in the gas conditioning channel, the end gas conditioning sub-space is the gas conditioning sub-space among at least two gas conditioning sub-spaces that is far from the cavity to be gas conditioned.

[0018] In an optional embodiment, in the gas discharge direction in the gas conditioning channel, among at least two gas conditioning sub-spaces, the volume of the upstream gas conditioning sub-space is larger than the volume of the downstream gas conditioning sub-space.

[0019] According to a second aspect of the embodiments of the present disclosure, a fresh-keeping device is provided. The fresh-keeping device includes an exhaust assembly and the gas conditioning structure according to any one of the first aspect.

[0020] In the gas discharge direction in the gas conditioning structure, the gas conditioning sub-space among at least two gas conditioning sub-spaces that is far from the cavity to be gas conditioned is communicated with the exhaust assembly.

[0021] In an optional embodiment, the fresh-keeping device includes an oxygen concentration detection unit and a gas pressure detection unit. The oxygen concentration detection unit is used to detect the oxygen concentration in the cavity to be gas conditioned, and the gas pressure detection unit is used to detect the gas pressure in the cavity to be gas conditioned.

[0022] In an optional embodiment, the fresh-keeping device includes a cavity part and a drawer part. The opening side of the drawer part faces the cavity wall at the top of the cavity part.

[0023] When the drawer part and the cavity part are in a closed state, the drawer part and the cavity part form the sealed cavity to be gas conditioned.

[0024] Wherein, when the gas conditioning structure includes a trough-shaped frame, the open end of the trough-shaped frame abuts against the cavity wall at the top of the cavity part, so that the trough-shaped frame and the cavity wall enclose the gas conditioning channel.

[0025] According to a third aspect of the embodiments of the present disclosure, there is provided a refrigerator, which includes the preservation device according to any one of the second aspect.

[0026] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: The controlled atmosphere structure of the present disclosure includes a basic controlled atmosphere film and a controlled atmosphere channel, and the controlled atmosphere channel communicated with the cavity to be controlled by the basic controlled atmosphere film. Moreover, the controlled atmosphere structure further includes at least one auxiliary controlled atmosphere film, and the controlled atmosphere channel is divided into at least two sequentially communicated controlled atmosphere sub-spaces by the at least one auxiliary controlled atmosphere film. In this controlled atmosphere structure, when exhausting the cavity to be controlled, the gas is discharged after passing through at least two controlled atmosphere sub-spaces in sequence. That is to say, in the present disclosure, the gas in the cavity to be controlled is discharged after being filtered by multiple controlled atmosphere films in sequence, which can increase the oxygen concentration of the gas extracted from the cavity to be controlled, thereby reducing the volume of the extracted gas, maintaining a relatively small negative pressure and a relatively low oxygen concentration inside the cavity to be controlled, improving the oxygen reduction efficiency and preservation effect, and not requiring the introduction of gas from the external space into the cavity to be controlled to achieve pressure balance between the internal and external spaces, nor requiring a high-performance vacuum pump and a pressure-resistant structure, and the application cost is low. That is, for the preservation device provided with the controlled atmosphere structure of the present disclosure, and the refrigerator provided with the above-mentioned preservation device, it is possible to improve the oxygen reduction efficiency, shorten the oxygen reduction time, and not form a relatively large negative pressure inside without the need to improve the performance of the vacuum pump and the pressure resistance performance of the structure, thereby better improving the oxygen reduction efficiency and better ensuring the preservation effect.

[0027] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present disclosure and used together with the specification to explain the principles of the present disclosure.

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] One or more embodiments are illustrated by way of example in the corresponding drawings in the accompanying drawings, and these exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the accompanying drawings do not constitute a scale limitation.

[0031] Figure 1 is a schematic diagram of a controlled atmosphere structure shown according to an exemplary embodiment.

[0032] Figure 2 is a schematic diagram of a fresh-keeping device shown according to an exemplary embodiment.

[0033] Figure 3 is a cross-sectional view of a fresh-keeping device shown according to an exemplary embodiment.

[0034] Figure 4 is a schematic diagram of a fresh-keeping device in a closed state shown according to an exemplary embodiment.

[0035] Figure 5 is an exploded schematic diagram of a fresh-keeping device shown according to an exemplary embodiment.

[0036] Reference numerals:

[0037] 11, gas conditioning structure; 111, trough-shaped frame; 1111, first base side wall; 1112, second base side wall; 1113, bottom wall; 112, auxiliary side wall; 112a, first auxiliary side wall; 112b, second auxiliary side wall; 113, base gas conditioning film; 114, auxiliary gas conditioning film; 114a, first auxiliary gas conditioning film; 114b, second auxiliary gas conditioning film; 115, ventilation hole; 12, cavity part; 13, drawer part; 14, exhaust assembly; 141, exhaust pipe; 142, exhaust control valve; 143, exhaust pump; 15, sealing structure;

[0038] 10, cavity to be gas-conditioned; 20, gas conditioning channel; 201, first gas conditioning sub-space; 202, second gas conditioning sub-space; 203, third gas conditioning sub-space. Detailed implementation manners

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0040] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention. To simplify the disclosure of the present invention, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0041] For ease of description, spatial relative relationship terms may be used in the text to describe the relative positional relationship or movement of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms are, for example, "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", "front", "rear", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation other than the orientations depicted in the figure. For example, if the device in the figure undergoes a position flip, attitude change, or motion state change, then these directional indications will change accordingly. For example, an element described as "below other elements or features" or "beneath other elements or features" will subsequently be oriented as "above other elements or features" or "over other elements or features". Therefore, the exemplary term "below" can include both the upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0042] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner. Therefore, only the components related to the present application are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0043] The embodiments of the present application will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application and not for limiting the protection scope of the present application.

[0044] To solve the technical problem of the poor use effect and experience of controlled atmosphere preservation in the prior art, the present disclosure provides a controlled atmosphere structure, a preservation device, and a refrigerator.

[0045] Among them, the controlled atmosphere structure of the present disclosure includes a basic controlled atmosphere film and a controlled atmosphere channel, and the controlled atmosphere channel communicates with the cavity to be controlled through the basic controlled atmosphere film. Moreover, the controlled atmosphere structure further includes at least one auxiliary controlled atmosphere film, and the controlled atmosphere channel is divided into at least two sequentially connected controlled atmosphere sub-spaces by at least one auxiliary controlled atmosphere film. In this controlled atmosphere structure, when exhausting the cavity to be controlled, the gas is discharged after passing through at least two controlled atmosphere sub-spaces in sequence. That is to say, in the present disclosure, the gas in the cavity to be controlled is discharged after passing through the filtration of multiple controlled atmosphere films, which can increase the oxygen concentration of the gas extracted from the cavity to be controlled, thereby reducing the volume of the extracted gas, maintaining a relatively small negative pressure and a relatively low oxygen concentration inside the cavity to be controlled, improving the oxygen reduction efficiency and the fresh-keeping effect, and without the need to introduce the gas in the external space into the cavity to be controlled to achieve the pressure balance between the internal and external spaces, nor the need for a high-performance vacuum pump and a pressure-resistant structure, and the application cost is low. That is, for a fresh-keeping device provided with the controlled atmosphere structure of the present disclosure, and a refrigerator provided with the above fresh-keeping device, without the need to improve the performance of the vacuum pump and the pressure-resistant performance of the structure, the oxygen reduction efficiency can be improved, the oxygen reduction time can be shortened, and a relatively large negative pressure will not be formed inside, so as to better improve the oxygen reduction efficiency and better ensure the fresh-keeping effect.

[0046] Reference Figures 1 to 5 As shown, in an exemplary embodiment, a controlled atmosphere structure 11 and a fresh-keeping device provided with the controlled atmosphere structure 11 are provided.

[0047] Among them, the fresh-keeping device may include a cavity 10 to be controlled. The controlled atmosphere structure 11 may include a basic controlled atmosphere film 113 and a controlled atmosphere channel 20. The controlled atmosphere channel 20 may communicate with the cavity 10 to be controlled through the above basic controlled atmosphere film 113, so as to discharge the gas in the cavity 10 to be controlled through the basic controlled atmosphere film 113 and the controlled atmosphere channel 20.

[0048] Among them, the controlled atmosphere structure 11 may include at least one auxiliary controlled atmosphere film 114. The controlled atmosphere channel 20 may include at least two sequentially connected controlled atmosphere sub-spaces. And, in this controlled atmosphere structure 11, the controlled atmosphere channel 20 is divided into the above at least two sequentially connected controlled atmosphere sub-spaces by the above at least one auxiliary controlled atmosphere film 114. When exhausting the cavity 10 to be controlled, the gas is discharged after passing through at least two controlled atmosphere sub-spaces in sequence.

[0049] In some embodiments (not shown in the figure),

[0050] the controlled atmosphere structure includes an auxiliary controlled atmosphere film. The controlled atmosphere structure divides the controlled atmosphere channel into two mutually connected controlled atmosphere sub-spaces through an auxiliary controlled atmosphere film. Among them, the first controlled atmosphere sub-space communicates with the cavity to be controlled through the basic controlled atmosphere film, and the first controlled atmosphere sub-space communicates with the second controlled atmosphere sub-space through the above auxiliary controlled atmosphere film. Thus, the first controlled atmosphere sub-space and the second controlled atmosphere sub-space constitute the controlled atmosphere channel.

[0051] In this embodiment, the gas in the controlled atmosphere chamber first enters the first sub-controlled atmosphere space through the basic controlled atmosphere film, then enters the second sub-controlled atmosphere space through the auxiliary controlled atmosphere film, and then is discharged.

[0052] In some embodiments,

[0053] Referring to Figures 1 to 5 As shown, the controlled atmosphere structure 11 includes two auxiliary controlled atmosphere films 114, denoted as the first auxiliary controlled atmosphere film 114a and the second auxiliary controlled atmosphere film 114b respectively. In this controlled atmosphere structure 11, the controlled atmosphere channel 20 is divided into three sequentially connected sub-controlled atmosphere spaces by the above two auxiliary controlled atmosphere films 114. Among them, the first sub-controlled atmosphere space 201 is connected to the controlled atmosphere chamber 10 through the basic controlled atmosphere film 113, the second sub-controlled atmosphere space 202 is connected to the first sub-controlled atmosphere space 201 through the first auxiliary controlled atmosphere film 114a, and the third sub-controlled atmosphere space 203 is connected to the second sub-controlled atmosphere space 202 through the second auxiliary controlled atmosphere film 114b. Thus, the first sub-controlled atmosphere space 201, the second sub-controlled atmosphere space 202 and the third sub-controlled atmosphere space 203 can form the controlled atmosphere channel 20.

[0054] In this embodiment, the gas in the controlled atmosphere chamber 10 first enters the first sub-controlled atmosphere space 201 through the basic controlled atmosphere film 113, then enters the second sub-controlled atmosphere space 202 through the first auxiliary controlled atmosphere film 114a, then enters the third sub-controlled atmosphere space 203 through the second auxiliary controlled atmosphere film 114b, and then is discharged.

[0055] It should be noted that the controlled atmosphere structure 11 can be other structures in addition to the structure of the above embodiment, and no limitation is made thereto.

[0056] Among them, the preservation device may include an exhaust assembly 14. The exhaust assembly 14 includes, for example, an exhaust pipeline 141, an exhaust control valve 142, an exhaust pump 143, and so on. The exhaust control valve 142 can be a gas solenoid valve or other control valves, and no limitation is made thereto. The exhaust pump 143 can be a vacuum pump.

[0057] Among them, in the discharging direction of the gas in the controlled atmosphere structure 11, at least two sub-controlled atmosphere spaces away from the controlled atmosphere chamber 10 are connected to the exhaust assembly 14.

[0058] For example (not shown in the figure), when the controlled atmosphere structure includes an auxiliary controlled atmosphere film, the exhaust pipeline in the exhaust assembly can be connected to the second sub-controlled atmosphere space. When controlled atmosphere is required, the exhaust control valve can be set to the open state and the exhaust pump can be started. In this case, the gas in the controlled atmosphere chamber first enters the first sub-controlled atmosphere space through the basic controlled atmosphere film, then enters the second sub-controlled atmosphere space through the auxiliary controlled atmosphere film, and then is discharged through the exhaust pipeline.

[0059] For another example, referring toFigures 1 to 5 As shown, when the controlled atmosphere structure 11 includes two auxiliary controlled atmosphere films 114, the exhaust pipe 141 in the exhaust assembly 14 can communicate with the third controlled atmosphere sub-space 203. When controlled atmosphere is required, the exhaust control valve 142 can be set to the open state and the exhaust pump 143 can be started. In this case, the gas in the controlled atmosphere cavity 10 first enters the first controlled atmosphere sub-space 201 through the basic controlled atmosphere film 113, then enters the second controlled atmosphere sub-space 202 through the first auxiliary controlled atmosphere film 114a, then enters the third controlled atmosphere sub-space 203 through the second auxiliary controlled atmosphere film 114b, and then is discharged through the exhaust pipe 141.

[0060] It should be noted that the preservation device can be of other configurations in addition to the above-described configuration, and no limitation is imposed thereon.

[0061] In this embodiment, the gas in the controlled atmosphere cavity 10 is discharged after being filtered through multiple controlled atmosphere films, which can increase the oxygen concentration of the gas extracted from the controlled atmosphere cavity 10, thereby reducing the volume of the extracted gas, maintaining a relatively small negative pressure and a relatively low oxygen concentration inside the controlled atmosphere cavity 10, improving the oxygen reduction efficiency and preservation effect, and without the need to introduce gas from the external space into the controlled atmosphere cavity 10 to achieve pressure balance between the internal and external spaces, nor the need for a high-performance vacuum pump and a pressure-resistant structure, and the application cost is low. That is, for the preservation device provided with the controlled atmosphere structure 11 in this embodiment, and for the refrigerator provided with the above-described preservation device, the oxygen reduction efficiency can be improved and the oxygen reduction time can be shortened without the need to improve the performance of the vacuum pump and the pressure resistance of the structure, and no large negative pressure will be formed inside, so as to better improve the oxygen reduction efficiency and better ensure the preservation effect.

[0062] In an exemplary embodiment, referring to Figures 1 to 5 As shown, a controlled atmosphere structure 11 and a preservation device provided with the controlled atmosphere structure 11 are provided. Among them, the controlled atmosphere structure 11 can include a trough-shaped frame 111. The trough-shaped frame 111 can be a plastic frame, a metal frame, or a frame made of other materials, and no limitation is imposed thereon.

[0063] Among them, the open end of the trough-shaped frame 111 abuts against the cavity wall for forming the controlled atmosphere cavity 10, so that the trough-shaped frame 111 and the cavity wall enclose a controlled atmosphere channel 20.

[0064] Among them, the freshness preservation device can be a freshness preservation drawer, and the freshness preservation drawer may include a cavity portion 12 and a drawer portion 13. The opening side of the drawer portion 13 faces the cavity wall at the top of the cavity portion 12. When the drawer portion 13 and the cavity portion 12 are in a closed state, the drawer portion 13 and the cavity portion 12 form a sealed cavity to be gas-adjusted 10. And, the cavity wall at the top of the cavity portion 12 constitutes the cavity wall at the top of the cavity to be gas-adjusted 10. The open end of the trough-shaped frame 111 abuts against the cavity wall at the top of the cavity portion 12, so that the trough-shaped frame 111 and the cavity wall enclose an air-conditioning channel 20. In this way, the structure of the freshness preservation drawer can be utilized more reasonably, which can not only ensure the normal use of the freshness preservation drawer, but also realize the air-conditioning channel 20.

[0065] It should be noted that the air-conditioning structure 11 can be set as other shapes in addition to the trough-shaped frame 111.

[0066] In some embodiments (not shown in the figure),

[0067] The frame of the air-conditioning structure can be provided with a frame having two open ends. Among them, the first open end faces the cavity wall at the top of the cavity portion (which can be denoted as the first cavity wall), and the second open end faces the candidate cavity wall of the cavity portion (which can be denoted as the second cavity wall). The drawer portion is inserted through the open end of the cavity portion, and the insertion direction of the drawer portion can be denoted as being inserted from front to back, and the rear part is the side of the cavity portion away from its open end. In this embodiment, the first open end of the frame abuts against the first cavity wall of the cavity portion, and the second open end abuts against the second cavity wall of the cavity portion. Reasonably using the two cavity walls of the cavity portion and the frame with two open ends to enclose an air-conditioning channel can better save materials and reduce costs.

[0068] Among them, referring to Figures 1 to 5 As shown, when the air-conditioning structure 11 includes a trough-shaped frame 111, the trough-shaped frame 111 may include a bottom wall 1113, a first basic side wall 1111, and a second basic side wall 1112. The bottom wall 1113 is disposed opposite to the above-mentioned cavity wall. The first basic side wall 1111 can be constructed as a plate-like structure, and the second basic side wall 1112 can be constructed as a concave structure. The open end of the second basic side wall 1112 abuts against the first basic side wall 1111. In this way, the trough-shaped frame 111 can be enclosed by the bottom wall 1113, the first basic side wall 1111, and the second basic side wall 1112.

[0069] It should be noted that the concave structure can be a C-shaped structure, a U-shaped structure, or other concave structures, and there is no limitation on this. As long as the first basic side wall 1111 and the second basic side wall 1112 can enclose a certain space.

[0070] Among them, the edge position of the open end of the trough-shaped frame 111 may be provided with side edges fixedly connected to the cavity wall, so as to facilitate the fixed and sealed connection between the trough-shaped frame 111 and the cavity wall.

[0071] Among them, the second basic side wall 1112 may include a hollow structure, and the basic gas conditioning film 113 may be attached to the air inlet side of the second basic side wall 1112. In this way, both the fixation of the basic gas conditioning film 113 can be realized, and the gas in the cavity 10 to be gas-conditioned can enter the gas conditioning channel 20 through the basic gas conditioning film 113.

[0072] Among them, the basic gas conditioning film 113 may cover the hollow structure, so as to ensure that the gas in the cavity 10 to be gas-conditioned needs to pass through the basic gas conditioning film 113 before entering the gas conditioning channel 20.

[0073] Among them, the second basic side wall 1112 may be entirely constructed as a hollow structure or partially constructed as a hollow structure, and there is no limitation on this. In order to ensure that the gas in the cavity 10 to be gas-conditioned can more easily enter the gas conditioning channel 20 through the basic gas conditioning film 113, the second basic side wall 1112 may be entirely set as a hollow structure.

[0074] Among them, the first basic side wall 1111 may be constructed as a non-hollow plate-like structure and may be fixedly connected to the cavity wall at the rear of the cavity part 12 (not shown in the figure) to ensure the stable installation of the trough-shaped frame. Of course, the first basic side wall 1111 may also be spaced from the cavity wall at the rear of the cavity part 12 (refer to Figure 2 and Figure 3 as shown), so as to facilitate the trough-shaped frame to be arranged at the middle position on the top of the cavity 10 to be gas-conditioned, so as to better realize the gas conditioning effect.

[0075] It should be noted that the fixed connection method in this embodiment may adopt adhesive connection, welding connection or fastener connection, etc. according to the actual situation, and there is no limitation on this.

[0076] Among them, in order to ensure the stable installation of the auxiliary gas conditioning film 114, the gas conditioning structure 11 may include at least one auxiliary side wall 112. And at least one auxiliary side wall 112 corresponds to at least one auxiliary gas conditioning film 114 one by one to ensure the stable installation of the corresponding auxiliary gas conditioning film 114.

[0077] Among them, the shape of the auxiliary side wall 112 can be the same as that of the second basic side wall 1112 to ensure the smooth flow of gas in the modified atmosphere channel 20. That is to say, when the second basic side wall 1112 is configured as a concave structure, the auxiliary side wall 112 can also be configured as a concave structure. The auxiliary side wall 112 can be located within the trough-shaped frame, and the open end of the auxiliary side wall 112 abuts against the first basic side wall 1111. In addition, the top of the auxiliary side wall 112 abuts against the cavity wall at the top of the cavity portion 12. Thus, the modified atmosphere channel 20 can be divided into at least two modified atmosphere sub-spaces.

[0078] Among them, in the gas discharge direction in the modified atmosphere channel 20, the second basic side wall 1112, at least one auxiliary side wall 112, and the first basic side wall 1111 are arranged in sequence to form at least two sequentially arranged modified atmosphere sub-spaces. The auxiliary side wall 112 can also include a hollow structure. Among the mutually corresponding auxiliary side wall 112 and the auxiliary modified atmosphere film 114, the auxiliary modified atmosphere film 114 is attached to the intake side of the auxiliary side wall 112 to ensure the reliable installation of the auxiliary modified atmosphere film 114 and the corresponding auxiliary side wall 112. In this way, the gas in the modified atmosphere cavity 10 can sequentially pass through the corresponding modified atmosphere film into the corresponding modified atmosphere sub-space and then be discharged.

[0079] Among them, the part of the first basic side wall 1111 that forms the end modified atmosphere sub-space is provided with a ventilation hole 115 for discharging the gas in the end modified atmosphere sub-space. In the gas discharge direction in the modified atmosphere channel 20, the end modified atmosphere sub-space is the modified atmosphere sub-space that is far from the modified atmosphere cavity 10 among the at least two modified atmosphere sub-spaces.

[0080] In some embodiments,

[0081] Referring to Figures 1 to 5 as shown, the fresh-keeping device can be a fresh-keeping drawer, and the fresh-keeping drawer can include a drawer portion 13 and a cavity portion 12. An opening is provided at the front end of the cavity portion 12, and horizontal guide rails are provided on the left and right sides inside the cavity portion 12, so that the drawer portion 13 can be inserted into the cavity portion 12 from the open end of the cavity portion 12, thereby realizing the closing and opening of the fresh-keeping drawer.

[0082] In this embodiment, a sealing structure 15 (such as a gasket) is provided at the joint between the drawer part 13 and the cavity part 12, so as to ensure that a closed space, that is, a closed controlled atmosphere cavity, is formed inside the cavity part 12 after the fresh-keeping drawer is closed. An air vent 115 is provided on the cavity wall at the rear of the cavity part 12, and a controlled atmosphere structure 11 is provided at the top inside the controlled atmosphere cavity 10. The controlled atmosphere structure 11 is mainly composed of a trough-shaped frame 111 and a plurality of controlled atmosphere membranes. The trough-shaped frame 111 can be made of plastic. Two layers of auxiliary side walls 112 are provided inside the trough-shaped frame 111, and the auxiliary side walls 112 are configured as C-shaped structures. The trough-shaped frame 111 may include a first basic side wall 1111 and a second basic side wall 1112, and the second basic side wall 1112 is also configured as a C-shaped structure. The above two auxiliary side walls 112 are the second auxiliary side wall 112b112 and the first auxiliary side wall 112a112 in sequence from the back to the front.

[0083] In this embodiment, a hollow structure is provided on the two auxiliary side walls 112 and the second basic side wall 1112. The first basic side wall 1111 is not provided with a hollow structure, but it is provided with an air vent 115. The air vent 115 is used to connect to an exhaust pipe 141 to realize exhaust during the controlled atmosphere process.

[0084] Among them, the controlled atmosphere membrane is a gas separation membrane, generally a polymer or fiber material with micropores. The rates of oxygen and nitrogen passing through the gas separation membrane are different, and more oxygen passes through under certain pressure conditions. A controlled atmosphere membrane is pasted on the intake side of each hollow structure. The intake side can be the front side of the hollow structure. In the controlled atmosphere structure 11, the controlled atmosphere membranes from the back to the front are the second auxiliary controlled atmosphere membrane 114b, the first auxiliary controlled atmosphere membrane 114a, and the basic controlled atmosphere membrane 113. In the direction of gas discharge in the controlled atmosphere channel 20, in at least two controlled atmosphere sub-spaces, the volume of the upstream controlled atmosphere sub-space is larger than that of the downstream controlled atmosphere sub-space. In this way, the amount of gas entering the controlled atmosphere sub-space through the controlled atmosphere membrane can correspond to the volume of the controlled atmosphere sub-space, making the overall structural layout more reasonable and better realizing gas discharge.

[0085] In this embodiment, the fresh-keeping device may further include a gas solenoid valve and a vacuum pump located outside the controlled atmosphere cavity. Among them, the air vent 115 of the controlled atmosphere structure 11 and the gas solenoid valve of the fresh-keeping device are connected through an exhaust pipe 141, and the gas solenoid valve and the vacuum pump are also connected through an exhaust pipe 141.

[0086] In this embodiment, after the user closes the fresh-keeping drawer, the interior of the fresh-keeping drawer forms a closed space. When it is necessary to perform controlled atmosphere fresh-keeping on the fresh-keeping drawer, under the action of a vacuum pump, the air inside the controlled atmosphere cavity 10 passes through the basic controlled atmosphere film 113 and enters the first controlled atmosphere sub-space 201 on the outermost layer of the controlled atmosphere channel 20. Although the entering air is oxygen-rich gas, it still contains a part of nitrogen. Subsequently, this part of the gas enters the middle-layer second controlled atmosphere sub-space 202 through the first auxiliary controlled atmosphere film 114a. After further filtration, oxygen enters the second controlled atmosphere sub-space 202, while most of the nitrogen is blocked, so that the oxygen is further enriched and the concentration is increased. Finally, this part of the gas enters the innermost third controlled atmosphere sub-space 203 through the second auxiliary controlled atmosphere film 114b. The oxygen concentration is further enriched, blocking most of the nitrogen, and finally discharged through the ventilation hole 115 and the exhaust pipeline 141, etc., so as to realize the controlled atmosphere fresh-keeping of the items in the fresh-keeping drawer.

[0087] It should be noted that the fresh-keeping device can be other types of fresh-keeping devices in addition to the fresh-keeping drawer, and no limitation is made thereto.

[0088] In this embodiment, the gas in the controlled atmosphere cavity 10 is discharged after being filtered by multiple controlled atmosphere films in sequence, which can increase the oxygen concentration of the gas extracted from the controlled atmosphere cavity 10, thereby reducing the volume of the extracted gas, maintaining a relatively small negative pressure and a relatively low oxygen concentration inside the controlled atmosphere cavity 10, improving the oxygen reduction efficiency and fresh-keeping effect, and not requiring the gas in the external space to be introduced into the controlled atmosphere cavity 10 to achieve pressure balance between the internal and external spaces, nor requiring a high-performance vacuum pump and a pressure-resistant structure, and the application cost is low. That is, the controlled atmosphere structure 11 and the fresh-keeping device of this embodiment can improve the oxygen reduction efficiency and shorten the oxygen reduction time without improving the performance of the vacuum pump and the pressure resistance of the structure, and will not form a large negative pressure inside, so as to better improve the oxygen reduction efficiency and better ensure the fresh-keeping effect.

[0089] In an exemplary embodiment, a fresh-keeping device and a controlled atmosphere fresh-keeping method are provided. Refer to Figures 1 to 5 As shown, the fresh-keeping device may include the controlled atmosphere structure 11 of the above embodiment.

[0090] When the controlled atmosphere cavity 10 of the fresh-keeping device is in a closed state, the real-time oxygen concentration and real-time gas pressure inside the controlled atmosphere cavity 10 can be detected. It should be noted that when the fresh-keeping device is a fresh-keeping drawer, when the fresh-keeping drawer is in a closed state, it is considered that the controlled atmosphere cavity 10 is in a closed state. Therefore, it is possible to determine whether the controlled atmosphere cavity 10 is in a closed state by detecting the closed state of the fresh-keeping drawer.

[0091] The fresh-keeping device may include an oxygen concentration detection unit (not shown in the figure) and an air pressure detection unit (not shown in the figure), and the oxygen concentration detection unit is used to detect the oxygen concentration in the chamber 10 to be gas-conditioned. For example, the oxygen concentration detection unit may include an oxygen concentration sensor. The air pressure detection unit is used to detect the gas pressure in the chamber 10 to be gas-conditioned. For example, the air pressure detection unit may include a pressure (vacuum degree) sensor.

[0092] After the real-time oxygen concentration and the real-time gas pressure are measured, the controlled atmosphere chamber 10 can be exhausted based on the real-time oxygen concentration and the real-time gas pressure, thereby achieving a controlled atmosphere preservation effect.

[0093] Among them, different items (such as fruits, vegetables, meat, eggs, seafood, etc.) correspond to different most suitable oxygen concentrations. In this embodiment, the first set oxygen concentration and the second set oxygen concentration corresponding to the items stored in the fresh-keeping device can be configured. The first set oxygen concentration refers to the maximum value of the oxygen concentrations suitable for the above items, and the second set oxygen concentration refers to the minimum value of the oxygen concentrations suitable for the above items. After detecting the real-time oxygen concentration, it can be determined whether the detected real-time oxygen concentration is greater than the first set oxygen concentration, thereby determining whether the current oxygen concentration is a suitable oxygen concentration.

[0094] Among them, the fresh-keeping device generally corresponds to a negative pressure range that it can withstand. Therefore, in order to ensure that the fresh-keeping device will not be damaged by negative pressure, its corresponding set gas pressure can be preset in advance. This set gas pressure can be the minimum gas pressure in the gas conditioning chamber 10 of the fresh-keeping device. After the real-time gas pressure is detected, it can be determined that the detected real-time gas pressure is greater than the set gas pressure, thereby determining whether the current gas pressure is within the appropriate pressure range.

[0095] In this embodiment, if the real-time oxygen concentration is greater than the first set oxygen concentration, it means that the current oxygen concentration in the atmosphere chamber 10 is too high, which is not conducive to freshness preservation, and the oxygen concentration needs to be reduced by atmosphere conditioning. If the real-time gas pressure is greater than the set gas pressure, it means that the gas pressure in the atmosphere chamber 10 is within the tolerance range of the safety device, and it can be exhausted.

[0096] In view of this, when the real-time oxygen concentration is greater than the first set oxygen concentration and the real-time gas pressure is greater than the set gas pressure, the atmosphere-controlled chamber 10 can be exhausted to improve the preservation effect of the preservation device.

[0097] Among them, during the process of reducing the oxygen concentration in the gas conditioning chamber 10 by exhausting gas, if the real-time gas pressure drops to the set gas pressure, it indicates that the gas pressure in the gas conditioning chamber 10 has reached the lowest gas pressure that the insurance device can withstand. Then, the exhaust process can be stopped to avoid damage to the fresh-keeping device. Additionally, during the process of reducing the oxygen concentration in the gas conditioning chamber 10 by exhausting gas, if the real-time gas pressure is always greater than the set gas pressure, that is, it has not reached the set gas pressure, it indicates that the gas conditioning chamber 10 can still be exhausted. When the real-time oxygen concentration reaches the second set oxygen concentration, it means that the oxygen concentration in the gas conditioning chamber 10 has reached the lowest appropriate oxygen concentration, and the exhaust process can be stopped to ensure the fresh-keeping effect. That is to say, when the real-time oxygen concentration is greater than the first set oxygen concentration and the real-time gas pressure is greater than the set gas pressure, the gas conditioning chamber 10 is exhausted until the real-time gas pressure reaches the set gas pressure, or until the real-time oxygen concentration in the state where the real-time gas pressure is greater than the set gas pressure reaches the second set oxygen concentration.

[0098] In some embodiments,

[0099] the fresh-keeping device can be a Figures 2 to 5 fresh-keeping drawer as shown. After the user closes the fresh-keeping drawer, the interior of the fresh-keeping drawer forms a sealed space. Then, the oxygen concentration in the gas conditioning chamber 10 can be detected by an oxygen concentration sensor, and the gas pressure in the gas conditioning chamber 10 can be detected by a pressure sensor.

[0100] Among them, when the fresh-keeping drawer is closed for the first time, the oxygen concentration is generally 20.9% and the air pressure is generally 1 atm. The first set oxygen concentration (such as 10%) and the second set oxygen concentration (such as 8%) of the fresh-keeping drawer are pre-configured according to different stored items. The oxygen concentration between the first set oxygen concentration and the second set oxygen concentration is the most suitable oxygen concentration for fresh-keeping. And the corresponding set gas pressure is configured according to the pressure resistance of the fresh-keeping drawer.

[0101] In this embodiment, after detecting that the fresh-keeping drawer is closed, the real-time oxygen concentration and real-time gas pressure inside the fresh-keeping drawer can be monitored. If the detected real-time oxygen concentration is greater than the first set oxygen concentration and the detected real-time gas pressure is greater than the set gas pressure, the gas solenoid valve of the fresh-keeping device can be opened and the vacuum pump can be started. Under the action of the vacuum pump, the gas in the gas conditioning cavity 10 enters the outermost first gas conditioning sub-space 201 in the gas conditioning channel 20 through the basic gas conditioning membrane 113. Although the entering gas is oxygen-rich gas, it still contains a part of nitrogen. Subsequently, this part of the gas enters the middle second gas conditioning sub-space 202 through the first auxiliary gas conditioning membrane 114a. After further filtration by the first auxiliary gas conditioning membrane 114a, a part of nitrogen can be blocked again, so that the oxygen is further enriched and the concentration is increased. Then, this part of the gas enters the innermost third gas conditioning sub-space 203 through the second auxiliary gas conditioning membrane 114b, blocking most of the nitrogen, and the oxygen concentration is further enriched. Finally, it is discharged through the exhaust pipeline 141.

[0102] In this embodiment, if the real-time air pressure reaches the set gas pressure during the process of exhausting and reducing oxygen, it means that the safety pressure range that the fresh-keeping device can bear is about to be exceeded, then the vacuum pump is stopped and the gas solenoid valve is closed. If the real-time gas pressure always remains greater than the set gas pressure during the process of exhausting and reducing oxygen, that is, it means that it is within the safe pressure range, then the vacuum pump is stopped and the gas solenoid valve is closed until the oxygen concentration reaches the second set oxygen concentration.

[0103] It should be noted that since it is difficult for the mechanical structure to achieve absolute airtightness, the fresh-keeping device can only maintain pressure for a period of time. In addition, when the user opens the drawer, external air will also enter the gas conditioning cavity 10 of the fresh-keeping device. Therefore, in this embodiment, the oxygen concentration sensor and the air pressure sensor can monitor data in real time. When it is detected that the real-time oxygen concentration is greater than the first set concentration and the real-time gas pressure is greater than the set gas pressure, the oxygen reduction operation can be started, that is, the vacuum pump is started and the gas solenoid valve is opened. Thus, the gas conditioning cavity 10 of the fresh-keeping device is always maintained within the optimal fresh-keeping oxygen concentration range and kept within the safe pressure range.

[0104] In this embodiment, through the above fresh-keeping device and the gas conditioning fresh-keeping method, the oxygen concentration of the extracted gas can be extremely high and the content of other gases can be extremely low. Only a small volume of gas needs to be extracted to achieve a large reduction in oxygen, so as to improve the oxygen reduction efficiency and shorten the oxygen reduction time without improving the performance of the vacuum pump and the drawer structure, and no large negative pressure will be formed inside, better avoiding damage to the fresh-keeping device.

[0105] In an exemplary embodiment, a refrigerator (not shown in the figure) is provided. The refrigerator may include the fresh-keeping device in the above embodiment to improve the fresh-keeping effect of the refrigerator.

[0106] In this refrigerator, through the above-mentioned freshness preservation device, it is possible to improve the oxygen reduction efficiency, shorten the oxygen reduction time, and avoid forming a large negative pressure inside without the need to improve the performance of the vacuum pump and the pressure resistance of the structure, thereby better improving the oxygen reduction efficiency and better ensuring the freshness preservation effect.

[0107] Professional personnel should also be able to further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented by electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0108] It should be noted that phrases such as "one embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Moreover, when combining specific features, structures, or characteristics with an embodiment, it is within the knowledge scope of those skilled in the art to implement such features, structures, or characteristics in combination with other embodiments, whether explicitly or implicitly described.

[0109] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article, or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article, or device including the said element.

[0110] The above embodiments are only preferred embodiments given to fully illustrate this application, and the protection scope of this application is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art based on this application are within the protection scope of this application.

Claims

1. A controlled atmosphere structure, characterized in that: The gas-controlled structure includes a basic gas-controlled membrane and a gas-controlled channel connected to the gas-controlled cavity through the basic gas-controlled membrane. The gas-adjusting structure comprises at least one auxiliary gas-adjusting membrane, and the gas-adjusting channel is divided into at least two gas-adjusting sub-spaces connected in sequence by at least one auxiliary gas-adjusting membrane; Wherein, when the gas to be gas-conditioned cavity is exhausted, the gas passes through at least two of the gas-conditioned sub-spaces in sequence and then is exhausted.

2. The atmosphere-controlled structure according to claim 1, characterized in that: The gas-adjusting structure comprises a groove-shaped frame, and an open end of the groove-shaped frame abuts against a cavity wall constituting the cavity to be gas-adjusted, so that the groove-shaped frame and the cavity wall enclose the gas-adjusting channel.

3. The atmosphere-controlled structure according to claim 2, characterized in that: The channel-shaped frame comprises a bottom wall, a first basic side wall and a second basic side wall, wherein the bottom wall is arranged opposite to the cavity wall, the second basic side wall is configured as a concave structure, and the opening end of the second basic side wall abuts against the first basic side wall; The second basic side wall includes a hollow structure, and the basic atmosphere-modifying membrane is attached to the air inlet side of the second basic side wall.

4. The atmosphere-controlled structure according to claim 3, characterized in that: The gas-controlled structure comprises at least one auxiliary side wall, and at least one of the auxiliary side walls corresponds to at least one of the auxiliary gas-controlled films one by one; The auxiliary side wall is configured as a concave structure, the auxiliary side wall is located in the groove-shaped frame, and the opening end of the auxiliary side wall abuts against the first basic side wall; In the exhaust direction of the gas in the gas-adjusting channel, the second basic side wall, at least one auxiliary side wall and the first basic side wall are arranged in sequence to form at least two gas-adjusting sub-spaces arranged in sequence; The auxiliary side wall includes a hollow structure, and in the auxiliary side wall and the auxiliary gas-conditioning film corresponding to each other, the auxiliary gas-conditioning film is attached to the air inlet side of the auxiliary side wall.

5. The atmosphere-controlled structure according to claim 4, characterized in that: The portion of the first basic side wall used to form the terminal gas conditioning subspace is provided with a vent hole for exhausting the gas in the terminal gas conditioning subspace; Wherein, in the exhaust direction of the gas in the gas-adjusting channel, the terminal gas-adjusting subspace is the gas-adjusting subspace away from the cavity to be gas-adjusted among the at least two gas-adjusting subspaces.

6. The atmosphere-controlled structure according to any one of claims 1 to 5, characterized in that: In the exhaust direction of the gas in the gas-adjusting channel, in at least two of the gas-adjusting sub-spaces, the volume of the gas-adjusting sub-space on the upstream side is greater than the volume of the gas-adjusting sub-space on the downstream side.

7. A fresh-keeping device, characterized in that: The fresh-keeping device comprises an exhaust assembly and an atmosphere-controlled structure as claimed in any one of claims 1 to 6; In the exhaust direction of the gas in the atmosphere-adjusting structure, the atmosphere-adjusting subspace far away from the cavity to be atmosphere-adjusted among at least two atmosphere-adjusting subspaces is communicated with the exhaust assembly.

8. The fresh-keeping device according to claim 7, characterized in that: The fresh-keeping device comprises an oxygen concentration detection unit and an air pressure detection unit. The oxygen concentration detection unit is used to detect the oxygen concentration in the cavity to be gas-conditioned, and the air pressure detection unit is used to detect the gas pressure in the cavity to be gas-conditioned.

9. The fresh-keeping device according to claim 7 or 8, characterized in that: The fresh-keeping device comprises a cavity part and a drawer part, wherein the opening side of the drawer part faces the cavity wall at the top of the cavity part; When the drawer part and the cavity part are in a closed state, the drawer part and the cavity part form a sealed cavity to be gas-conditioned; Wherein, when the atmosphere-adjusting structure includes a groove-shaped frame, the open end of the groove-shaped frame abuts against the cavity wall at the top of the cavity portion, so that the groove-shaped frame and the cavity wall enclose the atmosphere-adjusting channel.

10. A refrigerator, characterized in that: The refrigerator comprises a fresh-keeping device as described in any one of claims 7 to 9.

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