Pressure swing adsorption oxygen removal device, fresh-keeping device and refrigerator

Abstract

This invention discloses a pressure swing adsorption (PSA) deoxygenation device, a preservation device, and a refrigerator. The PSA deoxygenation device includes an adsorption module, an oxygen removal module, and a nitrogen removal module. The adsorption module is equipped with an inlet pipe. The oxygen removal module and the nitrogen removal module are both connected to the adsorption module. The oxygen removal module is equipped with an oxygen removal pipe and a throttling component. The nitrogen removal module is equipped with a nitrogen removal pipe. The inlet pipe and the nitrogen removal pipe are connected to a storage space. The volume of the storage space is V0. After the PSA deoxygenation device has been running for n minutes, the oxygen volume fraction in the storage space is C. n The total amount of gas discharged from the oxygen exhaust pipe from n-1 minutes to n minutes is V. Based on V0 and the set number of minutes n, the exhaust volume V of the oxygen exhaust pipe is controlled by a throttling device. Multiple values ​​of V are tested, and the lowest C is obtained by comparing multiple sets of test data. n The throttling components are designed according to the lowest C. n By setting the parameters accordingly, the deoxygenation efficiency can be improved without the need for a large-volume pressure swing adsorption (PSA) deoxygenation device, which helps reduce costs.

Description

Technical Field

[0001] This invention relates to the field of refrigeration and preservation equipment technology, and particularly to a pressure swing adsorption deoxygenation device, a preservation device, and a refrigerator. Background Technology

[0002] Deoxygenation devices are commonly used in refrigeration and preservation equipment such as refrigerators. They remove oxygen from the storage space, creating a low-oxygen environment. This low-oxygen environment effectively inhibits the respiration of fruits and vegetables, reducing the consumption of organic matter. It also allows the cells of fruits and vegetables to breathe slowly, maintaining cell vitality and preserving their excellent flavor and aroma. The low-oxygen environment can also inhibit the activity of certain enzymes, suppress ethylene production, delay ripening and aging, and increase the shelf life of fruits and vegetables. In addition, the low-oxygen environment can effectively inhibit the growth and reproduction of aerobic bacteria, preventing the spoilage of fruits and vegetables.

[0003] In related technologies, deoxygenation devices directly discharge oxygen outside the storage space. To improve the deoxygenation efficiency of deoxygenation devices, the deoxygenation device is usually enlarged, resulting in a large size and high cost, which is not conducive to production. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a pressure swing adsorption (PSA) deoxygenation device that can improve deoxygenation efficiency by controlling the oxygen exhaust flow rate.

[0005] The present invention also proposes a preservation device and a refrigerator having the above-mentioned pressure swing adsorption deoxygenation device.

[0006] According to a first aspect of the present invention, a pressure swing adsorption (PSA) deoxygenation device includes an adsorption module, an oxygen removal module, and a nitrogen removal module. The adsorption module is provided with an inlet pipe. The oxygen removal module and the nitrogen removal module are both connected to the adsorption module. The oxygen removal module is provided with an oxygen removal pipe and a throttling component. The nitrogen removal module is provided with a nitrogen removal pipe. The inlet pipe and the nitrogen removal pipe are connected to a storage space. The volume of the storage space is V0, and the oxygen volume fraction in the storage space after the PSA deoxygenation device has been running for n minutes is C. n The total amount of gas discharged from the oxygen exhaust pipe from n-1 minutes to n minutes is V. n is set, and V is controlled by the throttling component to reduce C. n The value.

[0007] The pressure swing adsorption (PSA) deoxygenation device according to embodiments of the present invention has at least the following beneficial effects: Based on the storage space volume V0 of the PSA deoxygenation device and the set number of minutes n, the exhaust volume V of the exhaust pipe is controlled by a throttling component. Multiple values ​​of V are tested, and the lowest C is obtained by comparing multiple sets of test data. nThe throttling components are designed according to the lowest C. n The system is designed to improve deoxygenation efficiency. It has a simple structure and does not require a large-volume pressure swing adsorption (PSA) deoxygenation device, which helps reduce costs.

[0008] According to some embodiments of the first aspect of the present invention, V and V0 satisfy: 0.25%V0≤V≤2.5%V0.

[0009] According to some embodiments of the first aspect of the present invention, the pressure swing adsorption deoxygenation device according to claim 1 is characterized in that the exhaust flow rate of the oxygen discharge pipe is Q, which satisfies 0.2L / min≤Q≤0.5L / min.

[0010] According to some embodiments of the first aspect of the present invention, an oxygen sensor is provided on the oxygen discharge pipe. The throttling component includes a throttling valve and a flow meter.

[0011] According to some embodiments of the first aspect of the present invention, the pressure swing adsorption deoxygenation device further includes a controller, wherein the oxygen sensor, the throttling valve and the flow meter are all electrically connected to the controller.

[0012] According to some embodiments of the first aspect of the present invention, an air pump is provided on the air intake pipe.

[0013] According to some embodiments of the first aspect of the present invention, the pressure swing adsorption deoxygenation device has two sets of adsorption modules, the inlet pipe is connected to a first solenoid valve, the first solenoid valve is connected to a first gas distribution pipe and a second gas distribution pipe, and the first gas distribution pipe and the second gas distribution pipe are respectively connected to one set of adsorption modules.

[0014] According to some embodiments of the first aspect of the present invention, the second gas distribution pipe is connected to a branch pipe, the branch pipe is connected to a second solenoid valve, the second solenoid valve is connected to a third gas distribution pipe and a fourth gas distribution pipe, the third gas distribution pipe and the first gas distribution pipe are connected to the same group of adsorption modules, and the fourth gas distribution pipe is connected to the nitrogen removal module.

[0015] According to a second aspect of the present invention, a preservation device includes a storage box and a pressure swing adsorption (PSA) deoxygenation device as described in the first aspect. The air inlet pipe and the nitrogen exhaust pipe of the PSA deoxygenation device are connected to the storage box, and the interior of the storage box is the storage space. When the PSA deoxygenation device is running, air is drawn into the storage space through the air inlet pipe, and nitrogen and oxygen are separated by the adsorption module. Oxygen is discharged to the outside through the oxygen exhaust pipe of the oxygen exhaust module, and nitrogen is transported back to the storage space through the nitrogen exhaust pipe of the nitrogen exhaust module. A low-oxygen environment is formed in the storage space, which is beneficial for preserving fruits, vegetables and other food ingredients.

[0016] The pressure swing adsorption (PSA) deoxygenation unit controls the exhaust volume of the exhaust pipe through a throttling device, and, based on the storage space volume V0 of the PSA deoxygenation unit and the set number of minutes n, uses C. n =(V0×C n-1 -V×C x The minimum C is calculated by comparing multiple sets of data (+V×20.9%) / V0. n The throttling component is designed according to the lowest C. n The system is designed to improve deoxygenation efficiency. It has a simple structure and does not require a large-volume pressure swing adsorption (PSA) deoxygenation device, which helps reduce costs.

[0017] A refrigerator according to a third aspect of the present invention includes the preservation device described in the second aspect of the present invention.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Additional aspects and advantages of the invention will become apparent and readily understood in conjunction with the following description of the embodiments, in which:

[0020] Figure 1 This is a schematic diagram of the structure of a pressure swing adsorption deoxygenation device according to a first aspect embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the operation of the pressure swing adsorption deoxygenation device according to the first aspect of the present invention. Figure 1 ;

[0022] Figure 3 This is a schematic diagram of the operation of the pressure swing adsorption deoxygenation device according to the first aspect of the present invention. Figure 2 ;

[0023] Figure 4 This is a schematic diagram of the structure of a refrigerator according to a third aspect embodiment of the present invention;

[0024] Figure 5 This is the dot-line graph corresponding to Table 1.

[0025] The attached icons are numbered as follows:

[0026] Adsorption module 100, dewatering tower 110, air pipe 111, adsorption tower 120, air outlet pipe 121, air inlet pipe 130, air pump 140, first solenoid valve 150, first air distribution pipe 151, second air distribution pipe 152, second solenoid valve 160, third air distribution pipe 161, and fourth air distribution pipe 162;

[0027] Oxygen venting module 200, oxygen storage tank 210, oxygen venting pipe 220, throttling component 230;

[0028] Nitrogen venting module 300, nitrogen storage tank 310, nitrogen venting pipe 320;

[0029] Storage box 400. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0032] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0033] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0034] Understandably, a refrigerator is a refrigeration device that maintains a constant low temperature, keeping food and other items at a constant low temperature. Currently, users frequently use the low-temperature environment of refrigerators to preserve ingredients such as fruits, vegetables, and meats. For fruits and vegetables, they enter a ripening process immediately after harvesting, causing their skin to wilt and develop spots. While the low temperature of refrigeration or freezing can slow down the ripening process to some extent, the oxygen in the storage space will still accelerate the spoilage of fruits and vegetables. For meat, oxygen easily accelerates fat oxidation, thus speeding up its decay. Relying solely on low temperatures results in a short shelf life for food. Therefore, modified atmosphere packaging (MAP) technology has been developed. MAP removes oxygen from the storage space, creating a low-oxygen environment. This environment effectively inhibits the respiration of fruits and vegetables, reducing the consumption of organic matter. It also allows the cells of fruits and vegetables to breathe slowly, maintaining cell vitality and preserving their excellent flavor and aroma. Furthermore, the low-oxygen environment inhibits the activity of certain enzymes, suppresses ethylene production, and slows down ripening and aging processes, thus extending the shelf life of fruits and vegetables. In addition, the low-oxygen environment effectively inhibits the growth and reproduction of aerobic bacteria, preventing food spoilage and further increasing shelf life.

[0035] In related technologies, refrigerator deoxygenation devices are typically enlarged to improve their deoxygenation efficiency, resulting in large size and high cost, which is detrimental to production.

[0036] Reference Figure 1 The first aspect of the present invention provides a pressure swing adsorption (PSA) deoxygenation device, which includes an adsorption module 100, an oxygen removal module 200, and a nitrogen removal module 300. The adsorption module 100 has a dehydration tower 110 and an adsorption tower 120, which are connected by a vent pipe 111. The oxygen removal module 200 includes an oxygen storage tank 210 and an oxygen removal pipe 220, and the nitrogen removal module 300 includes a nitrogen storage tank 310 and a nitrogen removal pipe 320. The inlet end of the adsorption module 100 is connected to an inlet pipe 130 and a return pipe, and the outlet end of the adsorption module 100 is connected to the oxygen storage tank 210 through an outlet pipe 121. The return pipe is connected to the nitrogen storage tank 310. A throttling component 230 is provided on the oxygen removal pipe 220, which can control the exhaust flow rate of the oxygen removal pipe 220.

[0037] Understandably, in a pressure swing adsorption (PSA) deoxygenation device, the inlet pipe 130 and the nitrogen venting pipe 320 are connected to a storage space. The PSA draws in air from the storage space through the inlet pipe 130. The adsorption module 100 adsorbs nitrogen while allowing oxygen to pass through. Oxygen then enters the oxygen storage tank 210 through the outlet pipe 121 and is discharged outside the storage space through the venting pipe 220. The adsorbed nitrogen, after desorption, enters the nitrogen storage tank 310 through the return pipe and is then transported back to the storage space through the venting pipe 320. By using the PSA to remove oxygen from the storage space, a low-oxygen environment is created, extending the storage time of fruits, vegetables, and other food items.

[0038] When a pressure swing adsorption (PSA) deoxygenator is operating, the amount of remaining oxygen in the storage space is calculated in one-minute increments: the amount of oxygen in the previous minute minus the amount of oxygen removed in the previous minute. This can be expressed by the formula: V0 × C. n =V0×C n-1 -V×(C x -20.9%), in the formula, V0 is the volume of the storage space, C n C represents the oxygen volume fraction in the storage space after the pressure swing adsorption (PSA) deoxygenation unit has been running for n minutes. n-1 Let V be the volume fraction of oxygen in the storage space after the pressure swing adsorption (PSA) deoxygenation unit has been running for n-1 minutes, and C be the total amount of gas discharged from the exhaust pipe 220 within one minute from n-1 minutes to n minutes. x Let V be the oxygen volume fraction, and 20.9% be the oxygen volume fraction percentage of normal air. Understandably, the ultimate goal is that after the pressure swing adsorption (PSA) deoxygenation unit has been running for n minutes, C... n To obtain the minimum value, n is set according to usage requirements, and the formula is obtained after conversion: C n =(V0×C n-1 -V×C x +V×20.9%) / V0, where V0 and V are in units of L and C respectively. n C n-1 And C x All figures are percentages.

[0039] It is understandable that, given the same n and V0, the smaller the value of V, the greater the value of C. x The larger V is, the more C becomes. x The smaller the value. If the total exhaust volume V is too small, although the volume fraction of oxygen C in the exhaust gas will be lower... x The exhaust volume is relatively large, but the total amount of oxygen discharged is relatively small, resulting in low overall deoxygenation efficiency; if the total exhaust volume V is too large, the oxygen volume fraction C in the discharged gas will be high. x The overall oxygen reduction efficiency is also not high due to its relatively small V value. Therefore, there exists a V value that can achieve the optimal C value after the pressure swing adsorption deoxygenation device has been running for n minutes. nThe value of V can be controlled by adjusting the flow rate using the throttling component 230 on the oxygen exhaust pipe 220, thereby improving the deoxygenation efficiency of the pressure swing adsorption deoxygenation device. This reduces the oxygen content in the storage space to a lower level, helping to extend the storage time and preserve the freshness of fruits and vegetables. The exhaust flow rate of the oxygen exhaust pipe 220 is defined as Q, and we know that Q = V / 1min. Therefore, the value of Q is equal to the value of V. Table 1 below shows multiple sets of experimental data with n set to 30min and V0 to 20L.

[0040] Table 1

[0041]

[0042] Reference Figure 4 According to the data in Table 1, at a flow rate of Q = 0.3 L / min, after the pressure swing adsorption deoxygenation unit runs for 30 minutes, C n To minimize the amount of oxygen remaining in the storage space, a better low-oxygen environment can be achieved. Understandably, not all data is recorded in Table 1.

[0043] Therefore, before leaving the factory, the pressure swing adsorption (PSA) deoxygenation unit determines n and V0 based on the operating environment, controls the exhaust volume of the oxygen exhaust pipe 220 through the throttling component 230, conducts multiple sets of tests, and selects the optimal C based on the test results. n Then adjust the throttling component 230 to the optimal C. n With the corresponding opening degree, users can achieve optimal deoxygenation efficiency and effect without adjustment when using the pressure swing adsorption (PSA) deoxygenation device, making it more convenient to use. The PSA deoxygenation device of the first aspect of this invention controls the exhaust flow rate through the throttling component 230, thereby improving deoxygenation efficiency and obtaining a low-oxygen environment with lower oxygen content, without the need for a large-volume PSA deoxygenation device, which helps reduce production costs.

[0044] It is understandable that V and V0 satisfy the condition: 0.25%V0≤V≤2.5%V0. Testing within this range can drive a relatively effective oxygen removal effect. The exhaust flow rate of the oxygen removal pipe 220 is controlled by the throttling device 230. The exhaust flow rate Q of the oxygen removal pipe 220 is equal to the value of V, with Q in L / min. During the test, corresponding to 0.25%V0≤V≤2.5%V0, the value range of Q is 0.05L / min≤Q≤0.5L / min. For example, multiple sets of tests can be conducted with Q = 0.1L / min, Q = 0.2L / min, Q = 0.3L / min, Q = 0.4L / min, and Q = 0.5L / min, or further subdivided into multiple sets of tests with 0.5min intervals. The optimal C is selected based on the test structure. nThen, the throttling component 230 is adjusted to the corresponding opening degree. Users can achieve better deoxygenation efficiency and deoxygenation effect without adjustment when using the pressure swing adsorption deoxygenation device, making it more convenient to use.

[0045] It is understandable that an oxygen sensor (not shown in the figure) is installed on the oxygen exhaust pipe 200 to detect C in real time. x During the test of the pressure swing adsorption deoxygenation device, the oxygen sensor detected C... x The numerical value allows for real-time monitoring of the oxygen content in exhaust gas. An oxygen sensor uses a ceramic sensing element to measure the oxygen potential in the exhaust pipe and calculates the corresponding oxygen concentration based on the principle of chemical equilibrium, thus monitoring the oxygen content in the exhaust gas.

[0046] Understandably, the throttling component 230 includes a throttling valve, which controls fluid flow by changing the throttling cross-section or throttling length. The throttling valve lacks flow negative feedback and cannot compensate for speed instability caused by load changes; it is generally used in applications where load changes are small or speed stability requirements are not high. The throttling component 230 also includes a flow meter (not shown in the figure), which is an instrument for measuring gas flow and is installed on the exhaust pipe 220 to record the total amount of gas flowing through. The throttling component 230 uses the throttling valve to control the exhaust flow of the exhaust pipe 220, and can set different values ​​for V, while simultaneously using the flow meter to detect the value of V in real time.

[0047] It is understood that the pressure swing adsorption (PSA) deoxygenation device has a controller (not shown in the figure). The controller is electrically connected to the oxygen sensor, throttle valve, and flow meter. The controller has a display screen that can display data and input set values. The controller receives and stores data from the oxygen sensor, throttle valve, and flow meter. It is also understood that the inlet pipe 130 is connected to an air pump 140, which draws air from the storage space. The air pump 140 can provide greater air pressure and volume, which is beneficial for the adsorption tower 120 to adsorb nitrogen. The air pump 140 is also electrically connected to the controller, which controls its operation.

[0048] Reference Figure 1It is understood that the pressure swing adsorption deoxygenation device uses two sets of adsorption modules 100, which are arranged in a cross pattern. The end of the inlet pipe 130 is connected to a first solenoid valve 150. The first solenoid valve 150 has two outlets, so a first gas distribution pipe 151 and a second gas distribution pipe 152 are provided. The first gas distribution pipe 151 is connected to the dehydration tower 110 of the first adsorption module 100, and the second gas distribution pipe 152 is connected to the dehydration tower 110 of the second adsorption module 100. By controlling the first solenoid valve 150, the gas in the inlet pipe 130 can be input into the first adsorption module 100 or the second adsorption module 100. The outlet pipes 121 of the first adsorption module 100 and the second adsorption module 100 are simultaneously connected to the oxygen storage tank 210. The second gas distribution pipe 152 is provided with a branch pipe 153. The end of the branch pipe 153 is connected to a second solenoid valve 160. The second solenoid valve 160 also has two gas outlets. Therefore, a third gas distribution pipe 161 and a fourth gas distribution pipe 162 are provided. The third gas distribution pipe 161 is connected to the water removal tower 110 of the first adsorption module 100, and the fourth gas distribution pipe 162 is connected to the nitrogen storage tank 310.

[0049] It is understandable that during the operation of the pressure swing adsorption deoxygenation unit, reference should be made to... Figure 2 When the air pump 140 starts, it draws air from the storage space. The first solenoid valve 150 connects the inlet pipe 130 to the first branch pipe 151. The air in the inlet pipe 130 enters the first adsorption module 100, where it adsorbs nitrogen through the dehydration tower 110 and adsorption tower 120. Oxygen enters the oxygen storage tank 210 through the outlet pipe 121. At this time, the second solenoid valve 160 connects the branch pipe 153 to the fourth branch pipe 162. The nitrogen adsorbed in the second adsorption module 100 is desorbed and enters the nitrogen storage tank 310 through the second branch pipe 152, the branch pipe 153, and the fourth branch pipe 162. (Refer to...) Figure 3 After the set running time, the first solenoid valve 150 switches to the inlet pipe 130, connecting to the second gas distribution pipe 152, and the second solenoid valve 160 switches to the third gas distribution pipe 161, connecting to the fourth gas distribution pipe 162. The air in the inlet pipe 130 enters the second adsorption module 100, where nitrogen is adsorbed via the dehydration tower 110 and the adsorption tower 120. Oxygen enters the oxygen storage tank 210 through the outlet pipe 121. Meanwhile, the nitrogen from the first adsorption module 100 is desorbed and enters the nitrogen storage tank 310 through the third and fourth gas distribution pipes 161 and 162. Repeating the above steps, the two adsorption modules 100 are used alternately, continuously separating oxygen and nitrogen. The oxygen in the oxygen storage tank 210 is discharged through the oxygen venting pipe 220, and the nitrogen in the nitrogen storage tank 310 is transported back to the storage space through the nitrogen venting pipe 320, reducing the oxygen content in the storage space and creating a low-oxygen environment.

[0050] A second aspect of the present invention provides a preservation device, referring to... Figure 4The preservation device includes a storage box 400 and a pressure swing adsorption (PSA) deoxygenation device according to the first aspect embodiment. The internal space of the storage box 400 is the storage space, where fruits, vegetables, and other food items are placed. The air inlet pipe 130 and the nitrogen exhaust pipe 320 of the PSA deoxygenation device are both connected to the storage space inside the storage box 400. When the PSA deoxygenation device is running, air is drawn into the storage space through the air inlet pipe 130, and nitrogen and oxygen are separated by the adsorption module 100. Oxygen is discharged to the outside through the oxygen exhaust pipe 220 of the oxygen exhaust module 200, and nitrogen is transported back to the storage space through the nitrogen exhaust pipe 320 of the nitrogen exhaust module 300. A low-oxygen environment is formed in the storage space to facilitate the preservation of fruits, vegetables, and other food items.

[0051] The pressure swing adsorption (PSA) deoxygenation device controls the exhaust volume of the exhaust pipe 220 through the throttling component 230, sets multiple V values, and uses formula C based on the storage space volume V0 of the PSA deoxygenation device and the set number of operating minutes n. n =(V0×C n-1 -V×C x The experiment was conducted using (+V×20.9%) / V0, and the lowest C was obtained by comparing multiple sets of data. n Throttling component 230 according to the lowest C n The system is designed to improve deoxygenation efficiency. It has a simple structure and eliminates the need for a large-volume pressure swing adsorption (PSA) deoxygenation device, which helps reduce production costs.

[0052] Reference Figure 4 A third aspect of this invention provides a refrigerator comprising a preservation device according to a second aspect embodiment. The preservation device includes a storage box 400 and a pressure swing adsorption (PSA) deoxygenation device according to a first aspect embodiment. The internal space of the storage box 400 is the storage space, where fruits, vegetables, and other food items are placed. The air inlet pipe 130 and the nitrogen exhaust pipe 320 of the PSA deoxygenation device are both connected to the storage space within the storage box 400. When the PSA deoxygenation device is operating, air is drawn into the storage space through the air inlet pipe 130. The adsorption module 100 separates nitrogen and oxygen. Oxygen is discharged to the outside through the oxygen exhaust pipe 220 of the oxygen exhaust module 200, while nitrogen is returned to the storage space through the nitrogen exhaust pipe 320 of the nitrogen exhaust module 300. This creates a low-oxygen environment in the storage space, which is beneficial for preserving fruits, vegetables, and other food items. The preservation device has high deoxygenation efficiency, accelerating the removal of oxygen from the storage space, which is beneficial for preserving fruits, vegetables, and other food items.

[0053] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A pressure swing adsorption deoxygenation device, characterized in that, include: An adsorption module, wherein the adsorption module is provided with an air inlet pipe; An oxygen removal module is connected to the adsorption module. The oxygen removal module is equipped with an oxygen removal pipe, and the oxygen removal pipe is equipped with a throttling component. A nitrogen removal module is connected to the adsorption module. The nitrogen removal module is equipped with a nitrogen removal pipe. The air inlet pipe and the nitrogen removal pipe are connected to the storage space. The storage space has a volume of V0, and the oxygen volume fraction in the storage space after the pressure swing adsorption deoxygenation device has been running for n minutes is C. n The total amount of gas discharged from the oxygen exhaust pipe from n-1 minutes to n minutes is V. n is set, and V is controlled by the throttling component to reduce C. n The value.

2. The pressure swing adsorption deoxygenation device according to claim 1, characterized in that, The V and V0 satisfy the condition: 0.25%V0≤V≤2.5%V0.

3. The pressure swing adsorption deoxygenation device according to claim 2, characterized in that, The exhaust flow rate of the oxygen venting pipe is Q, which satisfies 0.3L / min≤Q≤0.4L / min.

4. The pressure swing adsorption deoxygenation device according to any one of claims 1 to 3, characterized in that, An oxygen sensor is installed on the oxygen discharge pipe, and the throttling component includes a throttling valve and a flow meter.

5. The pressure swing adsorption deoxygenation device according to claim 4, characterized in that, The pressure swing adsorption deoxygenation device also includes a controller, and the oxygen sensor, the throttling valve and the flow meter are all electrically connected to the controller.

6. The pressure swing adsorption deoxygenation device according to claim 1, characterized in that, An air pump is installed on the air intake pipe.

7. The pressure swing adsorption deoxygenation device according to any one of claims 1 to 3, characterized in that, The pressure swing adsorption deoxygenation device has two sets of adsorption modules. The air inlet pipe is connected to a first solenoid valve. The first solenoid valve is connected to a first air distribution pipe and a second air distribution pipe. The first air distribution pipe and the second air distribution pipe are respectively connected to one set of adsorption modules.

8. The pressure swing adsorption deoxygenation device according to claim 7, characterized in that, The second gas distribution pipe is connected to a branch pipe, the branch pipe is connected to a second solenoid valve, the second solenoid valve is connected to a third gas distribution pipe and a fourth gas distribution pipe, the third gas distribution pipe and the first gas distribution pipe are connected to the same group of adsorption modules, and the fourth gas distribution pipe is connected to the nitrogen removal module.

9. A food preservation device, characterized in that, It includes a storage box and a pressure swing adsorption deoxygenation device as described in any one of claims 1 to 8, wherein the air inlet pipe and the nitrogen exhaust pipe are connected to the storage box.

10. A refrigerator, characterized in that, It includes the preservation device as described in claim 9.

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