Modified atmosphere fresh-keeping module and refrigeration equipment

Abstract

The invention discloses a modified atmosphere fresh-keeping module and refrigeration equipment. The modified atmosphere fresh-keeping module comprises a shell and a hollow fiber assembly arranged in the shell. An air adjusting cavity and an oxygen-enriched cavity which are isolated from each other are defined by the shell through a sealing structure; the main body part of the hollow fiber pipe is positioned in the air-conditioning cavity, and two ends of the hollow fiber pipe penetrate through the sealing structure and are opened in the oxygen-enriched cavity to form a turn-back layout which extends into the air-conditioning cavity from one side of the oxygen-enriched cavity and turns back. Two-way suction is achieved through the design that the openings in the two ends are arranged on the same side, the negative pressure transmission path is effectively shortened, pressure attenuation caused by slender tube cavities is compensated, and it is ensured that the high vacuum degree is maintained in the tube so as to provide uniform permeation driving force; the folded-back arrangement achieves a long physical length in a compact space, increases the effective ventilation area and the airflow contact probability of the hollow fiber pipe, achieves the cooperative balance of efficient separation and the compact space, and facilitates the flexible arrangement of the modified atmosphere fresh-keeping module in the narrow space of the refrigeration equipment.

Description

Technical Field

[0001] This application relates to a modified atmosphere preservation module, and more particularly to a refrigeration device having the modified atmosphere preservation module. Background Technology

[0002] As people's requirements for food preservation increase, modified atmosphere packaging technology is gradually being applied to refrigeration equipment (such as refrigerators). This technology typically utilizes the difference in the permeation rates of oxygen and nitrogen through hollow fiber tubes. By creating negative pressure on one side of the hollow fiber tubes, some of the oxygen in the air is extracted, thereby creating a low-oxygen, nitrogen-rich environment in the preservation chamber to slow down the oxidation and respiration of food.

[0003] Traditional hollow fiber tubes are typically arranged in a straight line, and to simplify packaging, one end of the hollow fiber tube is often sealed off while suction is only performed at the other end. This results in the hollow fiber tubes being too large in length, making it difficult to fit into the limited and irregular compartment space inside a refrigerator. Furthermore, due to the extremely thin diameter and long length of the hollow fiber tubes, there is a significant pressure loss when negative pressure is transmitted inside the tube, resulting in insufficient pressure in the tube far from the suction end, which prevents the formation of an effective osmotic pressure difference. This limits the effective length of a single hollow fiber tube and the overall separation efficiency.

[0004] Therefore, how to arrange longer hollow fiber tubes in a limited space and ensure that the long hollow fiber tubes can obtain uniform and sufficient suction force is the main challenge currently facing modified atmosphere preservation technology. Summary of the Invention

[0005] The purpose of this application is to provide a compact modified atmosphere preservation module and refrigeration equipment that can effectively improve separation efficiency.

[0006] To achieve the above-mentioned objectives, one embodiment of this application provides a modified atmosphere storage module, comprising:

[0007] The housing has an internal modified atmosphere chamber and an oxygen-enriched chamber, which are isolated from each other by a sealing structure. The modified atmosphere chamber has a vent for gas to flow through. A hollow fiber assembly includes several hollow fiber tubes. The main body of each hollow fiber tube is located inside the modified atmosphere chamber. Both ends of each hollow fiber tube penetrate the sealing structure and open into the oxygen-enriched chamber. The hollow fiber tube extends into the modified atmosphere chamber from one side of the oxygen-enriched chamber and turns back inside the modified atmosphere chamber.

[0008] As a further improvement of this application, the vent includes a gas inlet and a gas outlet disposed on the housing, the gas inlet, the gas conditioning chamber and the gas outlet being sequentially connected to form an airflow passage for gas flow, the airflow passage being configured to guide gas through the surface of the main body portion of the hollow fiber tube.

[0009] As a further improvement of this application, the hollow fiber tube has a reversal path within the modified atmosphere cavity. The reversal path extends alternately between a first reference plane, and / or a second reference plane, and / or between the first reference plane and the second reference plane. The first reference plane is parallel to the width direction of the housing, and the second reference plane is parallel to the height direction of the housing.

[0010] As a further improvement of this application, the hollow fiber assembly includes a multi-layered folded structure formed in a first reference plane, with adjacent layers of the hollow fiber tubes overlapping in the direction of the second reference plane.

[0011] As a further improvement of this application, the modified atmosphere preservation module further includes at least one fan located inside the modified atmosphere cavity, with the fan outlet facing the main body of the hollow fiber tube, driving the gas to form turbulence on the surface of the main body.

[0012] As a further improvement of this application, the oxygen-enriched cavity has several air outlets, which are connected to a vacuum pump to create a negative pressure inside the cavity of the hollow fiber tube.

[0013] As a further improvement of this application, the unfolded length of a single hollow fiber tube within the modified atmosphere chamber ranges from 0.5m to 2m.

[0014] As a further improvement of this application, the projection of the hollow fiber tube within the modified atmosphere cavity is U-shaped, serpentine, or spiral.

[0015] As a further improvement of this application, the sealing structure includes a sealing layer filled within the housing, and the connection points between the two ends and the main body are both embedded within the sealing layer.

[0016] To achieve one of the above-mentioned objectives, one embodiment of this application provides a refrigeration device, including a controlled atmosphere preservation module and a preservation chamber as described above; The fresh-keeping compartment is connected to the controlled atmosphere chamber via the vent, and the controlled atmosphere preservation module reduces the oxygen concentration in the fresh-keeping compartment; or, The fresh-keeping compartment is connected to the air outlet of the oxygen-enriched chamber, and the high-oxygen gas generated by the oxygen-enriched chamber is introduced into the fresh-keeping compartment.

[0017] Compared with commonly used technologies, this application has the following advantages: This modified atmosphere storage module achieves synergistic optimization of efficient separation and compact space by folding the hollow fiber tubes back within the modified atmosphere chamber and opening both ends into the oxygen-enriched chamber on the same side. This design, with both ends open and concentrated on the same side, allows the vacuum pump to simultaneously draw suction from both ends of a single hollow fiber tube through the oxygen-enriched chamber, greatly shortening the negative pressure transmission path within the tube and effectively compensating for the pressure attenuation caused by the long tube. This ensures that the interior of the long hollow fiber tube maintains an extremely high vacuum, thus providing a more powerful and uniform driving force for oxygen permeation. At the same time, the folded layout cleverly folds the relatively long hollow fiber tubes into a smaller projected space, significantly increasing the total surface area of ​​the hollow fiber tubes without reserving a long linear accommodating space. This not only improves the contact probability and gas exchange efficiency between the hollow fiber tubes and the airflow within the modified atmosphere chamber but also allows the high-efficiency modified atmosphere storage module to be flexibly embedded in various narrow gaps in refrigeration equipment, perfectly resolving the contradiction between performance improvement and space occupation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a modified atmosphere preservation module according to an embodiment of this application; Figure 2 This is a cross-sectional view of the modified atmosphere preservation module according to the first embodiment of this application; Figure 3 This is a cross-sectional view of the modified atmosphere preservation module according to the second embodiment of this application; Figure 4 This is a schematic diagram of the hollow fiber assembly according to the second embodiment of this application; Figure 5 This is a schematic diagram of the structure of the modified atmosphere preservation module according to the third embodiment of this application; Figure 6 This is a cross-sectional view of the modified atmosphere preservation module according to the third embodiment of this application; Figure 7 This is a schematic diagram of the structure connecting the modified atmosphere preservation module and the preservation chamber according to an embodiment of this application; Among them, 100 is the modified atmosphere preservation module; 10 is the shell; 11 is the modified atmosphere chamber; 12 is the oxygen-enriched chamber; 13 is the sealing structure; 14 is the air vent; 141 is the gas inlet; 142 is the gas outlet; 15 is the air outlet; 20 is the hollow fiber assembly; 21 is the hollow fiber tube; 211 is the main body; 212 is the end; 213 is the steering part; 30 is the fan; 40 is the vacuum pump; and 200 is the preservation compartment. Detailed Implementation

[0019] The present application will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present application, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of this application.

[0020] It should be understood that terms such as "above," "over," "below," and "below" used herein to indicate spatial relative position are for illustrative purposes to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The terms "spatial relative position" may be intended to include different orientations of the equipment in use or operation other than those shown in the figures.

[0021] One embodiment of this application provides a compact modified atmosphere storage module and refrigeration equipment that can effectively improve separation efficiency, thereby extending the shelf life of food by adjusting the gas composition of the storage environment (such as reducing or increasing the oxygen concentration).

[0022] The refrigeration equipment in this embodiment can be a refrigerator, freezer, commercial refrigerated cabinet, etc. The modified atmosphere preservation module 100 is usually installed inside the refrigeration equipment and is connected to the specific preservation compartment 200 of the refrigeration equipment.

[0023] The core working principle of the modified atmosphere storage module 100 is based on the selective permeability of the hollow fiber tube 21. Under the action of the vacuum pump 40, oxygen in the air, due to its faster permeation rate, preferentially passes through the tube wall of the hollow fiber tube 21 and is drawn away. The side that does not pass through the hollow fiber tube 21 is left with nitrogen-rich and low-oxygen air, thus separating oxygen from nitrogen. Nitrogen-rich gas or oxygen-rich gas is then introduced into the storage compartment 200 as needed to adjust the oxygen concentration. The following explanation mainly uses reducing the oxygen concentration in the storage compartment 200 as an example.

[0024] However, as described in the background section, the performance of hollow fiber tubes is severely limited by their physical form. Due to their extremely long and thin shape (diameter typically in the micrometer or millimeter range), significant frictional losses occur during negative pressure transmission within the tube. In traditional single-head suction structures, the end furthest from the suction pump often suffers from insufficient pressure compensation, leading to a substantial decrease in the utilization rate of long hollow fiber tubes. Shortening the hollow fiber tube to ensure efficiency results in insufficient total ventilation area. This application completely solves this performance bottleneck through a novel "same-side foldback, double-end suction" layout.

[0025] like Figure 1 and 2 As shown, a modified atmosphere preservation module 100 of this embodiment includes a housing 10 and a hollow fiber assembly 20.

[0026] The interior of the housing 10 is divided into two independent, non-ventilated spaces by a sealing structure 13: a controlled atmosphere chamber 11 and an oxygen-enriched chamber 12. The controlled atmosphere chamber 11 serves as the main channel for gas flow and is equipped with a vent 14 for gas exchange with the preservation chamber 200 or the external environment. The oxygen-enriched chamber 12 is located adjacent to the controlled atmosphere chamber 11 and serves as a negative pressure collection chamber for collecting and discharging high-oxygen gas.

[0027] The modified atmosphere chamber 11 and the oxygen-enriched chamber 12 are physically isolated by a sealing structure 13, ensuring that only gas that permeates through the wall of the hollow fiber tube 21 can enter the oxygen-enriched chamber 12.

[0028] The hollow fiber assembly 20 includes several hollow fiber tubes 21. The main body 211 of the hollow fiber tube 21 is located in the modified atmosphere chamber 11. Both ends 212 of the hollow fiber tube 21 pass through the sealing structure 13 and open into the oxygen-enriched chamber 12. The hollow fiber tube 21 extends into the modified atmosphere chamber 11 from one side of the oxygen-enriched chamber 12 and turns and returns in the modified atmosphere chamber 11.

[0029] like Figure 2 As shown, the hollow fiber tube 21 extends from the end 212 located in the oxygen-enriched cavity 12 through the sealing structure 13 into the modified atmosphere cavity 11. After extending a certain distance inside the modified atmosphere cavity 11, it bends several times through the turning part 213, returns, and passes through the sealing structure 13 again, returning to the oxygen-enriched cavity 12 on the starting side.

[0030] Compared to the traditional one-end open structure, where negative pressure is transmitted from one end of the hollow fiber tube 21 to the other, the resistance inside the tube increases sharply with length, causing the distal end to almost lose its permeation driving force. This application addresses this by opening both ends of the hollow fiber tube 21 into the oxygen-enriched chamber 12, allowing the vacuum pump 40 to simultaneously apply negative pressure to both ends of the single tube through the oxygen-enriched chamber 12. The negative pressure converges from both ends to the middle, directly halving the furthest negative pressure transmission distance within the single tube. This significantly compensates for the pressure attenuation caused by the slender tube length, ensuring that the entire hollow fiber tube 21 maintains a uniform and extremely high vacuum throughout its entire length, thus significantly improving the oxygen reduction efficiency of the hollow fiber tube 21.

[0031] Furthermore, the internal space of refrigeration equipment is extremely valuable. This application, through the folding design of the turning part 213, compresses the hollow fiber tube 21 (e.g., more than 1 meter) that originally required an extra-long accommodating space into a shorter shell 10. Without increasing the external dimensions of the modified atmosphere preservation module 100, the surface area of ​​the hollow fiber tube 21 participating in air exchange is multiplied. At the same time, this layout eliminates the need to reserve complex air extraction pipe interfaces on both sides of the modified atmosphere preservation module 100. All air extraction paths are integrated on the oxygen-enriching chamber 12 side, greatly optimizing the installation flexibility of the modified atmosphere preservation module 100, allowing it to be flexibly embedded in corner positions within the refrigeration equipment.

[0032] In one embodiment, such as Figure 1 As shown, the vent 14 includes a gas inlet 141 and a gas outlet 142 disposed on the housing 10. The gas inlet 141, the atmosphere conditioning chamber 11 and the gas outlet 142 are connected in sequence to form an airflow passage for gas flow. The airflow passage is configured to guide the gas through the surface of the main body portion 211 of the hollow fiber tube 21.

[0033] As oxygen continuously permeates into the hollow fiber tube 21 during operation, a layer of nitrogen gas with extremely high concentration rapidly accumulates on the outer wall of the hollow fiber tube 21, forming a "concentration polarization" phenomenon. This nitrogen layer acts like an invisible wall, blocking subsequent oxygen from contacting the surface of the hollow fiber tube 21, resulting in a significant decrease in the permeation driving force. In this embodiment, the gas inlet 141, the controlled atmosphere chamber 11, and the gas outlet 142, connected in sequence, force the gas to sweep across the surface of the hollow fiber tube 21 at high speed under dynamic action. Through shearing action, the nitrogen layer accumulated on the surface of the hollow fiber tube 21 is continuously stripped away and diluted, maintaining an extremely high oxygen osmotic pressure difference and improving the ventilation efficiency.

[0034] In one embodiment, the hollow fiber tube 21 has a reversal path within the modified atmosphere cavity 11. The reversal path extends alternately between a first reference plane, and / or a second reference plane, and / or between the first and second reference planes. The first reference plane is parallel to the width direction of the housing 10, and the second reference plane is parallel to the height direction of the housing 10.

[0035] Taking the turning back within the first reference plane as an example: Figure 2 As shown, the hollow fiber tube 21 is folded horizontally, which is suitable for scenarios where the height is limited but the width is relatively large, such as the relatively flat space above a drawer. The hollow fiber tube 21 is distributed in a flat shape in the horizontal plane, which not only ensures the unfolded length, but also compresses the vertical height of the hollow fiber assembly 20 to the maximum extent.

[0036] Taking the folding back in the second reference plane as an example: the hollow fiber tube 21 folds back vertically, which is suitable for scenarios where the lateral direction is limited but the height is sufficient, such as the narrow space on the side of a drawer. The extension and rotation of the hollow fiber tube 21 in the vertical direction utilizes the height to obtain a larger surface area.

[0037] Taking simultaneous folding within both the first and second reference planes as an example: the hollow fiber tube 21 simultaneously extends and shuttles alternately between the first and second reference planes, such as... Figure 3 and 4 As shown, the hollow fiber tube 21 folds back twice in the first reference plane and once in the second reference plane, thus enabling the insertion of an ultra-long hollow fiber tube 21 into a very small volume and improving space utilization.

[0038] In one embodiment, the hollow fiber assembly 20 includes a multi-layered folded structure formed in a first reference plane, with two adjacent layers of hollow fiber tubes 21 overlapping in the direction of the second reference plane.

[0039] like Figure 2 and 6 As shown, this embodiment breaks the upper limit of the ventilation capacity of a single-layer hollow fiber tube 21. Adjacent layers of hollow fiber tubes 21 can be configured to be independent or interconnected according to flow requirements. Through this vertical stacking, each layer of hollow fiber tubes 21 can act as an independent ventilation unit in contact with the airflow. Furthermore, due to the extremely small gaps between layers, the airflow is forced between adjacent layers of hollow fiber tubes 21, enhancing the "scouring effect" of the airflow. This embodiment increases the density of hollow fiber tubes 21 per unit projected area by several times, allowing for more hollow fiber tubes 21 to be accommodated per unit area, thus improving ventilation efficiency.

[0040] In one embodiment, the modified atmosphere preservation module 100 further includes at least one fan 30 located inside the modified atmosphere cavity 11, with the air outlet of the fan 30 facing the main body portion 211 of the hollow fiber tube 21, driving the gas to form turbulence on the surface of the main body portion 211.

[0041] like Figure 3 and 4 As shown, this multi-layered structure can also be formed by folding a hollow fiber tube 21 multiple times.

[0042] On the one hand, the fan 30 serves as an active power source, driving the gas to circulate between the controlled atmosphere chamber 11 and the preservation chamber 200; on the other hand, the fan 30 can force the formation of a high-speed airflow on the surface of the hollow fiber tube 21. Because the hollow fiber tube 21 adopts a zigzag layout, when the high-speed airflow impacts the main body 211 of the hollow fiber tube 21, especially when it impacts the curved zigzag section formed by the zigzag, the laminar flow state of the airflow will be broken, thereby generating strong local turbulence on the surface of the hollow fiber tube 21.

[0043] Turbulence acts like an invisible brush, frequently stripping nitrogen molecules adsorbed on the surface of the hollow fiber tube 21, facilitating the rapid entry of oxygen molecules into the tube. Through the synergistic effect of the fan 30's airflow and the deflection structure, this application physically alters the concentration polarization environment on the surface of the hollow fiber tube 21, achieving an extremely high oxygen separation rate and significantly extending the preservation efficiency of the refrigeration equipment.

[0044] In one embodiment, the oxygen-enriched chamber 12 has a plurality of air outlets 15, which are connected to a vacuum pump 40 to create a negative pressure inside the cavity of the hollow fiber tube 21.

[0045] When the vacuum pump 40 starts, a stable negative pressure environment is quickly formed in the oxygen-enriched chamber 12 due to the direct connection between the outlet 15 and the oxygen-enriched chamber 12. Since both ends of all the hollow fiber tubes 21 are open into the oxygen-enriched chamber 12, this negative pressure is instantly and synchronously transmitted to the interior of hundreds or thousands of tiny hollow fiber tubes 21, greatly simplifying the internal structure of the modified atmosphere preservation module 100 and ensuring extreme pressure balance among the hollow fiber tubes 21. Under the continuous action of the vacuum pump 40, a stable pressure gradient is formed inside and outside the hollow fiber tubes 21, driving oxygen to continuously permeate into the interior of the chamber from one side of the modified atmosphere chamber 11 through the hollow fiber tubes 21. Through this centralized negative pressure management, this application effectively reduces the risk of system leakage and ensures the performance consistency of the large-scale hollow fiber assembly 20 under long-term operation.

[0046] Both the air outlet 15 and the vacuum pump 40 can be equipped with one or more, such as Figure 1-3 The diagram shows the structure of an outlet 15 and a vacuum pump 40. Figure 5 and Figure 6 The diagram shows a structure with two outlets 15 and two vacuum pumps 40. Alternatively, it could be a structure with two outlets 15 and one vacuum pump 40, or a structure with more outlets 15 and more vacuum pumps 40.

[0047] In one embodiment, the unfolded length of a single hollow fiber tube 21 within the modified atmosphere chamber 11 ranges from 0.5m to 2m.

[0048] The minimum length of 0.5m ensures that a single hollow fiber tube 21 has sufficient length and surface area to achieve the preset oxygen-nitrogen separation target. If the length is lower than this threshold, the number of hollow fiber tubes 21 must be significantly increased to achieve the same oxygen reduction rate, which would lead to an exponential increase in the difficulty of the encapsulation process.

[0049] The upper limit of 2m effectively controls the pressure loss along the tube. Since the hollow fiber tube 21 is a micro-capillary structure, using the double-end suction method mentioned above is equivalent to replacing the conventional 1m tube with a 2m tube. However, if the length continues to increase, the negative pressure value in the middle section of the tube will also be severely reduced due to excessive resistance.

[0050] Therefore, by setting the length of the hollow fiber tube 21 within the range of 0.5m to 2m, and in conjunction with the unique folding structure of this application, it is ensured that the module has an extremely high air exchange flux, and that the energy of the vacuum pump 40 can be efficiently converted into permeation driving force, so that the modified atmosphere preservation module 100 can achieve rapid adjustment of the environment of the preservation chamber 200 with a very small volume.

[0051] In one embodiment, the projection of the hollow fiber tube 21 within the modified atmosphere cavity 11 is U-shaped, serpentine, or spiral.

[0052] U-shaped arrangement, such as Figure 2 and 6 As shown, the bending stress distribution of the single hollow fiber tube 21 is uniform, which avoids excessive mechanical fatigue at the turning point, and at the same time, it enables the airflow to generate a stable flow direction deflection when passing through the bottom of the U-shape, thereby enhancing the local mass transfer efficiency.

[0053] The serpentine arrangement involves multiple U-shaped back-and-forth turns. The serpentine structure achieves an extremely long effective unfolding length within an extremely narrow width and increases the "collision number" of the airflow, allowing gas molecules to have sufficient contact and heat and mass exchange with the surface of the hollow fiber tube 21. It is particularly suitable for the miniature modified atmosphere preservation module 100, which has extremely high requirements for compactness.

[0054] The spiral shape allows the hollow fiber tubes 21 to be distributed centripetally or centrifugally, achieving extremely high packing density within the circular or square cavity. The spiral path causes the airflow to form a cyclone-like trajectory within the cavity, extending the residence time of the gas between the hollow fiber tubes 21 and improving the oxygen removal rate per cycle.

[0055] In one embodiment, the sealing structure 13 includes a sealing layer filled within the housing 10, and the connection points between the two ends 212 of the hollow fiber tube 21 and the main body portion 211 are both embedded within the sealing layer.

[0056] The embedded sealing design involves arranging the ends 212 of multiple hollow fiber tubes 21 neatly in a mold during manufacturing, followed by the injection of liquid sealing material. After curing, the sealing layer adheres tightly to the inner wall of the housing 10 and the outer wall of the hollow fiber tubes 21.

[0057] This achieves absolute physical isolation, preventing the gas to be treated in the controlled atmosphere chamber 11 from entering the oxygen-enriched chamber 12 except through the hollow fiber tube 21, thus ensuring the high purity of the oxygen reduction. On the other hand, it facilitates production and achieves mechanical stability. Under the high-intensity negative pressure suction generated by the vacuum pump 40 or the high-frequency vibration environment brought by the fan 30, the end 212 of the slender hollow fiber tube 21 will not loosen, retract, or fatigue break, ensuring the structural stability of the module during the long operating life of the refrigeration equipment.

[0058] In one embodiment, this application provides a refrigeration device, including the modified atmosphere preservation module 100 and the preservation chamber 200 as described above; The fresh food compartment 200 is connected to the modified atmosphere chamber 11 through the vent 14, and the modified atmosphere preservation module 100 reduces the oxygen concentration in the fresh food compartment 200; or, the fresh food compartment 200 is connected to the vent 15 of the oxygen-enriched chamber 12, and the high oxygen gas generated by the oxygen-enriched chamber 12 is introduced into the fresh food compartment 200.

[0059] Taking low-oxygen preservation as an example, the preservation chamber 200 is connected to the controlled atmosphere chamber 11 via the ventilation port 14. When the controlled atmosphere preservation module 100 is activated, the fan 30 drives the air in the chamber to circulate within the controlled atmosphere chamber 11, where oxygen continuously permeates through the walls of the hollow fiber tube 21 and is drawn away. As the circulation continues, the oxygen concentration in the preservation chamber 200 rapidly decreases, thus creating a low-oxygen, nitrogen-rich environment that inhibits plant respiration and slows down oxidative decay. This mode can significantly extend the shelf life of oxygen-sensitive ingredients such as vegetables and fruits.

[0060] Taking high-oxygen preservation applications as an example, the preservation chamber 200 can also be connected to the air outlet 15 of the oxygen-enriched chamber 12. In this mode, oxygen-enriched gas, with a concentration significantly higher than that of air, is drawn from the hollow fiber tube 21 by the vacuum pump 40 and directionally introduced into the specific preservation chamber 200. This high-oxygen environment has unique value in certain specific preservation scenarios, such as maintaining the vibrancy of certain flowers or utilizing the antibacterial properties of high-concentration oxygen to treat specific ingredients.

[0061] The modified atmosphere preservation module 100 of this application can achieve low-oxygen preservation or high-oxygen regulation by switching the gas path according to different storage needs, which greatly improves the intelligence of refrigeration equipment and the user experience.

[0062] Compared with commonly used technologies, this embodiment has the following advantages: The modified atmosphere storage module 100 achieves a synergistic optimization of efficient separation and compact space by folding the hollow fiber tube 21 within the modified atmosphere chamber 11 and opening both ends 212 of it into the oxygen-enriched chamber 12 on the same side. This design, with both ends open and concentrated on the same side, allows the vacuum pump 40 to simultaneously pump from both ends of a single hollow fiber tube 21 through the oxygen-enriched chamber 12. This significantly shortens the negative pressure transmission path within the tube and effectively compensates for the pressure attenuation caused by the long and narrow tube. It ensures that a very high vacuum is maintained within the long hollow fiber tube 21, thus providing a more powerful and uniform driving force for oxygen permeation. At the same time, the folded layout cleverly folds the relatively long hollow fiber tube 21 into a smaller projected space, significantly increasing the total surface area of ​​the hollow fiber tube 21 without reserving a long straight accommodating space. This not only improves the contact probability and ventilation efficiency between the hollow fiber tube 21 and the airflow in the controlled atmosphere cavity 11, but also allows the high-efficiency controlled atmosphere preservation module 100 to be flexibly embedded in various narrow gaps of the refrigeration equipment, perfectly solving the contradiction between performance improvement and space occupation.

[0063] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0064] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application, and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the specific spirit of this application should be included within the scope of protection of this application.

Claims

1. A modified atmosphere storage module (100), characterized in that, include: The housing (10) has a modified atmosphere chamber (11) and an oxygen-enriched chamber (12) inside. The modified atmosphere chamber (11) and the oxygen-enriched chamber (12) are isolated from each other by a sealing structure (13). The modified atmosphere chamber (11) has a vent (14) for gas to flow through. The hollow fiber assembly (20) includes a plurality of hollow fiber tubes (21). The main body (211) of the hollow fiber tube (21) is located in the modified atmosphere chamber (11). Both ends (212) of the hollow fiber tube (21) penetrate the sealing structure (13) and open into the oxygen-enriched chamber (12). The hollow fiber tube (21) extends into the modified atmosphere chamber (11) from one side of the oxygen-enriched chamber (12) and turns and returns in the modified atmosphere chamber (11).

2. The modified atmosphere storage module (100) according to claim 1, characterized in that, The vent (14) includes a gas inlet (141) and a gas outlet (142) disposed on the housing (10). The gas inlet (141), the gas conditioning chamber (11) and the gas outlet (142) are connected in sequence to form an airflow passage for gas flow. The airflow passage is configured to guide gas through the surface of the main body (211) of the hollow fiber tube (21).

3. The modified atmosphere storage module (100) according to claim 1, characterized in that, The hollow fiber tube (21) has a reversal path in the modified atmosphere cavity (11), the reversal path being located in a first reference plane and / or a second reference plane and / or extending alternately between the first reference plane and the second reference plane, the first reference plane being parallel to the width direction of the housing (10), and the second reference plane being parallel to the height direction of the housing (10).

4. The modified atmosphere storage module (100) according to claim 3, characterized in that, The hollow fiber assembly (20) includes a multi-layered folded structure formed in a first reference plane, with two adjacent layers of hollow fiber tubes (21) overlapping in the direction of the second reference plane.

5. The modified atmosphere storage module (100) according to claim 1, characterized in that, The modified atmosphere preservation module (100) also includes at least one fan (30), which is located inside the modified atmosphere cavity (11). The air outlet of the fan (30) faces the main body (211) of the hollow fiber tube (21), driving the gas to form turbulence on the surface of the main body (211).

6. The modified atmosphere storage module (100) according to claim 1, characterized in that, The oxygen-enriched chamber (12) has several air outlets (15), which are connected to a vacuum pump (40) to create a negative pressure inside the cavity of the hollow fiber tube (21).

7. The modified atmosphere storage module (100) according to claim 1, characterized in that, The unfolded length of a single hollow fiber tube (21) within the modified atmosphere chamber (11) ranges from 0.5m to 2m.

8. The modified atmosphere storage module (100) according to claim 1, characterized in that, The hollow fiber tube (21) is projected in the modified atmosphere cavity (11) in a U-shape, serpentine shape, or spiral shape.

9. The modified atmosphere storage module (100) according to claim 1, characterized in that, The sealing structure (13) includes a sealing layer filled within the housing (10), and the connection points between the two ends (212) and the main body (211) are both embedded within the sealing layer.

10. A refrigeration device, characterized in that, Includes the modified atmosphere storage module (100) and the storage compartment (200) as described in any one of claims 1 to 9; The fresh-keeping compartment (200) is connected to the modified atmosphere chamber (11) through the vent (14), and the modified atmosphere preservation module (100) reduces the oxygen concentration in the fresh-keeping compartment (200); or, The fresh-keeping compartment (200) is connected to the air outlet (15) of the oxygen-enriched chamber (12), and the high-oxygen gas generated by the oxygen-enriched chamber (12) is introduced into the fresh-keeping compartment (200).

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