Fresh-keeping drawer and refrigerator

Abstract

The utility model discloses a fresh-keeping drawer and a refrigerator, and the fresh-keeping drawer comprises a controlled atmosphere drawer which is internally provided with a nitrogen-oxygen separation assembly which is used for separating oxygen from the controlled atmosphere drawer; the gas inlet end of the nitric oxide preparation device is connected with the controlled atmosphere drawer, and the nitric oxide preparation device is used for preparing nitric oxide by adopting nitrogen in the controlled atmosphere drawer; and the nitric oxide fresh-keeping drawer is connected with the air outlet end of the nitric oxide preparation device and is used for keeping the nitric oxide prepared by the nitric oxide preparation device fresh. The problem that in the prior art, the preparation efficiency of NO gas for preservation is low is solved, and the preparation concentration and efficiency of nitric oxide are improved.

Description

Technical Field

[0001] This utility model relates to the field of refrigerator technology, and more specifically, to a food preservation drawer and a refrigerator. Background Technology

[0002] With the continuous improvement of living standards and dietary structure, people have increasingly higher requirements for the freshness and longevity of food. Refrigerators are the final point of contact for consumers to store food, and people's demand for refrigerator preservation functions is increasing day by day.

[0003] NO gas has a preservative effect on fruits and vegetables. Treating fruits and vegetables with a certain concentration of NO gas can remove ethylene, inhibit the ripening of fruits and vegetables, and extend their shelf life.

[0004] Existing nitric oxide generators for fruit and vegetable preservation have the following problems in practical applications: directly ionizing air to generate NO has low efficiency; NO is easily oxidized into NO2 in the air, affecting the effect; and polluting gases NO and NO2 are generated during NO preparation and preservation, which can easily cause damage to the environment and human health.

[0005] There is currently no effective solution to the problem of low efficiency in the preparation of NO gas for food preservation in related technologies. Utility Model Content

[0006] This invention provides a food preservation drawer and refrigerator to at least solve the problem of low efficiency in the preparation of NO gas for food preservation in the prior art.

[0007] To solve the above-mentioned technical problems, according to one aspect of the present utility model, a food preservation drawer is provided, comprising: a modified atmosphere drawer, wherein a nitrogen-oxygen separation component is provided inside the modified atmosphere drawer for separating oxygen from the modified atmosphere drawer; a nitric oxide preparation device, wherein the inlet end of the nitric oxide preparation device is connected to the modified atmosphere drawer for preparing nitric oxide using nitrogen gas inside the modified atmosphere drawer; and a nitric oxide preservation drawer, connected to the outlet end of the nitric oxide preparation device for preserving food using nitric oxide prepared by the nitric oxide preparation device.

[0008] Further, the nitrogen-oxygen separation assembly includes: a nitrogen-oxygen separation membrane assembly, an air inlet pipe, and an exhaust pipe; wherein, the air inlet pipe includes a first air inlet branch and a second air inlet branch, the first air inlet branch being connected to the air outside the controlled atmosphere drawer for nitrogen-oxygen separation using the air outside the controlled atmosphere drawer, and the second air inlet branch being connected to the internal environment of the controlled atmosphere drawer for nitrogen-oxygen separation using the gas inside the controlled atmosphere drawer to increase the nitrogen concentration inside the controlled atmosphere drawer; the exhaust pipe includes a first exhaust branch and a second exhaust branch, the first exhaust branch being connected to the air outside the controlled atmosphere drawer for discharging the separated oxygen from the controlled atmosphere drawer, and the second exhaust branch being connected to the internal environment of the nitric oxide preservation drawer for introducing the separated oxygen into the nitric oxide preservation drawer to oxidize the nitric oxide when the nitric oxide inside the nitric oxide preservation drawer needs to be oxidized.

[0009] Furthermore, it also includes: a first control valve, wherein the first intake branch and the second intake branch are connected to the nitrogen-oxygen separation membrane assembly via the first control valve, and the first control valve is used to control the intake of air through the first intake branch or the second intake branch; and a second control valve, wherein the nitrogen-oxygen separation membrane assembly is connected to the first exhaust branch and the second exhaust branch via the second control valve, and the second control valve is used to control the exhaust of air through the first intake branch or the second intake branch.

[0010] Furthermore, it also includes: a first air pump, located on the pipeline between the second control valve and the nitrogen-oxygen separation membrane assembly, for accelerating the separation of nitrogen and oxygen by the nitrogen-oxygen separation membrane assembly.

[0011] Furthermore, the nitric oxide preparation device includes: a nitric oxide preparation chamber, which uses an ion generator to prepare nitric oxide, wherein the nitric oxide preparation chamber includes an inlet end and an outlet end, the inlet end is connected to the modified atmosphere drawer, and the outlet end is connected to the nitric oxide preservation drawer, for preparing nitric oxide using nitrogen gas in the modified atmosphere drawer and introducing it into the nitric oxide preservation drawer.

[0012] Furthermore, the air inlet of the nitric oxide preparation chamber is also connected to the air outside the modified atmosphere drawer, for preparing nitric oxide using the air outside the modified atmosphere drawer; the preservation drawer also includes: a third control valve, through which the air inlet of the nitric oxide preparation chamber is connected to the modified atmosphere drawer or the air outside the modified atmosphere drawer.

[0013] Furthermore, it also includes: a second air pump located on the pipeline between the third control valve and the nitric oxide preparation chamber; a dryer located on the pipeline between the second air pump and the nitric oxide preparation chamber, used to dry the gas entering the nitric oxide preparation chamber; and a third air pump located on the pipeline between the nitric oxide preparation chamber and the nitric oxide preservation drawer.

[0014] Furthermore, it also includes: a humidifying water box, located on the outside of the nitric oxide preservation drawer, and connected to the nitric oxide preservation drawer through a humidifying port; and an atomizing device, located inside the humidifying water box, used to atomize and humidify the nitric oxide preservation drawer, and absorb nitrogen dioxide produced by the oxidation of nitric oxide in the nitric oxide preservation drawer.

[0015] Furthermore, it also includes: a fourth air pump, located inside the nitric oxide preservation drawer, with one end connected to the environment inside the nitric oxide preservation drawer and the other end connected to the environment outside the nitric oxide preservation drawer, used to discharge atomized air after atomized humidification, or to evacuate the nitric oxide preservation drawer before introducing nitric oxide.

[0016] Furthermore, it also includes: a nitrogen detector, located inside the modified atmosphere drawer, for detecting the nitrogen concentration inside the modified atmosphere drawer; a first image acquisition device, located inside the modified atmosphere drawer, for acquiring images of the preserved items inside the modified atmosphere drawer; a second image acquisition device, located inside the nitric oxide preservation drawer, for detecting images of the preserved items inside the nitric oxide preservation drawer; a first nitric oxide detector, located inside the nitric oxide preservation drawer, for detecting the nitric oxide concentration inside the nitric oxide preservation drawer; a second nitric oxide detector, located inside the nitric oxide preparation device, for detecting the nitric oxide concentration inside the nitric oxide preparation device; and a nitrogen dioxide detector, located inside the nitric oxide preservation drawer, for detecting the nitrogen dioxide concentration inside the nitric oxide preservation drawer.

[0017] According to another aspect of the present invention, a refrigerator is provided, including the preservation drawer as described above.

[0018] This invention provides a preservation drawer comprising a modified atmosphere drawer and a nitric oxide preservation drawer. The modified atmosphere drawer is equipped with a nitrogen-oxygen separation component to separate oxygen from the drawer. The nitric oxide preparation device uses high-concentration nitrogen gas from the modified atmosphere drawer to prepare nitric oxide, which is then supplied to the nitric oxide preservation drawer for preservation. This invention not only includes a modified atmosphere drawer for oxygen reduction and modified atmosphere preservation of fruits and vegetables with climacteric respiration, but also a nitric oxide preservation drawer for preserving non-climacteric fruits and vegetables. Furthermore, by using high-concentration nitrogen gas prepared by the modified atmosphere device (i.e., a nitrogen-oxygen separation membrane) as the raw material gas, it solves the problems of low efficiency and high concentration of impurities such as nitrogen dioxide in existing nitric oxide preparation processes that directly utilize air. This improves the concentration and efficiency of nitric oxide preparation, making it not only fully functional but also increasing equipment utilization and saving energy. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an optional structure of a food storage drawer according to an embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of another optional structure of the food preservation drawer according to an embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of an optional structure of a refrigerator according to an embodiment of the present utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Modified atmosphere drawer; 2. Nitric oxide preservation drawer; 3. Nitrogen detector; 4. Second image acquisition device; 5. First nitric oxide detector; 6. Nitrogen dioxide detector; 7. Humidification port; 8. Humidification water box; 9. First air intake branch; 10. Second air intake branch; 11. First control valve; 12. Nitrogen-oxygen separation membrane assembly; 13. First air pump; 14. First exhaust branch; 15. Second exhaust branch; 16. Fourth air pump; 17. Second control valve; 18. Third control valve; 19. Second air pump; 20. Dryer; 21. Nitric oxide preparation chamber; 22. Second nitric oxide detector; 23. Third air pump. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] The terminology used in the embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. The singular forms “a,” “the,” and “the” used in the embodiments of this utility model and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0026] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0027] It should be understood that although the terms first, second, third, etc., may be used to describe control valves in the embodiments of this utility model, these control valves should not be limited to these terms. These terms are only used to distinguish control valves connected to different devices. For example, without departing from the scope of the embodiments of this utility model, a first control valve may also be referred to as a second control valve, and similarly, a second control valve may also be referred to as a first control valve.

[0028] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0029] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0030] The optional embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0031] Example 1

[0032] In a preferred embodiment 1 of this utility model, a food preservation drawer is provided. Specifically, Figure 1 This diagram illustrates one possible structural design of the food storage drawer, such as... Figure 1 As shown, the food preservation drawer includes a modified atmosphere drawer 1 and a nitric oxide preservation drawer 2.

[0033] Modified atmosphere drawer 1: Mainly used for storing fruits and vegetables with climacteric respiration (apples, pears, peaches, kiwis, etc.). These fruits and vegetables experience a significant increase in respiration intensity after ripening. Therefore, by reducing oxygen and increasing nitrogen, the respiration of fruits and vegetables can be effectively inhibited, thereby inhibiting fruit and vegetable aging and extending the shelf life of fruits and vegetables.

[0034] The function of the modified atmosphere drawer 1 mainly relies on a vacuum pump and a nitrogen-oxygen separation membrane. The gas in the drawer is extracted by the vacuum pump and passed through the nitrogen-oxygen separation membrane. The nitrogen-oxygen separation membrane has different dissolution rates and passage rates for oxygen and nitrogen. Under the pressure of the vacuum pump, oxygen can pass through the membrane, while nitrogen cannot. Therefore, oxygen can be extracted from the low-oxygen modified atmosphere drawer 1, leaving nitrogen. The low-oxygen modified atmosphere drawer 1 forms a gas composition of high nitrogen and low oxygen, while the gas composition extracted by the nitrogen-oxygen separation membrane and the vacuum pump is a high concentration of oxygen.

[0035] Depending on the type of fruits and vegetables, the gas composition stored in the low-oxygen conditioning drawer 1 is adjusted to improve the preservation effect. These can be mainly divided into three categories, as shown in Table 1 below:

[0036] Table 1

[0037]

[0038] Nitric oxide preservation drawer 2: mainly used for storing non-climacteric fruits and vegetables (oranges, cherries, tomatoes, carrots, etc.). These fruits and vegetables have a slow increase in respiration after ripening. Therefore, regulating the oxygen content in the storage environment has no significant inhibitory effect on their ripening and senescence. Ethylene is a ripening gas produced during the ripening process of fruits and vegetables. Inhibiting the production of ethylene can delay the senescence of fruits and vegetables, while NO can inhibit the effect of ethylene.

[0039] Different types and stages of fruit and vegetable maturity require different doses of NO treatment, and their maximum tolerable NO concentrations also vary. Table 2 shows the required NO dose M and the maximum tolerable NO concentration Vmax for different types and stages of fruit and vegetable maturity.

[0040] Table 2

[0041]

[0042] Figure 2 The diagram shows another alternative structural design for the food storage drawer, such as... Figure 2 As shown, the food storage drawer includes:

[0043] The modified atmosphere drawer 1 is equipped with a nitrogen-oxygen separation component for separating oxygen from the modified atmosphere drawer 1.

[0044] A nitric oxide preparation device is provided, wherein the inlet end of the nitric oxide preparation device is connected to a modified atmosphere drawer 1 for preparing nitric oxide using nitrogen gas stored in the modified atmosphere drawer 1. In addition to connecting to the modified atmosphere drawer 1 to prepare nitric oxide using nitrogen gas stored in the drawer 1, the inlet end of the nitric oxide preparation device can also be connected to a nitrogen-rich gas, such as a nitrogen cylinder or other nitrogen storage device, to prepare nitric oxide using nitrogen gas. This invention solves the problem of nitrogen source by directly connecting the inlet end of the nitric oxide preparation device to the modified atmosphere drawer 1, which not only saves costs but also makes the structure more streamlined and compact.

[0045] Nitric oxide preservation drawer 2 is connected to the gas outlet of the nitric oxide preparation device and is used to preserve nitric oxide prepared by the nitric oxide preparation device.

[0046] In the above embodiments, a preservation drawer is provided, including a modified atmosphere drawer and a nitric oxide preservation drawer. The modified atmosphere drawer is equipped with a nitrogen-oxygen separation component for separating oxygen from the drawer. The nitric oxide preparation device uses high-concentration nitrogen gas from the modified atmosphere drawer to prepare nitric oxide, which is then used for preservation in the nitric oxide preservation drawer. This invention not only includes a modified atmosphere drawer for oxygen reduction and modified atmosphere preservation of fruits and vegetables with climacteric respiration, but also a nitric oxide preservation drawer for preserving non-climacteric fruits and vegetables. Furthermore, by using high-concentration nitrogen gas prepared by the modified atmosphere device (i.e., a nitrogen-oxygen separation membrane) as the raw material gas, it solves the problems of low efficiency and high concentration of impurities such as nitrogen dioxide in existing nitric oxide preparation processes that directly utilize air. This improves the concentration and efficiency of nitric oxide preparation, making it not only fully functional but also increasing equipment utilization and saving energy.

[0047] In a preferred embodiment of this utility model, the nitrogen-oxygen separation assembly includes: a nitrogen-oxygen separation membrane group 12, an air inlet pipe, and an exhaust pipe; wherein, the air inlet pipe includes a first air inlet branch 9 and a second air inlet branch 10, the first air inlet branch 9 being connected to the air outside the modified atmosphere drawer 1, for using the air outside the modified atmosphere drawer 1 for nitrogen-oxygen separation, and the second air inlet branch 10 being connected to the internal environment of the modified atmosphere drawer 1, for using the gas inside the modified atmosphere drawer 1 for nitrogen-oxygen separation, thereby increasing the nitrogen concentration inside the modified atmosphere drawer 1; the exhaust pipe includes a first exhaust branch 14 and a second exhaust branch 15, the first exhaust branch 14 being connected to the air outside the modified atmosphere drawer 1, for discharging the separated oxygen from the modified atmosphere drawer 1, and the second exhaust branch 15 being connected to the internal environment of the nitric oxide preservation drawer 2, for introducing the separated oxygen into the nitric oxide preservation drawer 2 to oxidize the nitric oxide when the nitric oxide inside the nitric oxide preservation drawer 2 needs to be oxidized.

[0048] The modified atmosphere drawer of this invention can selectively extract air or gas from a low-oxygen modified atmosphere drawer through a nitrogen-oxygen separation membrane. This allows for further nitrogen-oxygen separation within the drawer, increasing the nitrogen concentration. Additionally, it allows for the separation of high-concentration nitrogen and oxygen from outdoor air when needed. When high-concentration oxygen is required to oxidize NO in the NO preservation drawer, the high-concentration oxygen generated by the nitrogen-oxygen separation membrane enters the NO preservation drawer through the second exhaust branch. When NO oxidation is not required, the high-concentration oxygen generated by the nitrogen-oxygen separation membrane is discharged to the outside environment of the preservation drawer through the first exhaust branch 14. The nitrogen-oxygen separation membrane has two main functions: first, to extract gas from or outside the low-oxygen modified atmosphere drawer, adjusting the N2 range and maintaining it at a suitable concentration; second, to extract gas from or outside the low-oxygen modified atmosphere drawer and separate high-concentration oxygen for oxidizing NO in the NO preservation drawer. The nitrogen separated by the modified atmosphere drawer in this invention can be used to produce NO, and the separated oxygen can also be used to oxidize NO. For example, NO can be oxidized before the user opens the nitric oxide preservation drawer, thus avoiding NO pollution of the air and damage to the human body. This fully utilizes the function of the nitrogen-oxygen separation membrane group 12, improves equipment utilization, and saves the cost of the nitric oxide preservation drawer.

[0049] To control different gas sources, this invention further includes: a first control valve 11, through which the first intake branch 9 and the second intake branch 10 are connected to the nitrogen-oxygen separation membrane assembly 12. The first control valve 11 controls the intake of gas through either the first intake branch 9 or the second intake branch 10; and a second control valve 17, through which the nitrogen-oxygen separation membrane assembly 12 is connected to the first exhaust branch 14 and the second exhaust branch 15. The first control valve 11 controls the intake of gas through either the first intake branch 9 or the second intake branch 10. The first control valve 11 controls the opening and closing of the intake pipe, allowing selection of either air extraction or gas from the low-oxygen regulating drawer 1. The second control valve 17 controls the opening and closing of the exhaust pipe, allowing selection of the exhaust method.

[0050] In the above embodiments, a nitrogen-oxygen separation membrane in a controlled atmosphere device separates high-concentration N2 gas and high-concentration O2 gas. The high-concentration N2 gas can be used for oxygen-lowering controlled preservation of fruits and vegetables with climacteric respiration, and can also be used to prepare NO gas for the preservation of non-climacteric fruits and vegetables. Using high-concentration N2 to prepare NO increases the NO concentration, delays NO oxidation, improves the efficiency of NO in treating fruits and vegetables, and inhibits ethylene production, thereby preventing fruit and vegetable aging and extending shelf life. The high-concentration O2 gas can be used for NO oxidation, treating pollution, achieving the effects of multi-purpose equipment, improved efficiency, and energy saving.

[0051] like Figure 2As shown, the food storage drawer also includes a first air pump 13, located on the pipeline between the second control valve 17 and the nitrogen-oxygen separation membrane assembly 12, used to accelerate the separation of nitrogen and oxygen by the nitrogen-oxygen separation membrane assembly 12. The air pump can be a vacuum pump, which draws the gas out through the vacuum pump and through the nitrogen-oxygen separation membrane. The nitrogen-oxygen separation membrane has different dissolution rates and passage rates for oxygen and nitrogen. Under the pressure of the vacuum pump, oxygen can pass through the membrane, while nitrogen cannot. Therefore, high-concentration oxygen can be separated and discharged through the vacuum pump pipeline.

[0052] In another preferred embodiment of this invention, the nitric oxide preparation device includes a nitric oxide preparation chamber 21, which uses an ion generator to prepare nitric oxide. The nitric oxide preparation chamber 21 includes an inlet end and an outlet end. The inlet end is connected to a controlled atmosphere drawer 1, and the outlet end is connected to a nitric oxide preservation drawer 2. This chamber uses nitrogen gas from the controlled atmosphere drawer 1 to prepare nitric oxide and introduce it into the nitric oxide preservation drawer 2. NO preparation is mainly achieved through a plasma generator, which includes a pair of discharge electrodes and a high-voltage output circuit. Using nitrogen gas from the controlled atmosphere drawer 1 to prepare high-concentration nitric oxide and introducing it into the nitric oxide preservation drawer 2 increases the NO concentration, delays NO oxidation, improves the efficiency of NO treatment of fruits and vegetables, and inhibits ethylene production, thereby preventing fruit and vegetable aging and extending their shelf life.

[0053] Preferably, the air inlet of the nitric oxide preparation chamber 21 is also connected to the air outside the controlled atmosphere drawer 1, for preparing nitric oxide using air from outside the controlled atmosphere drawer 1; the preservation drawer also includes a third control valve 18, through which the air inlet of the nitric oxide preparation chamber 21 is connected to the controlled atmosphere drawer 1 or the air outside the controlled atmosphere drawer 1. The nitric oxide preparation chamber 21 can selectively extract air or gas from the low-oxygen controlled atmosphere drawer 1 to prepare nitric oxide, providing multiple sources of nitrogen for nitric oxide preparation.

[0054] In addition, it includes: a second gas pump 19, located on the pipeline between the third control valve 18 and the nitric oxide preparation chamber 21; a dryer 20, located on the pipeline between the second gas pump 19 and the nitric oxide preparation chamber 21, used to dry the gas entering the nitric oxide preparation chamber 21; and a third gas pump 23, located on the pipeline between the nitric oxide preparation chamber 21 and the nitric oxide preservation drawer 2. The dryer 20 is used to dry the gas. The second gas pump 19 is used to draw gas into the nitric oxide preparation chamber 21. The second gas pump 19 can be a vacuum pump. Since the gas drawn from the nitric oxide preservation drawer 2 is a high-humidity gas, it will condense under a certain vacuum. Therefore, a dryer 20 needs to be installed after the second gas pump to remove moisture and ensure the concentration of nitrogen and the preparation effect of nitric oxide. The third gas pump 23 is used to draw the prepared NO into the NO preservation drawer. The pressure supplied by the gas pump can accelerate the flow of gas in the pipeline and improve the preparation efficiency.

[0055] like Figure 1 As shown, the food preservation drawer of this utility model further includes: a humidifying water box 8, located on the outside of the nitric oxide preservation drawer 2, and connected to the nitric oxide preservation drawer 2 via a humidifying port 7; and an atomizing device, located inside the humidifying water box 8, used to atomize and humidify the nitric oxide preservation drawer 2, absorbing nitrogen dioxide produced by the oxidation of nitric oxide within the nitric oxide preservation drawer 2. The humidifying water box 8 is used to prepare atomized high-humidity air, mainly through ultrasonic humidification. The atomized air absorbs NO2 and is discharged from the drawer to prevent contamination. The reaction process is as follows:

[0056] 2NO + O2 = 2NO2

[0057] 2NO2 + H2O = HNO3 + HNO2

[0058] The atomized air after the reaction needs to be discharged. Therefore, the preservation drawer of this utility model also includes: a fourth air pump 16, located inside the nitric oxide preservation drawer 2, with one end connected to the internal environment of the nitric oxide preservation drawer 2 and the other end connected to the external environment of the nitric oxide preservation drawer 2. It is used to discharge the atomized air after atomization humidification, or to evacuate the nitric oxide preservation drawer 2 before introducing nitric oxide. The fourth air pump 16 has two functions: first, it is used to ventilate the NO preservation drawer, as NO2 needs to be absorbed by atomized air after NO preservation, and then the atomized air needs to be discharged into the air; second, during the NO preservation process, the air is pre-extracted by the vacuum pump to reduce NO oxidation and increase the NO concentration.

[0059] In addition, to realize the controlled atmosphere process in the controlled atmosphere drawer 1 and the nitric oxide preparation and preservation control process in the nitric oxide drawer, the device further includes: a nitrogen detector 3, located inside the controlled atmosphere drawer 1, for detecting the nitrogen concentration inside the controlled atmosphere drawer 1; a first image acquisition device, integrated with the nitrogen detector 3, located inside the controlled atmosphere drawer 1, for acquiring images of the preserved items inside the controlled atmosphere drawer 1; a second image acquisition device 4, located inside the nitric oxide preservation drawer 2, for detecting images of the preserved items inside the nitric oxide preservation drawer 2; a first nitric oxide detector 5, located inside the nitric oxide preservation drawer 2, for detecting the nitric oxide concentration inside the nitric oxide preservation drawer 2; a second nitric oxide detector 22, located inside the nitric oxide preparation device, for detecting the nitric oxide concentration inside the nitric oxide preparation device; and a nitrogen dioxide detector 6, located inside the nitric oxide preservation drawer 2, for detecting the nitrogen dioxide concentration inside the nitric oxide preservation drawer 2.

[0060] In the above embodiments, NO is prepared using high-concentration N2, increasing the NO concentration, delaying NO oxidation, improving the NO treatment efficiency on fruits and vegetables, and inhibiting ethylene production, thereby preventing fruit and vegetable aging and extending shelf life. Simultaneously, a controlled atmosphere device with a nitrogen-oxygen separation membrane is used to prepare high-N2 and high-O2 gases. The high-N2 gas can be used for oxygen-lowering controlled preservation of climacteric fruits and vegetables, and can also be used to prepare NO gas for the preservation of non-climacteric fruits and vegetables. The high-O2 gas can be used for NO oxidation, treating pollution, achieving the effects of multi-purpose equipment, improved efficiency, and energy saving.

[0061] Example 2

[0062] In a preferred embodiment 2 of this utility model, a refrigerator is provided, including the preservation drawer as described above.

[0063] Figure 3 A schematic diagram of one possible structure of the refrigerator is shown, such as... Figure 3 As shown, the refrigerator is equipped with an oxygen-regulating drawer and a nitric oxide-preserving drawer.

[0064] In the above embodiments, a preservation drawer is provided, including a modified atmosphere drawer and a nitric oxide preservation drawer. The modified atmosphere drawer is equipped with a nitrogen-oxygen separation component for separating oxygen from the drawer. The nitric oxide preparation device uses high-concentration nitrogen gas from the modified atmosphere drawer to prepare nitric oxide, which is then used for preservation in the nitric oxide preservation drawer. This invention not only includes a modified atmosphere drawer for oxygen reduction and modified atmosphere preservation of fruits and vegetables with climacteric respiration, but also a nitric oxide preservation drawer for preserving non-climacteric fruits and vegetables. Furthermore, by using high-concentration nitrogen gas prepared by the modified atmosphere device (i.e., a nitrogen-oxygen separation membrane) as the raw material gas, it solves the problems of low efficiency and high concentration of impurities such as nitrogen dioxide in existing nitric oxide preparation processes that directly utilize air. This improves the concentration and efficiency of nitric oxide preparation, making it not only fully functional but also increasing equipment utilization and saving energy.

[0065] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0066] In the above embodiments of this utility model, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0067] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0068] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0069] Furthermore, in the various embodiments of this utility model, the functional units can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0070] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this utility model, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this utility model. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0071] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art that are not covered by the invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0072] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

Claims

1. A food storage drawer, characterized in that, include: A modified atmosphere drawer, wherein a nitrogen-oxygen separation component is provided inside the modified atmosphere drawer for separating oxygen from the modified atmosphere drawer; A nitric oxide preparation apparatus, wherein the inlet end of the nitric oxide preparation apparatus is connected to the modified atmosphere drawer, and is used to prepare nitric oxide using nitrogen gas in the modified atmosphere drawer; A nitric oxide preservation drawer is connected to the gas outlet of the nitric oxide preparation device and is used for preservation of nitric oxide prepared by the nitric oxide preparation device.

2. The food preservation drawer according to claim 1, characterized in that, The nitrogen-oxygen separation assembly includes: a nitrogen-oxygen separation membrane group, an air inlet pipe, and an exhaust pipe; wherein, the air inlet pipe includes a first air inlet branch and a second air inlet branch, the first air inlet branch being connected to the air outside the controlled atmosphere drawer for nitrogen-oxygen separation using the air outside the controlled atmosphere drawer, and the second air inlet branch being connected to the internal environment of the controlled atmosphere drawer for nitrogen-oxygen separation using the gas inside the controlled atmosphere drawer to increase the nitrogen concentration inside the controlled atmosphere drawer; the exhaust pipe includes a first exhaust branch and a second exhaust branch, the first exhaust branch being connected to the air outside the controlled atmosphere drawer for discharging the separated oxygen from the controlled atmosphere drawer, and the second exhaust branch being connected to the internal environment of the nitric oxide preservation drawer for introducing the separated oxygen into the nitric oxide preservation drawer to oxidize the nitric oxide when the nitric oxide inside the nitric oxide preservation drawer needs to be oxidized.

3. The food preservation drawer according to claim 2, characterized in that, Also includes: The first control valve connects the first intake branch and the second intake branch to the nitrogen-oxygen separation membrane assembly. The first control valve is used to control the intake of air through the first intake branch or the second intake branch. The second control valve connects the nitrogen-oxygen separation membrane assembly to the first exhaust branch and the second exhaust branch. The second control valve is used to control the exhaust through the first intake branch or the second intake branch.

4. The food preservation drawer according to claim 3, characterized in that, Also includes: The first air pump, located on the pipeline between the second control valve and the nitrogen-oxygen separation membrane assembly, is used to accelerate the separation of nitrogen and oxygen by the nitrogen-oxygen separation membrane assembly.

5. The food preservation drawer according to claim 1, characterized in that, The nitric oxide preparation apparatus includes: A nitric oxide preparation chamber is provided, which uses an ion generator to prepare nitric oxide. The nitric oxide preparation chamber includes an inlet end and an outlet end. The inlet end is connected to the modified atmosphere drawer, and the outlet end is connected to the nitric oxide preservation drawer. It is used to prepare nitric oxide using nitrogen gas in the modified atmosphere drawer and introduce it into the nitric oxide preservation drawer.

6. The food preservation drawer according to claim 5, characterized in that, The air inlet of the nitric oxide preparation chamber is also connected to the air outside the controlled atmosphere drawer, for use in preparing nitric oxide using the air outside the controlled atmosphere drawer; The preservation drawer also includes a third control valve, through which the air inlet of the nitric oxide preparation chamber is connected to the modified atmosphere drawer or the air outside the modified atmosphere drawer.

7. The food preservation drawer according to claim 6, characterized in that, Also includes: The second air pump is located on the pipeline between the third control valve and the nitric oxide preparation chamber; A dryer, located on the pipeline between the second gas pump and the nitric oxide preparation chamber, is used to dry the gas entering the nitric oxide preparation chamber. The third air pump is located on the pipeline between the nitric oxide preparation chamber and the nitric oxide preservation drawer.

8. The food preservation drawer according to claim 2, characterized in that, Also includes: A humidifying water box is located on the outside of the nitric oxide preservation drawer and is connected to the nitric oxide preservation drawer through a humidifying port; The atomizing device, located inside the humidifying water box, is used to atomize and humidify the nitric oxide preservation drawer, and absorb the nitrogen dioxide produced by the oxidation of nitric oxide in the nitric oxide preservation drawer.

9. The food preservation drawer according to claim 8, characterized in that, Also includes: The fourth air pump is located inside the nitric oxide preservation drawer. One end of the pump is connected to the environment inside the nitric oxide preservation drawer, and the other end is connected to the environment outside the nitric oxide preservation drawer. It is used to discharge the atomized air after atomization and humidification, or to evacuate the nitric oxide preservation drawer before introducing nitric oxide.

10. The food preservation drawer according to claim 1, characterized in that, Also includes: A nitrogen detector, located inside the modified atmosphere drawer, is used to detect the nitrogen concentration inside the modified atmosphere drawer; The first image acquisition device is located inside the modified atmosphere drawer and is used to acquire images of the preserved items inside the modified atmosphere drawer. The second image acquisition device is located inside the nitric oxide preservation drawer and is used to detect images of the preserved items inside the nitric oxide preservation drawer. The first nitric oxide detector is located inside the nitric oxide preservation drawer and is used to detect the nitric oxide concentration inside the nitric oxide preservation drawer. The second nitric oxide detector is located inside the nitric oxide preparation device and is used to detect the nitric oxide concentration inside the nitric oxide preparation device; A nitrogen dioxide detector is located inside the nitric oxide preservation drawer and is used to detect the nitrogen dioxide concentration inside the nitric oxide preservation drawer.

11. A refrigerator, characterized in that, Includes the food storage drawer as described in any one of claims 1 to 10.

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