Fresh-keeping drawer, control method thereof and refrigerator

Abstract

The invention discloses a fresh-keeping drawer, a control method of the 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 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] The present invention relates to the technical field of refrigerators, and in particular, to a fresh-keeping drawer, a control method thereof, and a refrigerator. Background Art

[0002] With the continuous improvement of living standards and the improvement of diet structures, people have higher and higher requirements for the freshness of food and the durability of food preservation. Refrigerators are the terminals for consumers to store food, and people's demand for the fresh-keeping function of refrigerators is increasing day by day.

[0003] NO gas has the effect of preserving fruits and vegetables. Treating fruits and vegetables with NO gas at a certain concentration has the effects of removing ethylene, inhibiting the ripening of fruits and vegetables, and extending the preservation period.

[0004] In the prior art, nitric oxide generating devices for preserving fruits and vegetables have the following problems in actual application: directly ionizing air to generate NO has low efficiency; NO is easily oxidized to NO2 in the air, affecting the use effect; during the preparation and preservation of NO, polluting gases NO and NO2 are generated, which are likely to cause damage to the environment and the human body.

[0005] In view of the problem of low preparation efficiency of NO gas for preservation in the related art, no effective solution has been proposed yet. Summary of the Invention

[0006] The present invention provides a fresh-keeping drawer, a control method thereof, and a refrigerator to at least solve the problem of low preparation efficiency of NO gas for preservation in the prior art.

[0007] To solve the above technical problems, according to one aspect of an embodiment of the present invention, a fresh-keeping drawer is provided, including: a controlled atmosphere drawer, in which a nitrogen-oxygen separation component is arranged for separating oxygen from the controlled atmosphere drawer; a nitric oxide preparation device, the intake end of which is connected to the controlled atmosphere drawer for preparing nitric oxide by using nitrogen in the controlled atmosphere drawer; and a nitric oxide fresh-keeping drawer, connected to the outlet end of the nitric oxide preparation device for preserving food by using the nitric oxide prepared by the nitric oxide preparation device.

[0008] Further, the nitrogen-oxygen separation component includes: a nitrogen-oxygen separation membrane group, an intake pipe, and an exhaust pipe; wherein, the intake pipe includes a first intake branch and a second intake branch, the first intake branch is communicated with the air outside the air-conditioning drawer and is used for separating nitrogen and oxygen by using the air outside the air-conditioning drawer, the second intake branch is communicated with the internal environment of the air-conditioning drawer and is used for separating nitrogen and oxygen by using the gas inside the air-conditioning drawer to increase the nitrogen concentration inside the air-conditioning drawer; the exhaust pipe includes a first exhaust branch and a second exhaust branch, the first exhaust branch is communicated with the air outside the air-conditioning drawer and is used for discharging the separated oxygen out of the air-conditioning drawer, and the second exhaust branch is communicated with the internal environment of the nitric oxide fresh-keeping drawer and is used for introducing the separated oxygen into the nitric oxide fresh-keeping drawer to oxidize nitric oxide when the nitric oxide inside the nitric oxide fresh-keeping drawer needs to be oxidized.

[0009] Further, it further includes: a first control valve, the first intake branch and the second intake branch are connected to the nitrogen-oxygen separation membrane group through the first control valve, and the first control valve is used for controlling the intake through the first intake branch or the second intake branch; a second control valve, the nitrogen-oxygen separation membrane group is connected to the first exhaust branch and the second exhaust branch through the second control valve, and the second control valve is used for controlling the exhaust through the first intake branch or the second intake branch.

[0010] Further, it further includes: a first air pump, which is located on the pipeline between the second control valve and the nitrogen-oxygen separation membrane group and is used for accelerating the separation of nitrogen and oxygen by the nitrogen-oxygen separation membrane group.

[0011] Further, the nitric oxide preparation device includes: a nitric oxide preparation chamber, which prepares nitric oxide by using an ion generator, wherein, the nitric oxide preparation chamber includes an intake end and an outlet end, the intake end is connected to the air-conditioning drawer, and the outlet end is connected to the nitric oxide fresh-keeping drawer and is used for preparing nitric oxide by using the nitrogen inside the air-conditioning drawer and introducing it into the nitric oxide fresh-keeping drawer.

[0012] Further, the intake end of the nitric oxide preparation chamber is also communicated with the air outside the air-conditioning drawer and is used for preparing nitric oxide by using the air outside the air-conditioning drawer; the fresh-keeping drawer further includes: a third control valve, and the intake end of the nitric oxide preparation chamber is communicated with the air-conditioning drawer or the air outside the air-conditioning drawer through the third control valve.

[0013] Further, it further 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, for drying the gas entering the nitric oxide preparation chamber; a third air pump, located on the pipeline between the nitric oxide preparation chamber and the nitric oxide fresh-keeping drawer.

[0014] Further, it further includes: a humidifying water box, located outside the nitric oxide fresh-keeping drawer, and communicated with the nitric oxide fresh-keeping drawer through a humidifying port; an atomizing device, located in the humidifying water box, for atomizing and humidifying the nitric oxide fresh-keeping drawer, and absorbing the nitrogen dioxide produced by the oxidation of nitric oxide in the nitric oxide fresh-keeping drawer.

[0015] Further, it further includes: a fourth air pump, located in the nitric oxide fresh-keeping drawer, with one end communicated with the internal environment of the nitric oxide fresh-keeping drawer and the other end communicated with the external environment of the nitric oxide fresh-keeping drawer, for discharging the atomized air after atomizing and humidifying, or evacuating the nitric oxide fresh-keeping drawer before introducing nitric oxide into the nitric oxide fresh-keeping drawer.

[0016] Further, it further includes: a nitrogen detector, located in the controlled-atmosphere drawer, for detecting the nitrogen concentration in the controlled-atmosphere drawer; a first image acquisition device, located in the controlled-atmosphere drawer, for acquiring an image of the fresh-keeping items in the controlled-atmosphere drawer; a second image acquisition device, located in the nitric oxide fresh-keeping drawer, for detecting an image of the fresh-keeping items in the nitric oxide fresh-keeping drawer; a first nitric oxide detector, located in the nitric oxide fresh-keeping drawer, for detecting the nitric oxide concentration in the nitric oxide fresh-keeping drawer; a second nitric oxide detector, located in the nitric oxide preparation device, for detecting the nitric oxide concentration in the nitric oxide preparation device; a nitrogen dioxide detector, located in the nitric oxide fresh-keeping drawer, for detecting the nitrogen dioxide concentration in the nitric oxide fresh-keeping drawer.

[0017] According to another aspect of the embodiments of the present invention, there is provided a method for controlling a fresh-keeping drawer, which is applied to the fresh-keeping drawer as described above. The method includes: after placing fresh-keeping items in the nitric oxide fresh-keeping drawer, acquiring an image of the fresh-keeping items; determining the required dose of nitric oxide according to the image of the fresh-keeping items; and controlling the operation of the nitric oxide preparation device and the nitrogen-oxygen separation component according to the required dose of nitric oxide.

[0018] Further, determining the required dosage of nitric oxide based on the image of the fresh-keeping item includes: determining the type and maturity of the fresh-keeping item according to the image of the fresh-keeping item; determining the required dosage of nitric oxide according to the type and maturity of the fresh-keeping item; wherein, a corresponding relationship table between the required dosage of nitric oxide and the type and maturity of the fresh-keeping item is preset.

[0019] Further, controlling the operation of the nitric oxide preparation device and the nitrogen-oxygen separation component according to the required dosage of nitric oxide includes: obtaining the nitrogen concentration in the controlled atmosphere drawer, and judging whether the nitrogen concentration is greater than or equal to a preset minimum concentration threshold; if so, determining the operating voltage of the ion generator according to the nitrogen concentration; wherein, the higher the nitrogen concentration, the lower the operating voltage of the ion generator; otherwise, controlling the nitrogen-oxygen separation component to be turned on to increase the nitrogen concentration in the controlled atmosphere drawer, and then determining the operating voltage of the ion generator according to the nitrogen concentration.

[0020] Further, after determining the operating voltage of the ion generator according to the nitrogen concentration, it further includes: detecting the nitric oxide concentration in the nitric oxide preparation device; obtaining the upper limit value of the nitric oxide required concentration of the fresh-keeping item and the volume of the nitric oxide fresh-keeping drawer; calculating the gas volume to be extracted from the nitric oxide preparation device according to the nitric oxide concentration, the upper limit value of the nitric oxide required concentration and the volume of the nitric oxide fresh-keeping drawer; controlling the fourth air pump to extract air from the nitric oxide preparation device according to the gas volume.

[0021] Further, the gas volume B = A - (W * V) / Vmax, where A is the volume of the nitric oxide fresh-keeping drawer, W is the volume of the nitric oxide preparation device, V is the nitric oxide concentration, and Vmax is the upper limit value of the nitric oxide required concentration of the fresh-keeping item.

[0022] Further, after controlling the fourth air pump to evacuate the nitric oxide preparation device according to the gas volume, the following steps are further included: introducing the nitric oxide in the nitric oxide preparation device into the nitric oxide fresh-keeping drawer; checking the real-time nitric oxide concentration in the nitric oxide fresh-keeping drawer, and calculating the real-time nitric oxide dose in the nitric oxide fresh-keeping drawer; determining whether the real-time nitric oxide concentration and the real-time nitric oxide dose meet the preset conditions; if so, controlling the nitric oxide preparation device to continue preparing nitric oxide and introducing the prepared nitric oxide into the nitric oxide fresh-keeping drawer until the real-time nitric oxide concentration reaches the upper limit value of the nitric oxide required concentration, and stopping introducing nitric oxide into the nitric oxide fresh-keeping drawer, and stopping preparing nitric oxide when the real-time nitric oxide dose reaches the preset dose; otherwise, controlling the nitric oxide fresh-keeping drawer to maintain the current state unchanged.

[0023] Further, after controlling the operation of the nitric oxide preparation device and the nitrogen-oxygen separation component according to the required dose of nitric oxide, the following steps are further included: detecting whether the nitric oxide in the nitric oxide fresh-keeping drawer needs to be oxidized; when the nitric oxide in the nitric oxide fresh-keeping drawer needs to be oxidized, detecting the nitrogen concentration in the controlled atmosphere drawer; controlling the nitrogen-oxygen separation component to separate oxygen according to the nitrogen concentration; oxidizing the nitric oxide in the nitric oxide fresh-keeping drawer with the oxygen separated by the nitrogen-oxygen separation component; controlling the atomizing device to atomize and humidify the nitric oxide fresh-keeping drawer, absorbing the nitrogen dioxide produced by the oxidation of the nitric oxide in the nitric oxide fresh-keeping drawer, and discharging the atomized air through the fourth air pump.

[0024] Further, controlling the nitrogen-oxygen separation component to separate oxygen according to the nitrogen concentration includes: determining whether the nitrogen concentration is greater than or equal to the preset concentration; if so, using the air outside the controlled atmosphere drawer for nitrogen-oxygen separation; otherwise, using the gas in the controlled atmosphere drawer for nitrogen-oxygen separation.

[0025] According to another aspect of the embodiments of the present invention, a refrigerator is provided, including the fresh-keeping drawer as described above.

[0026] According to another aspect of the embodiments of the present invention, a storage medium containing computer-executable instructions is provided, and the computer-executable instructions are used to execute the fresh-keeping drawer control method as described above when executed by a computer processor.

[0027] In the present invention, a fresh-keeping drawer is provided, which includes a controlled atmosphere drawer and a nitric oxide fresh-keeping drawer. A nitrogen-oxygen separation component is arranged in the controlled atmosphere drawer for separating oxygen from the controlled atmosphere drawer. The nitric oxide preparation device uses the high-concentration nitrogen gas in the controlled atmosphere drawer to prepare nitric oxide for the nitric oxide fresh-keeping drawer to carry out fresh-keeping. The fresh-keeping drawer in the present invention not only has a controlled atmosphere drawer, which can be used for reducing oxygen and carrying out controlled atmosphere fresh-keeping of climacteric fruits and vegetables, but also has a nitric oxide fresh-keeping drawer, which can be used for fresh-keeping of non-climacteric fruits and vegetables. Moreover, the high-concentration nitrogen gas prepared by the controlled atmosphere equipment, namely the nitrogen-oxygen separation membrane, is used as the raw material gas, solving the problems in the prior art that air is directly used in the process of preparing nitric oxide, with low efficiency and high concentration of impurity gases such as nitrogen dioxide, improving the preparation concentration and efficiency of nitric oxide. It not only has all-round functions, but also can improve the equipment utilization rate and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. is an alternative structural schematic diagram of a fresh-keeping drawer according to an embodiment of the present invention;

[0029] Figure 2 FIG. is another alternative structural schematic diagram of a fresh-keeping drawer according to an embodiment of the present invention;

[0030] Figure 3 FIG. is an alternative flowchart of a fresh-keeping drawer control method according to an embodiment of the present invention;

[0031] Figure 4 FIG. is another alternative flowchart of a fresh-keeping drawer control method according to an embodiment of the present invention;

[0032] Figure 5 FIG. is an alternative structural schematic diagram of a refrigerator according to an embodiment of the present invention.

[0033] DESCRIPTION OF THE REFERENCE NUMERALS:

[0034] 1, controlled atmosphere drawer; 2, nitric oxide fresh-keeping 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 intake branch; 10, second intake branch; 11, first control valve; 12, nitrogen-oxygen separation membrane group; 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 DESCRIPTION OF THE EMBODIMENTS

[0035] To make the objectives, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] The terms used in the embodiments of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. "Plural" generally includes at least two.

[0037] It should be understood that the term "and / or" used herein is only a description of the associated relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0038] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention to describe control valves, these control valves should not be limited to these terms. These terms are only used to distinguish the control valves connected to different devices. For example, without departing from the scope of the embodiments of the present invention, the first control valve may also be referred to as the second control valve, and similarly, the second control valve may also be referred to as the first control valve.

[0039] Depending on the context, the words "if", "when" as used herein may be interpreted as "when...", "when...", "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (stated condition or event)" may be interpreted as "when determined", "in response to determining", "when detecting (stated condition or event)", or "in response to detecting (stated condition or event)".

[0040] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such commodity or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or device including the said element.

[0041] The optional embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0042] Example 1

[0043] In the preferred Example 1 of the present invention, a fresh-keeping drawer is provided. Specifically, Figure 1 An optional structural schematic diagram of the fresh-keeping drawer is shown, as Figure 1 shown, the fresh-keeping drawer includes an air-adjusting drawer 1 and a nitric oxide fresh-keeping drawer 2.

[0044] Air-adjusting drawer 1: It is mainly used for storing climacteric fruits and vegetables (such as apples, pears, peaches, kiwifruits, etc.). After these fruits and vegetables mature, the intensity of their respiration increases significantly. Therefore, by reducing oxygen and increasing nitrogen, the respiration of fruits and vegetables can be effectively inhibited, thereby inhibiting the senescence of fruits and vegetables and prolonging the fresh-keeping period of fruits and vegetables.

[0045] The function of the air-adjusting drawer 1 is mainly realized by a vacuum pump and a nitrogen-oxygen separation membrane. The gas in the drawer is pumped out by the vacuum pump and passes through the nitrogen-oxygen separation membrane. The nitrogen-oxygen separation membrane has different dissolution rates and passing rates for oxygen and nitrogen. Under the push of the vacuum pump pressure, oxygen can pass through the membrane, while nitrogen cannot pass through. Therefore, the oxygen in the low-oxygen air-adjusting drawer 1 can be pumped out, leaving nitrogen. A gas component with high nitrogen and low oxygen is formed in the low-oxygen air-adjusting drawer 1, and the gas component pumped out through the nitrogen-oxygen separation membrane and the vacuum pump is high-concentration oxygen.

[0046] According to the types of fruits and vegetables, the gas components stored in the low-oxygen air-adjusting drawer 1 are adjusted to improve the fresh-keeping effect. It can be mainly divided into three categories, as shown in Table 1 below:

[0047] Table 1

[0048]

[0049] Nitric oxide fresh-keeping drawer 2: It is mainly used for storing non-climacteric fruits and vegetables (such as oranges, cherries, tomatoes, carrots, etc.). After these fruits and vegetables mature, their respiration slowly increases. Therefore, regulating the oxygen content in the storage environment has no obvious inhibitory effect on their ripening and senescence. Ethylene is a ripening gas produced during the ripening process of fruits and vegetables. By inhibiting the generation of ethylene, the senescence of fruits and vegetables can be delayed, and NO can inhibit the action of ethylene.

[0050] Fruits and vegetables of different types and different maturities need to be treated with different doses of NO, and at the same time, the maximum NO concentration they can tolerate is also different. The NO doses M and the maximum tolerated NO concentrations Vmax required for fruits and vegetables of different types and different maturities are as shown in Table 2 below:

[0051] Table 2

[0052]

[0053] Figure 2Another alternative structural schematic diagram of the fresh-keeping drawer is shown, as Figure 2 shown. The fresh-keeping drawer includes:

[0054] A modified atmosphere drawer 1, in which a nitrogen-oxygen separation component is arranged for separating oxygen from the modified atmosphere drawer 1;

[0055] A nitric oxide preparation device, the intake end of which is connected to the modified atmosphere drawer 1 for preparing nitric oxide by using the nitrogen in the modified atmosphere drawer 1. In addition to being connected to the modified atmosphere drawer 1 to prepare nitric oxide by using the nitrogen in the modified atmosphere drawer 1, the intake 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 devices, to prepare nitric oxide by using nitrogen. In the present invention, the intake end of the nitric oxide preparation device is directly connected to the modified atmosphere drawer 1, which solves the problem of the nitrogen source, not only saves costs, but also makes the structure more concise and compact;

[0056] A nitric oxide fresh-keeping drawer 2, which is connected to the outlet end of the nitric oxide preparation device for fresh-keeping by using the nitric oxide prepared by the nitric oxide preparation device.

[0057] In the above embodiment, a fresh-keeping drawer is provided, which includes a modified atmosphere drawer and a nitric oxide fresh-keeping drawer. A nitrogen-oxygen separation component is arranged in the modified atmosphere drawer for separating oxygen from the modified atmosphere drawer. The nitric oxide preparation device uses the high-concentration nitrogen in the modified atmosphere drawer to prepare nitric oxide for the nitric oxide fresh-keeping drawer to carry out fresh-keeping. The fresh-keeping drawer in the present invention not only has a modified atmosphere drawer, which can be used for the modified atmosphere fresh-keeping of climacteric fruits and vegetables by reducing oxygen, but also has a nitric oxide fresh-keeping drawer, which can be used for the fresh-keeping of non-climacteric fruits and vegetables. And by using the high-concentration nitrogen gas prepared by the modified atmosphere equipment, i.e., the nitrogen-oxygen separation membrane, as the raw material gas, the problems in the prior art of directly using air to prepare nitric oxide, such as low efficiency and high concentration of impurity gases such as nitrogen dioxide, are solved, the preparation concentration and efficiency of nitric oxide are improved, not only the functions are complete, but also the equipment utilization rate can be increased and energy can be saved.

[0058] In a preferred embodiment of the present invention, the nitrogen-oxygen separation assembly includes: a nitrogen-oxygen separation membrane group 12, an intake pipe, and an exhaust pipe; wherein, the intake pipe includes a first intake branch 9 and a second intake branch 10. The first intake branch 9 is in communication with the air outside the air-adjusting drawer 1 and is used for separating nitrogen and oxygen using the air outside the air-adjusting drawer 1. The second intake branch 10 is in communication with the internal environment of the air-adjusting drawer 1 and is used for separating nitrogen and oxygen using the gas inside the air-adjusting drawer 1 to increase the nitrogen concentration inside the air-adjusting drawer 1. The exhaust pipe includes a first exhaust branch 14 and a second exhaust branch 15. The first exhaust branch 14 is in communication with the air outside the air-adjusting drawer 1 and is used for discharging the separated oxygen out of the air-adjusting drawer 1. The second exhaust branch 15 is in communication with the internal environment of the nitric oxide preservation drawer 2 and is used for introducing the separated oxygen into the nitric oxide preservation drawer 2 to oxidize nitric oxide when the nitric oxide inside the nitric oxide preservation drawer 2 needs to be oxidized.

[0059] The air-adjusting drawer in the present invention can choose to extract air or the gas in the low-oxygen air-adjusting drawer through the nitrogen-oxygen separation membrane. On the one hand, it can perform nitrogen-oxygen separation on the internal environment of the air-adjusting drawer again to increase the nitrogen concentration inside the air-adjusting drawer. On the other hand, it can separate high-concentration nitrogen and oxygen from outdoor air when nitrogen or oxygen is needed. When high-concentration oxygen is needed to oxidize NO in the NO preservation drawer, the high-concentration oxygen generated through 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 through the nitrogen-oxygen separation membrane is discharged to the external environment of the preservation drawer through the first exhaust branch 14. The nitrogen-oxygen separation membrane mainly has two functions: one is to extract the gas inside or outside the low-oxygen air-adjusting drawer and adjust the N2 range of the low-oxygen air-adjusting drawer to maintain it at an appropriate concentration; the other is to extract the gas inside or outside the low-oxygen air-adjusting drawer and separate high-concentration oxygen for oxidizing NO in the NO preservation drawer. The nitrogen separated by the air-adjusting drawer in the present invention can be used to produce NO, and the separated oxygen can also be used to oxidize NO. For example, oxidize NO before the user opens the nitric oxide preservation drawer to avoid the pollution of NO to the air and the damage to the human body, fully utilize the function of the nitrogen-oxygen separation membrane group 12, improve the equipment utilization rate, and save the cost of the nitric oxide preservation drawer.

[0060] To achieve the control of different gas sources, the present invention further includes: a first control valve 11, the first intake branch 9 and the second intake branch 10 are connected to the nitrogen-oxygen separation membrane module 12 through the first control valve 11, and the first control valve 11 is used to control the intake through the first intake branch 9 or the second intake branch 10; a second control valve 17, the nitrogen-oxygen separation membrane module 12 is connected to the first exhaust branch 14 and the second exhaust branch 15 through the second control valve 17, and the first control valve 11 is used to control the intake through the first intake branch 9 or the second intake branch 10. The first control valve 11 is used to control the on-off of the intake pipeline, and it can select to extract air or the gas in the low-oxygen modified atmosphere drawer 1. The second control valve 17 is used to control the on-off of the exhaust pipeline, and it can select the exhaust mode.

[0061] In the above embodiment, the nitrogen-oxygen separation membrane of the modified atmosphere equipment is used to separate high-concentration N2 gas and high-concentration O2 gas. The high-concentration N2 gas can be used for the hypoxic modified atmosphere preservation of climacteric fruits and vegetables, 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 can increase the concentration of NO, delay the oxidation of NO, improve the treatment efficiency of NO on fruits and vegetables, inhibit the production of ethylene, and thus achieve the effect of preventing fruit and vegetable senescence and extending the preservation period. The high-concentration O2 gas can be used for NO oxidation and pollution treatment, achieving the effects of multi-purpose use of equipment, improving efficiency, and saving energy.

[0062] As Figure 2 shown, the preservation drawer further includes: a first air pump 13, which is located on the pipeline between the second control valve 17 and the nitrogen-oxygen separation membrane module 12, and is used to accelerate the separation of nitrogen and oxygen by the nitrogen-oxygen separation membrane module 12. The air pump can be a vacuum pump, which pumps the gas out through the vacuum pump and passes it through the nitrogen-oxygen separation membrane. The nitrogen-oxygen separation membrane has different dissolution rates and passing rates for oxygen and nitrogen. Under the push of the vacuum pump pressure, oxygen can pass through the membrane, while nitrogen cannot pass through. Therefore, high-concentration oxygen can be separated and discharged through the vacuum pump pipeline.

[0063] In another preferred embodiment of the present invention, the nitric oxide preparation device includes: a nitric oxide preparation chamber 21, which uses an ion generator to prepare nitric oxide. Among them, the nitric oxide preparation chamber 21 includes an intake end and an outlet end. The intake end is connected to the modified atmosphere drawer 1, and the outlet end is connected to the nitric oxide preservation drawer 2, and is used to prepare nitric oxide from the nitrogen in the modified atmosphere drawer 1 and introduce it into the nitric oxide preservation drawer 2. The preparation of NO is mainly through a plasma generator, including a pair of discharge electrodes and a high-voltage output circuit. Using the nitrogen in the modified atmosphere drawer 1 to prepare high-concentration nitric oxide and introducing it into the nitric oxide preservation drawer 2 can increase the concentration of NO, delay the oxidation of NO, improve the treatment efficiency of NO on fruits and vegetables, inhibit the production of ethylene, and thus achieve the effect of preventing fruit and vegetable senescence and extending the preservation period.

[0064] Preferably, the intake end of the nitric oxide preparation chamber 21 is also communicated with the air outside the air-conditioning drawer 1 for preparing nitric oxide by using the air outside the air-conditioning drawer 1; the fresh-keeping drawer further includes: a third control valve 18, and the intake end of the nitric oxide preparation chamber 21 is communicated with the air in the air-conditioning drawer 1 or the air outside the air-conditioning drawer 1 through the third control valve 18. The nitric oxide preparation chamber 21 can select to extract air or the gas in the low-oxygen air-conditioning drawer 1 to prepare nitric oxide, providing a variety of nitrogen sources for nitric oxide preparation.

[0065] In addition, it further includes: a second air 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 air pump 19 and the nitric oxide preparation chamber 21 for drying the gas entering the nitric oxide preparation chamber 21; a third air pump 23, located on the pipeline between the nitric oxide preparation chamber 21 and the nitric oxide fresh-keeping drawer 2. The dryer 20 is used for drying the gas. The second air pump 19 is used to extract gas into the nitric oxide preparation chamber 21. The second air pump 19 can adopt a vacuum pump. Since the gas extracted from the nitric oxide fresh-keeping drawer 2 is a high-humidity gas and will condense at a certain vacuum degree, therefore, a dryer 20 needs to be arranged behind the second air pump to remove moisture and ensure the nitrogen concentration and the preparation effect of nitric oxide. The third air pump 23 is used to extract the prepared NO into the NO fresh-keeping drawer. Through the pressure supply of the air pump, the flow of the gas in the pipeline can be accelerated, improving the preparation efficiency.

[0066] As Figure 1 shown, the fresh-keeping drawer in the present invention further includes: a humidifying water box 8, located outside the nitric oxide fresh-keeping drawer 2 and communicated with the nitric oxide fresh-keeping drawer 2 through a humidifying port 7; an atomizing device, located in the humidifying water box 8 for atomizing and humidifying the nitric oxide fresh-keeping drawer 2 to absorb the nitrogen dioxide produced by the oxidation of nitric oxide in the nitric oxide fresh-keeping drawer 2. The humidifying water box 8 is used to prepare atomized high-humidity air, mainly by ultrasonic humidification. The atomized air is used to absorb NO2 and discharge it from the drawer to prevent pollution. The reaction process is as follows:

[0067] 2NO + O2 = 2NO2

[0068] 2NO2 + H2O = HNO3 + HNO2

[0069] The atomized air after the reaction needs to be discharged. Therefore, the fresh-keeping drawer of the present invention further includes: a fourth air pump 16, located inside the nitric oxide fresh-keeping drawer 2, with one end communicating with the internal environment of the nitric oxide fresh-keeping drawer 2 and the other end communicating with the external environment of the nitric oxide fresh-keeping drawer 2, for discharging the atomized air after atomization and humidification, or evacuating the nitric oxide fresh-keeping drawer 2 before introducing nitric oxide into the nitric oxide fresh-keeping drawer 2. The fourth air pump 16 has two functions. The first is to ventilate the NO fresh-keeping drawer. After NO preservation, atomized air is needed to absorb NO2, and then the atomized air needs to be discharged into the air. The second is to use a vacuum pump to evacuate the air in advance during the NO preservation process to reduce NO oxidation and increase the NO concentration at the same time.

[0070] In addition, to implement the controlled atmosphere process in the controlled atmosphere drawer 1 and the nitric oxide preparation and fresh-keeping control process of the nitric oxide drawer, it 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 and located inside the controlled atmosphere drawer 1, for acquiring images of the fresh-keeping items inside the controlled atmosphere drawer 1; a second image acquisition device 4, located inside the nitric oxide fresh-keeping drawer 2, for detecting images of the fresh-keeping items inside the nitric oxide fresh-keeping drawer 2; a first nitric oxide detector 5, located inside the nitric oxide fresh-keeping drawer 2, for detecting the nitric oxide concentration inside the nitric oxide fresh-keeping 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; a nitrogen dioxide detector 6, located inside the nitric oxide fresh-keeping drawer 2, for detecting the nitrogen dioxide concentration inside the nitric oxide fresh-keeping drawer 2.

[0071] In the above embodiment, high-concentration N2 is used to prepare NO, which can increase the NO concentration, delay NO oxidation, improve the treatment efficiency of NO on fruits and vegetables, inhibit ethylene production, and thus achieve the effect of preventing fruit and vegetable senescence and extending the fresh-keeping period. At the same time, a controlled atmosphere equipment nitrogen-oxygen separation membrane is used to prepare high-N2 gas and high-O2 gas. The high-N2 gas can be used for reducing oxygen controlled atmosphere fresh-keeping of climacteric fruits and vegetables, and can also be used to prepare NO gas for non-climacteric fruits and vegetables fresh-keeping. The high-O2 gas can be used for NO oxidation and pollution treatment, achieving the effects of multi-purpose equipment, high efficiency, and energy conservation.

[0072] Embodiment 2

[0073] In the preferred Embodiment 2 of the present invention, a fresh-keeping drawer control method is provided, which is applied to the fresh-keeping drawer in the above Embodiment 1. Specifically, Figure 3 An optional flowchart showing this method is as Figure 3 shown. This method includes the following steps S302 - S306:

[0074] S302: After placing the fresh-keeping item in the nitric oxide fresh-keeping drawer, obtain an image of the fresh-keeping item;

[0075] S304: Determine the required dosage of nitric oxide according to the image of the fresh-keeping item;

[0076] S306: Control the operation of the nitric oxide preparation device and the nitrogen-oxygen separation component according to the required dosage of nitric oxide.

[0077] In the above embodiment, a fresh-keeping drawer is provided, which includes a controlled atmosphere drawer and a nitric oxide fresh-keeping drawer. A nitrogen-oxygen separation component is arranged in the controlled atmosphere drawer to separate oxygen from the controlled atmosphere drawer. The nitric oxide preparation device uses high-concentration nitrogen gas in the controlled atmosphere drawer to prepare nitric oxide for the nitric oxide fresh-keeping drawer to carry out fresh-keeping. The fresh-keeping drawer in the present invention not only has a controlled atmosphere drawer, which can be used for controlled atmosphere fresh-keeping of climacteric fruits and vegetables by reducing oxygen, but also has a nitric oxide fresh-keeping drawer, which can be used for fresh-keeping of non-climacteric fruits and vegetables. And by using the high-concentration nitrogen gas prepared by the controlled atmosphere equipment, i.e., the nitrogen-oxygen separation membrane, as the raw material gas, the problems in the prior art of directly using air to prepare nitric oxide, such as low efficiency and high concentration of impurity gases such as nitrogen dioxide, are solved, the preparation concentration and efficiency of nitric oxide are improved, not only the functions are complete, but also the equipment utilization rate can be increased and energy can be saved.

[0078] In a preferred embodiment of the present invention, determining the required dosage of nitric oxide according to the image of the fresh-keeping item includes: determining the type and maturity of the fresh-keeping item according to the image of the fresh-keeping item; determining the required dosage of nitric oxide according to the type and maturity of the fresh-keeping item; wherein, a corresponding relationship table between the required dosage of nitric oxide and the type and maturity of the fresh-keeping item is preset, as shown in Table 2. The type and maturity of the fruits and vegetables placed are identified by image recognition, and the maximum limit value Vmax of the NO concentration and the required dosage M corresponding to the type and maturity of the fresh-keeping item are determined through Table 2, and then the operation of the nitric oxide preparation device and the nitrogen-oxygen separation component is controlled according to the required dosage to accurately control the fresh-keeping process.

[0079] After determining the required dose of nitric oxide, control the operation of the nitric oxide preparation device and the nitrogen-oxygen separation component according to the required dose of nitric oxide, including: obtaining the nitrogen concentration in the controlled atmosphere drawer, and determining whether the nitrogen concentration is greater than or equal to a preset minimum concentration threshold; if so, determining the operating voltage of the ion generator according to the nitrogen concentration; wherein, the higher the nitrogen concentration, the lower the operating voltage of the ion generator; otherwise, control the nitrogen-oxygen separation component to start to increase the nitrogen concentration in the controlled atmosphere drawer, and then determine the operating voltage of the ion generator according to the nitrogen concentration. The nitrogen detector detects the nitrogen concentration in the controlled atmosphere drawer. Since the low-oxygen controlled atmosphere drawer itself needs to control different N2 concentrations according to the fruits and vegetables stored inside, when using different concentrations of N2 gas inside to prepare NO, it is necessary to adjust the appropriate voltage intensity according to the difference in N2 concentration in the raw material gas. For example:

[0080] 96% ≤ N2 ≤ 98%, draw out 10 L of the gas in the controlled atmosphere drawer, pass it through the dryer and enter the nitric oxide preparation chamber, the NO preparation voltage intensity is 1 - 2 kv, and the reaction time is 10 min;

[0081] 94% ≤ N2 < 96%, draw out 10 L of the gas in the controlled atmosphere drawer, pass it through the dryer and enter the nitric oxide preparation chamber, the NO preparation voltage intensity is 2.5 - 3.5 kv, and the reaction time is 10 min;

[0082] 86% ≤ N2 < 94%, draw out 10 L of the gas in the controlled atmosphere drawer, pass it through the dryer and enter the nitric oxide preparation chamber, the NO preparation voltage intensity is 4.0 - 5.0 kv, and the reaction time is 10 min;

[0083] 79% ≤ N2 < 86% indicates that the N2 concentration in the gas in the controlled atmosphere drawer is low and deviates from the optimal range. It is necessary to first extract the gas in the controlled atmosphere drawer through the nitrogen-oxygen separation component, reduce the oxygen and increase the nitrogen to reach the preset range before proceeding with the subsequent NO preparation.

[0084] After determining the operating voltage of the ion generator according to the nitrogen concentration, it further includes: detecting the nitric oxide concentration in the nitric oxide preparation device; obtaining the upper limit value of the nitric oxide demand concentration of the fresh-keeping item and the volume of the nitric oxide fresh-keeping drawer; calculating the volume of the gas drawn out of the nitric oxide preparation device according to the nitric oxide concentration, the upper limit value of the nitric oxide demand concentration, and the volume of the nitric oxide fresh-keeping drawer; controlling the fourth air pump to pump air from the nitric oxide preparation device according to the gas volume. Specifically, the gas volume B = A - (W * V) / Vmax, where A is the volume of the nitric oxide fresh-keeping drawer, W is the volume of the nitric oxide preparation chamber, V is the nitric oxide concentration, and Vmax is the upper limit value of the nitric oxide demand concentration of the fresh-keeping item.

[0085] The second nitric oxide detector detects the NO concentration V in the nitric oxide preparation chamber. According to the Vmax of the stored fruits and vegetables and the NO concentration V in the nitric oxide preparation chamber, the volume of the nitric oxide fresh-keeping drawer is A liters. Calculate the volume of gas B liters to be pumped out from the nitric oxide fresh-keeping drawer, B = A - (W * V) / Vmax, and use a vacuum pump to pump out some air. The main purpose of this step is to calculate the air to be pumped out according to the concentration, volume of NO preparation, volume of the fresh-keeping chamber, and the preset maximum upper limit concentration of NO preservation, so that the NO content in the nitric oxide fresh-keeping drawer reaches the highest value as much as possible, reduce the reaction time, and at the same time pumping out some air can also slow down the oxidation of NO.

[0086] After controlling the fourth air pump to pump air into the nitric oxide preparation device according to the gas volume, it further includes: introducing the nitric oxide in the nitric oxide preparation device into the nitric oxide fresh-keeping drawer; checking the real-time nitric oxide concentration in the nitric oxide fresh-keeping drawer and calculating the real-time nitric oxide dose in the nitric oxide fresh-keeping drawer; judging whether the real-time nitric oxide concentration and the real-time nitric oxide dose meet the preset conditions; if so, controlling the nitric oxide preparation to continue preparing nitric oxide and introducing the prepared nitric oxide into the nitric oxide fresh-keeping drawer until the real-time nitric oxide concentration reaches the upper limit value of the nitric oxide demand concentration, stop introducing nitric oxide into the nitric oxide fresh-keeping drawer, and stop preparing nitric oxide when the real-time nitric oxide dose reaches the preset dose; otherwise, control the nitric oxide fresh-keeping drawer to maintain the current state unchanged.

[0087] The first nitric oxide detector detects the NO concentration in the nitric oxide fresh-keeping drawer. Record the maintenance time of the NO concentration, for example, the V1 concentration is maintained for T1 time, the V2 concentration is maintained for T2 time, the V3 concentration is maintained for T3 time..., and the difference between V1, V2, V3... is 1 ppm. Calculate the real-time nitric oxide dose, that is, M1 = V1 (concentration) * T1 (time) + V2 * T2 +... + Vn * Tn.

[0088] Since NO will slowly oxidize and degrade, its concentration decreases. If the concentration is too low, on the one hand, it cannot play a fresh-keeping role for fruits and vegetables, and on the other hand, it requires a longer action time, which may affect the user's use of the refrigerator. Therefore, it is preset that when the NO concentration L in the NO fresh-keeping drawer < 1 / 2V1, the plasma generator needs to be turned on to re-index NO for supplementation.

[0089] When L ≥ 1 / 2V1 and M1 ≥ M (NO fresh-keeping demand dose, obtained from Table 2), the NO oxidation absorption mode is started.

[0090] When L < 1 / 2V1 and M1 < M, continue to prepare NO. Draw out 10L of external air, pass it through a dryer and into the NO preparation chamber. The NO preparation voltage intensity is 5 - 6 kv, and the reaction time is 10 min. Then pass the NO gas into the NO fresh-keeping drawer. The NO sensor detects the NO concentration in the NO fresh-keeping drawer. When the NO concentration ≥ Vmax, stop the ventilation; until M1 reaches the preset dose, turn off the NO preparation.

[0091] Preferably, after controlling the operation of the NO preparation device and the nitrogen-oxygen separation component according to the required dose of NO, it further includes: detecting whether the NO in the NO fresh-keeping drawer needs to be oxidized; when the NO in the NO fresh-keeping drawer needs to be oxidized, detecting the nitrogen concentration in the controlled atmosphere drawer; controlling the nitrogen-oxygen separation component to separate oxygen according to the nitrogen concentration; oxidizing the NO in the NO fresh-keeping drawer with the oxygen separated by the nitrogen-oxygen separation component; controlling the atomizing device to atomize and humidify the NO fresh-keeping drawer, absorb the nitrogen dioxide produced by the oxidation of the NO in the NO fresh-keeping drawer, and discharge the atomized air through the fourth air pump. Before the NO fresh-keeping drawer starts to be used, the user is required to set the start time of the NO fresh-keeping function, and it is prompted that the drawer cannot be opened when the NO fresh-keeping function starts to process. The user is prompted to set the NO processing time at midnight or other times when the NO fresh-keeping drawer of the refrigerator will not be used. At the same time, the NO fresh-keeping drawer is provided with a locking device, and the NO fresh-keeping drawer cannot be opened before the program is completed, that is, before the NO gas is processed to a safe value, to ensure safety. And use the nitrogen-oxygen separation membrane of the controlled atmosphere equipment to separate high-O2 gas to quickly oxidize the NO gas after the fresh-keeping is completed to generate NO2, and absorb and discharge NO2 by using high-humidity air to solve the pollution of NO fresh-keeping to the air and the damage to the human body.

[0092] Specifically, controlling the nitrogen-oxygen separation component to separate oxygen according to the nitrogen concentration includes: judging whether the nitrogen concentration is greater than or equal to the preset concentration; if so, using the air outside the controlled atmosphere drawer for nitrogen-oxygen separation; otherwise, using the gas inside the controlled atmosphere drawer for nitrogen-oxygen separation. The nitrogen detector detects whether the nitrogen concentration in the controlled atmosphere drawer meets the preset concentration: (1) If N2 ≥ the preset concentration, draw out air and pass it through the nitrogen-oxygen separation membrane to prepare high-concentration O2 gas, and pass it into the NO fresh-keeping drawer. NO reacts with the high-concentration oxygen to generate NO2. When the NO concentration drops below 100 ppb, stop passing in the high-oxygen gas; (2) If N2 < the preset concentration, preferably draw out the gas in the low-profile drawer and pass it through the nitrogen-oxygen separation membrane. When N2 rises to reach the preset concentration, then oxidize the NO in the NO fresh-keeping drawer. The atomizing and humidifying device is turned on and circulates in the way of absorbing NO2 - exhausting - humidifying for 10 min until the NO2 concentration drops below 100 ppb to ensure user safety and reduce environmental pollution.

[0093] In a preferred Embodiment 2 of the present invention, another method for controlling the fresh-keeping drawer is further provided. Specifically, Figure 4 An optional flowchart showing this method is as Figure 4 shown. This method includes the following steps S401 - S424:

[0094] S401: Image recognition to determine the placement of fruits and vegetables;

[0095] S402: The user sets the start time for running the NO fresh-keeping mode; Image recognition to determine the placement of fruits and vegetables, and the user sets the start time for running the NO fresh-keeping mode. This step is mainly because NO fresh-keeping requires treating fruits and vegetables with NO every day, and the refrigerator drawer cannot be opened during use. To avoid affecting the user's use, it is recommended that the user set the start time for the NO fresh-keeping function during the time period when the user does not use the refrigerator, such as early in the morning;

[0096] S403: Image recognition to identify the types and maturity of the placed fruits and vegetables, and determine the NO fresh-keeping dose M, as shown in Table 2;

[0097] S404: The nitrogen detector detects the nitrogen concentration in the controlled atmosphere drawer;

[0098] S405: 96% ≤ N2 ≤ 98%;

[0099] S406: 10L of the gas in the controlled atmosphere drawer is extracted, passes through a dryer, and enters the nitric oxide preparation chamber. The NO preparation voltage intensity is 1 - 2 kV, and the reaction time is 10 min;

[0100] S407: 94% ≤ N2 < 96%;

[0101] S408: 10L of the gas in the controlled atmosphere drawer is extracted, passes through a dryer, and enters the nitric oxide preparation chamber. The NO preparation voltage intensity is 2.5 - 3.5 kV, and the reaction time is 10 min;

[0102] S409: 86% ≤ N2 < 94%;

[0103] S410: 10L of the gas in the controlled atmosphere drawer is extracted, passes through a dryer, and enters the nitric oxide preparation chamber. The NO preparation voltage intensity is 4.0 - 5.0 kV, and the reaction time is 10 min;

[0104] S411: 79% ≤ N2 < 86%;

[0105] S412: The oxygen reduction device is started, and then the process returns to step S404;

[0106] S413: Detect the NO concentration H in the nitric oxide preparation chamber;

[0107] S414: Based on the Vmax of the stored fruits and vegetables and the NO concentration in the nitric oxide preparation chamber, with the volume of the nitric oxide fresh-keeping drawer being A liters, calculate the gas in the nitric oxide fresh-keeping drawer to be pumped out, B = A - (W * V) / Vmax, and use a vacuum pump to pump out some air;

[0108] S415: Introduce NO gas into the nitric oxide fresh-keeping drawer;

[0109] S416: Detect the NO concentration in the nitric oxide fresh-keeping drawer;

[0110] S417: Record the maintenance time of the NO concentration. For example, the V1 concentration is maintained for T1 time, the V2 concentration is maintained for T2 time, the V3 concentration is maintained for T3 time... The difference between V1, V2, V3... is 1 ppm. Calculate the real-time nitric oxide dose M1 = V1 (concentration) * T1 (time) + V2 * T2 +... + Vn * Tn;

[0111] S418: When L ≥ 1 / 2V1 and M1 ≥ M, start the NO oxidation absorption mode, and then enter step S423;

[0112] S419: When L < 1 / 2V1 and M1 < M, continue to prepare NO;

[0113] S420: Pump out 10 L of external air, pass it through a dryer and enter the nitric oxide preparation chamber. The NO preparation voltage intensity is 5 - 6 kv, and the reaction time is 10 min;

[0114] S421: Introduce NO gas into the nitric oxide fresh-keeping drawer;

[0115] S422: The NO sensor detects the NO concentration in the nitric oxide fresh-keeping drawer. When the NO concentration ≥ Vmax, stop ventilation; until M reaches the preset dose, turn off NO preparation;

[0116] S423: The nitrogen detector detects whether the nitrogen concentration in the airtight storage drawer meets the preset concentration: (1) If N2 ≥ the preset concentration, pump out air and pass it through a nitrogen-oxygen separation membrane to prepare high-concentration O2 gas, and introduce it into the nitric oxide fresh-keeping drawer. NO reacts with high-concentration oxygen to form NO2. When the NO concentration drops below 100 ppb, stop introducing high-oxygen gas; (2) If N2 < the preset concentration, preferentially pump out the gas in the low-pressure drawer and pass it through a nitrogen-oxygen separation membrane;

[0117] S424: Turn on the atomizing humidification device and cycle in the way of absorbing NO2 - exhausting - humidifying for 10 min until the NO2 concentration drops below 100 ppb.

[0118] Example 3

[0119] Based on the fresh-keeping drawer provided in the above-mentioned Embodiment 1, in the preferred Embodiment 3 of the present invention, a refrigerator is further provided, including the fresh-keeping drawer as described above.

[0120] Figure 5 An optional structural schematic diagram of the refrigerator is shown, as Figure 5 shown, an oxygen adjustment drawer and a nitric oxide fresh-keeping drawer are provided on the refrigerator.

[0121] In the above-mentioned embodiment, a fresh-keeping drawer is provided, including an air-adjusting drawer and a nitric oxide fresh-keeping drawer. A nitrogen-oxygen separation component is arranged in the air-adjusting drawer for separating oxygen from the air-adjusting drawer. The nitric oxide preparation device uses the high-concentration nitrogen gas in the air-adjusting drawer to prepare nitric oxide for the nitric oxide fresh-keeping drawer to carry out fresh-keeping. The fresh-keeping drawer in the present invention not only has an air-adjusting drawer, which can be used for reducing oxygen and air-adjusting fresh-keeping of climacteric fruits and vegetables, but also has a nitric oxide fresh-keeping drawer, which can be used for fresh-keeping of non-climacteric fruits and vegetables. And by using the high-concentration nitrogen gas prepared by the air-adjusting device, i.e., the nitrogen-oxygen separation membrane, as the raw material gas, the problems in the prior art of directly using air to prepare nitric oxide, such as low efficiency and high concentration of impurity gases such as nitrogen dioxide, are solved, the preparation concentration and efficiency of nitric oxide are improved, not only the functions are complete, but also the equipment utilization rate can be increased and energy can be saved.

[0122] Embodiment 4

[0123] Based on the fresh-keeping drawer control method provided in the above-mentioned Embodiment 2, in the preferred Embodiment 4 of the present invention, a storage medium containing computer-executable instructions is further provided, and the computer-executable instructions are used to execute the fresh-keeping drawer control method as described above when executed by a computer processor.

[0124] In the above-mentioned embodiment, a fresh-keeping drawer is provided, including an air-adjusting drawer and a nitric oxide fresh-keeping drawer. A nitrogen-oxygen separation component is arranged in the air-adjusting drawer for separating oxygen from the air-adjusting drawer. The nitric oxide preparation device uses the high-concentration nitrogen gas in the air-adjusting drawer to prepare nitric oxide for the nitric oxide fresh-keeping drawer to carry out fresh-keeping. The fresh-keeping drawer in the present invention not only has an air-adjusting drawer, which can be used for reducing oxygen and air-adjusting fresh-keeping of climacteric fruits and vegetables, but also has a nitric oxide fresh-keeping drawer, which can be used for fresh-keeping of non-climacteric fruits and vegetables. And by using the high-concentration nitrogen gas prepared by the air-adjusting device, i.e., the nitrogen-oxygen separation membrane, as the raw material gas, the problems in the prior art of directly using air to prepare nitric oxide, such as low efficiency and high concentration of impurity gases such as nitrogen dioxide, are solved, the preparation concentration and efficiency of nitric oxide are improved, not only the functions are complete, but also the equipment utilization rate can be increased and energy can be saved.

[0125] The serial numbers of the above-mentioned embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments.

[0126] In the above embodiments of the present invention, the descriptions of the various embodiments each have their own focuses. For parts not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0127] In several embodiments provided by the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the units or modules can be in electrical or other forms.

[0128] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0129] In addition, in each embodiment of the present invention, the functional units can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0130] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this 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 for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), mobile hard disks, magnetic disks or optical discs that can store program codes.

[0131] Other embodiments of the present invention will be readily apparent 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 known or customary technical means in the art that are not invented by the present invention. The specification and examples are only to be considered exemplary, and the true scope and spirit of the invention are pointed out by the following claims.

[0132] It should be understood that the present invention is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A fresh-keeping drawer, characterized in that, Comprising: A controlled atmosphere drawer, in which a nitrogen-oxygen separation component is provided for separating oxygen from the inside of the controlled atmosphere drawer; A nitric oxide preparation device, the intake end of which is connected to the controlled atmosphere drawer for preparing nitric oxide using the nitrogen in the controlled atmosphere drawer; A nitric oxide preservation drawer, connected to the outlet end of the nitric oxide preparation device, for preserving using the nitric oxide prepared by the nitric oxide preparation device.

2. The fresh-keeping drawer according to claim 1, wherein The nitrogen-oxygen separation component includes: a nitrogen-oxygen separation membrane group, an intake pipe, and an exhaust pipe; wherein, the intake pipe includes a first intake branch and a second intake branch. The first intake branch is communicated with the air outside the controlled atmosphere drawer for performing nitrogen-oxygen separation using the air outside the controlled atmosphere drawer, and the second intake branch is communicated with the internal environment of the controlled atmosphere drawer for performing 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 is communicated with the air outside the controlled atmosphere drawer for discharging the separated oxygen from the controlled atmosphere drawer, and the second exhaust branch is communicated with the internal environment of the nitric oxide preservation drawer for introducing the separated oxygen into the nitric oxide preservation drawer to oxidize nitric oxide when the nitric oxide in the nitric oxide preservation drawer needs to be oxidized.

3. The fresh-keeping drawer according to claim 2, wherein Further comprising: A first control valve, the first intake branch and the second intake branch are connected to the nitrogen-oxygen separation membrane group through the first control valve, and the first control valve is used to control the intake through the first intake branch or the second intake branch; A second control valve, the nitrogen-oxygen separation membrane group is connected to the first exhaust branch and the second exhaust branch through the second control valve, and the second control valve is used to control the exhaust through the first intake branch or the second intake branch.

4. The fresh-keeping drawer according to claim 3, characterized in that, Further comprising: A first air pump, located on the pipeline between the second control valve and the nitrogen-oxygen separation membrane group, for accelerating the separation of nitrogen and oxygen by the nitrogen-oxygen separation membrane group.

5. The fresh-keeping drawer according to claim 1, characterized in that, The nitric oxide preparation device includes: A nitric oxide preparation chamber for preparing nitric oxide using an ion generator. The nitric oxide preparation chamber includes an intake end and an outlet end. The intake end is connected to the controlled atmosphere drawer, and the outlet end is connected to the nitric oxide preservation drawer for preparing nitric oxide using the nitrogen in the controlled atmosphere drawer and introducing it into the nitric oxide preservation drawer.

6. The fresh-keeping drawer according to claim 5, wherein The intake end of the nitric oxide preparation chamber is also communicated with the air outside the controlled atmosphere drawer for preparing nitric oxide using the air outside the controlled atmosphere drawer; The preservation drawer further includes: a third control valve, and the intake end of the nitric oxide preparation chamber is communicated with the controlled atmosphere drawer or the air outside the controlled atmosphere drawer through the third control valve.

7. The fresh-keeping drawer according to claim 6, characterized in that, Further comprising: 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, for drying 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 fresh-keeping drawer.

8. The fresh-keeping drawer according to claim 2, characterized in that, It further includes: A humidifying water box is located outside the nitric oxide fresh-keeping drawer and is communicated with the nitric oxide fresh-keeping drawer through a humidifying port; An atomizing device is located in the humidifying water box and is used for atomizing and humidifying the nitric oxide fresh-keeping drawer to absorb nitrogen dioxide produced by the oxidation of nitric oxide in the nitric oxide fresh-keeping drawer.

9. The fresh-keeping drawer according to claim 8, wherein, It further includes: The fourth air pump is located in the nitric oxide fresh-keeping drawer. One end is communicated with the internal environment of the nitric oxide fresh-keeping drawer, and the other end is communicated with the external environment of the nitric oxide fresh-keeping drawer. It is used for discharging the atomized air after atomizing and humidifying, or for evacuating the nitric oxide fresh-keeping drawer before introducing nitric oxide into the nitric oxide fresh-keeping drawer.

10. The fresh-keeping drawer according to claim 1, wherein It further includes: A nitrogen detector is located in the controlled atmosphere drawer and is used for detecting the nitrogen concentration in the controlled atmosphere drawer; The first image acquisition device is located in the controlled atmosphere drawer and is used for acquiring images of the fresh-keeping items in the controlled atmosphere drawer; The second image acquisition device is located in the nitric oxide fresh-keeping drawer and is used for detecting images of the fresh-keeping items in the nitric oxide fresh-keeping drawer; The first nitric oxide detector is located in the nitric oxide fresh-keeping drawer and is used for detecting the nitric oxide concentration in the nitric oxide fresh-keeping drawer; The second nitric oxide detector is located in the nitric oxide preparation device and is used for detecting the nitric oxide concentration in the nitric oxide preparation device; The nitrogen dioxide detector is located in the nitric oxide fresh-keeping drawer and is used for detecting the nitrogen dioxide concentration in the nitric oxide fresh-keeping drawer.

11. A method for controlling a fresh-keeping drawer, which is applied to the fresh-keeping drawer according to any one of claims 1 to 10, characterized in that, The method includes: After placing fresh-keeping items in the nitric oxide fresh-keeping drawer, acquiring images of the fresh-keeping items; Determining the required dosage of nitric oxide according to the images of the fresh-keeping items; Controlling the operation of the nitric oxide preparation device and the nitrogen-oxygen separation component according to the required dosage of nitric oxide.

12. The method according to claim 11, wherein Determining the required dosage of nitric oxide according to the images of the fresh-keeping items includes: Determining the type and maturity of the fresh-keeping items according to the images of the fresh-keeping items; Determining the required dosage of nitric oxide according to the type and maturity of the fresh-keeping items; wherein, there is a pre-set corresponding relationship table between the required dosage of nitric oxide and the type and maturity of the fresh-keeping items.

13. The method according to claim 11, wherein Controlling the operation of the nitric oxide preparation device and the nitrogen-oxygen separation component according to the required dosage of nitric oxide includes: Acquiring the nitrogen concentration in the controlled atmosphere drawer and judging whether the nitrogen concentration is greater than or equal to a pre-set minimum concentration threshold; If so, determining the operating voltage of the ion generator according to the nitrogen concentration; wherein, the higher the nitrogen concentration, the lower the operating voltage of the ion generator; Otherwise, controlling the nitrogen-oxygen separation component to start to increase the nitrogen concentration in the controlled atmosphere drawer, and then determining the operating voltage of the ion generator according to the nitrogen concentration.

14. The method according to claim 13, wherein After determining the operating voltage of the ion generator according to the nitrogen concentration, it further includes: Detecting the nitric oxide concentration in the nitric oxide preparation device; Obtain the upper limit value of the nitric oxide demand concentration of the fresh-keeping article and the volume of the nitric oxide fresh-keeping drawer; Calculate the gas volume extracted from the nitric oxide preparation device according to the nitric oxide concentration, the upper limit value of the nitric oxide demand concentration and the volume of the nitric oxide fresh-keeping drawer; Control the fourth air pump to extract air from the nitric oxide preparation device according to the gas volume.

15. The method according to claim 14, characterized in that, The gas volume B = A - (W * V) / Vmax, where A is the volume of the nitric oxide fresh-keeping drawer, W is the volume of the nitric oxide preparation device, V is the nitric oxide concentration, and Vmax is the upper limit value of the nitric oxide demand concentration of the fresh-keeping article.

16. The method according to claim 14, wherein After controlling the fourth air pump to extract air from the nitric oxide preparation device according to the gas volume, it further includes: Introduce the nitric oxide in the nitric oxide preparation device into the nitric oxide fresh-keeping drawer; Check the real-time nitric oxide concentration in the nitric oxide fresh-keeping drawer and calculate the real-time nitric oxide dose in the nitric oxide fresh-keeping drawer; Judge whether the real-time nitric oxide concentration and the real-time nitric oxide dose meet the preset conditions; If so, control the nitric oxide preparation to continue preparing nitric oxide and introduce the prepared nitric oxide into the nitric oxide fresh-keeping drawer until the real-time nitric oxide concentration reaches the upper limit value of the nitric oxide demand concentration, then stop introducing nitric oxide into the nitric oxide fresh-keeping drawer, and stop preparing nitric oxide when the real-time nitric oxide dose reaches the preset dose; Otherwise, control the nitric oxide fresh-keeping drawer to maintain the current state unchanged.

17. The method according to claim 11, wherein After controlling the operation of the nitric oxide preparation device and the nitrogen-oxygen separation component according to the demand dose of nitric oxide, it further includes: Detect whether the nitric oxide in the nitric oxide fresh-keeping drawer needs to be oxidized; When the nitric oxide in the nitric oxide fresh-keeping drawer needs to be oxidized, detect the nitrogen concentration in the controlled atmosphere drawer; Control the nitrogen-oxygen separation component to separate oxygen according to the nitrogen concentration; Use the oxygen separated by the nitrogen-oxygen separation component to oxidize the nitric oxide in the nitric oxide fresh-keeping drawer; Control the atomizing device to atomize and humidify the nitric oxide fresh-keeping drawer, absorb the nitrogen dioxide produced by the oxidation of the nitric oxide in the nitric oxide fresh-keeping drawer, and discharge the atomized air through the fourth air pump.

18. The method according to claim 17, wherein Controlling the nitrogen-oxygen separation component to separate oxygen according to the nitrogen concentration includes: Judge whether the nitrogen concentration is greater than or equal to the preset concentration; If so, perform nitrogen-oxygen separation using the air outside the controlled atmosphere drawer; Otherwise, perform nitrogen-oxygen separation using the gas inside the controlled atmosphere drawer.

19. A refrigerator, characterized in that, Including the fresh-keeping drawer according to any one of claims 1 to 10.

20. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions are used to execute the fresh-keeping drawer control method according to any one of claims 11 to 18 when executed by a computer processor.

Images