Oxygen reduction assembly, oxygen reduction drawer and refrigerator

Abstract

The invention relates to an oxygen reduction assembly, an oxygen reduction drawer and a refrigerator. Wherein the oxygen reduction assembly comprises a shell, a rotating assembly, a combined air duct and hollow fiber membrane filaments, the shell comprises an inner cavity, and the inner cavity comprises an air inlet cavity, an exchange cavity and an oxygen storage cavity which are sequentially arranged at intervals in the direction from the head to the tail; the rotating assembly is arranged at the head of the inner cavity, and a closed space is formed between the rotating assembly and the inner wall of the shell to form an air inlet cavity; the combined air duct is arranged outside the shell, is communicated with the air inlet cavity and is used for providing an inflow path for the feed gas to flow to the shell; the hollow fiber membrane wire is arranged in the exchange cavity, one end of the hollow fiber membrane wire is in sealed communication with the air inlet cavity, the other end of the hollow fiber membrane wire is in sealed communication with the oxygen storage cavity, the hollow fiber membrane wire is used for selectively separating nitrogen and oxygen from raw material gas, and separated oxygen-enriched gas flows into the oxygen storage cavity from the hollow fiber membrane wire; and the oxygen is discharged out of the shell through the oxygen storage cavity.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of refrigerators with oxygen reduction assemblies, in particular to an oxygen reduction assembly, an oxygen reduction drawer and a refrigerator. BACKGROUND

[0002] In order to prolong the preservation period of fruits and vegetables, the existing refrigerator often uses oxygen reduction technology to separate nitrogen and oxygen in air to reduce the oxygen concentration in the storage environment and inhibit the respiration of fruits and vegetables. Hollow fiber membrane filaments are the core elements for realizing the separation of nitrogen and oxygen. However, the airflow design of the existing oxygen reduction device has obvious defects. Most of the existing oxygen reduction devices adopt a one-way straight air duct to directly blow the membrane filaments. The airflow is parallel to the membrane, and the membrane surface lacks tangential force impact, which leads to slow gas renewal, easy formation of concentration polarization phenomenon, and significantly reduces the oxygen permeation rate. At the same time, the airflow is unevenly distributed on the membrane filament surface, the airflow speed at the middle and rear sections is seriously attenuated, the contact time between the raw material gas and the membrane is short, the membrane area utilization rate is low, and the membrane filament end is prone to form a "dead zone" of local nitrogen accumulation, further weakening the oxygen reduction mass transfer power.

[0003] In addition, the traditional oxygen reduction device lacks fine regulation means for the airflow path, and the airflow speed and stability are difficult to guarantee, which affects the uniformity of oxygen reduction. Some schemes introduce high-power motors to drive the fan for forced circulation in order to accelerate the gas renewal on the membrane surface, which not only increases the energy consumption, but also aggravates the water loss of fruits and vegetables and damages the storage quality.

[0004] The above problems collectively lead to insufficient separation efficiency and operation stability of the existing oxygen reduction device, which is difficult to meet the demand of efficient preservation of fruits and vegetables, and there is an urgent need for an oxygen reduction assembly that optimizes the airflow action mode and the air duct structure. SUMMARY

[0005] The present disclosure provides an oxygen reduction assembly, an oxygen reduction drawer and a refrigerator to solve the technical problem of insufficient separation efficiency and operation stability of the existing oxygen reduction device in the prior art, which is difficult to meet the demand of efficient preservation of fruits and vegetables.

[0006] The present disclosure provides an oxygen reduction assembly, an oxygen reduction drawer and a refrigerator to solve the technical problem of insufficient separation efficiency and operation stability of the existing oxygen reduction device in the prior art, which is difficult to meet the demand of efficient preservation of fruits and vegetables. The present disclosure provides an oxygen reduction assembly, an oxygen reduction drawer and a refrigerator to solve the technical problem of insufficient separation efficiency and operation stability of the existing oxygen reduction device in the prior art, which is difficult to meet the demand of efficient preservation of fruits and vegetables. The present disclosure provides an oxygen reduction assembly, an oxygen reduction drawer and a refrigerator to solve the technical problem of insufficient separation efficiency and operation stability of the existing oxygen reduction device in the prior art, which is difficult to meet the demand of efficient preservation of fruits and vegetables. The present disclosure provides an oxygen reduction assembly, an oxygen reduction drawer and a refrigerator to solve the technical problem of insufficient separation efficiency and operation stability of the existing oxygen reduction device in the prior art, which is difficult to meet the demand of efficient preservation of fruits and vegetables. The present disclosure provides an oxygen reduction assembly, an oxygen reduction drawer and a refrigerator to solve the technical problem of insufficient separation efficiency and operation stability of the existing oxygen reduction device in the prior art, which is difficult to meet the demand of efficient preservation of fruits and vegetables. The raw material gas entering at least part of the air inlet cavity via the combined air duct is used to drive the rotating assembly to rotate, so that the rotating assembly forms a spiral air to sweep the hollow fiber membrane filaments, the hollow fiber membrane filaments are used for selective separation of nitrogen and oxygen of the raw material gas, and the separated oxygen-rich gas flows to the oxygen storage cavity from the hollow fiber membrane filaments and is discharged to the outside of the shell from the oxygen storage cavity.

[0007] The oxygen reduction drawer provided by the embodiment of the present disclosure also includes the drawer body and the oxygen reduction assembly described above, and the oxygen reduction assembly is integrated inside the drawer body and used for reducing the oxygen concentration in the drawer body.

[0008] The refrigerator provided by the embodiment of the present disclosure also includes the oxygen reduction drawer described above.

[0009] Compared with the prior art, the technical solution provided by the embodiment of the present disclosure has the following advantages: The oxygen reduction assembly, the oxygen reduction drawer and the refrigerator provided by the embodiment of the present disclosure have the following advantages: the internal cavity of the shell is sequentially divided into an air inlet cavity, an exchange cavity and an oxygen storage cavity from the head to the tail, a rotating assembly that forms a closed space with the inner wall of the shell is arranged in the air inlet cavity, raw material gas is introduced by means of a combined air duct outside the shell and communicating with the air inlet cavity, part of the raw material gas is used to drive the rotating assembly to rotate to generate spiral air, the spiral air acts on the hollow fiber membrane filaments in the exchange cavity, nitrogen and oxygen are separated by the selective separation function of the hollow fiber membrane filaments, and the separated oxygen-rich gas is discharged from the oxygen storage cavity to the outside of the shell.

[0010] In this way, the concentration difference polarization phenomenon on the membrane surface can be effectively alleviated, the contact time of the raw material gas and the membrane filaments is prolonged, the membrane area utilization rate and the oxygen separation efficiency are improved, the stable and orderly airflow transmission and separation process are realized through the segmented design of the cavity and the synergistic effect of the components, and the rotating assembly does not need to be driven by an additional power.

[0011] In this way, the concentration difference polarization phenomenon on the membrane surface can be effectively alleviated, the contact time of the raw material gas and the membrane filaments is prolonged, the membrane area utilization rate and the oxygen separation efficiency are improved, the stable and orderly airflow transmission and separation process are realized through the segmented design of the cavity and the synergistic effect of the components, and the rotating assembly does not need to be driven by an additional power.

[0012] In this way, the concentration difference polarization phenomenon on the membrane surface can be effectively alleviated, the contact time of the raw material gas and the membrane filaments is prolonged, the membrane area utilization rate and the oxygen separation efficiency are improved, the stable and orderly airflow transmission and separation process are realized through the segmented design of the cavity and the synergistic effect of the components, and the rotating assembly does not need to be driven by an additional power. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, brief introductions will be given to the drawings needed to be used in the embodiments or prior art descriptions. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0015] One or more embodiments are illustrated by the pictures in the drawings corresponding thereto, which do not constitute a limitation on the embodiments, and elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified, and the drawings in the drawings do not constitute a proportional limitation.

[0016] Figure 1 The overall structural schematic diagram of the oxygen reduction assembly provided by the embodiments of the present disclosure is shown in the figure. Figure 2 The partial structural schematic diagram of the oxygen reduction assembly provided by the embodiments of the present disclosure in a semi-section state is shown in the figure. Figure 3 The partial structural schematic diagram of the oxygen reduction assembly provided by the embodiments of the present disclosure in a semi-section state is shown in the figure. Figure 4 The connection structure schematic diagram of the fixing member and the rotating assembly, and the hollow fiber membrane wire in the oxygen reduction assembly provided by the embodiments of the present disclosure is shown in the figure. Figure 5 The semi-section structural schematic diagram of the auxiliary air duct in the oxygen reduction assembly provided by the embodiments of the present disclosure is shown in the figure. Figure 6 The control logic schematic diagram of the oxygen reduction assembly applied to the oxygen reduction drawer for refrigerator provided by the embodiments of the present disclosure is shown in the figure.

[0017] Explanation of reference numerals: 1, shell; 2, fan; 3, vacuum pump; 4, air suction pipe; 5, air outlet air duct; 6, hollow fiber membrane wire; 7, rotating assembly; rotating assembly; 9, oxygen storage cavity; 10, air inlet hole; 11, air injection hole; 12, arc-shaped fan blade; 13, fixing member; 14, small hole; 15, partition plate; 16, exchange cavity; 17, spiral air duct; 18, auxiliary air duct; 19, main air duct; 20, push piece; 21, spiral air duct inlet; 22, spiral air duct outlet; 23, magnet; 24, Hall sensor. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of embodiments of the present disclosure, rather than all embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present disclosure.

[0019] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present disclosure. For the purpose of simplifying the present disclosure, certain examples of components and arrangements are described. These are, of course, merely examples and are in no way limiting of the present disclosure. In addition, the present disclosure can repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and / or configurations discussed.

[0020] For ease of description, spatial relative terms used in the description, such as "inner", "outer", "inward", "outward", "lower", "below", "upper", "above", "front", "back", etc., can be used to describe the relative position relationship or movement of one element or feature to another element or feature as shown in the drawings. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over or the posture is changed or the movement state is changed, then the directional indications will also change accordingly, for example: the element described as "below" or "under" another element or feature will be subsequently oriented as "above" or "over" the other element or feature. Therefore, the example term "below" can include both upward and downward positions. The device can be additionally oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptions used in the description will be interpreted accordingly.

[0021] Reference Figures 1-6The present disclosure provides a kind of oxygen reduction assembly, it includes: shell, rotating assembly, combined air duct and hollow fiber membrane silk, wherein the shell includes internal cavity, internal cavity is by itself head towards the direction of tail, its inside includes the air inlet cavity, exchange cavity and oxygen storage cavity that are sequentially separated;Rotating assembly is located in the head of internal cavity, and the sealed space is formed between rotating assembly and the inner wall of shell, to form air inlet cavity;Combined air duct is located outside the shell, and is communicated with air inlet cavity, for providing the inflow path of raw material gas to the shell;Hollow fiber membrane silk is located in exchange cavity, one end of hollow fiber membrane silk is sealed and communicated with air inlet cavity, the other end of hollow fiber membrane silk is sealed and communicated with oxygen storage cavity;At least part of raw material gas that enters air inlet cavity via combined air duct is used to drive rotating assembly to rotate, to make rotating assembly form spiral wind sweeps hollow fiber membrane silk, and hollow fiber membrane silk is used to carry out the selective separation of raw material gas to nitrogen and oxygen, and the oxygen-enriched gas after separation flows to oxygen storage cavity from hollow fiber membrane silk, and is discharged to outside the shell from oxygen storage cavity.

[0022] Exemplary, combined air duct refers to the special structure that is located outside the shell and is communicated with air inlet cavity, for providing the dedicated path of raw material gas to the internal cavity of shell;Sealed communication refers to that when two ends of hollow fiber membrane silk are connected with air inlet cavity and oxygen storage cavity, there is no gas leakage, to ensure that raw material gas only passes through hollow fiber membrane silk to complete separation, and oxygen-enriched gas can be directed to flow to oxygen storage cavity;Spiral wind sweeping refers to the spiral flow generated during the rotation of rotating assembly, which can fully cover the surface of hollow fiber membrane silk and continuously act;Internal cavity sequentially separated from head to tail refers to that along the axial direction of shell, from one end close to rotating assembly to the other end, air inlet cavity, exchange cavity and oxygen storage cavity are sequentially divided into independent and sequentially connected;The sealed space formed between rotating assembly and the inner wall of shell refers to that the outer edge of rotating assembly is tightly attached to the inner wall of shell, to form a closed area without gas leakage, which is air inlet cavity.

[0023] In this way, by sequentially separating the internal cavity of shell into air inlet cavity, exchange cavity and oxygen storage cavity from head to tail, setting rotating assembly in air inlet cavity to form sealed space with the inner wall of shell, introducing raw material gas via combined air duct outside the shell and communicated with air inlet cavity, driving rotating assembly to rotate by part of raw material gas to generate spiral wind, which acts on hollow fiber membrane silk in exchange cavity, realizing nitrogen-oxygen separation by the selective separation function of hollow fiber membrane silk, and discharging oxygen-enriched gas after separation from shell via oxygen storage cavity, the phenomenon of membrane surface concentration polarization can be effectively alleviated, the contact time of raw material gas and membrane silk is prolonged, the membrane area utilization rate and oxygen separation efficiency are improved;By cavity segmentation design and component synergistic effect, stable and orderly gas flow transmission and separation process is realized, without additional power to drive rotating assembly.

[0024] In some embodiments, the combined air duct comprises two parallel and separated main air duct and auxiliary air duct, the outlet of the auxiliary air duct is arranged towards the outer circumferential side of the rotating assembly, and the outlet of the main air duct blows tangentially to the front face of the rotating assembly; the gas flow from the auxiliary air duct is used to drive the rotating assembly to rotate around the axial direction of the rotating assembly, and the gas flow from the main air duct forms a main spiral air through the rotating assembly, which is used to tangentially flush the surface of the hollow fiber membrane.

[0025] For example, the two parallel and separated main air duct and auxiliary air duct refer to the main air duct and the auxiliary air duct extending in the same direction and being independent of each other without being connected, which together constitute the main structure of the combined air duct; the outlet of the auxiliary air duct arranged towards the outer circumferential side of the rotating assembly refers to the gas flow output end of the auxiliary air duct being aligned with the peripheral area of the side face of the rotating assembly, so as to ensure that the outflowing gas flow can directly act on the outer circumferential part of the rotating assembly to drive it to rotate; the outlet of the main air duct blowing tangentially to the front face of the rotating assembly refers to the gas flow output direction of the main air duct being at a tangential angle with the front face of the rotating assembly, so that when the gas flow blows to the front face of the rotating assembly, it can drive it to form a spiral air flow; the rotating assembly rotating around the axial direction of itself refers to the rotating assembly rotating around the circumferential direction of the central axis of itself, and the rotating track is coaxial with the central axis; the main spiral air being used to tangentially flush the surface of the hollow fiber membrane refers to the flowing direction of the main spiral air being at a tangential relationship with the surface of the hollow fiber membrane, so as to continuously and comprehensively sweep the surface of the membrane and realize gas renewal.

[0026] In this way, the combined air duct is configured as the parallel and separated main air duct and auxiliary air duct, the outlet of the auxiliary air duct is aligned with the outer circumferential side of the rotating assembly, the outflowing gas flow of the auxiliary air duct can drive the rotating assembly to rotate around the central axis of itself, the outlet of the main air duct is arranged at a tangential direction towards the front face of the rotating assembly, so that the outflowing gas flow of the main air duct passes through the rotating assembly to form a main spiral air, and the main spiral air can act on the surface of the hollow fiber membrane in a tangential manner to realize targeted gas flow flushing and nitrogen-oxygen separation cooperation; the main spiral air formed by the main air duct tangentially flushes the surface of the hollow fiber membrane, effectively accelerates the gas renewal of the membrane surface, relieves the concentration difference polarization phenomenon, prolongs the contact time of the raw material gas and the membrane, improves the membrane area utilization rate and the oxygen separation efficiency, and improves the problem of uneven gas distribution of the traditional device.

[0027] In some embodiments, the oxygen reduction assembly further comprises a spiral air duct arranged in the shell wall interlayer of the shell, the inlet of the spiral air duct is communicated with the auxiliary air duct, and the outlet of the spiral air duct is arranged at the rear end of the exchange cavity, which is used to form a secondary spiral air from the outflowing gas flow of the auxiliary air duct to supplement the air force at the end of the hollow fiber membrane.

[0028] Exemplarily, the shell wall interlayer refers to the interlayer space formed inside the wall of the shell, which is specially used to accommodate and arrange the spiral air duct; the inlet of the spiral air duct in communication with the auxiliary air duct refers to that one end of the spiral air duct receiving the airflow is in open connection with the airflow output end of the auxiliary air duct, so as to ensure that the airflow of the auxiliary air duct can flow into the spiral air duct smoothly; the outlet of the spiral air duct arranged at the middle rear end of the exchange cavity refers to that one end of the spiral air duct outputting the airflow is located at a position slightly rearward of the middle of the exchange cavity in the direction from the head to the tail, corresponding to the end region of the hollow fiber membrane filament; the auxiliary spiral air refers to the spiral airflow formed after the airflow passes through the spiral path of the spiral air duct; and the wind force supplementing the end of the hollow fiber membrane filament refers to that the auxiliary spiral air directly acts on the end of the hollow fiber membrane filament far away from the air inlet cavity, so as to enhance the airflow intensity of the region and make up for the attenuation of the original airflow at the end of the membrane filament.

[0029] In this way, the spiral air duct is arranged in the shell wall interlayer, the inlet of the spiral air duct is in communication with the auxiliary air duct, and the outlet of the spiral air duct is arranged at the middle rear end of the exchange cavity, so that the airflow output by the auxiliary air duct forms the auxiliary spiral air through the guidance of the spiral air duct, the auxiliary spiral air directly acts on the end region of the hollow fiber membrane filament, the wind force at the end of the membrane filament is supplemented, the auxiliary spiral air effectively makes up for the airflow attenuation problem of the end region of the hollow fiber membrane filament, avoids the accumulation of nitrogen gas in the local end to form a dead zone, and improves the oxygen reduction mass transfer power; meanwhile, the airflow is more uniformly distributed in the whole membrane section, the concentration polarization phenomenon is further relieved, and the end oxygen reduction effect is strengthened without the need of additionally increasing the air blower.

[0030] In some embodiments, the spiral air duct is arranged in a spiral shape along the extension direction of the shell, and the wind direction of the auxiliary spiral air matches the wind direction of the main spiral air, so that the two airflows cooperatively flush in the exchange cavity, so as to prolong the contact time of the raw material gas and the membrane filament.

[0031] Exemplarily, the spiral air duct is arranged in a spiral shape along the extension direction of the shell, that is, the spiral air duct is arranged in a spiral shape along the extension trajectory of the shell, and is arranged in a spiral shape to form an airflow channel in the extension direction of the shell; the wind direction of the auxiliary spiral air matches the wind direction of the main spiral air, that is, the flow direction of the auxiliary spiral air matches the flow direction of the main spiral air or forms a complementary match, so as to ensure that the two airflows can be superimposed in the same direction or cooperatively in the exchange cavity; the two airflows cooperatively flush in the exchange cavity, that is, the main spiral air and the auxiliary spiral air cooperatively act in the exchange cavity to form a continuous and comprehensive airflow flushing state, and cooperatively act on the surface of the hollow fiber membrane filament to enhance the effect of the airflow on the membrane filament.

[0032] In this way, the spiral air duct is designed in a spiral shape along the extension direction of the shell, while the wind direction of the secondary spiral air flow is matched with the wind direction of the primary spiral air flow, so that the two air flows form a synergistic flushing effect in the exchange cavity, thereby prolonging the contact time of the raw material gas and the hollow fiber membrane and optimizing the gas separation process. That is, the spiral air duct arranged in a spiral shape can stably guide the formation of the secondary spiral air flow, and the wind direction matching design avoids interference between the two air flows, and the synergistic flushing effect not only significantly prolongs the contact time of the raw material gas and the membrane, but also improves the membrane area utilization rate, and makes the air flow more uniformly distributed on the membrane surface, further alleviates the concentration polarization phenomenon, and effectively improves the oxygen reduction efficiency and the stability of the separation process.

[0033] In some embodiments, the shell is in a cylindrical shape as a whole, the bottom is provided with an air outlet duct in communication with the exchange cavity, and the top is provided with an air exhaust pipe in communication with the oxygen storage cavity. The oxygen storage cavity is used for temporarily storing oxygen-enriched gas separated by the membrane, and the air outlet duct is used for discharging nitrogen-enriched gas separated by the membrane.

[0034] For example, the shell is in a cylindrical shape as a whole, which means that the overall shape of the shell is a complete cylindrical structure that can adapt to the layout of the internal components and guide the air flow to flow uniformly in the circumferential direction. The bottom is provided with an air outlet duct in communication with the exchange cavity, which means that the air outlet duct is located at the bottom of the shell and is in smooth air flow communication with the exchange cavity, and is specially used for guiding the specific gas separated by the membrane to be discharged. The top is provided with an air exhaust pipe in communication with the oxygen storage cavity, which means that the air exhaust pipe is installed at the top of the shell and forms an unobstructed air flow channel with the oxygen storage cavity, which is used for guiding the gas in the oxygen storage cavity to be outputted outward. The oxygen storage cavity is used for temporarily storing oxygen-enriched gas separated by the membrane, which means that the oxygen storage cavity is a space specially used for temporarily containing oxygen-enriched gas separated by the hollow fiber membrane, so as to avoid the direct diffusion of the oxygen-enriched gas affecting the separation effect. The air outlet duct is used for discharging nitrogen-enriched gas separated by the membrane, which means that the special function of the air outlet duct is to direct the discharge of the nitrogen-enriched gas remaining after the separation by the hollow fiber membrane, so as to ensure that the nitrogen-enriched gas and the oxygen-enriched gas after the separation go their own ways.

[0035] In this way, the shell is designed in a cylindrical shape as a whole, the bottom is provided with an air outlet duct in communication with the exchange cavity, and the top is provided with an air exhaust pipe in communication with the oxygen storage cavity. The oxygen storage cavity is used for temporarily storing oxygen-enriched gas separated by the membrane, while the air outlet duct is used for directing the discharge of the nitrogen-enriched gas separated by the membrane, thereby constructing a special storage and discharge path for the separated gas and forming an orderly post-separation treatment process of nitrogen and oxygen. That is, the design of the cylindrical shell facilitates smooth flow of the internal air flow, reduces air flow retention and interference, and avoids aggravating the concentration polarization phenomenon. The cooperation of the air exhaust pipe and the oxygen storage cavity realizes stable temporary storage and directional discharge of the oxygen-enriched gas, the air outlet duct ensures timely discharge of the nitrogen-enriched gas, effectively avoids mixing of the two separated gases, guarantees the purity and stability of the nitrogen-oxygen separation, optimizes the gas discharge path, and improves the continuity and overall efficiency of the oxygen reduction process.

[0036] In some embodiments, the oxygen reduction assembly further comprises a fan and a vacuum pump; The fan is in communication with the inlets of the main air duct and the auxiliary air duct, and is used to suck external gas to form raw material gas for nitrogen-oxygen separation; The vacuum pump is connected to the end of the air exhaust pipe away from the oxygen storage cavity, and is used to exhaust the inside of the hollow fiber membrane to a reduced pressure state to provide a pressure difference condition for nitrogen-oxygen separation.

[0037] For example, the communication of the fan with the inlets of the main air duct and the auxiliary air duct means that the airflow output end of the fan is in communication with the airflow input ends of the main air duct and the auxiliary air duct to ensure that the inhaled external gas can be simultaneously distributed to the two air ducts; the inhaled external gas to form raw material gas for nitrogen-oxygen separation means that the fan generates suction through its own operation to inhale air outside the oxygen reduction assembly and introduce it into the air duct, and these air serves as the initial medium for nitrogen-oxygen separation, i.e., the raw material gas; the connection of the vacuum pump to the end of the air exhaust pipe away from the oxygen storage cavity means that the air exhaust port of the vacuum pump is fixedly and sealingly connected to the other end of the air exhaust pipe that is not connected to the oxygen storage cavity to ensure that there is no leakage during the air exhaust process; the exhaustion of the inside of the hollow fiber membrane to a reduced pressure state means that the vacuum pump continuously exhausts the gas inside the oxygen storage cavity through the air exhaust pipe, which indirectly causes the gas pressure inside the hollow fiber membrane in communication with the oxygen storage cavity to be lower than that of the external exchange cavity, thereby forming a pressure difference; the provision of a pressure difference condition for nitrogen-oxygen separation means that the pressure difference between the inside and outside of the membrane can drive oxygen to dissolve on the membrane surface, diffuse into the membrane, and finally desorb, thereby providing necessary power support for the selective separation of nitrogen and oxygen.

[0038] Among them, the fan and the vacuum pump are auxiliary functional components of the oxygen reduction assembly, which establish communication between the fan and the inlets of the main air duct and the auxiliary air duct, inhale external gas through the operation of the fan and convert it into raw material gas required for nitrogen-oxygen separation, and connect the vacuum pump to the end of the air exhaust pipe away from the oxygen storage cavity, and exhaust the inside of the hollow fiber membrane to a reduced pressure state through the air exhaust function of the vacuum pump, thereby providing necessary pressure difference conditions for the selective separation of nitrogen and oxygen, and constructing a complete separation power system.

[0039] In this way, the setting of the fan realizes stable inhalation and supply of the raw material gas, ensures that the main air duct and the auxiliary air duct always have sufficient airflow to participate in the work, and avoids the decrease in separation efficiency caused by insufficient airflow; the vacuum pump creates a pressure difference between the inside and outside of the membrane to provide core power for nitrogen-oxygen separation, and ensures that the hollow fiber membrane can efficiently realize the dissolution, diffusion and desorption of oxygen, thereby significantly improving the separation rate; the two work together to make the power supply of the oxygen reduction process more stable, effectively solve the problems of insufficient airflow supply and lack of separation power of the traditional device, and further improve the overall operation efficiency and reliability of the oxygen reduction assembly.

[0040] In some embodiments, the oxygen-enriched gas formed by the separation of hollow fiber membrane fibers enters the oxygen storage chamber through its open end, and is then extracted to the outside by a vacuum pump through the extraction pipe; the nitrogen-enriched gas formed by the separation is discharged to the external environment through the exhaust duct under the synergistic effect of the main spiral wind and the auxiliary spiral wind.

[0041] For example, the open end of the hollow fiber membrane filament refers to the end of the filament that allows oxygen-enriched gas to flow out and enter the oxygen storage chamber, serving as a dedicated channel for the oxygen-enriched gas to exit from inside the membrane filament; oxygen-enriched gas entering the oxygen storage chamber through its open end means that the oxygen-enriched gas formed by membrane separation flows directionally through this open end into the oxygen storage chamber for temporary storage, preparing for subsequent extraction; the synergistic effect of the main spiral wind and the auxiliary spiral wind means that the two spiral winds cooperate with each other in terms of flow direction and force, forming a continuous and stable airflow driving force, jointly driving the nitrogen-enriched gas to move towards the outlet air duct; discharge to the external environment through the outlet air duct means that the outlet air duct serves as a dedicated emission channel for nitrogen-enriched gas, guiding the separated nitrogen-enriched gas to a designated area outside the oxygen reduction component, preventing the accumulation of nitrogen-enriched gas inside the component; extraction to the outside by the vacuum pump means that the vacuum pump generates continuous suction through the extraction pipe, extracting the oxygen-enriched gas in the oxygen storage chamber and transporting it outside the oxygen reduction component, completing the final separation and discharge of the oxygen-enriched gas.

[0042] Specifically, the flow directions of the two gases after separation of the hollow fiber membrane fibers are clearly defined. The oxygen-enriched gas enters the oxygen storage chamber through the open end of the membrane fibers for temporary storage, and is then extracted to the outside of the module by the extraction pipe connected to the oxygen storage chamber in conjunction with a vacuum pump. The nitrogen-enriched gas, under the joint propulsion of the main spiral wind and the auxiliary spiral wind, converges along a specific path to the exhaust duct and is finally discharged to the external environment, realizing the orderly diversion and directional emission of the separated gases.

[0043] In this way, the separate discharge design of oxygen-enriched and nitrogen-enriched gases completely avoids the mixing of the two gases, ensuring the purity of nitrogen-oxygen separation and effectively solving the problem of decreased oxygen reduction efficiency caused by chaotic gas discharge in traditional devices. The synergistic effect of the main and auxiliary spiral air provides stable power for the discharge of nitrogen-enriched gas, preventing it from lingering in the exchange chamber and aggravating concentration polarization. The efficient extraction of oxygen-enriched gas by the vacuum pump further enhances the pressure difference between the inside and outside of the membrane, improving the separation rate. At the same time, the smooth discharge of the two gases makes the oxygen reduction process more continuous, improving the overall operational stability and preservation effect of the components.

[0044] In some embodiments, hollow fiber membrane filaments are arranged axially along the exchange chamber in the central region, and the oxygen reduction assembly further includes a fixing element and a partition. The fixing element is located at the end of the exchange chamber away from the oxygen storage chamber and is used to fix the closed end of the hollow fiber membrane filament; A partition is located at one end of the exchange chamber near the oxygen storage chamber to separate the exchange chamber from the oxygen storage chamber. The open end of the hollow fiber membrane is installed on the partition and communicates with the oxygen storage chamber.

[0045] Exemplarily, the extending direction of the hollow fiber membrane filaments arranged along the axis of the exchange cavity is consistent with the extending direction of the length of the exchange cavity, ensuring that the membrane filaments are arranged in order in the exchange cavity; the middle region refers to the middle position of the exchange cavity along the cross-sectional direction thereof, which enables the membrane filaments to fully contact the gas flow; the fixing member refers to a component specially used for fixing the closed end of the hollow fiber membrane filament, which functions to limit the displacement of the closed end and ensure that the closed end is in a sealed state; the partition plate refers to a component having a partition function, which is installed at a position capable of clearly dividing the spatial boundary of the exchange cavity and the oxygen storage cavity, thereby avoiding direct flow of the gas in the two cavities; the closed end refers to one end of the hollow fiber membrane filament, which is not allowed to be entered or flowed out by the gas, and which, after being fixed by the fixing member, can prevent the raw material gas from penetrating into the interior of the membrane filament; the open end refers to one end of the hollow fiber membrane filament, which is allowed to flow out the oxygen-enriched gas, and which, after being installed on the partition plate, can direct the oxygen-enriched gas into the oxygen storage cavity; the partitioning of the exchange cavity and the oxygen storage cavity refers to the fact that the partition plate can block the direct gas flow channel between the exchange cavity and the oxygen storage cavity, so that the two cavities each maintain a relatively independent gas environment.

[0046] In the membrane separation unit, the hollow fiber membrane filaments are arranged in the middle region of the exchange cavity along the axis thereof, the closed end of the hollow fiber membrane filament is fixed by the fixing member arranged at one end of the exchange cavity away from the oxygen storage cavity, and the open end of the hollow fiber membrane filament is installed on the partition plate arranged at one end of the exchange cavity close to the oxygen storage cavity, so as to realize the partitioning of the exchange cavity and the oxygen storage cavity by the partition plate and maintain the communication between the open end and the oxygen storage cavity, thereby constructing a membrane separation unit with stable structure and clear separation path.

[0047] In this way, the arrangement of the hollow fiber membrane filaments in the middle of the axis ensures that the gas flow can fully and uniformly act on the surface of the membrane filaments, avoids local gas flow shielding, prolongs the contact time of the raw material gas with the membrane filaments, and improves the membrane area utilization rate; the fixing of the closed end by the fixing member and the partitioning by the partition plate effectively prevent gas leakage and mixing of the gas between the exchange cavity and the oxygen storage cavity, thereby ensuring the purity of nitrogen-oxygen separation, and the stable membrane filament installation structure reduces the shaking caused by the gas flow impact, further alleviates the concentration difference polarization phenomenon, and improves the separation efficiency and system operation stability.

[0048] In some embodiments, the rotating assembly includes an arc-shaped fan blade on the side surface, an air inlet hole on the front surface, and a jet hole on the side facing the hollow fiber membrane filaments; the arc-shaped fan blade is arranged opposite to the air outlet of the auxiliary air duct and is used to receive the gas flow discharged from the auxiliary air duct to drive the rotating assembly to rotate; the air inlet hole is in communication with the air outlet of the main air duct, and the gas flow enters the interior of the rotating assembly through the air inlet hole and is discharged through the jet hole to form a main spiral wind.

[0049] Exemplarily, the arc-shaped fan blade on the side refers to an arc-shaped structure arranged on the side of the rotating assembly, which is adapted to the direction of airflow impact, can efficiently receive the airflow out of the secondary air duct and convert it into the power to drive the rotation of the rotating assembly; the air inlet hole on the front refers to a through hole arranged on the surface of the rotating assembly on the side facing the main air duct, which is specially used for receiving the airflow delivered by the main air duct; the air outlet hole on the side facing the hollow fiber membrane refers to a through hole arranged on the side of the rotating assembly close to the hollow fiber membrane, and when the airflow is sprayed out of the hole, it will form a spiral airflow due to the rotation of the rotating assembly; the arc-shaped fan blade is arranged opposite to the air outlet of the secondary air duct, which means that the position of the arc-shaped fan blade corresponds to the port through which the airflow of the secondary air duct is discharged, so as to ensure that the airflow out of the secondary air duct can directly act on the arc-shaped fan blade; the airflow of the main air duct enters the internal space of the rotating assembly through the air inlet hole, and then is sprayed out of the air outlet hole to form a main spiral wind under the driving of the rotation of the rotating assembly.

[0050] Exemplarily, the arc-shaped fan blades are uniformly distributed along the circumference of the rotating assembly, which ensures that the high-speed airflow out of the secondary air duct can uniformly drive the rotation of the rotating assembly, avoiding speed fluctuation.

[0051] The rotating assembly integrates the arc-shaped fan blade on the side, the air inlet hole on the front, and the air outlet hole on the side facing the hollow fiber membrane, so that the arc-shaped fan blade is arranged opposite to the air outlet of the secondary air duct to receive the airflow and drive the rotation of the assembly, and the air inlet hole is in communication with the air outlet of the main air duct, so that the airflow of the main air duct enters the internal space of the rotating assembly through the air inlet hole, and then is sprayed out of the air outlet hole to form a main spiral wind, realizing the integrated design of airflow driving and spiral wind generation.

[0052] In this way, the precise cooperation between the arc-shaped fan blade and the secondary air duct realizes the driving of the rotating assembly without additional power, which takes into account energy saving and driving stability; the structural design of the air inlet hole and the air outlet hole makes the airflow of the main air duct form a directional main spiral wind, which continuously cuts the surface of the hollow fiber membrane, effectively speeds up the gas update on the membrane surface, relieves the concentration polarization phenomenon, prolongs the contact time of the raw material gas and the membrane, improves the membrane area utilization, and solves the problem of single airflow action mode and insufficient separation efficiency of the traditional device.

[0053] In some embodiments, the air outlet holes are uniformly distributed on the side of the rotating assembly facing the hollow fiber membrane, so that the main spiral wind uniformly acts on the surface of the hollow fiber membrane.

[0054] For example, the uniform distribution of the air injection holes refers to that the air injection holes are regularly arranged at a fixed interval on the side of the rotating assembly facing the hollow fiber membrane filaments, the size and orientation of each air injection hole are consistent, and the strength and coverage of the air flow injected from the air injection holes are uniform; the side of the rotating assembly facing the hollow fiber membrane filaments refers to the end face of the rotating assembly close to the hollow fiber membrane filaments and used for injecting the main spiral wind; and the uniform action of the main spiral wind on the surface of the hollow fiber membrane filaments refers to that the main spiral wind can fully cover each region of the hollow fiber membrane filaments after being injected from the uniformly distributed air injection holes, so that each part of the membrane filament surface can be washed by the air flow with similar strength, and there is no region with weak or missing air flow.

[0055] In this way, by designing the uniform distribution of the air injection holes on the side of the rotating assembly facing the hollow fiber membrane filaments, the main spiral wind formed by the rotating assembly can be injected from each uniformly arranged air injection hole, so as to ensure that the main spiral wind fully covers the surface of the hollow fiber membrane filaments during diffusion, realizes the uniform action of the air flow on the membrane filaments, that is, the uniform distribution of the air injection holes solves the problem of uneven distribution of the air flow on the membrane filament surface in the traditional device, so that the main spiral wind can wash the membrane filament surface without dead angle, effectively avoids the concentration polarization caused by slow gas renewal in the local region, and significantly improves the membrane area utilization rate; at the same time, the uniform air flow action makes the nitrogen-oxygen separation of the whole membrane section more balanced, further guarantees the uniformity of oxygen reduction, and improves the overall separation efficiency and system operation stability.

[0056] In some embodiments, the secondary air duct is internally provided with a paddle, and the paddle is axially movable and adjustable in angle by a rotating member, and is used for adjusting the air flow speed in the secondary air duct by narrowing or widening the flow width of the secondary air duct, so as to adjust the rotating speed of the rotating assembly.

[0057] For example, the rotating member refers to a component capable of driving the paddle to move, which provides power support for the axial movement and angle adjustment of the paddle; the axial movement and angle adjustment of the paddle refer to that the paddle can move along the length extension direction of the secondary air duct and change the included angle between the paddle and the inner wall of the secondary air duct under the driving of the rotating member; the flow width of the secondary air duct refers to the effective passage size of the secondary air duct allowing the air flow to pass through; the narrowing or widening of the flow width of the secondary air duct refers to that the passing space of the air flow in the secondary air duct is reduced or increased by changing the angle of the paddle; the adjustment of the air flow speed in the secondary air duct refers to that the air flow speed is increased when the flow width of the secondary air duct is narrowed, and the air flow speed is decreased when the flow width is widened, so as to realize the dynamic change of the air flow speed; and the adjustment of the rotating speed of the rotating assembly refers to that the change of the air flow speed in the secondary air duct directly affects the driving force of the rotating assembly, so as to correspondingly change the rotating speed of the rotating assembly.

[0058] In this way, the paddle is arranged inside the auxiliary air duct, the paddle is driven to move axially along the auxiliary air duct by the rotating member to adjust the angle thereof, the narrowing or widening of the flow passage width of the auxiliary air duct is realized by the change of the angle of the paddle, the flow speed of the airflow in the auxiliary air duct is changed, and finally the precise adjustment of the rotating speed of the rotating assembly is realized by the regulation of the airflow speed, which adapts to the dynamic requirements of the airflow state in the oxygen reduction process. That is, the angle adjustment design of the paddle solves the problems of single airflow control means and unstable wind speed of the traditional device, can flexibly adjust the airflow speed of the auxiliary air duct according to actual requirements, keeps the rotating speed of the rotating assembly stable, and then ensures the stability and consistency of the main spiral wind, avoids the intensification of concentration polarization or insufficient oxygen reduction uniformity caused by airflow fluctuation; without additional high-power driving components, energy saving is considered while precise regulation is realized, and the consistency and overall efficiency of the oxygen reduction process are effectively improved.

[0059] In some embodiments, the initial state of the paddle is about 45°, and the angle is adjusted by axial movement to continuously adjust the flow passage width of the auxiliary air duct, thereby adapting to different rotating speed requirements.

[0060] For example, the initial state of about 45° refers to the initial installation angle of the paddle before adjustment, which provides an initial reference flow passage width for the auxiliary air duct; adjusting the angle along the axial direction refers to that the paddle moves along the length extension direction of the auxiliary air duct as a track while changing the included angle with the inner wall of the auxiliary air duct; continuously adjusting the flow passage width of the auxiliary air duct refers to that the effective passage space of the auxiliary air duct can change gradually without gaps during the angle adjustment of the paddle, rather than stepwise adjustment; adapting to different rotating speed requirements refers to continuously changing the airflow speed by adjusting the flow passage width of the auxiliary air duct, so that the rotating speed of the rotating assembly can meet the airflow intensity requirements in different oxygen reduction scenarios, and the separation effect is stable.

[0061] In this way, the initial angle of the paddle provides a stable reference for subsequent adjustment, and the continuous adjustment of the flow passage width by axial movement solves the problems of single airflow control and unstable wind speed of the traditional device, can dynamically adjust the airflow speed of the auxiliary air duct according to actual oxygen reduction requirements, keeps the rotating speed of the rotating assembly in an adaptive state at all times, ensures the stability and consistency of the main spiral wind, further improves the oxygen reduction efficiency and system operation reliability, and does not need to additionally add regulation components.

[0062] In some embodiments, the oxygen reduction assembly further comprises a rotating speed detection unit, the rotating speed detection unit comprises a permanent magnet and a Hall sensor; the permanent magnet is installed on the arc-shaped fan blade to rotate synchronously with the rotating assembly; the Hall sensor is installed in the shell and arranged close to the rotating assembly to detect the rotating pulse of the permanent magnet to calculate the actual rotating speed of the rotating assembly.

[0063] Exemplarily, the rotation speed detection unit refers to a combination of components specially used for detecting the rotation speed of the rotating assembly, which is composed of a permanent magnet and a Hall sensor that cooperate with each other; the permanent magnet is installed on the arc-shaped fan blade, i.e., the permanent magnet is fixed at a specified position of the arc-shaped fan blade and forms a stable connection with the arc-shaped fan blade; the rotation rhythm of the permanent magnet is completely consistent with that of the rotating assembly, i.e., the rotating assembly drives the permanent magnet to rotate synchronously when the rotating assembly rotates, and there is no relative motion; the Hall sensor is installed in the housing and is arranged close to the rotating assembly, i.e., the Hall sensor is fixed in the internal space of the housing, and its installation position is kept at a relatively close distance from the rotating assembly to ensure that the rotation signal of the permanent magnet can be effectively captured; the rotation pulse of the permanent magnet is detected, i.e., the Hall sensor outputs a corresponding electric pulse signal each time the permanent magnet approaches the Hall sensor during rotation; and the actual rotation speed of the rotating assembly is calculated, i.e., the Hall sensor calculates the number of rotation times of the rotating assembly per unit time by counting the number of pulses received per unit time, and converts the number to obtain the rotation times of the rotating assembly per unit time, i.e., the actual rotation speed reflecting the real rotation state of the rotating assembly.

[0064] In this way, the rotation speed detection unit realizes real-time and accurate monitoring of the actual rotation speed of the rotating assembly, solves the problem of blindness in airflow regulation caused by the lack of effective rotation speed feedback of the traditional device, provides a reliable basis for subsequent dynamic adjustment of the airflow speed of the auxiliary air duct and stabilization of the spiral wind state, ensures accurate matching of the airflow speed and the membrane separation demand during the oxygen reduction process, further improves the stability and consistency of the oxygen reduction efficiency, and has a simple structure without the need for complex detection components.

[0065] In some embodiments, the oxygen reduction assembly further comprises a control system electrically connected with the Hall sensor and the rotating member, which is used to compare the actual rotation speed with the preset rotation speed, control the movement angle of the rotating member according to the comparison result, and further control the movement angle of the dial piece, so as to stabilize the wind speed of the main spiral wind and the auxiliary spiral wind, i.e., to maintain the wind speed of the main and auxiliary spiral winds in the optimal interval at all times, effectively avoid the intensification of concentration polarization or insufficient uniformity of oxygen reduction caused by unstable wind speed, and ensure the stability and consistency of the membrane separation efficiency; without the need for additional high-power regulation components, the fine wind speed control is realized while the energy saving is taken into account, and the overall operation reliability and preservation effect of the oxygen reduction assembly are further improved.

[0066] By way of example, the control system refers to a functional component specially used for receiving the rotation speed signal, performing rotation speed comparison analysis, and outputting the control instruction; the electrical connection refers to the signal transmission and power transmission between the control system and the Hall sensor and the rotating member through the circuit, ensuring real-time feedback of the rotation speed data and timely execution of the control instruction; the actual rotation speed refers to the current rotation speed of the rotating component calculated by the Hall sensor detection; the preset rotation speed refers to the optimal rotation speed reference value of the rotating component preset according to the nitrogen-oxygen separation efficiency and the oxygen reduction demand; the movement angle of the rotating member refers to the angle change of the rotating member under the instruction of the control system, which directly drives the movement of the paddle; the movement angle of the paddle refers to the included angle between the paddle and the inner wall of the secondary air duct changed under the driving of the rotating member, and the angle change directly changes the flow passage width of the secondary air duct, thereby controlling the airflow velocity to stabilize the main and secondary spiral air velocities.

[0067] In this way, the actual rotation speed of the rotating component is obtained by the Hall sensor, the actual rotation speed is compared with the preset rotation speed, the movement angle of the rotating member is controlled according to the difference resulting from the comparison, the paddle adjusts its own angle, and finally the stable control of the main and secondary spiral air velocities is realized, ensuring that the airflow state adapts to the nitrogen-oxygen separation demand.

[0068] In some embodiments, the Hall sensor calculates the revolutions per minute of the rotating component according to the pulse frequency, which is used for accurately feeding back the rotation speed information of the rotating component.

[0069] By way of example, the pulse frequency refers to the number of pulse signals generated by the rotation of the permanent magnet received by the Hall sensor within a unit time, which is a core parameter reflecting the speed of the rotating component; the revolutions per minute refer to the number of rotations completed by the rotating component within one minute, which is a quantitative expression of the rotation speed of the rotating component; the calculation of the revolutions per minute by the Hall sensor according to the pulse frequency refers to that the Hall sensor obtains the number of rotations per minute of the rotating component by counting the number of pulses within a unit time and combining the time conversion relationship; the accurate feedback of the rotation speed information refers to that the revolutions per minute output by the Hall sensor can truly and accurately reflect the current rotation state of the rotating component without obvious deviation, which can be directly used as a control basis.

[0070] In this way, the design of calculating the revolutions per minute by the pulse frequency realizes the accurate quantitative feedback of the rotation speed of the rotating component, solves the problem of lack of accurate basis for control caused by the fuzzy rotation speed feedback of the traditional device, and enables the control system to accurately obtain the actual running state of the rotating component, thereby providing reliable data support for subsequent dynamic adjustment of the airflow velocity of the secondary air duct and stabilization of the spiral air velocity.

[0071] In some embodiments, the spiral air duct includes a spiral air duct inlet and a spiral air duct outlet; the spiral air duct inlet is communicated with the outlet of the secondary air duct for receiving the airflow flowing out of the secondary air duct; the spiral air duct outlet is arranged corresponding to the middle and rear sections of the hollow fiber membrane filaments for guiding the formed secondary spiral air to the ends of the hollow fiber membrane filaments.

[0072] For example, the spiral duct inlet refers to the end of the spiral duct specifically designed to receive airflow, which maintains unobstructed airflow with the outlet of the secondary duct, ensuring that the airflow from the secondary duct can smoothly enter the spiral duct; the spiral duct outlet refers to the end of the spiral duct that outputs airflow, and its location corresponds to the middle and rear section of the hollow fiber membrane, enabling direct guidance of the secondary spiral airflow to the target area; the setting corresponding to the middle and rear section of the hollow fiber membrane means that the orientation and installation position of the spiral duct outlet are precisely aligned with the middle and rear part of the hollow fiber membrane along its own extension direction, ensuring that the airflow can accurately act on the end of the membrane; guiding the formed secondary spiral airflow to the end of the hollow fiber membrane means that the secondary spiral airflow is guided through the path of the spiral duct and flows directionally to the end of the hollow fiber membrane away from the air inlet cavity, supplementing the airflow intensity to that area.

[0073] In this way, the spiral duct is equipped with a spiral duct inlet and a spiral duct outlet, keeping the spiral duct inlet connected to the outlet of the secondary duct to receive the airflow from the secondary duct. At the same time, the spiral duct outlet is arranged to correspond to the middle and rear sections of the hollow fiber membrane, so that the secondary spiral airflow formed by the spiral duct can be precisely directed to the end of the hollow fiber membrane, specifically supplementing the airflow in that area. That is, the secondary spiral airflow acts directionally on the end of the membrane, effectively avoiding the local accumulation of nitrogen and the formation of dead zones, and improving the oxygen removal and mass transfer power. At the same time, it makes the airflow distribution more uniform throughout the membrane section, further alleviating the concentration polarization phenomenon. The terminal oxygen removal effect can be enhanced without the need for additional fans. While ensuring the uniformity of oxygen removal, it also takes energy saving into account, significantly improving the overall separation efficiency and system stability.

[0074] In some embodiments, the flow width of the main air duct is greater than that of the secondary air duct, so that a medium-speed airflow is formed in the main air duct and a high-speed airflow is formed in the secondary air duct. The high-speed airflow is used to drive the rotating component to rotate, and the medium-speed airflow is used to form a main spiral wind to wash the surface of the membrane fibers.

[0075] For example, the flow width of the main air duct is greater than that of the secondary air duct, meaning that the effective channel size allowing airflow to pass through the main air duct is larger than the corresponding size of the secondary air duct, providing structural support for the formation of two different airflow velocities. Medium-speed airflow means that the airflow velocity in the main air duct is at a moderate level, which can form a stable spiral wind without causing fruits and vegetables to lose water due to excessive flow velocity. High-speed airflow means that the airflow velocity in the secondary air duct is faster, with sufficient driving force to drive the rotating component to rotate. High-speed airflow is used to drive the rotating component to rotate, meaning that the high-speed airflow directly acts on the arc-shaped fan blades of the rotating component, generating sufficient force to make the rotating component rotate stably around its own axis. Medium-speed airflow is used to form the main spiral wind to scour the membrane fiber surface, meaning that the medium-speed airflow enters the interior through the air inlet of the rotating component and is ejected from the jet hole. Driven by the rotation of the rotating component, it forms a spiral airflow that continuously sweeps across the surface of the hollow fiber membrane fiber, realizing the gas renewal of the membrane surface.

[0076] In this way, the width of the main and auxiliary air ducts is designed to be different, without the need for additional driving components to form airflow with adaptive functions, solving the problem that the airflow speed of traditional devices is single and the driving and flushing requirements are difficult to balance. The high-speed airflow ensures the stable rotation of the rotating assembly, the medium-speed main spiral airflow can continuously flush the surface of the membrane filament, effectively alleviate the concentration polarization phenomenon, prolong the contact time of the raw material gas and the membrane filament, and improve the membrane area utilization rate; at the same time, the high energy consumption caused by high-power driving is avoided, the energy saving is considered while ensuring the separation efficiency, and the overall operation rationality of the oxygen reduction assembly is improved.

[0077] In some embodiments, the fixing member is fixedly connected with the inner wall of the shell, and the partition plate is sealingly connected with the inner wall of the shell.

[0078] For example, the fixed connection of the fixing member with the inner wall of the shell means that the fixing member and the inner wall of the shell are connected by a stable assembly mode, the relative position of the two is kept unchanged, and reliable support can be provided for the closed end of the hollow fiber membrane filament; the sealing connection of the partition plate with the inner wall of the shell means that the partition plate and the inner wall of the shell are tightly fitted, forming a connection state without gas leakage, which can completely block the gas flow communication between the exchange cavity and the oxygen storage cavity.

[0079] In this way, the stable connection of the fixing member effectively prevents the hollow fiber membrane filament from shaking or shifting under the flushing of the airflow, ensures uniform contact of the membrane filament with the airflow, and improves the membrane area utilization rate; the sealing connection of the partition plate completely blocks the gas flow between the exchange cavity and the oxygen storage cavity, avoids the mixing of oxygen-rich gas and nitrogen-rich gas to affect the separation purity, and at the same time strengthens the stability of the pressure difference inside and outside the membrane, further alleviates the concentration polarization phenomenon, improves the oxygen reduction efficiency and the reliability of system operation, and does not need additional sealing or fixing components.

[0080] The embodiments of the present disclosure also provide an oxygen reduction drawer, which comprises a drawer body and the above-mentioned oxygen reduction assembly, and the oxygen reduction assembly is integrated inside the drawer body and used for reducing the oxygen concentration in the drawer body.

[0081] For example, the drawer body refers to a storage structure for storing fruits and vegetables, which can be pulled out in the refrigerator and has sealing performance to maintain the stability of the internal gas environment; the integration of the oxygen reduction assembly inside the drawer body means that all components of the oxygen reduction assembly are installed in the internal space of the drawer body, which is adapted to the structure of the drawer body and fixed, and does not expose outside the drawer; reducing the oxygen concentration in the drawer body means that the oxygen reduction assembly separates the air in the drawer body, discharges the oxygen-rich gas therein, and retains the nitrogen-rich gas, so that the proportion of oxygen in the drawer body is continuously reduced to reach the fresh-keeping concentration standard of inhibiting the respiration of fruits and vegetables.

[0082] In this way, the integrated design of the oxygen reduction assembly and the drawer body enables the drawer to achieve independent low-oxygen preservation without relying on an additional oxygen reduction system of the refrigerator, solves the problem that the traditional refrigerator drawer is difficult to inhibit the respiration of fruits and vegetables and has a short preservation period by relying on low temperature alone, and directly acts on the inside of the drawer the advantages of uniform oxygen reduction, relief of concentration polarization, energy saving, and the like, effectively prolongs the preservation period of fruits and vegetables and maintains the quality of fruits and vegetables, while the integrated design does not occupy additional space and is suitable for the internal layout of the refrigerator.

[0083] In some embodiments, the drawer body is arranged in a refrigerating chamber of the refrigerator and is used to store fruits and vegetables, and a low-oxygen environment in the drawer body is maintained by the oxygen reduction assembly.

[0084] For example, the refrigerating chamber of the refrigerator refers to a core area in the refrigerator that is specially used for low-temperature storage of foodstuffs, and the temperature environment thereof is suitable for short-term preservation of fruits and vegetables and will not freeze the fruits and vegetables; the storage of fruits and vegetables refers to the core use of the drawer body, which is to provide independent and sealed storage space for fresh fruits and vegetables to avoid mutual influence with other foodstuffs; and the maintenance of the low-oxygen environment in the drawer body refers to the oxygen reduction assembly stably controlling the oxygen concentration in the air in the drawer to a reasonable range that can inhibit the respiration of fruits and vegetables, and the concentration does not fluctuate greatly and always maintains a low-oxygen state required for preservation.

[0085] In this way, the precise adaptation of the drawer body to the refrigerating chamber of the refrigerator enables the low-oxygen preservation function to be directly implemented, and the stable low-oxygen environment maintained by the oxygen reduction assembly effectively inhibits the respiration of fruits and vegetables, solving the problem that the traditional refrigerating chamber is difficult to prolong the preservation period by relying on low temperature alone and the fruits and vegetables are prone to spoilage; at the same time, no additional independent preservation equipment needs to be added, no additional space of the refrigerator is occupied, and the advantages of energy saving and prevention of water loss of the oxygen reduction assembly are continued, thereby significantly prolonging the preservation time of fruits and vegetables and maintaining the original quality thereof, and the core preservation performance of the refrigerator is improved.

[0086] In some embodiments, the oxygen reduction assembly cooperates with the door body and the temperature control system of the drawer body; the nitrogen-rich gas discharged from the exchange cavity flows back into the drawer body to form a circulating air flow.

[0087] For example, cooperation refers to the cooperation of the oxygen reduction function of the oxygen reduction assembly, the sealing function of the door body, and the temperature control function of the temperature control system to jointly maintain an environment suitable for the preservation of fruits and vegetables in the drawer body and to ensure that the low-oxygen state and the temperature condition are stably synchronized; the backflow of the nitrogen-rich gas into the drawer body refers to the nitrogen-rich gas separated and discharged from the exchange cavity not diffusing outward but flowing back into the inside of the drawer body to participate in the internal gas circulation; and the circulating air flow refers to the nitrogen-rich gas forming a closed-loop air flow that continuously flows between the drawer body and the oxygen reduction assembly, is continuously separated and treated by the oxygen reduction assembly, and always maintains a low-oxygen environment in the drawer body.

[0088] In this way, the oxygen reduction assembly is cooperated with the door body of the drawer body and the temperature control system to realize all-around optimization of the fresh-keeping environment. The door body guarantees the sealing of the drawer to maintain the stability of the circulating air flow, the temperature control system provides suitable low temperature, and the oxygen reduction assembly continuously separates oxygen, cooperates with the circulation of the nitrogen-rich gas, avoids waste of the gas and fluctuation of the environment, and solves the problems of disorderly gas emission and instability of the fresh-keeping environment of the traditional device. The circulating air flow uniformly distributes the oxygen concentration in the drawer, further alleviates the risk of local concentration polarization, reduces water loss of the fruits and vegetables, and better maintains the original quality of the fruits and vegetables on the basis of improving the oxygen reduction efficiency and the fresh-keeping period.

[0089] The refrigerator provided by the embodiments of the present disclosure also includes the above-mentioned oxygen reduction drawer, and all the effects of the oxygen reduction drawer are achieved, which will not be repeated here.

[0090] In order to better understand the scheme of the embodiments of the present disclosure, the following exemplary elaboration is made: The oxygen reduction assembly, the oxygen reduction drawer and the refrigerator provided by the embodiments of the present disclosure have the following advantages. The cooperation structure of the rotating assembly and the hollow fiber membrane wire is provided, the spiral wind is used on the membrane surface, the membrane surface is continuously scoured by the tangential wind force, the concentration polarization phenomenon is effectively alleviated, and the oxygen separation efficiency is improved. The double air duct structure design of the main air duct and the auxiliary air duct is used to control the air flow in different directions and flow rates respectively, to realize fine regulation and control of the air flow path, and to improve the overall oxygen reduction efficiency. The rotating speed detection system composed of the Hall sensor and the permanent magnet is used to realize closed-loop control of the spiral wind speed, so as to maintain the stability of the air flow and improve the system operation consistency. The spiral assembly generates spiral wind to increase the air flow movement path, significantly prolongs the contact time of the raw material gas and the membrane, and improves the membrane area utilization rate. The rotating air duct is arranged in sequence with the outer shell to form spiral wind supplement to the membrane wire end, to enhance the end wind force, avoid local accumulation of nitrogen, and improve the overall oxygen reduction efficiency and uniformity.

[0091] The double air duct structure design of the main air duct and the auxiliary air duct is adopted. The auxiliary air duct drives the rotating assembly without the need of motor driving. The main air duct is used to form low-speed spiral wind acting on the membrane wire, to give the hollow fiber membrane surface tangential air flow scouring, to solve the problem of concentration polarization on the membrane wire surface. The auxiliary air duct extends in the outer shell to form a sandwich rotating air duct, to form a “air flow relay” matching the spiral wind direction, to enhance the membrane wire end wind force, to realize uniform oxygen reduction of the whole membrane section. The end nitrogen accumulation problem is solved without the need of additional fan. The width of the auxiliary air duct is dynamically adjusted by real-time detection of the rotating speed of the rotating assembly, so as to stabilize the spiral wind speed and ensure the stability and consistency of the oxygen reduction process. The cylindrical outer shell + sandwich air duct is used to realize the integration of the “rotating assembly-double air duct-rotating air duct”. The rotating assembly is driven by natural air flow without the need of additional power, which is energy-efficient.

[0092] Specifically, the oxygen reduction assembly is integrated in the drawer, cooperates with the door body, temperature control system, fan system and the like of the drawer, and constitutes a complete fruit and vegetable fresh-keeping system. The main function is to selectively separate oxygen in the air through the hollow fiber membrane, thereby realizing low-oxygen fresh-keeping.

[0093] The oxygen reduction assembly mainly includes the following key components: The shell is in a cylindrical shape, and wraps the rotating assembly and the hollow fiber membrane. The bottom is provided with a main air duct, a secondary air duct and an air outlet duct. The main air duct and the secondary air duct guide the airflow to the front and side of the rotating assembly, respectively, and the air outlet duct is used to discharge the nitrogen-rich gas. The top is provided with an air exhaust pipe, one end of which is connected to the oxygen storage cavity, and the other end is connected to a vacuum pump, which is used to exhaust the oxygen-rich gas.

[0094] The hollow fiber membrane is the core element of gas separation, which separates oxygen and nitrogen in the air by selective permeation principle to form oxygen-rich and nitrogen-rich gas. It is located in the middle of the exchange cavity in the shell and arranged in the axial direction, one end is fixed to the fixed part, and the other end is fixed to the partition plate. The end fixed to the fixed part is a closed end, i.e. the raw gas cannot enter from this end, and the end fixed to the partition plate is an open end, i.e. the oxygen-rich gas after membrane separation enters the oxygen storage cavity from this end.

[0095] The rotating assembly includes a side arc-shaped fan blade and a front small hole structure, which is used to generate a spiral wind to blow to the hollow fiber membrane. It is arranged at the front end of the membrane and forms a closed space with the shell. When working, the fan sucks the air in the drawer, part of the wind passes through the secondary air duct, and the other part of the wind passes through the main air duct. The secondary air duct is relatively thin and narrow, forming high-speed wind, and the main air duct is wider, forming medium-speed wind. The secondary air duct is connected to the arc-shaped fan blade, and the high-speed wind drives the rotating assembly to rotate. The main air duct is connected to the front of the assembly, and the wind enters the assembly from the air inlet hole, and then enters the exchange cavity from the air outlet hole after rotation, forming a spiral wind to blow the hollow fiber membrane.

[0096] The push piece: since the fan speed is fixed, the speed of the raw material wind sucked is relatively fixed. However, the gas in the secondary air duct will have power loss in the process of blowing the rotating assembly, so the rotating speed of the rotating assembly will also fluctuate, which will cause the main spiral wind formed to have large fluctuations in shape and speed. The push piece is arranged inside the secondary air duct, and the angle of the push piece is adjusted by the motor to control the width of the secondary air duct, so as to adjust the speed of the high-speed wind in the secondary air duct, thereby adjusting the rotating speed of the spiral assembly, and controlling the state and speed of the spiral wind blowing to the hollow fiber membrane. According to the law of conservation of mass and Bernoulli equation, the flow rate of fluid flowing from a large pipe into a small pipe will increase. The initial state of the push piece is about 45°, and the angle can be adjusted along the axial direction to narrow or widen the secondary air duct, so as to adjust the flow rate of the gas and thereby adjust the rotating speed of the rotating assembly.

[0097] Hall sensor and magnet: the hall sensor is fixed near the rotating assembly, and the permanent magnet is installed on the arc-shaped fan blade. The magnet rotates with the rotating assembly, and outputs one pulse (1 pulse = 1 revolution) each time the magnet approaches. The hall sensor calculates the rotation speed according to the pulse frequency and feeds back to the control system. Rounds per minute (RPM) .

[0098] Spiral air duct: guide air flow to form spiral wind, enhance the wind power of the membrane filament end, and avoid local accumulation of nitrogen. The spiral air duct inlet is connected to the secondary air duct outlet and is arranged in the outer shell interlayer. It extends along the outer shell to form a spiral air duct, and the spiral air duct outlet is arranged in the rear end of the outer shell.

[0099] Working principle: Membrane separation principle: nitrogen-oxygen membrane separation technology is a physical method for air separation by utilizing the difference in solubility-diffusion of nitrogen and oxygen in a specific polymer membrane. By reducing the pressure in the membrane, oxygen continuously dissolves and diffuses in the membrane under the action of the pressure difference between the inside and outside of the membrane, and then is released in the membrane. Finally, the oxygen-rich gas is formed in the membrane, and the nitrogen-rich gas is formed outside the membrane. The oxygen-rich gas is extracted, and the nitrogen-rich gas is blown back into the preservation drawer to achieve nitrogen-oxygen separation.

[0100] Source of air flow: air flow is formed by the rotation of the fan to drive the air in the drawer to move. The air in the drawer is used for nitrogen-oxygen separation, so it is called raw material gas.

[0101] Air flow trend: the raw material gas is first sucked into the oxygen reduction device by the fan, and then divided into two air flows. One air flow enters the secondary air duct to form high-speed wind, and the other air flow enters the main air duct to form medium-speed wind. Then the high-speed wind blows to the arc-shaped fan blade on the side of the rotating assembly to rotate the assembly, and the medium-speed wind passes through the air inlet hole on the front of the rotating assembly, and then forms the main spiral wind through the air jet hole to blow to the hollow fiber membrane filament in the exchange cavity. Finally, the high-speed wind comes out from the side of the rotating assembly, enters the spiral air duct through the spiral air duct inlet, and forms the secondary spiral wind from the spiral air duct outlet into the rear end of the exchange cavity to converge with the main spiral wind.

[0102] Working process: The fan starts to suck the gas in the drawer into the outer shell. Part of the raw material gas enters the secondary air duct to form high-speed wind, which blows to the arc-shaped fan blade on the side of the rotating assembly to rotate the assembly, and then enters the spiral air duct through the spiral air duct inlet to form the secondary spiral wind from the spiral air duct outlet into the rear end of the exchange cavity. The other part of the raw material gas enters the main air duct to form medium-speed wind, which passes through the air inlet hole on the front of the rotating assembly, and then forms the main spiral wind through the air jet hole to blow to the hollow fiber membrane filament in the exchange cavity.

[0103] The vacuum pump is started simultaneously, the inside of the hollow fiber membrane is pumped to a reduced pressure state, under the action of the pressure difference between the raw gas membrane inside and outside, the hollow fiber membrane surface in the exchange cavity is dissolved, then diffused and desorbed in the hollow fiber membrane inside, to form oxygen-rich gas. Then the oxygen-rich gas is pumped into the oxygen storage cavity, and finally pumped to the outside of the drawer through the air pump pipe, reducing the oxygen concentration in the drawer. At the same time, the secondary spiral wind blown out from the spiral air duct outlet converges with the main spiral wind, enhances the overall wind power, and sends the nitrogen-rich gas in the exchange cavity back to the drawer through the air outlet duct.

[0104] In this process, the magnet rotates with the arc-shaped fan blade, and the Hall sensor calculates the rotating speed according to the pulse frequency and feeds back to the control system. The control system compares the actual rotating speed V with the preset rotating speed T (such as 3 m / s), controls the movement of the dial piece, and thus controls the stability of the spiral wind.

[0105] Table 1 control logic

[0106] It should be understood that the terms used herein are for the purpose of describing particular example embodiments and are not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0107] Although the terms first, second, third, and so on can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, the terms such as "first", "second" and other numerical terms are used herein without implying any order or sequence. Therefore, the first element, component, region, layer or section discussed below can be referred to as a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0108] The foregoing is merely illustrative of the various implementations of the present disclosure and the general principles thereof. Numerous modifications can be made to these illustrations, and equivalents can be substituted therefor, without departing from the scope of the present disclosure. The specific embodiments commensurate with the specific application are intended to be illustrative only and not limiting of the scope of the application as set forth in the following claims.

Claims

1. An oxygen-reducing component, characterized in that, include: The outer shell includes an internal cavity, which extends from its head to its tail and includes an air inlet cavity, an exchange cavity, and an oxygen storage cavity arranged sequentially and separately. A rotating component is located at the head of the internal cavity and forms a sealed space between itself and the inner wall of the outer shell to form the air inlet cavity; A combined air duct, located outside the outer casing and connected to the air inlet chamber, is used to provide an inflow path for the raw material gas to flow into the outer casing; Hollow fiber membrane filaments are disposed in the exchange chamber. One end of the hollow fiber membrane filaments is kept in sealed communication with the air inlet chamber, and the other end of the hollow fiber membrane filaments is kept in sealed communication with the oxygen storage chamber. At least a portion of the raw material gas entering the air inlet cavity via the combined air duct is used to drive the rotating assembly to rotate, so that the rotating assembly forms a spiral wind to sweep the hollow fiber membrane filaments. The hollow fiber membrane filaments are used to selectively separate nitrogen and oxygen from the raw material gas. The separated oxygen-enriched gas flows from the hollow fiber membrane filaments to the oxygen storage cavity and is discharged from the oxygen storage cavity to the outside of the outer shell.

2. The oxygen reduction component according to claim 1, characterized in that, The combined air duct includes two parallel and separated main air ducts and secondary air ducts. The outlet of the secondary air duct is located facing the outer periphery of the rotating component, and the outlet of the main air duct blows tangentially to the front of the rotating component. The airflow from the secondary air duct is used to drive the rotating component to rotate around its own axial direction. The airflow from the main air duct forms a main spiral wind through the rotating component, and the main spiral wind is used to tangentially scour the surface of the hollow fiber membrane.

3. The oxygen reduction component according to claim 2, characterized in that, The oxygen reduction component also includes a spiral air duct, which is disposed in the shell wall interlayer of the outer shell. The inlet of the spiral air duct is connected to the secondary air duct, and the outlet of the spiral air duct is located at the rear end of the exchange chamber. It is used to form a secondary spiral wind by the airflow flowing out of the secondary air duct to supplement the wind force at the end of the hollow fiber membrane filament.

4. The oxygen reduction component according to claim 3, characterized in that, The spiral air duct is arranged in a spiral shape along the extension direction of the outer shell. The wind direction of the secondary spiral air is matched with that of the main spiral air, so that the two airflows work together to scour the exchange chamber and prolong the contact time between the raw material gas and the membrane fibers.

5. The oxygen reduction component according to claim 3, characterized in that, The outer shell is cylindrical in shape, with an air outlet duct at the bottom that communicates with the exchange chamber and an air extraction pipe at the top that communicates with the oxygen storage chamber. The oxygen storage chamber is used to temporarily store oxygen-enriched gas after membrane separation, and the air outlet duct is used to discharge nitrogen-enriched gas after membrane separation.

6. The oxygen reduction component according to claim 5, characterized in that, The oxygen reduction assembly also includes a fan and a vacuum pump; The fan is connected to the inlet of the main air duct and the secondary air duct, and is used to draw in external gas to form raw material gas for nitrogen-oxygen separation; The vacuum pump is connected to the end of the extraction pipe away from the oxygen storage chamber, and is used to draw the inside of the hollow fiber membrane to a reduced pressure state, providing pressure difference conditions for nitrogen-oxygen separation.

7. The oxygen reduction component according to claim 6, characterized in that, The oxygen-enriched gas formed by the separation of the hollow fiber membrane fibers enters the oxygen storage chamber through its open end, and is then drawn to the outside by the vacuum pump through the extraction pipe; the nitrogen-enriched gas formed by the separation is discharged to the external environment through the exhaust duct under the synergistic effect of the main spiral wind and the auxiliary spiral wind.

8. The oxygen reduction component according to claim 5, characterized in that, The hollow fiber membrane filaments are arranged axially along the exchange chamber in the central region, and the oxygen reduction assembly also includes a fixing element and a partition. The fixing member is located at the end of the exchange chamber away from the oxygen storage chamber and is used to fix the closed end of the hollow fiber membrane filament; The partition is located at one end of the exchange chamber near the oxygen storage chamber to separate the exchange chamber from the oxygen storage chamber, and the open end of the hollow fiber membrane is installed on the partition and communicates with the oxygen storage chamber.

9. The oxygen reduction component according to claim 2, characterized in that, The rotating assembly includes an arc-shaped fan blade on the side, an air inlet on the front, and an air jet hole facing the hollow fiber membrane filament; the arc-shaped fan blade is arranged opposite to the air outlet of the secondary air duct and is used to receive the airflow flowing out of the secondary air duct to drive the rotating assembly to rotate; the air inlet is connected to the air outlet of the main air duct, and the airflow enters the interior of the rotating assembly through the air inlet and is ejected from the air jet hole to form the main spiral wind.

10. The oxygen reduction component according to claim 9, characterized in that, The jet holes are evenly distributed on the side of the rotating assembly facing the hollow fiber membrane, so that the main spiral air acts evenly on the surface of the hollow fiber membrane.

11. The oxygen-reducing component according to claim 9, characterized in that, The secondary air duct is equipped with a lever, which can be adjusted in angle by moving along the axial direction of the secondary air duct via a rotating component. This lever is used to adjust the airflow speed in the secondary air duct by narrowing or widening the flow width of the secondary air duct, thereby adjusting the rotation speed of the rotating component.

12. The oxygen reduction component according to claim 11, characterized in that, The initial angle of the lever is about 45°. By moving it along the axial direction, the angle can be adjusted to continuously adjust the flow width of the secondary air duct, thereby adapting to different speed requirements.

13. The oxygen reduction component according to claim 11, characterized in that, The oxygen reduction component also includes a rotation speed detection unit, which includes a permanent magnet and a Hall sensor. The permanent magnet is mounted on the arc-shaped fan blade to rotate synchronously with the rotating component. The Hall sensor is installed inside the housing and located close to the rotating component to detect the rotation pulses of the permanent magnet in order to calculate the actual rotation speed of the rotating component.

14. The oxygen reduction component according to claim 13, characterized in that, The oxygen reduction component also includes a control system, which is electrically connected to the Hall sensor and the rotating component. The control system is used to compare the actual rotation speed with the preset rotation speed, control the movement angle of the rotating component based on the comparison result, and then control the movement angle of the paddle to stabilize the wind speed of the main spiral wind and the secondary spiral wind.

15. The oxygen reduction component according to claim 13, characterized in that, The Hall sensor calculates the number of revolutions per minute of the rotating component based on the pulse frequency, and is used to accurately provide feedback on the rotational speed of the rotating component.

16. The oxygen reduction component according to claim 2, characterized in that, The spiral duct includes a spiral duct inlet and a spiral duct outlet; the spiral duct inlet is connected to the outlet of the secondary duct and is used to receive the airflow flowing out of the secondary duct; the spiral duct outlet is provided corresponding to the middle and rear section of the hollow fiber membrane and is used to guide the formed secondary spiral airflow to the end of the hollow fiber membrane.

17. The oxygen reduction component according to claim 2, characterized in that, The main air duct has a wider flow width than the secondary air duct, so that a medium-speed airflow is formed in the main air duct and a high-speed airflow is formed in the secondary air duct. The high-speed airflow is used to drive the rotating component to rotate, and the medium-speed airflow is used to form a main spiral wind to wash the surface of the membrane fibers.

18. The oxygen reduction component according to claim 8, characterized in that, The fastener is fixedly connected to the inner wall of the outer casing, and the partition is sealed to the inner wall of the outer casing.

19. An oxygen-reducing drawer, characterized in that, The invention includes a drawer body and an oxygen-reducing component as described in any one of claims 1-18, wherein the oxygen-reducing component is integrated inside the drawer body for reducing the oxygen concentration inside the drawer body.

20. The oxygen-reducing drawer according to claim 19, characterized in that, The drawer body is located in the refrigerator compartment and is used to store fruits and vegetables. The oxygen reduction component maintains a low-oxygen environment inside the drawer body.

21. The oxygen-reducing drawer according to claim 19, characterized in that, The oxygen reduction component works in conjunction with the drawer door and temperature control system; the nitrogen-rich gas discharged through the exchange chamber flows back into the drawer body, forming a circulating airflow.

22. A refrigerator comprising an oxygen-reducing drawer as claimed in any one of claims 19-21.

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