Oxygen reduction device and refrigerator

Abstract

The utility model discloses a kind of oxygen reduction device and refrigerator, oxygen reduction device includes: it is between hollow fiber membrane assembly of air inlet box and oxygen enrichment box is arranged, hollow fiber membrane assembly is made of shell and hollow fiber membrane bundle in shell, and spiral air duct is formed between the outer surface of hollow fiber membrane bundle and shell;Wherein, the both ends of spiral air duct are communicated with air inlet box and oxygen enrichment box respectively;The first end of hollow fiber membrane bundle connection air inlet box is closed state, the second end of hollow fiber membrane bundle communication oxygen enrichment box is open state.Such by spiral air duct guiding airflow rotation, extend the moving path of airflow and give airflow tangential velocity, to form transverse sweeping motion on the outer surface of hollow fiber membrane bundle, continuously update the gas of contact hollow fiber membrane bundle's outer surface, improve oxygen permeation driving force, efficiently prevent the outer surface of hollow fiber membrane bundle form concentration difference polarization, realize efficient, stable oxygen separation.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration technology, and in particular to an oxygen reduction device and a refrigerator. Background Technology

[0002] Ice-temperature oxygen reduction technology is a key application in the field of food preservation. By reducing the oxygen concentration in the storage environment, it effectively inhibits the growth of microorganisms and oxidation reactions, thereby extending the shelf life of fresh agricultural products (such as fruits, vegetables, and meats).

[0003] In existing technologies, hollow fiber membrane modules are the core components for achieving efficient oxygen reduction. Their principle is to utilize the selective permeability of the membrane to preferentially separate oxygen from the air. However, traditional hollow fiber membrane modules suffer from concentration polarization problems in practical applications, specifically:

[0004] In traditional hollow fiber membrane modules, the gas renewal on the membrane surface is slow, forming a nearly static thin layer of air. The oxygen concentration in this boundary layer is much lower than that of the main fluid, resulting in "concentration polarization," which severely reduces the permeation driving force (partial pressure difference) and makes it difficult to achieve efficient and stable oxygen separation. Utility Model Content

[0005] This invention provides an oxygen reduction device and a refrigerator to solve the problem of concentration polarization in the hollow fiber membrane module of existing oxygen reduction devices, which makes it difficult to achieve efficient and stable oxygen separation.

[0006] The technical solution of this utility model is an oxygen reduction device, comprising:

[0007] A hollow fiber membrane assembly is disposed between the air inlet box and the oxygen enrichment box. The hollow fiber membrane assembly consists of a shell and a hollow fiber membrane bundle located inside the shell, and a spiral air duct is formed between the outer surface of the hollow fiber membrane bundle and the shell.

[0008] The two ends of the spiral air duct are respectively connected to the air inlet box and the oxygen enrichment box;

[0009] The first end of the hollow fiber membrane bundle connected to the air inlet box is in a closed state, while the second end of the hollow fiber membrane bundle connected to the oxygen-enriching box is in an open state.

[0010] Furthermore, a spiral guide is provided on the inner wall of the housing, and a spiral air duct is formed between the guide and the outer surface of the hollow fiber membrane bundle.

[0011] Furthermore, the spiral duct has a periodically varying corrugated structure along its axial direction, which is composed of alternating expansion and contraction sections.

[0012] The inner diameter of the expansion section is larger than the inner diameter of the adjacent contraction section.

[0013] Furthermore, the inner diameters of both the expansion section and the contraction section gradually decrease along the fluid flow direction of the spiral duct.

[0014] Furthermore, the hollow fiber membrane bundle is composed of multiple hollow fiber membrane filaments, all of which are spirally wound around a central axis, so that the hollow fiber membrane filaments maintain a spiral extension configuration from the inside to the outside in the radial direction of the hollow fiber membrane bundle.

[0015] Furthermore, the arrangement density of the hollow fiber membrane filaments in the hollow fiber membrane bundle gradually increases along the fluid flow direction of the spiral air duct.

[0016] Furthermore, the air intake box is provided with an air intake cavity, which is connected to the corresponding end of the spiral air duct;

[0017] At least one gas delivery device is provided on at least one outer wall of the air intake box, and the gas delivery device is used to draw external gas into the air intake cavity.

[0018] Furthermore, the oxygen-enriched box is independently provided with a first inner cavity and a second inner cavity;

[0019] The first inner cavity communicates with the second end of the hollow fiber membrane bundle, and the first inner cavity is used to collect the oxygen-rich gas generated by the hollow fiber membrane bundle;

[0020] The second inner cavity is connected to the corresponding end of the spiral duct, and the second inner cavity is used to collect nitrogen-rich gas in the spiral duct.

[0021] Furthermore, the first inner cavity is also connected to a vacuum pump via a suction pipe, the vacuum pump being used to expel the oxygen-rich gas in the first inner cavity to the outside.

[0022] This utility model also proposes a refrigerator, including a drawer, wherein the drawer is provided with an oxygen reduction device as described above.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] This invention guides airflow in a rotating manner through a spiral duct, extending the airflow path and imparting tangential velocity to the airflow. This creates a transverse sweeping motion on the outer surface of the hollow fiber membrane bundle, continuously renewing the gas in contact with the outer surface of the hollow fiber membrane bundle, and improving the oxygen permeation driving force. This effectively prevents concentration polarization from forming on the outer surface of the hollow fiber membrane bundle, achieving efficient and stable oxygen separation. Attached Figure Description

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects and not to describe a particular order.

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the oxygen reduction device proposed in this utility model;

[0028] Figure 2 This is a front view of the oxygen-reducing device proposed in this utility model;

[0029] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0030] Figure 4 This is a schematic diagram of gas flow in a cross-sectional view of the oxygen reduction device proposed in this utility model.

[0031] Figure 5 This is a schematic diagram of the radial cross-section of the hollow fiber membrane bundle proposed in this utility model;

[0032] Figure 6 This is a schematic diagram of the drawer structure proposed in this utility model;

[0033] Figure 7 This is an exploded view of the drawer proposed in this utility model.

[0034] Figure label:

[0035] 10. Air intake box;

[0036] 101. Inlet cavity; 102. Gas delivery device; 103. First outlet;

[0037] 20. Oxygen-enriched box;

[0038] 201. First inner cavity; 202. Second inner cavity; 203. Evacuation pipe; 204. Vacuum pump; 205. Second outlet; 206. Inlet;

[0039] 30. Hollow fiber membrane modules;

[0040] 301. Shell; 302. Hollow fiber membrane bundle; 3021. Hollow fiber membrane filament; 303. Spiral air duct; 304. Air guide;

[0041] 40. Drawer exterior;

[0042] 50. Drawer. Detailed Implementation

[0043] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present utility model, and does not imply that every embodiment of the present utility model must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0044] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0045] Ice-temperature oxygen reduction technology is a key application in the field of food preservation. By reducing the oxygen concentration in the storage environment, it effectively inhibits the growth of microorganisms and oxidation reactions, thereby extending the shelf life of fresh agricultural products (such as fruits, vegetables, and meats).

[0046] In existing technologies, hollow fiber membrane modules are the core components for achieving efficient oxygen reduction. Their principle is to utilize the selective permeability of the membrane to preferentially separate oxygen from the air. However, traditional hollow fiber membrane modules suffer from concentration polarization problems in practical applications, specifically:

[0047] In traditional hollow fiber membrane modules, the gas renewal on the membrane surface is slow, forming a nearly static thin layer of air. The oxygen concentration in this boundary layer is much lower than that of the main fluid, resulting in "concentration polarization," which severely reduces the permeation driving force (partial pressure difference) and makes it difficult to achieve efficient and stable oxygen separation.

[0048] Therefore, in some embodiments, such as Figures 1-3As shown, this utility model proposes an oxygen reduction device that can prevent concentration polarization and achieve efficient and stable oxygen separation, comprising:

[0049] A hollow fiber membrane assembly 30 is disposed between the air inlet box 10 and the oxygen enrichment box 20. The hollow fiber membrane assembly 30 is composed of a housing 301 and a hollow fiber membrane bundle 302 located inside the housing 301, and a spiral air duct 303 is formed between the outer surface of the hollow fiber membrane bundle 302 and the housing 301.

[0050] The two ends of the spiral air duct 303 are respectively connected to the air inlet box 10 and the oxygen enrichment box 20;

[0051] The first end of the hollow fiber membrane bundle 302 connected to the air inlet box 10 is in a closed state, and the second end of the hollow fiber membrane bundle 302 connected to the oxygen enrichment box 20 is in an open state.

[0052] It should be noted that the oxygen reduction device proposed in this embodiment is applied to the compartments or drawers of the refrigerator. The air inlet box 10 is used to draw the air in the compartments or drawers into the spiral air duct 303, and the oxygen enrichment box 20 is used to discharge the oxygen-enriched gas generated by the hollow fiber membrane bundle 302 to the outside, while simultaneously discharging the nitrogen-enriched gas in the spiral air duct 303 back into the compartments or drawers.

[0053] Furthermore, the first end of the hollow fiber membrane bundle 302 is in a closed state, that is, the first end is solidified and encapsulated by the encapsulation material, so that the inner cavity of the hollow fiber membrane bundle 302 at this end is sealed, so that the oxygen enriched by the hollow fiber membrane bundle 302 can only flow to the second end and cannot flow out from the first end.

[0054] In this way, the air in the compartment or drawer enters the spiral air duct 303 through the air inlet box 10. Then, the air in the spiral air duct 303 comes into contact with the outer surface of the hollow fiber membrane bundle 302. Driven by the partial pressure difference on both sides of the hollow fiber membrane bundle 302, the fast-permeating components in the air (such as oxygen) preferentially dissolve on the outer surface of the hollow fiber membrane bundle 302 and permeate and diffuse through the membrane material. They are desorbed on the low-pressure side of the hollow fiber membrane bundle 302 (i.e., the inner cavity of the hollow fiber membrane bundle 302). The desorbed oxygen gathers in the inner cavity of the hollow fiber membrane bundle 302 and moves along the axial direction of the inner cavity towards the oxygen-enriched box 20, and finally enters the oxygen-enriched box 20, thereby achieving air separation and purification.

[0055] Therefore, this invention guides the airflow to move in a rotating manner through the spiral air duct 303, extending the movement path of the airflow and giving it tangential velocity, thereby forming a transverse sweeping motion on the outer surface of the hollow fiber membrane bundle 302, continuously renewing the gas in contact with the outer surface of the hollow fiber membrane bundle 302, improving the oxygen permeation driving force, and thus effectively preventing concentration polarization from forming on the outer surface of the hollow fiber membrane bundle 302, achieving efficient and stable oxygen separation.

[0056] In some embodiments, such as Figure 3 As shown, a spiral guide 304 is provided on the inner sidewall of the housing 301, and a spiral air duct 303 is formed between the guide 304 and the outer surface of the hollow fiber membrane bundle 302.

[0057] In this way, the airflow in the spiral duct 303 can repeatedly impact the guide 304 and turn, thereby uniformly covering all the membrane filament areas in the hollow fiber membrane bundle 302, so as to make full use of the membrane area of ​​the hollow fiber membrane bundle 302.

[0058] Specifically, the spiral duct 303 has a periodically changing corrugated structure along its axial direction, which is composed of alternating expansion sections and contraction sections.

[0059] The inner diameter of the expansion section is larger than the inner diameter of the adjacent contraction section.

[0060] This design allows the airflow to continuously experience different centrifugal forces and velocity changes in spiral ducts 303 of different diameters, thereby inducing Dean vortices, which greatly enhances radial mixing and shearing, thereby enhancing gas disturbance on the outer surface of the hollow fiber membrane bundle 302 and destroying the concentration polarization layer of the hollow fiber membrane bundle 302.

[0061] Furthermore, the induced Dean vortex acts like a small agitator, scouring the outer surface of the hollow fiber membrane bundle 302, thereby preventing local increases in oxygen concentration, maintaining high permeability driving force, improving gas mass transfer efficiency, and increasing oxygen reduction efficiency.

[0062] Specifically, the inner diameters of both the expansion section and the contraction section gradually decrease along the fluid flow direction of the spiral duct 303.

[0063] Understandably, the entire hollow fiber membrane bundle 302 is cone-shaped.

[0064] This design allows the airflow speed to gradually increase along the fluid flow direction of the spiral duct 303 until the airflow speed at the end of the spiral duct 303 (equivalent to the end of the spiral duct 303 connected to the oxygen-enriched box 20) is the maximum. This allows the nitrogen to be quickly discharged from the spiral duct 303 through high-speed airflow, avoiding the accumulation of nitrogen in the air near the hollow fiber membrane bundle 302 and avoiding affecting the subsequent oxygen separation efficiency.

[0065] Of course, in other embodiments (not shown in the figure), only the inner diameters of the expansion section and the contraction section at the end near the oxygen-enriched box 20 gradually decrease along the fluid flow direction of the spiral duct 303, while the inner diameters of the expansion section and the contraction section at the end away from the oxygen-enriched box 20 do not change.

[0066] In some embodiments, such as Figure 3 and Figure 5 As shown, the hollow fiber membrane bundle 302 is composed of multiple hollow fiber membrane filaments 3021. The multiple hollow fiber membrane filaments 3021 are all spirally wound around a central axis, so that the hollow fiber membrane filaments 3021 maintain a spiral extension configuration from the inside to the outside in the radial direction of the hollow fiber membrane bundle 302.

[0067] It is understandable that the first end of all hollow fiber membrane filaments 3021 connected to the air inlet box 10 is in a closed state, and the second end of all hollow fiber membrane filaments 3021 connected to the oxygen enrichment box 20 is in an open state, so that the oxygen in the hollow fiber membrane filaments 3021 can only flow into the oxygen enrichment box 20 through the second end.

[0068] In this way, the shape of the hollow fiber membrane bundle 302 can match the shape of the spiral air duct 303, making it easier for the gas in the spiral air duct 303 to contact the hollow fiber membrane filaments 3021 inside the hollow fiber membrane bundle 302, thereby maximizing the utilization of the membrane area of ​​the hollow fiber membrane bundle 302, improving gas mass transfer efficiency, and improving oxygen reduction efficiency.

[0069] The arrangement density of the hollow fiber membrane filaments 3021 in the hollow fiber membrane bundle 302 gradually increases along the fluid flow direction of the spiral air duct 303.

[0070] Therefore, the hollow fiber membrane filaments 3021 in the initial end (equivalent to the first end) of the hollow fiber membrane bundle 302 have a larger spacing to facilitate airflow entry, while the hollow fiber membrane filaments 3021 in the end (equivalent to the second end) are closely arranged to prevent airflow from taking shortcuts and ensure that airflow passes fully through the spiral air duct 303, thereby improving the overall oxygen reduction efficiency.

[0071] Furthermore, the density gradient design of the hollow fiber membrane filament 3021 and the spiral air duct 303 produce a strong synergistic effect:

[0072] Firstly, the flow field velocity is adaptive: at the initial end, the flow cross-sectional area of ​​the spiral duct 303 is relatively large, and the initial airflow velocity is moderate. When the airflow enters the high-density section at the end, the effective flow cross-sectional area of ​​the spiral duct 303 decreases because the hollow fiber membrane filaments 3021 occupy more space. Thus, according to the principle of fluid continuity, the airflow velocity will naturally increase.

[0073] Secondly, it creates an "acceleration-strong shear" effect: This design-induced increase in flow velocity means that at the end, the shearing force of the airflow on the outer surface of the hollow fiber membrane filament 3021 becomes the strongest, thereby preventing nitrogen in the air from lingering and accumulating near the hollow fiber membrane filament 3021.

[0074] In some embodiments, to ensure that the air intake box 10 can continuously draw air into the air intake cavity 101, such as Figure 3 As shown, the air intake box 10 is provided with an air intake cavity 101, which is connected to the corresponding end of the spiral air duct 303;

[0075] At least one gas delivery device 102 is provided on at least one outer side wall of the air intake box 10, and the gas delivery device 102 is used to draw external gas into the air intake cavity 101.

[0076] It should be noted that the gas conveying device 102 is preferably a fan or a blower, and the gas conveying device 102 is used to draw the gas from the outside (equivalent to the outside of the air inlet box 10, i.e., the compartment or drawer) into the air inlet cavity 101, and then flow into the spiral air duct 303 through the first air outlet 103.

[0077] This embodiment uses three gas conveying devices 102 as an example, and the three gas conveying devices 102 are arranged side by side in the vertical direction; of course, the number of gas conveying devices 102 can be selected according to the actual situation, and is not limited here.

[0078] In some embodiments, to ensure efficient and stable separation of oxygen-enriched gas and other gases (such as nitrogen-enriched gas), such as Figure 3 As shown, the oxygen-enriched box 20 is independently provided with a first inner cavity 201 and a second inner cavity 202;

[0079] The first inner cavity 201 communicates with the second end of the hollow fiber membrane bundle 302, and the first inner cavity 201 is used to collect the oxygen-enriched gas generated by the hollow fiber membrane bundle 302;

[0080] The second inner cavity 202 is connected to the corresponding end of the spiral duct 303, and the second inner cavity 202 is used to collect nitrogen-rich gas in the spiral duct 303.

[0081] It should be noted that the second inner cavity 202 is provided with a second air outlet 205 and an air inlet 206. In this way, the nitrogen-rich gas in the second inner cavity 202 is discharged back into the compartment or drawer through the second air outlet 205, while the nitrogen-rich gas in the spiral air duct 303 is transported into the second inner cavity 202 through the air inlet 206.

[0082] In this way, the first inner cavity 201 collects oxygen-rich gas and prevents it from being discharged back into the compartment or drawer, while the second inner cavity 202 collects nitrogen-rich gas and discharges it back into the compartment or drawer. This creates a low-oxygen, high-nitrogen gas environment in the compartment or drawer, which effectively inhibits the growth of microorganisms and oxidation reactions, and extends the shelf life of fresh produce (such as fruits, vegetables, and meat) in the compartment or drawer.

[0083] In some embodiments, such as Figure 3 As shown, the first inner cavity 201 is also connected to a vacuum pump 204 via a suction pipe 203. The vacuum pump 204 is used to discharge the oxygen-rich gas in the first inner cavity 201 to the outside.

[0084] In this way, when the vacuum pump 204 is started, the vacuum pump 204 will discharge the gas in the first inner cavity 201 to the outside of the refrigerator. At this time, the pressure in the hollow fiber membrane 3021 decreases, and oxygen dissolves, permeates and desorbs into the hollow fiber membrane 3021 under the action of pressure difference, thus accelerating the oxygen reduction efficiency.

[0085] In some embodiments, such as Figure 6 and Figure 7 As shown, this utility model also proposes a refrigerator, including a drawer, wherein the drawer is provided with an oxygen reduction device as described above.

[0086] It should be noted that the drawer in this embodiment can also be replaced with a compartment, which is not limited here.

[0087] The drawer consists of a drawer shell 40 and a drawer drawer 50, and the drawer drawer 50 can be pulled out relative to the drawer shell 40.

[0088] The oxygen reduction device is installed on the drawer outer shell 40 behind the drawer drawer 50 to reduce the space occupied in storage; the gas delivery device 102 and the second air outlet 205 are both connected to the inside of the drawer.

[0089] In this way, the gas delivery device 102 draws air (equivalent to feed gas) from inside the drawer into the air inlet cavity 101, and then flows into the spiral duct 303 through the first air outlet 103. The spiral duct 303 guides the feed gas to move in a rotating manner, extending the movement path of the feed gas and giving it tangential velocity, thereby forming a transverse sweeping motion on the outer surface of the hollow fiber membrane bundle 302. This continuously renews the feed gas in contact with the outer surface of the hollow fiber membrane bundle 302, improves the oxygen permeation driving force, and thus effectively prevents concentration polarization from forming on the outer surface of the hollow fiber membrane bundle 302, achieving high efficiency. Stable oxygen separation; simultaneously, vacuum pump 204 starts to reduce the pressure inside all hollow fiber membrane filaments 3021. Under the action of pressure difference, oxygen in the raw material gas dissolves, permeates, and desorbs into the inner cavity of hollow fiber membrane filaments 3021, forming oxygen-rich gas. The oxygen-rich gas then accumulates in the first inner cavity 201 and is extracted to the outside of the refrigerator by vacuum pump 204 through the extraction pipe 203. The deoxygenated raw material gas (such as nitrogen-rich gas) flows into the second inner cavity 202 through the air inlet 206. The nitrogen-rich gas in the second inner cavity 202 is then discharged back into the drawer through the second air outlet 205 (such as...). Figure 4 As shown in the figure, this creates a low-oxygen, high-nitrogen gas environment inside the drawer.

[0090] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. An oxygen-reducing device, characterized in that, include: A hollow fiber membrane assembly (30) is disposed between the air inlet box (10) and the oxygen enrichment box (20). The hollow fiber membrane assembly (30) consists of a shell (301) and a hollow fiber membrane bundle (302) located inside the shell (301). A spiral air duct (303) is formed between the outer surface of the hollow fiber membrane bundle (302) and the shell (301). The two ends of the spiral air duct (303) are respectively connected to the air inlet box (10) and the oxygen-enriching box (20); The first end of the hollow fiber membrane bundle (302) connected to the air inlet box (10) is in a closed state, and the second end of the hollow fiber membrane bundle (302) connected to the oxygen enrichment box (20) is in an open state.

2. The oxygen reduction device according to claim 1, characterized in that, The inner wall of the housing (301) is provided with a spiral guide (304), and a spiral air duct (303) is formed between the guide (304) and the outer surface of the hollow fiber membrane bundle (302).

3. The oxygen reduction device according to claim 1 or 2, characterized in that, The spiral duct (303) has a periodically changing corrugated structure along its axial direction, which is composed of alternating expansion and contraction sections. The inner diameter of the expansion section is larger than the inner diameter of the adjacent contraction section.

4. The oxygen reduction device according to claim 3, characterized in that, The inner diameters of both the expansion section and the contraction section gradually decrease along the fluid flow direction of the spiral duct (303).

5. The oxygen reduction device according to claim 1 or 2, characterized in that, The hollow fiber membrane bundle (302) is composed of multiple hollow fiber membrane filaments (3021), and the multiple hollow fiber membrane filaments (3021) are spirally wound around a central axis, so that the hollow fiber membrane filaments (3021) maintain a spiral extension configuration from the inside to the outside in the radial direction of the hollow fiber membrane bundle (302).

6. The oxygen reduction device according to claim 5, characterized in that, The arrangement density of the hollow fiber membrane filaments (3021) in the hollow fiber membrane bundle (302) gradually increases along the fluid flow direction of the spiral air duct (303).

7. The oxygen reduction device according to claim 1, characterized in that, The air intake box (10) is provided with an air intake cavity (101), which is connected to the corresponding end of the spiral air duct (303); At least one gas delivery device (102) is provided on at least one outer wall of the air intake box (10), and the gas delivery device (102) is used to draw external gas into the air intake cavity (101).

8. The oxygen reduction device according to claim 1, characterized in that, The oxygen-enriched box (20) is independently provided with a first inner cavity (201) and a second inner cavity (202); The first inner cavity (201) communicates with the second end of the hollow fiber membrane bundle (302), and the first inner cavity (201) is used to collect the oxygen-enriched gas generated by the hollow fiber membrane bundle (302); The second inner cavity (202) is connected to the corresponding end of the spiral duct (303), and the second inner cavity (202) is used to collect nitrogen-rich gas in the spiral duct (303).

9. The oxygen reduction device according to claim 8, characterized in that, The first inner cavity (201) is also connected to a vacuum pump (204) via a suction pipe (203), the vacuum pump (204) being used to discharge the oxygen-rich gas in the first inner cavity (201) to the outside.

10. A refrigerator, comprising drawers, characterized in that, The drawer is correspondingly provided with an oxygen reduction device as described in any one of claims 1 to 9.

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