Modified atmosphere fresh-keeping module and refrigeration equipment

Abstract

The invention discloses an air-conditioning fresh-keeping module and refrigeration equipment. The air-conditioning fresh-keeping module comprises a shell assembly, and the interior of the shell assembly is divided into an air inlet cavity, an air-conditioning cavity and an exhaust cavity which are sequentially arranged in the length direction through a sealing structure; the main body part of the hollow fiber membrane module is arranged in the air adjusting cavity, and the air inlet end and the air outlet end of the hollow fiber membrane module are opened in the air inlet cavity and the air outlet cavity respectively; the air inlet mechanism communicates with the air inlet cavity or the exhaust cavity, and the air exhaust mechanism communicates with the air exhaust opening of the air adjusting cavity. According to the modified atmosphere fresh-keeping module, the air inlet flow is configured to be 5-15 times of the air exhaust flow, a high-speed updating flow field is constructed in the hollow fiber pipe, it is ensured that oxygen partial pressure sufficient to generate osmotic pressure difference is still maintained when air flow advances to the far end, efficient utilization of a membrane module in the full-length range is achieved, and on the premise of not depending on ultrahigh-pressure driving, the service life of the membrane module is prolonged. The oxygen permeation flux, the operation stability and the energy efficiency ratio are greatly improved, and the fresh-keeping effect of the refrigeration equipment is remarkably enhanced.

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] However, the inventors discovered that existing modified atmosphere storage modules face a serious bottleneck in mass transfer efficiency in practical applications:

[0004] Because hollow fiber tubes have extremely small inner diameters (usually in the micrometer range) and long pipe lengths, if the flow rate provided by the air intake mechanism is not properly matched with the permeation rate of the air extraction mechanism, a large amount of oxygen in the air will be extracted from the front section of the tube, resulting in a significant "oxygen depletion" phenomenon in the rear section of the tube, causing the rear half of the hollow fiber tube to essentially lose its separation function.

[0005] In addition, a high concentration of nitrogen molecules easily accumulates near the surface of the inner wall of the hollow fiber tube, forming a concentration polarization barrier. This not only increases the permeation resistance but also severely weakens the oxygen partial pressure gradient across the membrane, resulting in the overall oxygen production efficiency of the module being far lower than the theoretical value.

[0006] These issues, in turn, limit the overall oxygen regulation performance of the modified atmosphere storage module and the preservation effect of the refrigeration equipment. Summary of the Invention

[0007] The purpose of this application is to provide a modified atmosphere preservation module that improves oxygen regulation performance, and a refrigeration device having the modified atmosphere preservation module.

[0008] To achieve the above-mentioned objectives, one embodiment of this application provides a modified atmosphere storage module, comprising: The housing assembly is internally divided by a sealed structure into an air intake chamber, a controlled atmosphere chamber, and an exhaust chamber arranged sequentially along the length direction, wherein the controlled atmosphere chamber is provided with an air extraction port; A hollow fiber membrane module includes several hollow fiber tubes, the main body of which is disposed in the modified atmosphere chamber, the air inlet end of which opens into the air inlet chamber, and the air outlet end of which opens into the air outlet chamber. An air intake mechanism, wherein its air outlet is connected to the air intake chamber, or its air inlet is connected to the exhaust chamber; An air extraction mechanism is connected to the air extraction port, and the air intake flow rate driven by the air intake mechanism is configured to be 5 to 15 times the air extraction flow rate generated by the air extraction mechanism.

[0009] As a further improvement of this application, the air intake mechanism includes a first fan, which is disposed in the air intake cavity, and the air outlet direction of the first fan is parallel to the extension direction of the hollow fiber tube.

[0010] As a further improvement of this application, the cross-sectional area of ​​the air intake chamber is larger than the cross-sectional area of ​​the controlled atmosphere chamber; the first fan is an axial flow fan.

[0011] As a further improvement of this application, the housing assembly includes a fan bracket and a cylinder, the fan bracket is fixedly connected to the cylinder, the fan bracket fixes the first fan, the fan bracket encloses the air inlet chamber, and the cylinder encloses the air conditioning chamber and the exhaust chamber.

[0012] As a further improvement of this application, a first support grid is provided at the end of the cylinder near the fan bracket, and a second support grid is provided inside the cylinder. Both the first support grid and the second support grid are provided with multiple honeycomb holes. The hollow fiber tube passes through the honeycomb holes of the first support grid and the honeycomb holes of the second support grid in sequence. The first support grid and the second support grid support and position the hollow fiber membrane assembly.

[0013] As a further improvement of this application, the total cross-sectional area of ​​the main body in the modified atmosphere cavity accounts for 30% to 60% of the cross-sectional area of ​​the modified atmosphere cavity, the diameter of the hollow fiber tube ranges from 200µm to 400µm, and there is an air exchange gap between adjacent hollow fiber tubes for airflow to pass through.

[0014] As a further improvement of this application, the sealing structure includes a first sealing layer and a second sealing layer disposed at both ends of the modified atmosphere chamber, wherein the connection between the air inlet end and the main body is embedded in the first sealing layer, and the connection between the exhaust end and the main body is embedded in the second sealing layer.

[0015] To achieve one of the above-mentioned objectives, one embodiment of this application provides a refrigeration device, including a first preservation chamber and the aforementioned modified atmosphere preservation module, wherein the air inlet chamber and the air outlet chamber of the modified atmosphere preservation module are both connected to the first preservation chamber.

[0016] As a further improvement of this application, the refrigeration equipment further includes a second preservation compartment, and the air extraction mechanism is connected to the second preservation compartment to introduce oxygen-enriched gas extracted from the modified atmosphere chamber into the second preservation compartment.

[0017] As a further improvement of this application, the refrigeration equipment further includes a second fan disposed in the first preservation chamber, the second fan guiding the airflow in the first preservation chamber toward the air intake chamber.

[0018] Compared with commonly used technologies, this application has the following beneficial effects: By configuring the air intake flow rate to be 5 to 15 times the exhaust flow rate, this modified atmosphere preservation module constructs a high-speed renewal flow field inside the hollow fiber tube that far exceeds the permeation rate. This flow ratio ensures that even when the airflow travels to the vicinity of the exhaust chamber at the far end of the hollow fiber tube, the oxygen partial pressure inside the tube can still be maintained at a level sufficient to generate an osmotic pressure difference, thus achieving efficient utilization of the hollow fiber membrane module over its entire length. Furthermore, the tangential shear force generated by the high-speed flow field can continuously and efficiently "strip" the nitrogen accumulation layer attached to the inner wall of the hollow fiber tube, updating the gas concentration gradient at the inner wall interface in real time. This significantly reduces the resistance of oxygen molecules permeating through the membrane wall, greatly improving the oxygen permeation flux of the modified atmosphere module without relying on ultra-high pressure drive, significantly improving the operational stability and energy efficiency ratio of the modified atmosphere preservation module, and enhancing the preservation effect of the refrigeration equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure connecting the modified atmosphere preservation module and the first preservation chamber according to the first embodiment of this application; Figure 2 This is a schematic diagram of the structure of a modified atmosphere preservation module according to an embodiment of this application; Figure 3 This is a cross-sectional view of a modified atmosphere preservation module according to an embodiment of this application; Figure 4 This is an exploded view of a modified atmosphere preservation module according to an embodiment of this application. Figure 5 This is an exploded view of a modified atmosphere preservation module according to an embodiment of this application from another perspective; Figure 6 This is a schematic diagram of the structure of the modified atmosphere preservation module in the second embodiment of this application, which is connected to the first preservation chamber and the second preservation chamber respectively. Among them, 100 is the modified atmosphere preservation module; 10 is the shell assembly; 101 is the cylinder; 102 is the fan bracket; 11 is the air inlet chamber; 12 is the modified atmosphere chamber; 13 is the exhaust chamber; 14 is the air extraction port; 15 is the sealing structure; 151 is the first sealing layer; 152 is the second sealing layer; 161 is the first support grid; 162 is the second support grid; 163 is the honeycomb hole; 20 is the hollow fiber membrane assembly; 21 is the hollow fiber tube; 211 is the air inlet end; 212 is the main body; 213 is the exhaust end; 30 is the air inlet mechanism; 30a is the first fan; 40 is the air extraction mechanism; 200 is the first preservation chamber; 300 is the second preservation chamber; 400 is the second fan. Detailed Implementation

[0020] 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.

[0021] It should be understood that terms such as “above,” “over,” “below,” and “under” 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.

[0022] One embodiment of this application provides a modified atmosphere storage module for improving oxygen regulation performance, and a refrigeration device having the modified atmosphere storage module, which extends the shelf life of food by adjusting the gas composition of the storage environment (such as reducing or increasing the oxygen concentration).

[0023] 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 a specific preservation compartment of the refrigeration equipment.

[0024] 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 air extraction mechanism 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 extracted. 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 as needed to adjust the oxygen concentration. The following explanation mainly uses reducing the oxygen concentration in the storage compartment as an example.

[0025] As described in the background section, existing modified atmosphere packaging (MAP) technologies face severe efficiency bottlenecks in actual operation. Although they can achieve oxygen-nitrogen separation to a certain extent, the extremely fine lumen of the hollow fiber tube 21 causes oxygen to rapidly permeate away as the airflow travels through the long pipeline, leading to oxygen depletion in the latter part of the pipeline. The latter half of the hollow fiber tube 21 essentially loses its separation function. Furthermore, due to the flow rate being limited by the compressor displacement, a thick nitrogen accumulation layer forms near the surface of the inner wall of the tube, a phenomenon known as "concentration polarization," which increases permeation resistance. This application aims to overcome this bottleneck by reconstructing the layout of the MAP module 100 and precisely anchoring the ratio of inlet to outlet air flow.

[0026] The modified atmosphere preservation module 100 in this embodiment is as follows: Figure 1 As shown, it includes a housing assembly 10, a hollow fiber membrane module 20, an air intake mechanism 30, and an air extraction mechanism 40.

[0027] The interior of the housing assembly 10 is divided by a sealing structure 15 into an air intake chamber 11, a modified atmosphere chamber 12 and an exhaust chamber 13 arranged sequentially along the length direction. The modified atmosphere chamber 12 is provided with an air extraction port 14.

[0028] The gas first enters the intake chamber 11 for pressure stabilization, then enters the controlled atmosphere chamber 12 for nitrogen and oxygen separation, and finally the unpermeated nitrogen gas gathers in the exhaust chamber 13 for discharge. In this way, the airflow can obtain stable pressure buffer before and after entering the micro hollow fiber tube 21, preventing airflow turbulence caused by abrupt changes in the flow channel.

[0029] The hollow fiber membrane module 20 includes a plurality of hollow fiber tubes 21. The main body 212 of the hollow fiber tube 21 is disposed in the atmosphere-controlled chamber 12. The air inlet end 211 of the hollow fiber tube 21 opens into the air inlet chamber 11, and its exhaust end 213 opens into the exhaust chamber 13. That is, the two ends of the hollow fiber tube 21 are respectively connected to the air inlet chamber 11 and the exhaust chamber 13.

[0030] The air outlet of the air intake mechanism 30 is connected to the air intake chamber 11, or the air inlet of the air intake mechanism 30 is connected to the exhaust chamber 13.

[0031] The suction mechanism 40 is connected to the suction port 14, and the intake flow rate driven by the intake mechanism 30 is configured to be 5 to 15 times the suction flow rate generated by the suction mechanism 40.

[0032] In this embodiment, the performance parameters of the air intake mechanism 30 (such as a fan, air pump, etc.) and the air extraction mechanism 40 (such as a vacuum pump) are matched to ensure that the flow rate ratio falls within the range defined in this application. For example: Based on the inner diameter, length, and number of hollow fiber tubes 21 and the vacuum negative pressure intensity of the controlled atmosphere chamber 12, the theoretical maximum permeation flux of the hollow fiber membrane module 20 under full-load conditions is pre-calculated. Subsequently, an air intake fan with a rated volumetric flow rate of 5 to 15 times this permeation flux is selected. For example, when the air intake flow rate driven by the air intake mechanism 30 is configured to be more than 10 times the air extraction flow rate generated by the air extraction mechanism 40, if an oxygen-enriched permeation flow rate of 0.4 L / min is used, the air intake flow rate provided by the air intake mechanism 30 shall not be less than 4 L / min.

[0033] Taking the air intake mechanism 30 as an example, the speed can be dynamically adjusted by regulating the motor's duty cycle (PWM) or input voltage. During operation, a flow sensor is installed at the air intake port 14 to monitor the real-time permeation rate. The control unit of the modified atmosphere preservation module 100 adjusts the speed of the air intake fan in real time based on this feedback signal. When the preservation demand increases or the vacuum level increases, leading to an increase in permeation, the air intake fan speeds up synchronously to ensure that the air intake flow rate is always maintained at 5 to 15 times the permeation flow rate, thereby dynamically controlling the concentration gradient distribution of nitrogen and oxygen separation.

[0034] This application specifies this particular flow rate ratio, which is not a random selection of the value, but rather a deep optimization based on the mass transfer characteristics of the modified atmosphere storage module 100 in a microscale space. Its technical necessity includes: Suppressing the oxygen depletion effect throughout the entire process. When air flows inside the hollow fiber tube 21, due to its extremely small volume, oxygen in the airflow is easily and rapidly extracted at the beginning. Experiments have shown that if the inlet flow rate is less than 5 times the permeation flow rate, the oxygen partial pressure in the later part of the tube decreases significantly, weakening the oxygen permeation effect and significantly reducing the separation efficiency of the hollow fiber tube 21. By maintaining a flow ratio of more than 5 times, it is ensured that the oxygen partial pressure in the tube is always maintained at a level sufficient to generate effective permeation driving force before the airflow reaches the exhaust chamber 13. This achieves efficient utilization of the hollow fiber membrane module 20 along its entire length, ensuring that even when the airflow reaches the end of the hollow fiber tube 21 (near the exhaust chamber 13), the oxygen concentration in the tube still meets the requirements for nitrogen-oxygen separation. This maintains a high oxygen partial pressure gradient throughout the entire length of the hollow fiber tube 21, solving the problem of significant performance degradation caused by oxygen depletion at the end of long tubes in existing technologies.

[0035] Shear force dynamically refreshes the concentration polarization layer. When the flow rate increases to about 10 times the permeation velocity, the airflow forms a dynamic flow field with a specific Reynolds number within the micro-cavity. The tangential shear force generated by this high-speed airflow continuously peels away the nitrogen-enriched layer (i.e., the concentration polarization layer) adhering to the inner wall of the tube, forcibly renewing the concentration distribution on the surface of the hollow fiber tube 21. If the flow rate ratio is less than 5 times, the shear force is insufficient to destroy the polarization layer, resulting in a sharp decrease in the actual permeation flux due to interfacial resistance. If the flow rate ratio exceeds 15 times, although the flushing effect improves marginally, the fan noise and power consumption will increase exponentially. Therefore, 5 to 15 times is the golden window for balancing oxygen reduction efficiency and energy efficiency.

[0036] This embodiment achieves dynamic "mass replenishment + kinetic energy scouring" through a flow ratio of 5 to 15. By implementing specific flow field planning, it achieves dynamic management of the concentration polarization layer without relying on an ultra-high pressure pump. This scheme of actively controlling the nitrogen-oxygen separation effect through flow ratio enables this application to obtain excellent nitrogen-oxygen separation performance.

[0037] In one embodiment, such as Figure 1 , 3 As shown in Figure 5, the air intake mechanism 30 includes a first fan 30a, which is disposed in the air intake chamber 11. The air outlet direction of the first fan 30a is parallel to the extension direction of the hollow fiber tube 21.

[0038] Within the internal environment of the housing assembly 10, thousands of hollow fiber tubes 21 form a massive intake resistance matrix. By aligning the outlet direction of the first fan 30a with the axial direction of the hollow fiber tubes 21, the kinetic energy generated by the fan can be directly forced into each of the tiny tube cavities in a straight-pump manner. This aligned arrangement minimizes the turning losses and vortex resistance of the airflow at the moment of entry into the tube, ensuring that the high-speed kinetic energy output by the fan can be converted into the scouring velocity inside the tube almost without loss. This allows the system to robustly maintain a high-speed renewal flow field of 5 to 15 times the infiltration flow rate even at a relatively low rated power.

[0039] In one embodiment, the cross-sectional area of ​​the air intake chamber 11 is larger than the cross-sectional area of ​​the controlled atmosphere chamber 12; the first fan 30a is an axial flow fan.

[0040] The large air inlet chamber 11 physically constitutes a highly efficient pressure stabilizing buffer zone. Since the cross-sectional area of ​​the air inlet chamber 11 is larger than that of the subsequent controlled atmosphere chamber 12, the airflow can achieve uniform pressure diffusion in the air inlet chamber 11 after being ejected from the axial flow fan. This suppresses the uneven phenomenon of excessively high or low local flow velocity at the fan outlet, ensuring that the static pressure at the inlet of each hollow fiber tube 21 distributed across the entire chamber cross-section is uniform.

[0041] The axial flow fan has a relatively large air volume. By configuring the axial flow fan in the wide air inlet chamber 11, a large amount of air is driven into the membrane tube with a more stable pressure gradient. While ensuring a flow ratio of 5 to 15 times, the operating noise is effectively controlled, achieving a dual optimization of preservation performance and user experience.

[0042] In one embodiment, such as Figure 2 , 4 As shown in Figure 5, the housing assembly 10 includes a fan bracket 102 and a cylinder 101. The fan bracket 102 is fixedly connected to the cylinder 101. The fan bracket 102 fixes the first fan 30a. An air inlet chamber 11 is formed inside the fan bracket 102, and an air conditioning chamber 12 and an exhaust chamber 13 are formed inside the cylinder 101.

[0043] The fan bracket 102 and the cylinder 101 are assembled by a fixed connection (such as clips, screws, or hot-melt process). The fan bracket 102 not only provides stable support for the first fan 30a, but its internal space is also cleverly configured to form the aforementioned air inlet chamber 11. The fan bracket 102 can be pre-installed as an independent unit with the fan and its supporting circuitry, and then connected to the cylinder 101 containing the membrane module, greatly reducing production difficulty. The air inlet chamber 11 and the controlled atmosphere chamber 12 are physically defined by different structural boundaries. Combined with the sealing layer at the ends, the vacuum environment outside the hollow fiber tube 21 can be maintained more stably, ensuring that the controlled atmosphere chamber 12 remains physically isolated and prevents gas leakage when the module is subjected to the high-speed kinetic energy of the fan.

[0044] In one embodiment, a first support grid 161 is provided near the fan bracket 102 in the cylindrical body 101, and a second support grid 162 is provided inside the cylindrical body 101. Both the first support grid 161 and the second support grid 162 are provided with a plurality of honeycomb holes 163. The hollow fiber tube 21 passes through the honeycomb holes 163 of the first support grid 161 and the honeycomb holes 163 of the second support grid 162 in sequence. The first support grid 161 and the second support grid 162 support and position the hollow fiber membrane assembly 20.

[0045] These honeycomb holes 163 allow the multiple hollow fiber tubes 21 to be arranged in the desired orientation. On the one hand, this ensures that the modified atmosphere preservation modules 100 maintain a consistent shape during installation; on the other hand, it avoids resonance and adhesion problems caused by long, straight hollow fiber tubes 21 under high-flow airflow. Because the air intake mechanism 30 provides a very large air volume, without the constraint of the grille, the hollow fiber tubes 21 would attract each other due to the Bernoulli effect, resulting in a sharp reduction in the ventilation area.

[0046] In one embodiment, for achieving an airflow ratio of 5 to 15 times, the geometric parameters and packing density of the hollow fiber membrane module 20 are provided as follows: the total cross-sectional area of ​​the main body 212 in the modified atmosphere cavity 12 accounts for 30% to 60% of the cross-sectional area of ​​the modified atmosphere cavity 12, the diameter of the hollow fiber tube 21 ranges from 200µm to 400µm, and there is an air exchange gap between adjacent hollow fiber tubes 21 for airflow to pass through.

[0047] A packing density of 30% to 60% strikes a balance between space utilization and mass transfer efficiency. If the density exceeds 60%, the air exchange gap on the outside of the hollow fiber tube 21 will be too narrow, obstructing the diffusion path of oxygen molecules. If the density is below 30%, the hollow fiber membrane module 20 will have volume redundancy. A diameter of 200µm to 400µm ensures that the fine hollow fiber tube 21 has sufficient capillary strength to withstand negative pressure compression, while controlling the friction resistance of the flow inside the tube at a reasonable level. By limiting this parameter, this application ensures that there is sufficient air exchange gap between adjacent membrane tubes, meeting the flow conditions for a flow ratio of 5-15 times, and also significantly improving the oxygen production flux per unit volume.

[0048] In one embodiment, the sealing structure 15 includes a first sealing layer 151 and a second sealing layer 152 disposed at both ends of the modified atmosphere chamber 12. The connection between the air inlet end 211 and the main body portion 212 is embedded in the first sealing layer 151, and the connection between the exhaust end 213 and the main body portion 212 is embedded in the second sealing layer 152.

[0049] The embedded sealing design involves arranging the ends 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 shell and the outer wall of the hollow fiber tubes 21.

[0050] Through the above structure, on the one hand, the controlled atmosphere chamber 12 can be physically isolated. Except for the permeation through the hollow fiber tube 21, the gas to be treated in the controlled atmosphere chamber 12 cannot enter the air inlet chamber 11 and the exhaust chamber 13 through other means, thus ensuring the high purity of 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 or the high-frequency vibration environment brought by the fan, the end of the slender hollow fiber tube 21 will not loosen, retract, or fatigue break, thus ensuring the structural stability of the module during the long operating life of the refrigeration equipment.

[0051] In addition, since this implementation uses a large flow rate of 5 to 15 times, the dynamic pressure fluctuation at both ends of the hollow fiber tube 21 is large. The first sealing layer 151 and the second sealing layer 152 ensure that the gas to be treated in a high-speed flow state can only flow through the inside of the tube cavity and will never leak into the controlled atmosphere chamber 12 through the end, thus avoiding gas crossflow and ensuring the purity and stable operation of the oxygen-nitrogen separation process.

[0052] One embodiment of this application provides a refrigeration device, such as... Figure 1 As shown, it includes a first fresh-keeping compartment 200 and the aforementioned modified atmosphere preservation module 100. The air inlet chamber 11 and the exhaust chamber 13 of the modified atmosphere preservation module 100 are both connected to the first fresh-keeping compartment 200. The modified atmosphere preservation module 100 reduces the oxygen concentration in the fresh-keeping compartment.

[0053] When the modified atmosphere storage module 100 is activated, the air intake mechanism 30 drives the air in the first preservation chamber 200 to circulate between the modified atmosphere storage module 100 and the first preservation chamber 200. Oxygen continuously permeates through the hollow fiber tube 21 and is drawn out through the air extraction port 14. As the circulation continues, the oxygen concentration in the first 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 foods such as vegetables and fruits.

[0054] In one embodiment, such as Figure 6 As shown, the refrigeration equipment also includes a second fresh-keeping compartment 300, and an air extraction mechanism 40 is connected to the second fresh-keeping compartment 300 to introduce oxygen-enriched gas extracted from the controlled atmosphere chamber 12 into the second fresh-keeping compartment 300.

[0055] While the first preservation chamber 200 achieves low-oxygen reduction, the high-concentration oxygen extracted from the outer wall of the hollow fiber tube 21 by the air extraction mechanism 40 is directionally introduced into the second preservation chamber 300. Driven by the same controlled atmosphere system, two differentiated storage environments are created simultaneously: the first preservation chamber 200 maintains a low-oxygen state, suitable for the long-term preservation of easily respirable and metabolically active foods such as leafy vegetables and fruits; while the second preservation chamber 300 obtains an oxygen-rich environment, using high-concentration oxygen to inhibit the growth of anaerobic bacteria or maintain the bright red quality of certain meats, such as maintaining the vibrancy of certain flowers, or using the antibacterial properties of high-concentration oxygen to treat specific foods. In this way, the overall space utilization and preservation breadth of the refrigeration equipment are significantly improved.

[0056] In one embodiment, such as Figure 6 As shown, the refrigeration equipment also includes a second fan 400 disposed in the first fresh-keeping compartment 200. The second fan 400 guides the airflow in the first fresh-keeping compartment 200 toward the air intake chamber 11. The second fan 400 can be installed near the air intake chamber 11 and is specifically used to guide the airflow in the first fresh-keeping compartment 200 to actively blow toward the air intake chamber 11.

[0057] When the first preservation chamber 200 is large or the modified atmosphere preservation module 100 is installed in a relatively concealed position such as above or behind, the first fan 30a alone may not be able to quickly draw in a sufficient amount of circulating air. By setting up a second fan 400, the modified atmosphere preservation module 100 can form a strong induced flow in a large space, sending the air from the center of the first preservation chamber 200 into the air intake chamber 11. Its pressurization effect ensures that the air intake mechanism 30 always has a sufficient supply of new air, thereby stably maintaining the high-speed scouring flow field in the pipe and ensuring the gas regulation effect.

[0058] Compared with commonly used technologies, this embodiment has the following advantages: The modified atmosphere packaging module 100 creates a high-speed renewal flow field inside the hollow fiber tube 21 by configuring the air intake flow rate to be 5 to 15 times the air extraction flow rate. This flow ratio ensures that even when the airflow travels to the vicinity of the exhaust chamber 13 at the far end of the hollow fiber tube 21, the oxygen partial pressure inside the tube can still be maintained at a level sufficient to generate an osmotic pressure difference, achieving efficient utilization of the hollow fiber membrane module 20 along its entire length. Furthermore, the tangential shear force generated by the high-speed flow field can continuously and efficiently "strip" the nitrogen accumulation layer attached to the inner wall of the hollow fiber tube 21, updating the gas concentration gradient at the inner wall interface in real time. This significantly reduces the resistance of oxygen molecules permeating through the membrane wall, greatly improving the oxygen permeation flux of the modified atmosphere packaging module without relying on ultra-high pressure drive. This significantly improves the operational stability and energy efficiency ratio of the modified atmosphere packaging module 100, and enhances the preservation effect of the refrigeration equipment.

[0059] 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.

[0060] 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 assembly (10) is divided by a sealing structure (15) into an air intake chamber (11), a regulating atmosphere chamber (12) and an exhaust chamber (13) arranged sequentially along the length direction. The regulating atmosphere chamber (12) is provided with an air extraction port (14). Hollow fiber membrane module (20) includes a plurality of hollow fiber tubes (21), the main body (212) of the hollow fiber tube (21) is disposed in the modified atmosphere chamber (12), the air inlet end (211) of the hollow fiber tube (21) opens into the air inlet chamber (11), and its exhaust end (213) opens into the exhaust chamber (13); An air intake mechanism (30) has an air outlet connected to the air intake chamber (11) or an air inlet connected to the exhaust chamber (13); An air extraction mechanism (40) is connected to the air extraction port (14), and the air intake flow rate driven by the air intake mechanism (30) is configured to be 5 to 15 times the air extraction flow rate generated by the air extraction mechanism (40).

2. The modified atmosphere storage module (100) according to claim 1, characterized in that, The air intake mechanism (30) includes a first fan (30a), which is disposed in the air intake chamber (11) and the air outlet direction of the first fan (30a) is parallel to the extension direction of the hollow fiber tube (21).

3. The modified atmosphere storage module (100) according to claim 2, characterized in that, The cross-sectional area of ​​the air intake chamber (11) is larger than the cross-sectional area of ​​the air conditioning chamber (12); the first fan (30a) is an axial flow fan.

4. The modified atmosphere storage module (100) according to claim 2, characterized in that, The housing assembly (10) includes a fan bracket (102) and a cylinder (101). The fan bracket (102) is fixedly connected to the cylinder (101). The fan bracket (102) fixes the first fan (30a). The fan bracket (102) encloses the air inlet chamber (11). The cylinder (101) encloses the air conditioning chamber (12) and the exhaust chamber (13).

5. The modified atmosphere storage module (100) according to claim 4, characterized in that, The cylindrical body (101) is provided with a first support grid (161) at the end near the fan bracket (102), and a second support grid (162) is provided inside the cylindrical body (101). Both the first support grid (161) and the second support grid (162) are provided with a plurality of honeycomb holes (163). The hollow fiber tube (21) passes through the honeycomb holes (163) of the first support grid (161) and the honeycomb holes (163) of the second support grid (162) in sequence. The first support grid (161) and the second support grid (162) support and position the hollow fiber membrane assembly (20).

6. The modified atmosphere storage module (100) according to claim 1, characterized in that, The total cross-sectional area of ​​the main body (212) in the modified atmosphere cavity (12) accounts for 30% to 60% of the cross-sectional area of ​​the modified atmosphere cavity (12), the diameter of the hollow fiber tube (21) ranges from 200µm to 400µm, and there is an air exchange gap between adjacent hollow fiber tubes (21) for airflow to pass through.

7. The modified atmosphere storage module (100) according to claim 1, characterized in that, The sealing structure (15) includes a first sealing layer (151) and a second sealing layer (152) disposed at both ends of the modified atmosphere chamber (12). The connection between the air inlet end (211) and the main body part (212) is embedded in the first sealing layer (151), and the connection between the exhaust end (213) and the main body part (212) is embedded in the second sealing layer (152).

8. A refrigeration device, characterized in that: It includes a first fresh-keeping compartment (200) and a modified atmosphere preservation module (100) as described in any one of claims 1 to 7, wherein the air inlet chamber (11) and the exhaust chamber (13) of the modified atmosphere preservation module (100) are both connected to the first fresh-keeping compartment (200).

9. The refrigeration equipment according to claim 8, characterized in that, The refrigeration equipment also includes a second fresh-keeping compartment (300), and the air extraction mechanism (40) is connected to the second fresh-keeping compartment (300) to introduce oxygen-enriched gas extracted from the modified atmosphere chamber (12) into the second fresh-keeping compartment (300).

10. The refrigeration equipment according to claim 8, characterized in that, The refrigeration equipment also includes a second fan (400) disposed in the first fresh-keeping compartment (200), the second fan (400) guiding the airflow in the first fresh-keeping compartment (200) toward the air intake chamber (11).

Images