CN215337247U

CN215337247U - A kind of refrigerator

Info

Publication number: CN215337247U
Application number: CN202120904710.2U
Authority: CN
Inventors: 程星光; 郭琨; 陈佳弘; 李信良
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2021-12-28
Anticipated expiration: 2031-04-28

Abstract

The utility model discloses a refrigerator. Which comprises the following steps: the nitrogen-oxygen separation membrane module is arranged on the drawer and is respectively connected with the plurality of fresh-keeping spaces, and the nitrogen-oxygen separation membrane module is used for separating oxygen from the fresh-keeping spaces; the adjustable modified atmosphere membrane assemblies are respectively arranged on the plurality of fresh-keeping spaces and comprise modified atmosphere membranes and adjusting pieces, the adjusting pieces are used for adjusting the effective use areas of the modified atmosphere membranes, and each adjustable modified atmosphere membrane assembly is used for adjusting the effective use areas of the modified atmosphere membranes according to the fresh-keeping requirements of the corresponding fresh-keeping space. The nitrogen-oxygen separation membrane module and the adjustable modified atmosphere membrane module are matched, active modified atmosphere and passive modified atmosphere of oxygen concentration in each fresh-keeping space can be realized, and the oxygen concentration of different partitions in the drawer is adjusted to be in a corresponding appropriate range. The method can accurately control oxygen for the fruits and vegetables in each partition while ensuring the partitioned preservation of the fruits and vegetables, thereby meeting the modified atmosphere preservation requirements of different fruits and vegetables.

Description

A kind of refrigerator

Technical Field

The utility model relates to the technical field of refrigerators, in particular to a refrigerator.

Background

The refrigerator becomes one of the household appliances necessary for each family, and with the improvement of living standard and purchasing power of people, the requirement for keeping food fresh is higher and higher. At present, the controlled atmosphere preservation technology is a technology with a wide application range in the field of fruit and vegetable preservation, inhibits the respiration of fruits and vegetables, delays the metabolism process, enables the fruits and vegetables to be in a dormant state, prevents the fruits and vegetables from rotting and deteriorating, and prolongs the storage period by controlling various gas environment parameters in the storage environment.

The control scheme of oxygen reduction and fresh keeping disclosed at present is the control of a single chamber, but the oxygen requirements of different fruits and vegetables are different, and the oxygen control scheme of the single chamber cannot meet the fresh keeping requirements of different fruits and vegetables.

With the endless variety of food, consumers have more and more strong consciousness of classified preservation, and the refrigeration drawers in the refrigerator begin to develop towards subareas. For the preservation chamber with the subareas, how to precisely control oxygen and preserve the fruits and the vegetables in different subareas is a problem to be solved urgently.

Aiming at the problem of how to realize accurate oxygen control and fresh keeping of fruits and vegetables in different partitions of a refrigerator in the prior art, an effective solution is not provided at present.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a refrigerator, which aims to solve the problem of how to accurately control oxygen and keep fresh of fruits and vegetables in different partitions of the refrigerator in the prior art.

In order to solve the above technical problem, the present invention provides a refrigerator, comprising:

the refrigerator comprises a drawer, a door and a door, wherein a plurality of fresh-keeping spaces which are relatively isolated from air are formed in the drawer;

the nitrogen-oxygen separation membrane module is respectively connected with the plurality of fresh-keeping spaces and is used for separating oxygen from the fresh-keeping spaces;

the adjustable modified atmosphere modules are respectively arranged on the plurality of fresh-keeping spaces and comprise modified atmosphere films and adjusting pieces, the modified atmosphere films are used for adjusting the oxygen concentration and the carbon dioxide concentration of the fresh-keeping spaces relative to the external space, the adjusting pieces are used for adjusting the effective use areas of the modified atmosphere films, and the adjustable modified atmosphere modules are used for adjusting the effective use areas of the modified atmosphere films according to the fresh-keeping requirements of the fresh-keeping spaces corresponding to the adjustable modified atmosphere modules.

Furthermore, two fresh-keeping spaces are formed in the drawer, the nitrogen-oxygen separation membrane module is respectively connected with the plurality of fresh-keeping spaces, the number of the adjustable gas regulating membrane modules is two, and the two adjustable gas regulating membrane modules are respectively arranged on the two fresh-keeping spaces.

The refrigerator further comprises a plurality of oxygen sensors which are respectively arranged in the plurality of fresh-keeping spaces, the oxygen sensors are used for detecting oxygen concentration values in the fresh-keeping spaces, and the adjustable modified atmosphere module is used for adjusting the effective use area of the corresponding modified atmosphere film according to the oxygen concentration values detected by the oxygen sensors.

Further, the adjusting piece comprises a protection plate and a plurality of openable and closable vent holes arranged on the protection plate, the protection plate is attached to the modified atmosphere film, and the effective use area of the modified atmosphere film is adjusted by opening/closing part or all of the plurality of openable and closable vent holes by the adjusting piece.

Furthermore, the number of the protective plates is two, and the modified atmosphere film is clamped between the two protective plates.

Further, the nitrogen-oxygen separation membrane module comprises:

the nitrogen-oxygen separation membrane modules are used for separating nitrogen and oxygen from the plurality of fresh-keeping spaces respectively;

and the vacuum pump is respectively connected with the plurality of nitrogen-oxygen separation membrane modules through an exhaust pipe and used for exhausting oxygen in the fresh-keeping space through the nitrogen-oxygen separation membrane modules.

Further, the nitrogen-oxygen separation membrane module is at least partially arranged in the fresh-keeping space, and the vacuum pump is arranged in the drawer or outside the drawer.

Furthermore, the nitrogen-oxygen separation membrane module also comprises a plurality of control valves, and the control valves are respectively arranged on the exhaust pipes connected with the nitrogen-oxygen separation membrane modules and are used for controlling the extraction of oxygen corresponding to the fresh-keeping space.

Further, the nitrogen-oxygen separation membrane module comprises a wind power component, wherein the wind power component is arranged at the nitrogen-oxygen separation membrane module and is used for enabling air at the nitrogen-oxygen separation membrane module to circulate to prevent nitrogen from gathering.

Further, the wind power component is a fan mounted on the nitrogen-oxygen separation membrane module.

Furthermore, the number of the fans is two, and the two fans are arranged on the nitrogen-oxygen separation membrane module in parallel.

Furthermore, the nitrogen-oxygen separation membrane module comprises a plurality of stacked nitrogen-oxygen separation membranes, and the exhaust pipes are respectively communicated with the oxygen filtration sides of the plurality of nitrogen-oxygen separation membranes.

The nitrogen-oxygen separation membrane module and the adjustable modified atmosphere membrane module are matched, active modified atmosphere and passive modified atmosphere of oxygen concentration in each fresh-keeping space can be realized, and the oxygen concentration of different partitions in the drawer is adjusted to be in a corresponding appropriate range. The method can accurately control oxygen for the fruits and vegetables in each partition while ensuring the partitioned preservation of the fruits and vegetables, thereby meeting the modified atmosphere preservation requirements of different fruits and vegetables.

Drawings

Fig. 1 is an overall structural schematic view of an embodiment of a refrigerator according to the present invention;

FIG. 2 is a schematic diagram of the structure of an adjustable modified atmosphere module of the refrigerator of FIG. 1;

FIG. 3 is a schematic structural view of a nitrogen-oxygen separation membrane module of the refrigerator of FIG. 1;

fig. 4 is a perspective view illustrating a drawer of the refrigerator of fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.

Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.

The utility model provides a partitioned air conditioning scheme for gas concentration, which can realize linkage control of an air conditioning film and oxygen reduction equipment (nitrogen-oxygen separation film component) according to oxygen concentrations in different fresh-keeping spaces in a drawer, so that the oxygen concentrations in the different fresh-keeping spaces are adjusted to be in an optimal appropriate range corresponding to the types of food materials stored in the different fresh-keeping spaces. The method can accurately control oxygen for the fruits and vegetables in each partition while ensuring the partitioned preservation of the fruits and vegetables. The structure of the refrigerator will be described below.

Compared with the traditional air-conditioning film fresh-keeping drawer, the refrigerator is structurally provided with the oxygen reduction device (the nitrogen-oxygen separation film component) to realize active air conditioning of each fresh-keeping space in the drawer, and the oxygen concentration in each fresh-keeping space can be relatively and rapidly adjusted. The air-conditioning film is arranged, so that oxygen in the air can enter each fresh-keeping space through the air-conditioning film, the oxygen concentration of each fresh-keeping space is adjusted, and passive air conditioning is realized.

Fig. 1 shows an embodiment of the refrigerator of the present invention, which comprises a drawer 10, a nitrogen-oxygen separation membrane module 20 and a plurality of adjustable gas regulating membrane modules 30. A plurality of fresh-keeping spaces relatively isolated from air are formed in the drawer 10, the nitrogen-oxygen separation membrane modules 20 are respectively connected with the plurality of fresh-keeping spaces, and the nitrogen-oxygen separation membrane modules 20 are used for separating oxygen from the fresh-keeping spaces. The plurality of adjustable gas regulating membrane assemblies 30 are respectively arranged on the plurality of fresh-keeping spaces, and each adjustable gas regulating membrane assembly 30 comprises a gas regulating membrane 31 and an adjusting piece 32. When the modified atmosphere film 31 is used, the oxygen concentration, the carbon dioxide concentration and the humidity of the fresh-keeping space relative to the external space are adjusted by the adjusting piece 32, the effective use area of the modified atmosphere film 31 is adjusted by each modified atmosphere film assembly 30 according to the fresh-keeping requirement of the corresponding fresh-keeping space.

By applying the technical scheme of the utility model, oxygen can be separated from the fresh-keeping space through the nitrogen-oxygen separation membrane component 20, so that a low-oxygen atmosphere is created in the fresh-keeping space, and the fresh-keeping of food materials such as fruits and vegetables is facilitated. The oxygen concentration and the carbon dioxide concentration in the fresh-keeping space can be finely adjusted through the air-adjusting film 31, the fresh-keeping space is used, the oxygen concentration in the fresh-keeping space can be further reduced under the respiration effect of the food materials such as fruits and vegetables, the carbon dioxide concentration is increased, therefore, the oxygen in the external space can be properly supplemented into the fresh-keeping space through the air-adjusting film 31, the carbon dioxide in the fresh-keeping space is scattered to the external space, and the anaerobic respiration of the food materials such as fruits and vegetables caused by the over-low oxygen concentration and the over-high carbon dioxide concentration in the fresh-keeping space is avoided. The effective use area of the modified atmosphere film 31 is adjusted through the adjusting piece 32, so that the adjusting effect of the modified atmosphere film 31 on the oxygen concentration and the carbon dioxide concentration in the fresh-keeping space can be adjusted, the situation that the oxygen is too much enters the fresh-keeping space to destroy the low-oxygen atmosphere is avoided, and the anaerobic respiration of food materials such as fruits and vegetables caused by too low oxygen concentration and too high carbon dioxide concentration in the fresh-keeping space is also avoided. Because the adjustable atmosphere control membrane assemblies 30 are respectively arranged on the plurality of fresh-keeping spaces, the effective use areas of the atmosphere control membranes 31 can be adjusted through the adjustable atmosphere control membrane assemblies 30 according to the fresh-keeping requirements of the corresponding fresh-keeping spaces, so that the adjusting rate of the oxygen concentration and the carbon dioxide concentration of each fresh-keeping space accords with the breathing rate of the stored food materials such as fruits and vegetables. Thus, different food materials such as fruits and vegetables can be respectively stored in the plurality of fresh-keeping spaces formed in the drawer 10 by adopting the refrigerator of the utility model, and then the corresponding adjustable gas regulating membrane component 30 is adjusted according to the respiration rate of the specific food materials such as fruits and vegetables.

In addition, it should be noted that the modified atmosphere film 31 has a certain moisture permeability, and can maintain the humidity in the fresh-keeping space at a certain level, which is beneficial to keeping food materials such as fruits and vegetables fresh.

Optionally, as shown in fig. 1, in the technical solution of this embodiment, two fresh-keeping spaces are formed in the drawer 10, the nitrogen-oxygen separation membrane module 20 is respectively connected to the plurality of fresh-keeping spaces, and two adjustable gas-regulating membrane modules 30 are respectively disposed on the two fresh-keeping spaces. Specifically, when the air-conditioned film is used, the two fresh-keeping spaces can be respectively used as a fruit partition and a vegetable partition, and the effective use areas of the corresponding air-conditioned films 31 can be adjusted according to different respiration rates of fruits and vegetables.

More preferably, as shown in fig. 4, in the technical solution of the present embodiment, the refrigerator further includes a plurality of oxygen sensors 40, and the plurality of oxygen sensors 40 are respectively disposed on the plurality of fresh-keeping spaces. When the adjustable controlled atmosphere membrane module 30 is used, the oxygen concentration value in the fresh-keeping space is detected by the oxygen sensor 40, and the effective use area of the corresponding controlled atmosphere membrane 31 is adjusted according to the oxygen concentration value detected by the oxygen sensor 40, so that the oxygen in each fresh-keeping space is effectively maintained in a required interval.

As shown in fig. 2, optionally, in the technical solution of the present embodiment, the adjusting member 32 includes a protecting plate 321 and a plurality of openable and closable vent holes 322 disposed on the protecting plate 321, and the protecting plate 321 is attached to the modified atmosphere film 31. In use, the regulating member 32 regulates the effective use area of the modified atmosphere film 31 by opening/closing part or all of the plurality of openable/closable vent holes 322.

Optionally, the adjusting member 32 includes a fully closed state, a modified atmosphere adjusting state, and a modified atmosphere fully open state. Wherein, all the openable vent holes 322 are closed in the fully closed state, and the effective use area of the air adjusting film 31 is adjusted to be 0 percent; the opening part can open and close the vent hole 322 in the air-conditioning adjusting state, and the effective use area of the air-conditioning adjusting film 31 is between 0 and 100 percent; all the openable vent holes 322 are opened in the fully open state of the atmosphere control, and the effective use area of the atmosphere control film 31 is 100%.

As an alternative embodiment, the opening/closing of the openable vent 322 may be achieved in such a way that the shutter moves relative to the protective plate 321 to avoid/shield the openable vent 322. More preferably, there are two protective plates 321, and the modified atmosphere film 31 is sandwiched between the two protective plates 321 to protect the modified atmosphere film 31 from being damaged.

As shown in fig. 3, in the technical solution of the present embodiment, the nitrogen-oxygen separation membrane module 20 includes a plurality of nitrogen-oxygen separation membrane modules 21 and a vacuum pump 22, the plurality of nitrogen-oxygen separation membrane modules 21 respectively separate nitrogen and oxygen from the plurality of fresh-keeping spaces, the vacuum pump 22 is respectively connected to the plurality of nitrogen-oxygen separation membrane modules 21 through an air extraction pipe 23, and the vacuum pump 22 extracts oxygen from the fresh-keeping spaces through the nitrogen-oxygen separation membrane modules 21. As shown in fig. 1, when using, the nox separation membrane module 21 is disposed in the fresh-keeping space, the vacuum pump 22 can be disposed outside the fresh-keeping space, one vacuum pump 22 acts on the plurality of nox separation membrane modules 21 through the exhaust tube 23 respectively, the nox separation membrane module 21 only allows oxygen to pass through, and the nitrogen remains in the fresh-keeping space, and the oxygen separated by the nox separation membrane module 21 is discharged to the external space through the exhaust tube 23 and the vacuum pump 22.

Optionally, in the technical solution of this embodiment, the nitrogen-oxygen separation membrane module 21 is at least partially disposed inside the fresh-keeping space, and the vacuum pump 22 may be disposed outside the drawer 10. Wherein, at least one side of the nitrogen-oxygen separation membrane module 21 blocking nitrogen circulation should be ensured to be positioned in the drawer 10 when in use, and it is also feasible that the whole nitrogen-oxygen separation membrane module 21 is positioned in the drawer 10. The vacuum pump 22 is arranged outside the drawer 10 and connected with the nitrogen-oxygen separation membrane module 21 through the exhaust tube 23, and the position of the vacuum pump 22 can be a position adjacent to the drawer 10, or a position far away from the drawer 10, such as a refrigerator liner or a compressor bin, as long as the vacuum pump is connected with the nitrogen-oxygen separation membrane module 21 through the exhaust tube 23. Alternatively, the vacuum pump 22 may be disposed within the drawer 10 such that the vacuum pump 22 exhausts oxygen from the drawer 10 through an exhaust pipe.

More preferably, in the technical solution of the present embodiment, the nitrogen-oxygen separation membrane module 20 further includes a plurality of control valves 25, and the control valves 25 are respectively disposed on the extraction pipes 23 connected to the plurality of nitrogen-oxygen separation membrane modules 21. When the oxygen-free fresh-keeping device is used, the oxygen extraction of the corresponding fresh-keeping space can be controlled through the control valve 25, so that the oxygen concentration of the corresponding fresh-keeping space is maintained within a certain range.

When nitrogen is excessively accumulated at the nitrogen-oxygen separation membrane module 21, oxygen permeation is blocked, and oxygen reduction efficiency is affected. More preferably, as shown in fig. 3, the nitrogen and oxygen separation membrane module 20 includes a wind power part 24, and the wind power part 24 is provided at the nitrogen and oxygen separation membrane module 21. When in use, the wind power component 24 can make the air at the nitrogen-oxygen separation membrane module 21 circulate to prevent the nitrogen from gathering, thereby improving the separation efficiency of the nitrogen-oxygen separation membrane module 20 on the oxygen in the fresh-keeping space.

As an alternative embodiment, the wind power unit 24 is a fan mounted on the nitrogen-oxygen separation membrane module 21. Preferably, the number of the fans is two, and the two fans are arranged on the nitrogen-oxygen separation membrane module 21 in parallel, so that the air circulation efficiency in the fresh-keeping space is improved. As a further alternative, the wind member 24 may also be a ventilation board that is movable to circulate the air flow.

As shown in fig. 4, in the technical solution of the present embodiment, the nitrogen-oxygen separation membrane module 21 includes a plurality of stacked nitrogen-oxygen separation membranes 211, and the exhaust pipes 23 are respectively communicated with the oxygen-filtering sides of the plurality of nitrogen-oxygen separation membranes 211.

It should be noted that the oxygen reduction principle of the nitrogen-oxygen separation membrane 211 is dissolution-diffusion, oxygen and nitrogen have different dissolution rates and passing rates on the nitrogen-oxygen separation membrane 211, and under the pushing of the vacuum pressure of the vacuum pump 22, oxygen can more easily permeate through the nitrogen-oxygen separation membrane and be discharged at the oxygen-rich end, thereby achieving the effect of rapid oxygen reduction.

The modified atmosphere film 31 is a polymer film, and can perform molecular diffusion movement according to the difference in gas concentration between the inside and the outside of the film under normal pressure, and oxygen, carbon dioxide, and water molecules have different permeation rates, as shown in table 1 below. When the concentration of the carbon dioxide in the fresh-keeping space is proper, the relative stability of the concentration of the oxygen and the concentration of the carbon dioxide in the fresh-keeping space can be adjusted.

TABLE 1

By applying the refrigerator provided by the utility model, the vacuum pump is controlled to be started according to the preset initial flow under the condition that the drawer is closed, and the effective use area of the air-conditioning film is adjusted to be zero. And then monitoring the oxygen concentration of each fresh-keeping space in the drawer, and executing a corresponding adjustment strategy according to the oxygen concentration of each fresh-keeping space so as to adjust the flow rate of the vacuum pump and the effective use area of the air-conditioned membrane. Based on this, the nitrogen-oxygen separation membrane module and the adjustable gas regulating membrane module are matched, active gas regulation and passive gas regulation of the oxygen concentration in each fresh-keeping space can be realized, and the oxygen concentrations in different partitions in the drawer are all regulated to corresponding appropriate ranges. The method has the advantages that the fruits and vegetables are preserved in the subareas, and the oxygen control is accurately carried out on the fruits and vegetables in each subarea, so that the modified atmosphere preservation requirements of different fruits and vegetables are met, and the method has important application value.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A refrigerator, characterized by comprising:

a drawer (10), wherein a plurality of fresh-keeping spaces which are relatively isolated from air are formed in the drawer (10);

the nitrogen-oxygen separation membrane module (20) is respectively connected with the plurality of fresh-keeping spaces, and the nitrogen-oxygen separation membrane module (20) is used for separating oxygen from the fresh-keeping spaces;

the adjustable gas-regulating membrane assemblies (30) are respectively arranged on the plurality of fresh-keeping spaces, each adjustable gas-regulating membrane assembly (30) comprises a gas-regulating membrane (31) and an adjusting piece (32), each gas-regulating membrane (31) is used for adjusting the oxygen concentration of the fresh-keeping space relative to the external space, the adjusting pieces (32) are used for adjusting the effective use area of the gas-regulating membrane (31), and each adjustable gas-regulating membrane assembly (30) is used for adjusting the effective use area of the gas-regulating membrane (31) according to the fresh-keeping requirement of the corresponding fresh-keeping space.

2. The refrigerator according to claim 1, wherein two fresh-keeping spaces are formed in the drawer (10), the nitrogen-oxygen separation membrane module (20) is connected to each of the plurality of fresh-keeping spaces, the number of the adjustable gas-regulating membrane modules (30) is two, and the two adjustable gas-regulating membrane modules (30) are respectively disposed on the two fresh-keeping spaces.

3. The refrigerator of claim 1, further comprising a plurality of oxygen sensors (40), wherein the plurality of oxygen sensors (40) are respectively disposed in a plurality of fresh keeping spaces, the oxygen sensors (40) are used for detecting oxygen concentration values in the fresh keeping spaces, and the tunable gas regulating film assembly (30) is used for adjusting the effective use area of the corresponding gas regulating film (31) according to the oxygen concentration values detected by the oxygen sensors (40).

4. The refrigerator according to claim 1, wherein the adjusting member (32) comprises a protective plate (321) and a plurality of openable and closable vent holes (322) provided on the protective plate (321), the protective plate (321) is attached to the modified atmosphere film (31), and the adjusting member (32) adjusts an effective use area of the modified atmosphere film (31) by opening/closing part or all of the plurality of openable and closable vent holes (322).

5. The refrigerator according to claim 4, wherein the number of the protective plates (321) is two, and the modified atmosphere film (31) is interposed between the two protective plates (321).

6. The refrigerator according to claim 1, wherein the nitrogen-oxygen separation membrane module (20) comprises:

a plurality of nitrogen-oxygen separation membrane modules (21) for separating nitrogen and oxygen from the plurality of fresh-keeping spaces, respectively;

and the vacuum pump (22) is respectively connected with the plurality of nitrogen-oxygen separation membrane modules (21) through an exhaust pipe (23), and the vacuum pump (22) is used for exhausting oxygen in the fresh-keeping space through the nitrogen-oxygen separation membrane modules (21).

7. The refrigerator according to claim 6, characterized in that the nitrogen-oxygen separation membrane module (21) is at least partially arranged inside the fresh food space, and the vacuum pump (22) is arranged inside the drawer (10) or outside the drawer (10).

8. The refrigerator according to claim 6, wherein the nitrogen-oxygen separation membrane module (20) further comprises a plurality of control valves (25), and the air exhaust pipes (23) connected to the plurality of nitrogen-oxygen separation membrane modules (21) are respectively provided with a control valve (25), and the control valves (25) are used for controlling the oxygen exhaust of the corresponding fresh-keeping space.

9. The refrigerator according to claim 6, wherein the nitrogen oxygen separation membrane module (20) includes a wind force part (24), the wind force part (24) being provided at the nitrogen oxygen separation membrane module (21) for circulating air at the nitrogen oxygen separation membrane module (21) to prevent nitrogen from being accumulated.

10. The refrigerator according to claim 9, wherein the wind power part (24) is a fan mounted on the nitrogen-oxygen separation membrane module (21).

11. The refrigerator as claimed in claim 10, wherein the number of the fans is two, and two fans are disposed in parallel on the nitrogen oxygen separation membrane module (21).

12. The refrigerator according to claim 6, wherein the nitrogen-oxygen separation membrane module (21) comprises a plurality of stacked nitrogen-oxygen separation membranes (211), and the air exhaust pipe (23) is respectively communicated with the oxygen filtration sides of the plurality of nitrogen-oxygen separation membranes (211).