Refrigerator fresh-keeping drawer and control method and device for refrigerator fresh-keeping drawer

Abstract

The embodiment of the invention provides a refrigerator fresh-keeping drawer and a control method and device.The method comprises the steps that under the condition that a closed fresh-keeping space is formed by a cavity and a drawer, a vacuum pump is started, so that oxygen and carbon dioxide in the fresh-keeping space are discharged through a nitrogen-oxygen separation membrane assembly; the normal pressure intensity in the fresh-keeping space is ensured through the flexible elastic air bag; the oxygen concentration and the carbon dioxide concentration in the fresh-keeping space are determined; and controlling closing of a vacuum pump and opening and closing of a carbon dioxide gas valve according to the oxygen concentration and the carbon dioxide concentration so as to control the oxygen concentration and the carbon dioxide concentration to meet preset fresh-keeping requirements. According to the embodiment of the invention, the concentration of carbon dioxide is increased while the concentration of oxygen is reduced, so that the fresh-keeping effect on food is further improved. In addition, large negative pressure does not appear in the fresh-keeping space, and a special pressure-resistant structure and a high-performance vacuum pump are not needed, so that the product cost is reduced, and the product reliability is improved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigerator fresh-keeping, and in particular to a refrigerator fresh-keeping drawer, a control method and device for a refrigerator fresh-keeping drawer, an electronic device and a storage medium. Background Art

[0002] During food storage, reducing the oxygen concentration in the storage environment can inhibit the respiration of fruits and vegetables, reduce food oxidation and the reproduction of microorganisms, thereby extending the shelf life of food. Carbon dioxide is also an important gas used to protect food. It has a strong inhibitory effect on molds and enzymes, and is "toxic" to aerobic bacteria. Therefore, reducing the oxygen concentration and increasing the carbon dioxide concentration in the food storage environment is conducive to protecting food quality and extending the preservation of food. Although the respiration of plant foods such as fruits and vegetables can also achieve a decrease in oxygen concentration and an increase in carbon dioxide concentration, that is, spontaneous atmosphere preservation technology, this process requires a sufficient amount of fruits and vegetables and takes at least 1 to 2 days. This method is not suitable for non-fruit and vegetable foods, and household refrigerators are generally opened at least once a day to store and access items, resulting in changes in the gas environment, thereby losing the preservation effect. Summary of the invention

[0003] The embodiment of the present application provides a control method for a refrigerator fresh-keeping drawer to solve the problem that the existing spontaneous atmosphere-controlled fresh-keeping technology cannot guarantee the fresh-keeping effect.

[0004] Correspondingly, the embodiment of the present application also provides a control device for a refrigerator fresh-keeping drawer, an electronic device and a storage medium to ensure the implementation and application of the above method.

[0005] In order to solve the above problems, the embodiment of the present application discloses a refrigerator fresh-keeping drawer, which comprises: a cavity, a drawer, a nitrogen-oxygen separation membrane assembly, a vacuum pump, a carbon dioxide separation membrane assembly and a flexible elastic airbag; the cavity comprises a carbon dioxide gas valve, the drawer is located inside the cavity, the nitrogen-oxygen separation membrane assembly, the carbon dioxide separation membrane assembly and the flexible elastic airbag are located on the cavity, and the vacuum pump is connected to the cavity;

[0006] The drawer and the cavity form a closed fresh-keeping space;

[0007] The nitrogen and oxygen separation membrane assembly is used to pass oxygen and carbon dioxide in the fresh-keeping space;

[0008] The vacuum pump is used to extract air from the fresh-keeping space;

[0009] The carbon dioxide separation membrane assembly is used to pass carbon dioxide outside the cavity;

[0010] The flexible elastic airbag is used to ensure the pressure in the fresh-keeping space;

[0011] The carbon dioxide gas valve is used to allow air outside the cavity to enter the fresh-keeping space.

[0012] The embodiment of the present application discloses a control method for a refrigerator fresh-keeping drawer, wherein the refrigerator fresh-keeping drawer comprises: a cavity, a drawer, a nitrogen-oxygen separation membrane assembly, a vacuum pump and a flexible elastic airbag; the cavity comprises a carbon dioxide gas valve, the drawer is located inside the cavity, the nitrogen-oxygen separation membrane assembly and the flexible elastic airbag are located on the cavity, the vacuum pump is connected to the cavity, and the method comprises:

[0013] When the cavity and the drawer form a closed fresh-keeping space, the vacuum pump is turned on to discharge the oxygen and carbon dioxide in the fresh-keeping space through the nitrogen-oxygen separation membrane assembly, and the pressure in the fresh-keeping space is ensured to be normal through the flexible elastic airbag;

[0014] Determining the oxygen concentration and carbon dioxide concentration in the fresh-keeping space;

[0015] The closing of the vacuum pump and the opening and closing of the carbon dioxide valve are controlled according to the oxygen concentration and the carbon dioxide concentration, so as to control the oxygen concentration and the carbon dioxide concentration to meet the preset preservation requirements.

[0016] Optionally, the refrigerator fresh-keeping drawer further includes a solenoid valve, the cavity further includes an exhaust hole, the vacuum pump is connected to the solenoid valve, and the solenoid valve is connected to the exhaust hole;

[0017] When the cavity and the drawer form a closed fresh-keeping space, the vacuum pump is turned on to discharge oxygen and carbon dioxide in the fresh-keeping space through the nitrogen-oxygen separation membrane assembly, and the pressure in the fresh-keeping space is ensured to be normal through the flexible elastic airbag, including:

[0018] When the cavity and the drawer form a closed fresh-keeping space, turning on the vacuum pump and the solenoid valve;

[0019] When the vacuum pump and the solenoid valve are turned on, the oxygen and carbon dioxide in the fresh-keeping space are discharged out of the cavity through the nitrogen-oxygen separation membrane assembly, the exhaust hole, the solenoid valve and the vacuum pump in sequence, and the pressure in the fresh-keeping space is reduced;

[0020] When the pressure in the fresh-keeping space is lower than the target pressure, the air outside the cavity enters the flexible elastic airbag to maintain the pressure in the fresh-keeping space at the target pressure; the target pressure is the initial pressure in the fresh-keeping space.

[0021] Optionally, the refrigerator fresh-keeping drawer further includes an oxygen concentration sensor and a carbon dioxide concentration sensor; and determining the oxygen concentration and carbon dioxide concentration in the fresh-keeping space includes:

[0022] Determine the oxygen concentration in the fresh-keeping space by using the oxygen concentration sensor;

[0023] The carbon dioxide concentration in the fresh-keeping space is determined by the carbon dioxide concentration sensor.

[0024] Optionally, the preset fresh-keeping requirement includes a preset oxygen concentration and a preset carbon dioxide concentration, and the closing of the vacuum pump and the opening and closing of the carbon dioxide valve are controlled according to the oxygen concentration and the carbon dioxide concentration to control the oxygen concentration and the carbon dioxide concentration to meet the preset fresh-keeping requirement, including:

[0025] When the oxygen concentration meets the preset oxygen concentration, the vacuum pump is turned off and the carbon dioxide valve is opened;

[0026] The closing of the carbon dioxide valve is controlled according to the carbon dioxide concentration and the preset carbon dioxide concentration.

[0027] Optionally, the refrigerator fresh-keeping drawer further includes a carbon dioxide separation membrane assembly, and controlling the closing of the carbon dioxide valve according to the carbon dioxide concentration and the preset carbon dioxide concentration includes:

[0028] When the carbon dioxide gas valve is opened, the carbon dioxide outside the cavity enters the fresh-keeping space through the carbon dioxide separation membrane assembly, and the pressure in the fresh-keeping space increases;

[0029] When the pressure of the fresh-keeping space is higher than the target pressure, the air in the flexible elastic airbag is discharged out of the cavity so that the pressure in the fresh-keeping space is maintained at the target pressure;

[0030] When the carbon dioxide concentration meets the preset carbon dioxide concentration, the carbon dioxide valve is closed.

[0031] Optionally, the cavity further includes an air inlet hole, and when the pressure in the fresh-keeping space is lower than the target pressure, the air outside the cavity enters the flexible elastic airbag to maintain the pressure in the fresh-keeping space at the target pressure, comprising:

[0032] When the pressure in the fresh-keeping space is lower than the target pressure, the air outside the cavity enters the flexible elastic airbag through the air inlet hole, and the volume of the flexible elastic airbag increases to maintain the pressure in the fresh-keeping space at the target pressure.

[0033] Optionally, when the pressure in the fresh-keeping space is higher than the target pressure, the air in the flexible elastic airbag is discharged out of the cavity so that the pressure in the fresh-keeping space is maintained at the target pressure, including:

[0034] When the pressure of the fresh-keeping space is higher than the target pressure, the air in the flexible elastic airbag is discharged out of the cavity through the air inlet hole, and the volume of the flexible elastic airbag is reduced to maintain the pressure in the fresh-keeping space at the target pressure.

[0035] Optionally, the refrigerator fresh-keeping drawer further includes an exhaust pipe and an air inlet pipe, the vacuum pump is connected to the solenoid valve through the air inlet pipe, and the solenoid valve is connected to the exhaust hole through the exhaust pipe;

[0036] When the vacuum pump and the solenoid valve are turned on, oxygen and carbon dioxide in the fresh-keeping space are discharged out of the cavity through the nitrogen-oxygen separation membrane assembly, the exhaust hole, the solenoid valve and the vacuum pump in sequence, and the pressure in the fresh-keeping space is reduced, including:

[0037] In the case where the cavity and the drawer form a closed fresh-keeping space, oxygen and carbon dioxide in the fresh-keeping space enter the exhaust pipe through the nitrogen and oxygen separation membrane assembly and the exhaust hole;

[0038] When the solenoid valve is opened, oxygen and carbon dioxide in the exhaust pipe enter the intake pipe through the solenoid valve;

[0039] When the vacuum pump is turned on, oxygen and carbon dioxide in the air inlet pipe are discharged out of the cavity through the vacuum pump, and the pressure in the fresh-keeping space is reduced.

[0040] The embodiment of the present application also discloses a control device for a refrigerator fresh-keeping drawer, the refrigerator fresh-keeping drawer comprising: a cavity, a drawer, a nitrogen-oxygen separation membrane assembly, a vacuum pump and a flexible elastic airbag; the cavity comprises a carbon dioxide gas valve, the drawer is located inside the cavity, the nitrogen-oxygen separation membrane assembly and the flexible elastic airbag are located on the cavity, the vacuum pump is connected to the cavity, and the device comprises:

[0041] An opening module is used to open the vacuum pump when the cavity and the drawer form a closed fresh-keeping space, so that the oxygen and carbon dioxide in the fresh-keeping space are discharged through the nitrogen and oxygen separation membrane assembly, and the pressure in the fresh-keeping space is ensured to be normal through the flexible elastic airbag;

[0042] A determination module, used to determine the oxygen concentration and carbon dioxide concentration in the fresh-keeping space;

[0043] The control module is used to control the closing of the vacuum pump and the opening and closing of the carbon dioxide valve according to the oxygen concentration and the carbon dioxide concentration, so as to control the oxygen concentration and the carbon dioxide concentration to meet the preset preservation requirements.

[0044] An embodiment of the present application also discloses an electronic device, including: a processor; and a memory, on which executable code is stored. When the executable code is executed, the processor executes a control method for a refrigerator fresh-keeping drawer as described in any one of the embodiments of the present application.

[0045] The embodiments of the present application also disclose one or more machine-readable media on which executable codes are stored. When the executable codes are executed, the processor executes the control method for the refrigerator fresh-keeping drawer as described in any one of the embodiments of the present application.

[0046] Compared with the prior art, the embodiments of the present application have the following advantages:

[0047] In the embodiment of the present application, the refrigerator fresh-keeping drawer is mainly composed of a cavity, a drawer, a nitrogen-oxygen separation membrane assembly, a vacuum pump, a carbon dioxide separation membrane assembly and a flexible elastic airbag, etc. The drawer can be pushed into the cavity to form a closed fresh-keeping space. A nitrogen-oxygen separation membrane assembly is arranged inside the cavity, and a vacuum pump is arranged outside. The vacuum pump is started to discharge the air in the fresh-keeping space through the nitrogen-oxygen separation membrane assembly, thereby reducing the oxygen concentration in the fresh-keeping space. In addition, a carbon dioxide separation membrane assembly and a flexible elastic airbag are also arranged on the cavity. When the gas in the fresh-keeping space is partially discharged, the internal pressure is reduced to form a negative pressure, forcing the flexible elastic airbag to expand and absorb the external air and then expand and occupy the internal fresh-keeping space. After reaching the preset oxygen concentration, the vacuum pump and the solenoid valve are closed and the carbon dioxide gas valve is opened. The external air enters the fresh-keeping space through the carbon dioxide separation membrane assembly, and the flexible elastic airbag gradually reduces the volume to the initial state. When the carbon dioxide reaches the preset value, the valve is closed, thereby greatly increasing the carbon dioxide concentration in the fresh-keeping space. When the drawer is opened, the flexible elastic airbag can be reduced and restored to the initial state.

[0048] The embodiment of the present application can increase the concentration of carbon dioxide in the fresh-keeping space while reducing the oxygen concentration, thereby further improving the preservation effect of food. Moreover, during the gas conditioning operation, there will be no large negative pressure inside the fresh-keeping space, and no special pressure-resistant structure and high-performance vacuum pump are required, thereby reducing product costs and improving product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic diagram of the structure of a refrigerator fresh-keeping drawer according to an embodiment of the present application;

[0050] Figure 2A It is an exploded schematic diagram of a refrigerator fresh-keeping drawer according to an embodiment of the present application;

[0051] Figure 2B is an exploded schematic diagram of another refrigerator fresh-keeping drawer according to an embodiment of the present application;

[0052] Figure 3A It is a cross-sectional schematic diagram of a refrigerator fresh-keeping drawer according to an embodiment of the present application;

[0053] Figure 3B is a cross-sectional schematic diagram of another refrigerator fresh-keeping drawer according to an embodiment of the present application;

[0054] Figure 4 This is a flowchart of the steps of an embodiment of a control method for a refrigerator fresh-keeping drawer of the present application;

[0055] Figure 5 This is a simple schematic diagram of the gas flow in a refrigerator fresh-keeping drawer according to an embodiment of the present application;

[0056] Figure 6 is a flowchart of another control method embodiment for a refrigerator fresh-keeping drawer of the present application;

[0057] Figure 7 This is a structural block diagram of an optional embodiment of a control device for a refrigerator fresh-keeping drawer of the present application;

[0058] Figure 8 It is a schematic diagram of the structure of a device provided in one embodiment of the present application.

[0059] Explanation of the reference numerals in the accompanying drawings: 1. drawer; 2. gasket; 3. cavity; 3-1. carbon dioxide separation membrane mounting seat; 3-2. exhaust hole; 3-3. nitrogen oxygen separation membrane mounting seat; 3-4. carbon dioxide gas valve; 3-5. air inlet hole; 4. carbon dioxide separation membrane assembly; 4-1. carbon dioxide separation membrane; 4-2. carbon dioxide separation membrane fixing frame; 5. solenoid valve; 6. vacuum pump; 7-1. exhaust pipe; 7-2. air inlet pipe; 8-1. nitrogen oxygen separation membrane; 8-2. nitrogen oxygen separation membrane fixing frame; 9. flexible elastic airbag; 10. oxygen concentration sensor; 11. carbon dioxide concentration sensor. DETAILED DESCRIPTION

[0060] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0061] In the prior art, there are often the following problems:

[0062] 1. With conventional oxygen reduction methods for controlled atmosphere fresh-keeping drawers, it is difficult for the internal space to reach the most suitable oxygen concentration (5% to 10%) for fruit and vegetable preservation under the conditions of existing controlled atmosphere membranes, vacuum pump performance and cavity wall strength.

[0063] 2. The gas-controlled oxygen reduction method using a high-performance vacuum pump and a pressure-resistant sealing structure will accelerate the water loss of leafy fruits and vegetables in a low-pressure environment, and will increase costs, complicate the structure, and reduce reliability.

[0064] 3. High carbon dioxide concentration has a strong inhibitory effect on molds and enzymes, and is also "toxic" to aerobic bacteria, thereby further improving food preservation effects. Existing products are unable to actively increase the carbon dioxide concentration in the preservation space.

[0065] 4. Although spontaneous atmosphere preservation technology can reduce oxygen concentration and increase carbon dioxide concentration through respiration, this process requires a sufficient amount of fruits and vegetables and takes at least 1 to 2 days. If non-living food (no respiration) is stored or the preservation space is opened in the middle, the preservation effect cannot be guaranteed.

[0066] To solve the above problems, the embodiment of the present application discloses a refrigerator fresh-keeping drawer, which comprises: a cavity 3, a drawer 1, a nitrogen-oxygen separation membrane assembly, a vacuum pump 6, a carbon dioxide separation membrane assembly 4 and a flexible elastic airbag 9; the cavity 3 comprises a carbon dioxide gas valve 3-4, the drawer 1 is located inside the cavity 3, the nitrogen-oxygen separation membrane 8-1 assembly, the carbon dioxide separation membrane assembly 4 and the flexible elastic airbag 9 are located on the cavity 3, and the vacuum pump 6 is connected to the cavity 3;

[0067] The drawer 1 and the cavity 3 form a closed fresh-keeping space;

[0068] The nitrogen and oxygen separation membrane 8-1 assembly is used to pass oxygen and carbon dioxide in the fresh-keeping space;

[0069] The vacuum pump 6 is used to extract the air in the fresh-keeping space;

[0070] The carbon dioxide separation membrane assembly 4 is used to pass carbon dioxide outside the cavity 3;

[0071] The flexible elastic airbag 9 is used to ensure the pressure in the fresh-keeping space;

[0072] The carbon dioxide valve 3 - 4 is used to allow the air outside the cavity 3 to enter the fresh-keeping space.

[0073] Reference Figure 1 , is a structural schematic diagram of a refrigerator fresh-keeping drawer according to an embodiment of the present application. The refrigerator fresh-keeping drawer is mainly composed of a drawer 1, a cavity 3, a nitrogen-oxygen separation membrane 8-1 component 4, etc. It can be understood that the drawer 1 is pushed into the cavity 3 to form an enclosed fresh-keeping space, and a carbon dioxide separation membrane component 4 is also arranged on the cavity 3.

[0074] Reference Figure 2A , is an exploded schematic diagram of a refrigerator fresh-keeping drawer in an embodiment of the present application. The front end of the cavity 3 is open, and horizontal guide rails are arranged on the left and right sides of the interior, so that the drawer 1 can be closed or opened from the front end opening of the cavity 3. A gasket 2 is arranged at the junction of the drawer 1 and the cavity 3. A rectangular frame is raised at the rear of the cavity 3, and an exhaust hole 3-2 is arranged at the rear to communicate with the outside. The exhaust hole 3-2 is connected to the solenoid valve 5 through the exhaust pipe 7-1, and then connected to the vacuum pump 6 through the air intake pipe 7-2. The top of the cavity 3 is partially hollowed out to form a carbon dioxide separation membrane mounting seat 3-1, and a carbon dioxide separation membrane 4-1 is installed, and then the hollow carbon dioxide separation membrane fixing frame 4-2 is buckled. A cavity is formed at the bottom and a carbon dioxide gas valve 3-4 is arranged. The cavity 3 is also provided with multiple air intake holes 3-5.

[0075] Reference Figure 2B , is an exploded schematic diagram of another refrigerator fresh-keeping drawer in an embodiment of the present application. The other parts of the cavity 3 are equipped with a flexible elastic airbag 9. The air outside the cavity 3 can enter the flexible elastic airbag 9 through the air inlet 3-5 and increase its expansion volume. The front part of the cavity 3 is provided with a partially hollowed-out nitrogen and oxygen separation membrane mounting seat 3-3, and a nitrogen and oxygen separation membrane 8-1 is installed, and then a hollowed-out nitrogen and oxygen separation membrane fixing frame 8-2 is buckled on the outermost.

[0076] Reference Figure 3A , is a cross-sectional schematic diagram of a refrigerator fresh-keeping drawer according to an embodiment of the present application, a carbon dioxide gas valve 3-4 is arranged at the top of the cavity 3, and an oxygen concentration sensor 10 and a carbon dioxide concentration sensor 11 are arranged inside the cavity 3.

[0077] Reference Figure 3B , is a cross-sectional schematic diagram of another refrigerator fresh-keeping drawer according to an embodiment of the present application, a carbon dioxide gas valve 3-4 is provided at the top of the cavity 3, and a flexible elastic airbag 9 is installed in the other part of the cavity 3.

[0078] Specifically, the refrigerator fresh-keeping drawer 1 in the embodiment of the present application is mainly composed of a cavity 3, a drawer 1, a nitrogen-oxygen separation membrane assembly, a vacuum pump 6, a carbon dioxide separation membrane assembly 4 and a flexible elastic airbag 9, etc. The drawer 1 can be pushed into the cavity 3 to form a closed fresh-keeping space. A nitrogen-oxygen separation membrane assembly is arranged inside the cavity 3, and a vacuum pump 6 is arranged outside. When the vacuum pump 6 is started, the air in the fresh-keeping space can be discharged through the nitrogen-oxygen separation membrane assembly, thereby reducing the oxygen concentration in the fresh-keeping space. In addition, a carbon dioxide separation membrane assembly 4 and a flexible elastic airbag 9 are also arranged on the cavity 3. When the gas in the fresh-keeping space is partially discharged, the internal pressure is reduced to form a negative pressure, forcing the flexible elastic airbag 9 to expand and absorb the external air and then expand and occupy the internal fresh-keeping space. After reaching the preset oxygen concentration, the vacuum pump 6 and the solenoid valve 5 are closed and the carbon dioxide gas valve 3-4 is opened, and the external air enters the fresh-keeping space through the carbon dioxide separation membrane assembly 4. At the same time, the flexible elastic airbag 9 gradually reduces the volume to the initial state, and closes the valve when the carbon dioxide reaches the preset value, thereby greatly increasing the carbon dioxide concentration in the fresh-keeping space. When the drawer 1 is opened, the flexible elastic airbag 9 can shrink and return to its initial state.

[0079] Since the oxygen concentration in the air is about 21% and the carbon dioxide concentration is about 0.031%, in the embodiment of the present application, it is necessary to reduce the oxygen concentration inside the fresh-keeping space to 5% and increase the carbon dioxide concentration to 16% through oxygen reduction operation, so as to increase the carbon dioxide concentration while reducing oxygen and achieve the best atmosphere preservation conditions for most foods.

[0080] Reference Figure 4 , is a flowchart of a control method embodiment for a refrigerator fresh-keeping drawer of the present application, comprising the following steps:

[0081] Step 401: When the cavity 3 and the drawer form a closed fresh-keeping space, the vacuum pump 6 is turned on to discharge the oxygen and carbon dioxide in the fresh-keeping space through the nitrogen-oxygen separation membrane assembly, and the pressure in the fresh-keeping space is ensured to be normal through the flexible elastic airbag 9;

[0082] The basic composition ratio of air is 78% nitrogen, 21% oxygen, 0.031% carbon dioxide, 0.939% rare gas, and 0.03% other gases and impurities. The optimum gas concentration for common food preservation is 3-10% oxygen and 3-5% carbon dioxide. Therefore, artificial methods are needed to reduce the oxygen concentration and increase the carbon dioxide concentration in the food storage environment. Membrane separation technology is a relatively mature and suitable gas conditioning preservation technology for refrigerator products. Gas conditioning is achieved through a vacuum device and a gas separation membrane. The principle is mainly that the size of gas molecules is different. When passing through micropores close to their molecular diameters, the gas passing rate is also different. The smaller the molecule, the faster it passes. The molecular diameters of carbon dioxide, oxygen and nitrogen are 0.33nm, 0.346nm and 0.364nm respectively. Therefore, when the pore size of the gas separation membrane is around 0.33nm, carbon dioxide can pass through the separation membrane in large quantities, while most of the oxygen and nitrogen are intercepted. It is called carbon dioxide separation membrane 4-1. When the pore size of the gas separation membrane is around 0.35 nm, carbon dioxide and oxygen can pass through the separation membrane in large quantities, while most of the nitrogen is retained. This is called nitrogen-oxygen separation membrane 8-1.

[0083] like Figure 2B As shown, in the embodiment of the present application, a nitrogen oxygen separation membrane 8-1 is installed on a nitrogen oxygen separation membrane mounting seat 3-3 at the front of the cavity 3, and then a hollow nitrogen oxygen separation membrane fixing frame 8-2 is buckled on to form a nitrogen oxygen separation membrane 8-1 assembly.

[0084] In the embodiment of the present application, when the drawer 1 is closed, a closed fresh-keeping space can be formed inside the cavity 3. After the vacuum pump 6 is started, the air inside the fresh-keeping space is discharged through the nitrogen-oxygen separation membrane 8-1, and the discharged gas is mainly oxygen and a small amount of nitrogen and carbon dioxide. At the same time, negative pressure is formed in the fresh-keeping space, forcing the flexible elastic airbag 9 to absorb external air and expand, thereby occupying the internal fresh-keeping space.

[0085] The flexible elastic airbag 9 in the embodiment of the present application is equivalent to a thin film that separates the internal and external spaces, and is an air pressure balance valve of the internal space, and its main function is to automatically adjust the internal air pressure. Since carbon dioxide will also be extracted during the oxygen reduction process, the carbon dioxide concentration is uncontrollable. Therefore, it is necessary to reduce the oxygen to a preset concentration at one time and then increase the carbon dioxide to a preset concentration. At this time, if there is no airbag with a variable volume, the wall of the cavity 3 will be under greater pressure.

[0086] In the prior art, while the oxygen in the fresh-keeping room is extracted through the first controlled atmosphere membrane, the negative pressure environment and the second controlled atmosphere membrane are used to fill the fresh-keeping room with nitrogen, so that the pressure inside and outside the fresh-keeping room is balanced and a nitrogen-rich and oxygen-poor gas atmosphere is formed. In this technical solution, the first controlled atmosphere membrane allows the oxygen in the fresh-keeping space to pass through and can block at least a part of the nitrogen in the fresh-keeping space; the second controlled atmosphere membrane allows the nitrogen in the air to pass through and can block at least a part of the oxygen in the air. However, due to the size of nitrogen and oxygen molecules, the existing nitrogen-oxygen separation membrane materials have a higher rate of oxygen passing than nitrogen, that is, theoretically, the second controlled atmosphere membrane is impossible to exist.

[0087] Therefore, the nitrogen-oxygen separation membrane 8-1 with a pore size of about 0.35 nm is still used in the embodiment of the present application, so that a large amount of nitrogen in the fresh-keeping space can be trapped. In this way, a gas environment suitable for food preservation can be formed in the fresh-keeping space, and the air pressure balance is maintained by the flexible elastic airbag 9 to prevent the wall of the cavity 3 from being subjected to excessive pressure. In addition, in the embodiment of the present application, the gas extraction inside the fresh-keeping space can be achieved without a high-performance vacuum pump 6.

[0088] The embodiment of the present application combines the nitrogen-oxygen separation membrane 8-1 and the flexible elastic airbag 9, which can not only reduce the oxygen inside the fresh-keeping space, but also ensure that there will be no large negative pressure inside the fresh-keeping space, and there is no need for a special pressure-resistant structure and a high-performance vacuum pump 6, thereby reducing product costs and improving product reliability.

[0089] In addition, the fresh-keeping space in the embodiment of the present application is sealed, and the oxygen concentration is reduced by the nitrogen-oxygen separation membrane 8-1, and the carbon dioxide concentration is increased by the carbon dioxide separation membrane 4-1, thereby further improving the fresh-keeping effect on food.

[0090] Step 402: determining the oxygen concentration and carbon dioxide concentration in the fresh-keeping space;

[0091] The best gas environment for food preservation usually requires an oxygen concentration of 3% to 10% and a carbon dioxide concentration of 3% to 5%. By real-time monitoring of these gas concentrations, it is possible to ensure that the gas environment in the fresh-keeping space is always in the best state, thereby maximizing the shelf life of the food. In addition, by real-time monitoring of these gas concentrations, the gas composition in the fresh-keeping space can be dynamically adjusted according to the actual gas concentration to ensure that the oxygen concentration and carbon dioxide concentration are always kept within the preset range.

[0092] like Figure 3A As shown, in the embodiment of the present application, the oxygen concentration and carbon dioxide concentration in the fresh-keeping space can be determined by the oxygen concentration sensor 10 and the carbon dioxide concentration sensor 11 arranged inside the cavity 3.

[0093] In one embodiment of the present application, monitoring of the gas concentration inside the fresh-keeping space can be performed at different time points. For example, the gas concentration inside the fresh-keeping space can be monitored at the moment the drawer 1 is pushed into the cavity 3, or the gas concentration inside the fresh-keeping space can be monitored after the vacuum pump 6 is turned on.

[0094] If the gas concentration inside the fresh-keeping space is monitored at the moment the drawer 1 is pushed into the cavity 3, it can be determined whether the vacuum pump 6 needs to be started to reduce the oxygen concentration inside the fresh-keeping space by the oxygen concentration inside the fresh-keeping space. However, in actual applications, the drawer 1 is usually connected to the external atmospheric environment before being pushed in, and the oxygen concentration in the atmosphere is about 21%. Therefore, at the moment the drawer 1 is pushed into the cavity 3, it is not necessary to determine whether to start the vacuum pump 6 by the oxygen concentration inside the fresh-keeping space. The gas concentration inside the fresh-keeping space can be monitored directly after the vacuum pump 6 is turned on, thereby reducing unnecessary judgment actions and improving the reliability and stability of the product.

[0095] Step 403: Control the closing of the vacuum pump 6 and the opening and closing of the carbon dioxide valves 3-4 according to the oxygen concentration and the carbon dioxide concentration, so as to control the oxygen concentration and the carbon dioxide concentration to meet the preset preservation requirements.

[0096] In the prior art, oxygen can be separated from the fresh-keeping space through a nitrogen-oxygen separation membrane assembly, thereby creating a low-oxygen atmosphere in the fresh-keeping space. The adjustable atmosphere-controlled membrane allows the oxygen in the outside space to be appropriately supplemented into the fresh-keeping space, allowing the carbon dioxide in the fresh-keeping space to escape to the outside space. However, this technical solution has a rationality problem. During the nitrogen-oxygen separation membrane 8-1 vacuuming and oxygen reduction stage: if the adjustable atmosphere-controlled membrane is closed, the pressure in the fresh-keeping space drops, resulting in the oxygen concentration being unable to be reduced or the drawer becoming seriously damaged; if the adjustable atmosphere-controlled membrane is opened, the outside oxygen will enter at the same time, resulting in a decrease in the oxygen reduction efficiency. In actual applications, it is impossible to increase the carbon dioxide concentration while reducing the oxygen concentration, and there is a large negative pressure inside.

[0097] The preset fresh-keeping requirements in the embodiment of the present application are that the oxygen concentration in the fresh-keeping space is 5% and the carbon dioxide concentration is 16%, so as to achieve the best atmosphere preservation conditions for most foods.

[0098] Therefore, in the embodiment of the present application, when the oxygen concentration inside the fresh-keeping space reaches the preset oxygen concentration, the vacuum pump 6 is turned off and the carbon dioxide valve 3-4 is turned on, and the external air enters the fresh-keeping space through the carbon dioxide separation membrane 4-1, and the gas entering is mainly carbon dioxide. At the same time, the volume of the flexible elastic airbag 9 is gradually reduced to the initial state, and the air valve is closed when the carbon dioxide concentration reaches the preset carbon dioxide concentration. When the drawer 1 is opened, the flexible elastic airbag 9 can be reduced and restored to the initial state. Thus, it is possible to significantly increase the carbon dioxide concentration while reducing the oxygen concentration, and there will be no large negative pressure inside the fresh-keeping space. Therefore, in the embodiment of the present application, a special pressure-resistant structure and a high-performance vacuum pump 6 are not required, thereby reducing product costs and improving product reliability.

[0099] The embodiment of the present application can increase the concentration of carbon dioxide in the fresh-keeping space while reducing the oxygen concentration, thereby further improving the preservation effect of food. Moreover, during the gas conditioning operation, there will be no large negative pressure inside the fresh-keeping space, and no special pressure-resistant structure and high-performance vacuum pump 6 are required, thereby reducing product costs and improving product reliability.

[0100] In one embodiment of the present application, the refrigerator fresh-keeping drawer further includes a solenoid valve 5, the cavity 3 further includes an exhaust hole 3-2, the vacuum pump 6 is connected to the solenoid valve 5, and the solenoid valve 5 is connected to the exhaust hole 3-2;

[0101] When the cavity 3 and the drawer 1 form a closed fresh-keeping space, the vacuum pump 6 is turned on to discharge the oxygen and carbon dioxide in the fresh-keeping space through the nitrogen and oxygen separation membrane 8-1 component, and the flexible elastic airbag 9 is used to ensure that the pressure in the fresh-keeping space is normal, including:

[0102] When the cavity 3 and the drawer 1 form a closed fresh-keeping space, the vacuum pump 6 and the solenoid valve 5 are turned on;

[0103] When the vacuum pump 6 and the solenoid valve 5 are turned on, the oxygen and carbon dioxide in the fresh-keeping space are discharged out of the cavity 3 through the nitrogen-oxygen separation membrane assembly, the exhaust hole 3-2, the solenoid valve 5 and the vacuum pump 6 in sequence, and the pressure in the fresh-keeping space is reduced;

[0104] When the pressure in the fresh-keeping space is lower than the target pressure, the air outside the cavity 3 enters the flexible elastic airbag 9 to maintain the pressure in the fresh-keeping space at the target pressure; the target pressure is the initial pressure in the fresh-keeping space.

[0105] like Figure 2AAs shown, the refrigerator fresh-keeping drawer 1 in the embodiment of the present application also includes a solenoid valve 5, and the cavity 3 also includes an exhaust hole 3-2. Specifically, the exhaust hole 3-2 is connected to the solenoid valve 5 through a pipeline, and then connected to the vacuum pump 6 through a pipeline.

[0106] In the embodiment of the present application, the electromagnetic valve 5 and the vacuum pump 6 need to work together to ensure that the gas extracted by the vacuum pump 6 can be smoothly discharged from the fresh-keeping space, while preventing external air from flowing back into the fresh-keeping space.

[0107] The coordinated work of the solenoid valve 5 and the vacuum pump 6 can be understood as follows: 1) the vacuum pump 6 reduces the oxygen concentration in the fresh-keeping space by extracting gas, especially oxygen and carbon dioxide, in the fresh-keeping space. By extracting gas, the vacuum pump 6 forms a negative pressure in the fresh-keeping space, causing the flexible elastic airbag 9 to expand and absorb external air; 2) the solenoid valve 5 controls the path of gas flow. When the solenoid valve 5 is opened, the gas in the fresh-keeping space is allowed to be discharged through the exhaust hole 3-2 to ensure that the gas flows along the predetermined path and avoid gas leakage or backflow.

[0108] Specifically, when the solenoid valve 5 and the vacuum pump 6 work together, the flow path of the gas inside the fresh-keeping space is: the gas in the fresh-keeping space (mainly oxygen and carbon dioxide) enters the exhaust hole 3-2 through the nitrogen and oxygen separation membrane 8-18-1 component, the gas passes through the solenoid valve 5 (gas flow is allowed when the solenoid valve 5 is turned on), the gas is pumped out of the fresh-keeping space through the vacuum pump 6 (gas is extracted when the vacuum pump 6 is turned on), and then discharged to the outside of the cavity 3.

[0109] In addition, as the gas is extracted, the pressure in the fresh-keeping space decreases. When the pressure is lower than the target pressure, the air outside the cavity 3 enters the flexible elastic airbag 9 through the air inlet holes 3-5, causing the flexible elastic airbag 9 to expand, occupy the internal volume of the fresh-keeping space, and maintain the internal pressure at the target pressure.

[0110] In the embodiment of the present application, the oxygen and carbon dioxide in the fresh-keeping space can be effectively discharged through the coordinated work of the vacuum pump 6 and the solenoid valve 5, realizing the oxygen reduction operation inside the fresh-keeping space. At the same time, through the adjustment of the flexible elastic airbag 9, the pressure in the fresh-keeping space is maintained, ensuring the reliability and stability of the product. In addition, the flow path of the gas in the fresh-keeping space from the fresh-keeping space to the outside of the cavity 3 is clear, ensuring that the gas flows along the predetermined path, avoiding gas leakage or backflow.

[0111] Moreover, the embodiment of the present application only uses one vacuum pump 6 to achieve the goal of reducing the oxygen concentration while increasing the carbon dioxide concentration, and there will be no large negative pressure inside the preservation space. A special pressure-resistant structure and a high-performance vacuum pump are not required, thereby reducing product costs and improving product reliability.

[0112] In one embodiment of the present application, the refrigerator fresh-keeping drawer further includes an oxygen concentration sensor 10 and a carbon dioxide concentration sensor 11; the determining of the oxygen concentration and the carbon dioxide concentration in the fresh-keeping space includes:

[0113] Determine the oxygen concentration in the fresh-keeping space by the oxygen concentration sensor 10;

[0114] The carbon dioxide concentration in the fresh-keeping space is determined by the carbon dioxide concentration sensor 11 .

[0115] like Figure 3A As shown, the refrigerator fresh-keeping drawer in the embodiment of the present application further includes an oxygen concentration sensor 10 and a carbon dioxide concentration sensor 11. The oxygen concentration sensor 10 is used to monitor the oxygen concentration in the fresh-keeping space in real time. Through the data feedback of the oxygen concentration sensor 10, the oxygen concentration in the fresh-keeping space can be understood, so as to decide whether it is necessary to further reduce the oxygen concentration; the carbon dioxide concentration sensor 11 is used to monitor the carbon dioxide concentration in the fresh-keeping space in real time. Through the data feedback of the carbon dioxide concentration sensor 11, the carbon dioxide concentration in the fresh-keeping space can be understood, so as to decide whether it is necessary to further increase the carbon dioxide concentration.

[0116] In one embodiment of the present application, the preset fresh-keeping requirement includes a preset oxygen concentration and a preset carbon dioxide concentration, and the closing of the vacuum pump 6 and the opening and closing of the carbon dioxide valve 3-4 are controlled according to the oxygen concentration and the carbon dioxide concentration to control the oxygen concentration and the carbon dioxide concentration to meet the preset fresh-keeping requirement, including:

[0117] When the oxygen concentration meets the preset oxygen concentration, the vacuum pump 6 is turned off and the carbon dioxide valve 3-4 is opened;

[0118] The closing of the carbon dioxide valve 3-4 is controlled according to the carbon dioxide concentration and the preset carbon dioxide concentration.

[0119] In an embodiment of the present application, when the oxygen concentration inside the fresh-keeping space reaches a preset oxygen concentration, the vacuum pump 6 is turned off and the solenoid valve 5 is also closed. At this time, the carbon dioxide concentration inside the fresh-keeping space is adjusted by controlling the opening and closing of the carbon dioxide valves 3-4 so that the gas concentration in the fresh-keeping space meets the fresh-keeping requirements.

[0120] In actual application, when the vacuum pump 6 and the solenoid valve 5 are closed, the carbon dioxide valve 3-4 will also be opened to reduce the carbon dioxide concentration inside the fresh-keeping space, and then the closing of the carbon dioxide valve 3-4 is controlled according to the real-time carbon dioxide concentration inside the fresh-keeping space.

[0121] The embodiment of the present application can accurately control the opening and closing of the vacuum pump 6 and the carbon dioxide valves 3-4 through real-time monitoring of the oxygen concentration sensor 10 and the carbon dioxide concentration sensor 11, thereby ensuring that the oxygen concentration and carbon dioxide concentration in the preservation space meet the preset preservation requirements, which not only improves the preservation effect, but also simplifies the operation process, improves the product reliability and user experience.

[0122] In one embodiment of the present application, the refrigerator fresh-keeping drawer further includes a carbon dioxide separation membrane assembly 4, and the closing of the carbon dioxide valve 3-4 is controlled according to the carbon dioxide concentration and the preset carbon dioxide concentration, including:

[0123] When the carbon dioxide gas valve 3-4 is opened, the carbon dioxide outside the cavity 3 enters the fresh-keeping space through the carbon dioxide separation membrane assembly 4, and the pressure in the fresh-keeping space increases;

[0124] When the pressure of the fresh-keeping space is higher than the target pressure, the air in the flexible elastic airbag 9 is discharged out of the cavity 3 to maintain the pressure in the fresh-keeping space at the target pressure;

[0125] When the carbon dioxide concentration meets the preset carbon dioxide concentration, the carbon dioxide valve 3-4 is closed.

[0126] like Figure 1 As shown, the refrigerator fresh-keeping drawer in the embodiment of the present application also includes a carbon dioxide separation membrane assembly 4. Specifically, as Figure 2A As shown, a carbon dioxide separation membrane assembly 4 is formed by installing a carbon dioxide separation membrane 4-1 on a carbon dioxide separation membrane mounting seat 3-1 on the top of the cavity 3 and then buckling a hollow carbon dioxide separation membrane fixing frame 4-2.

[0127] In the embodiment of the present application, when the carbon dioxide gas valve 3-4 is opened, the external air enters the fresh-keeping space through the carbon dioxide separation membrane 4-1, and the entering gas is mainly carbon dioxide. At the same time, the volume of the flexible elastic airbag 9 gradually shrinks from the initial state, and the gas valve is closed when the carbon dioxide concentration reaches the preset carbon dioxide concentration. Thus, the carbon dioxide concentration can be greatly increased while reducing oxygen, and there will be no large negative pressure inside the fresh-keeping space, and no special pressure-resistant structure and high-performance vacuum pump 6 are required, thereby reducing product costs and improving product reliability.

[0128] Since the oxygen concentration in the air is greater than the carbon dioxide concentration, and carbon dioxide is also extracted when oxygen is extracted, in the embodiment of the present application, the area of ​​the carbon dioxide separation membrane 4-1 is set to 5 to 10 times the area of ​​the nitrogen and oxygen separation membrane 8-1.

[0129] In the prior art, after vacuuming any box space in a refrigerator product, one or more control values ​​are pre-set, and the pressure in the box space is controlled according to the target, and the gas (carbon dioxide) is filled and released. In this technical solution, a compressed gas tank must be set inside the drawer. However, the gas tank is a consumable and needs to be constantly replaced or replenished with gas, which results in high cost and inconvenient operation. In addition, high-pressure gas tanks also have safety issues, so it is difficult to implement in actual products.

[0130] In the embodiment of the present application, there is no need to fill the box space with gas through a compressed gas tank. The problem of too low carbon dioxide concentration in the fresh-keeping space can be solved by the carbon dioxide separation membrane 4-1 and the carbon dioxide valve 3-4. The problem of pressure in the fresh-keeping space can be solved by the flexible elastic airbag 9. The carbon dioxide separation membrane assembly 4 and the flexible elastic airbag 9 solve the high cost, inconvenient operation and safety problems caused by the use of compressed gas tanks in the prior art. While achieving precise control of the oxygen concentration and carbon dioxide concentration in the fresh-keeping space, the pressure in the fresh-keeping space is also maintained stable, ensuring the preservation effect and product reliability.

[0131] Since the molecular diameters of carbon dioxide, oxygen and nitrogen are 0.33nm, 0.346nm and 0.364nm respectively, the nitrogen-oxygen separation membrane 8-1 can pass carbon dioxide and oxygen but not nitrogen, while the carbon dioxide separation membrane 4-1 can pass carbon dioxide but not nitrogen and oxygen. Therefore, the control method of a refrigerator fresh-keeping drawer provided in the embodiment of the present application must be completed at one time, that is, after the preset oxygen concentration is reached inside, the vacuum pump 6 and the solenoid valve 5 are closed, carbon dioxide enters through the carbon dioxide separation membrane 4-1, thereby avoiding carbon dioxide gas from entering through the carbon dioxide separation membrane 4-1 and being discharged through the nitrogen-oxygen separation membrane 8-1, making it difficult to reach a higher carbon dioxide concentration.

[0132] In one embodiment of the present application, the cavity 3 further includes an air inlet 3-5, and when the pressure in the fresh-keeping space is lower than the target pressure, the air outside the cavity 3 enters the flexible elastic airbag 9, so that the pressure in the fresh-keeping space is maintained at the target pressure, including:

[0133] When the pressure in the fresh-keeping space is lower than the target pressure, the air outside the cavity 3 enters the flexible elastic airbag 9 through the air inlet holes 3-5, and the volume of the flexible elastic airbag 9 increases to maintain the pressure in the fresh-keeping space at the target pressure.

[0134] like Figure 2A As shown, the cavity 3 in the embodiment of the present application is also provided with a plurality of air inlet holes 3-5.

[0135] Reference Figure 5 , is a simple schematic diagram of the gas flow in a refrigerator fresh-keeping drawer of an embodiment of the present application. When the oxygen, a small amount of nitrogen and carbon dioxide inside the fresh-keeping space are discharged through the nitrogen oxygen separation membrane 8-1, a negative pressure will be formed in the fresh-keeping space, thereby forcing the flexible elastic airbag 9 to absorb external air through the air inlet hole 3-5 and expand, thereby occupying the internal fresh-keeping space.

[0136] It can be understood that the expanded volume of the flexible elastic airbag 9 is equal to the reduced amount of oxygen in the fresh-keeping space.

[0137] In one embodiment of the present application, when the pressure of the fresh-keeping space is higher than the target pressure, the air in the flexible elastic airbag 9 is discharged out of the cavity 3 to maintain the pressure in the fresh-keeping space at the target pressure, including:

[0138] When the pressure of the fresh-keeping space is higher than the target pressure, the air in the flexible elastic airbag 9 is discharged to the outside of the cavity 3 through the air inlet holes 3-5, and the volume of the flexible elastic airbag 9 is reduced to maintain the pressure in the fresh-keeping space at the target pressure.

[0139] like Figure 5 As shown, when carbon dioxide in the external air enters the fresh-keeping space through the carbon dioxide separation membrane 4-1, the flexible elastic airbag 9 discharges air into the external environment through the air inlet 3-5, and the volume of the flexible elastic airbag 9 gradually shrinks to the initial state.

[0140] It can be understood that the reduced volume of the flexible elastic airbag 9 is equal to the increased amount of carbon dioxide in the fresh-keeping space.

[0141] In practical applications, according to the requirements of most food preservation, the oxygen concentration is about 5% and the carbon dioxide concentration is about 16%. In addition, since the oxygen concentration in the air is about 21%, most of the gas discharged through the nitrogen and oxygen separation membrane 8-1 is oxygen. Therefore, when 16% of the oxygen is discharged, the remaining oxygen concentration will be about 5%. Therefore, in the embodiment of the present application, the maximum expansion volume of the flexible elastic airbag 9 is set to 16% of the volume of the preservation space.

[0142] In the embodiment of the present application, the expansion and contraction of the flexible elastic airbag 9 depends on the preset fresh-keeping requirements. For example, when the maximum volume of the flexible elastic airbag 9 is 16% of the fresh-keeping space, the minimum oxygen concentration is 5% and the maximum carbon dioxide concentration is 16%. If the oxygen concentration is required to be 10%, the flexible elastic airbag 9 only needs to be expanded to 11%, and the maximum carbon dioxide concentration can only be 11%. If the required carbon dioxide concentration is 5%, the flexible elastic airbag 9 is further reduced to 5%.

[0143] Therefore, in the embodiment of the present application, by adding a flexible elastic airbag 9 inside the cavity 3, the expansion and contraction of the flexible elastic airbag 9 can ensure that there will be no large negative pressure inside the preservation space, and there is no need for a special pressure-resistant structure, thereby reducing product costs and improving product reliability.

[0144] In one embodiment of the present application, the refrigerator fresh-keeping drawer further includes an exhaust pipe 7-1 and an air inlet pipe 7-2, the vacuum pump 6 is connected to the solenoid valve 5 through the air inlet pipe 7-2, and the solenoid valve 5 is connected to the exhaust hole 3-2 through the exhaust pipe 7-1;

[0145] When the vacuum pump 6 and the solenoid valve 5 are turned on, the oxygen and carbon dioxide in the fresh-keeping space are discharged out of the cavity 3 through the nitrogen-oxygen separation membrane 8-1 assembly, the exhaust hole 3-2, the solenoid valve 5 and the vacuum pump 6 in sequence, and the pressure in the fresh-keeping space is reduced, including:

[0146] When the cavity 3 and the drawer form a closed fresh-keeping space, the oxygen and carbon dioxide in the fresh-keeping space enter the exhaust pipe 7-1 through the nitrogen-oxygen separation membrane 8-1 assembly and the exhaust hole 3-2;

[0147] When the solenoid valve 5 is opened, oxygen and carbon dioxide in the exhaust pipe 7-1 enter the intake pipe 7-2 through the solenoid valve 5;

[0148] When the vacuum pump 6 is turned on, the oxygen and carbon dioxide in the air inlet pipe 7 - 2 are discharged to the outside of the cavity 3 through the vacuum pump 6 , and the pressure in the fresh-keeping space is reduced.

[0149] like Figure 2A As shown, the refrigerator fresh-keeping drawer in the embodiment of the present application also includes an exhaust pipe 7-1 and an air intake pipe 7-2. Specifically, the exhaust hole 3-2 is connected to the outside, the exhaust hole 3-2 is connected to the solenoid valve 5 through the exhaust pipe 7-1, and then connected to the vacuum pump 6 through the air intake pipe 7-2.

[0150] In the embodiment of the present application, when the vacuum pump 6 and the solenoid valve 5 are turned on, the flow path of the gas in the fresh-keeping space (mainly a large amount of oxygen, a small amount of nitrogen and carbon dioxide) being discharged to the outside of the cavity 3 is: gas discharge path: the gas passes through the nitrogen oxygen separation membrane 8-1 component into the exhaust hole 3-2, and enters the exhaust pipe 7-1 from the exhaust hole 3-2. The gas enters the intake pipe 7-2 from the exhaust pipe 7-1 through the solenoid valve 5, and is then drawn out of the fresh-keeping space by the vacuum pump 6 through the intake pipe 7-2 and discharged to the outside of the cavity 3.

[0151] In the embodiment of the present application, the exhaust pipe 7-1 and the intake pipe 7-2 are arranged to provide a clear gas flow path, thereby ensuring that the gas flows along a predetermined path and avoiding gas leakage or backflow.

[0152] Since it is difficult to achieve absolute airtightness in the mechanical structure, or the user opens the drawer 1 to allow outside air to enter, when the internal oxygen concentration does not meet the preset oxygen concentration, the oxygen reduction operation is started again, so that the internal space is always maintained at the preset oxygen concentration that is optimal for freshness preservation, and the pressure of the cavity 3 is kept within the safe pressure range.

[0153] The embodiment of the present application can increase the concentration of carbon dioxide in the fresh-keeping space while reducing the oxygen concentration, thereby further improving the preservation effect of food. Moreover, during the gas conditioning operation, there will be no large negative pressure inside the fresh-keeping space, and no special pressure-resistant structure and high-performance vacuum pump are required, thereby reducing product costs and improving product reliability.

[0154] Reference Figure 6 , showing a step flow chart of another control method embodiment for a refrigerator fresh-keeping drawer of the present application.

[0155] Step 601: Is the drawer 1 closed? Step 602 can be performed only when the drawer 1 is closed to form a sealed fresh-keeping space with the cavity 3.

[0156] Step 602: Monitor the oxygen concentration and carbon dioxide concentration inside the fresh-keeping space.

[0157] Step 603: Whether the oxygen concentration meets the preset oxygen concentration. If the oxygen concentration does not meet the preset oxygen concentration, step 604 is executed; if the oxygen concentration meets the preset oxygen concentration, step 605 is executed.

[0158] Step 604, start the vacuum pump 6 and the electromagnetic valve 5, the carbon dioxide valves 3-4 are in a closed state, and monitor the oxygen concentration and carbon dioxide concentration inside the fresh-keeping space.

[0159] Step 605, close the vacuum pump 6 and the electromagnetic valve 5, the carbon dioxide valves 3-4 are in a closed state, and monitor the oxygen concentration and carbon dioxide concentration inside the fresh-keeping space.

[0160] Step 606: Whether the carbon dioxide concentration meets the preset carbon dioxide concentration. If the carbon dioxide concentration meets the preset carbon dioxide concentration, the process returns to step 602; if the carbon dioxide concentration does not meet the preset carbon dioxide concentration, the process proceeds to step 607.

[0161] Step 607, open the carbon dioxide gas valve 3-4, and the vacuum pump 6 and the solenoid valve 5 are in the closed state.

[0162] It should be noted that, for the method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present application are not limited by the described order of actions, because according to the embodiments of the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present application.

[0163] On the basis of the above-mentioned embodiment, this embodiment further provides a control device for a refrigerator fresh-keeping drawer, which is applied to electronic devices such as terminal devices and servers.

[0164] Reference Figure 7 , shows a structural block diagram of an embodiment of a control device for a refrigerator fresh-keeping drawer of the present application, which may specifically include the following modules:

[0165] The opening module 701 is used to open the vacuum pump 6 when the cavity 3 and the drawer 1 form a closed fresh-keeping space, so that the oxygen and carbon dioxide in the fresh-keeping space are discharged through the nitrogen and oxygen separation membrane assembly, and the pressure in the fresh-keeping space is ensured to be normal through the flexible elastic airbag 9;

[0166] A determination module 702 is used to determine the oxygen concentration and carbon dioxide concentration in the fresh-keeping space;

[0167] The control module 703 is used to control the closing of the vacuum pump 6 and the opening and closing of the carbon dioxide valves 3-4 according to the oxygen concentration and the carbon dioxide concentration, so as to control the oxygen concentration and the carbon dioxide concentration to meet the preset preservation requirements.

[0168] The embodiment of the present application also provides a non-volatile readable storage medium, which stores one or more modules (programs). When the one or more modules are applied to a device, the device can execute instructions (instructions) of each method step in the embodiment of the present application.

[0169] The present application embodiment provides one or more machine-readable media on which instructions are stored, and when executed by one or more processors, an electronic device executes one or more of the methods described in the above embodiments. In the present application embodiment, the electronic device includes various types of devices such as terminal devices and servers (clusters).

[0170] The embodiments of the present disclosure may be implemented as a device configured as desired using any appropriate hardware, firmware, software, or any combination thereof, and the device may include electronic devices such as terminal devices and servers (clusters). Figure 8An exemplary apparatus 800 that can be used to implement various embodiments described in this application is schematically illustrated.

[0171] For one embodiment, Figure 8 An exemplary apparatus 800 is shown having one or more processors 802, a control module (chip set) 804 coupled to at least one of the processor(s) 802, a memory 806 coupled to the control module 804, a non-volatile memory (NVM) / storage device 808 coupled to the control module 804, one or more input / output devices 810 coupled to the control module 804, and a network interface 812 coupled to the control module 804.

[0172] The processor 802 may include one or more single-core or multi-core processors, and the processor 802 may include any combination of general-purpose processors or special-purpose processors (such as graphics processors, application processors, baseband processors, etc.). In some embodiments, the device 800 can be used as a terminal device, server (cluster), etc. described in the embodiments of the present application.

[0173] In some embodiments, the apparatus 800 may include one or more computer-readable media (e.g., memory 806 or NVM / storage device 808) having instructions 814 and one or more processors 802 combined with the one or more computer-readable media and configured to execute the instructions 814 to implement a module to perform the actions described in the present disclosure.

[0174] For one embodiment, the control module 804 may include any suitable interface controller to provide any suitable interface to at least one of the processor(s) 802 and / or any suitable device or component in communication with the control module 804 .

[0175] The control module 804 may include a memory controller module to provide an interface to the memory 806. The memory controller module may be a hardware module, a software module, and / or a firmware module.

[0176] The memory 806 may be used, for example, to load and store data and / or instructions 814 for the device 800. For one embodiment, the memory 806 may include any suitable volatile memory, such as a suitable DRAM. In some embodiments, the memory 806 may include double data rate type four synchronous dynamic random access memory (DDR4 SDRAM).

[0177] For one embodiment, control module 804 may include one or more input / output controllers to provide an interface to NVM / storage device 808 and input / output device(s) 810 .

[0178] For example, NVM / storage 808 may be used to store data and / or instructions 814. NVM / storage 808 may include any suitable non-volatile memory (e.g., flash memory) and / or may include any suitable non-volatile storage device(s) (e.g., one or more hard disk drives (HDDs), one or more compact disk (CD) drives, and / or one or more digital versatile disk (DVD) drives).

[0179] NVM / storage device 808 may include storage resources that are physically part of the device on which apparatus 800 is installed, or it may be accessible to the device without being part of the device. For example, NVM / storage device 808 may be accessed via input / output device(s) 810 over a network.

[0180] (One or more) input / output devices 810 may provide an interface for the apparatus 800 to communicate with any other appropriate device, and the input / output device 810 may include a communication component, an audio component, a sensor component, etc. The network interface 812 may provide an interface for the apparatus 800 to communicate through one or more networks, and the apparatus 800 may wirelessly communicate with one or more components of a wireless network according to any of one or more wireless network standards and / or protocols, for example, accessing a wireless network based on a communication standard, such as WiFi, 2G, 3G, 4G, 5G, etc., or a combination thereof for wireless communication.

[0181] For one embodiment, at least one of the processor(s) 802 may be packaged together with the logic of one or more controllers (e.g., a memory controller module) of the control module 804. For one embodiment, at least one of the processor(s) 802 may be packaged together with the logic of one or more controllers of the control module 804 to form a system-in-package (SiP). For one embodiment, at least one of the processor(s) 802 may be integrated on the same die with the logic of one or more controllers of the control module 804. For one embodiment, at least one of the processor(s) 802 may be integrated on the same die with the logic of one or more controllers of the control module 804 to form a system-on-chip (SoC).

[0182] In various embodiments, the device 800 may be, but is not limited to, a terminal device such as a server, a desktop computing device, or a mobile computing device (e.g., a laptop computing device, a handheld computing device, a tablet computer, a netbook, etc.). In various embodiments, the device 800 may have more or fewer components and / or different architectures. For example, in some embodiments, the device 800 includes one or more cameras, a keyboard, a liquid crystal display (LCD) screen (including a touch screen display), a non-volatile memory port, multiple antennas, a graphics chip, an application-specific integrated circuit (ASIC), and a speaker.

[0183] Among them, the main control chip can be used as a processor or control module in the detection device, sensor data, location information, etc. are stored in a memory or NVM / storage device, the sensor group can be used as an input / output device, and the communication interface may include a network interface.

[0184] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0185] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0186] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable terminal device for controlling a refrigerator fresh-keeping drawer to produce a machine, so that instructions executed by the processor of the computer or other programmable terminal device for controlling a refrigerator fresh-keeping drawer generate instructions for implementing the processes in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0187] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable control terminal device for a refrigerator fresh-keeping drawer to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0188] These computer program instructions can also be loaded onto a computer or other programmable terminal device for controlling the refrigerator fresh-keeping drawer, so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable terminal device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0189] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0190] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0191] The above is a detailed introduction to a control method and device for a refrigerator fresh-keeping drawer, an electronic device and a storage medium provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A refrigerator fresh-keeping drawer, characterized in that: The refrigerator fresh-keeping drawer comprises: a cavity, a drawer, a nitrogen-oxygen separation membrane assembly, a vacuum pump, a carbon dioxide separation membrane assembly and a flexible elastic airbag; the cavity comprises a carbon dioxide gas valve, the drawer is located inside the cavity, the nitrogen-oxygen separation membrane assembly, the carbon dioxide separation membrane assembly and the flexible elastic airbag are located on the cavity, and the vacuum pump is connected to the cavity; The drawer and the cavity form a closed fresh-keeping space; The nitrogen-oxygen separation membrane assembly is used to pass oxygen and carbon dioxide in the fresh-keeping space; The vacuum pump is used to extract air from the fresh-keeping space; The carbon dioxide separation membrane assembly is used to pass carbon dioxide outside the cavity; The flexible elastic airbag is used to ensure the pressure in the fresh-keeping space; The carbon dioxide gas valve is used to allow air outside the cavity to enter the fresh-keeping space.

2. A control method for a refrigerator fresh-keeping drawer, characterized in that: The refrigerator fresh-keeping drawer comprises: a cavity, a drawer, a nitrogen-oxygen separation membrane assembly, a vacuum pump and a flexible elastic airbag; the cavity comprises a carbon dioxide gas valve, the drawer is located inside the cavity, the nitrogen-oxygen separation membrane assembly and the flexible elastic airbag are located on the cavity, the vacuum pump is connected to the cavity, and the method comprises: When the cavity and the drawer form a closed fresh-keeping space, the vacuum pump is turned on to discharge the oxygen and carbon dioxide in the fresh-keeping space through the nitrogen-oxygen separation membrane assembly, and the pressure in the fresh-keeping space is ensured to be normal through the flexible elastic airbag; Determining the oxygen concentration and carbon dioxide concentration in the fresh-keeping space; The closing of the vacuum pump and the opening and closing of the carbon dioxide valve are controlled according to the oxygen concentration and the carbon dioxide concentration, so as to control the oxygen concentration and the carbon dioxide concentration to meet the preset preservation requirements.

3. The method according to claim 2, characterized in that The refrigerator fresh-keeping drawer further includes a solenoid valve, the cavity further includes an exhaust hole, the vacuum pump is connected to the solenoid valve, and the solenoid valve is connected to the exhaust hole; When the cavity and the drawer form a closed fresh-keeping space, the vacuum pump is turned on to discharge oxygen and carbon dioxide in the fresh-keeping space through the nitrogen-oxygen separation membrane assembly, and the pressure in the fresh-keeping space is ensured to be normal through the flexible elastic airbag, including: When the cavity and the drawer form a closed fresh-keeping space, turning on the vacuum pump and the solenoid valve; When the vacuum pump and the solenoid valve are turned on, the oxygen and carbon dioxide in the fresh-keeping space are discharged out of the cavity through the nitrogen-oxygen separation membrane assembly, the exhaust hole, the solenoid valve and the vacuum pump in sequence, and the pressure in the fresh-keeping space is reduced; When the pressure in the fresh-keeping space is lower than the target pressure, the air outside the cavity enters the flexible elastic airbag to maintain the pressure in the fresh-keeping space at the target pressure; the target pressure is the initial pressure in the fresh-keeping space.

4. The method according to claim 2, characterized in that: The refrigerator fresh-keeping drawer further includes an oxygen concentration sensor and a carbon dioxide concentration sensor; the step of determining the oxygen concentration and the carbon dioxide concentration in the fresh-keeping space includes: Determine the oxygen concentration in the fresh-keeping space by using the oxygen concentration sensor; The carbon dioxide concentration in the fresh-keeping space is determined by the carbon dioxide concentration sensor.

5. The method according to claim 3, characterized in that: The preset fresh-keeping requirement includes a preset oxygen concentration and a preset carbon dioxide concentration, and the closing of the vacuum pump and the opening and closing of the carbon dioxide valve are controlled according to the oxygen concentration and the carbon dioxide concentration to control the oxygen concentration and the carbon dioxide concentration to meet the preset fresh-keeping requirement, including: When the oxygen concentration meets the preset oxygen concentration, the vacuum pump is turned off and the carbon dioxide valve is opened; The closing of the carbon dioxide valve is controlled according to the carbon dioxide concentration and the preset carbon dioxide concentration.

6. The method according to claim 3, characterized in that The refrigerator fresh-keeping drawer further includes a carbon dioxide separation membrane assembly, and the closing of the carbon dioxide valve is controlled according to the carbon dioxide concentration and the preset carbon dioxide concentration, including: When the carbon dioxide gas valve is opened, the carbon dioxide outside the cavity enters the fresh-keeping space through the carbon dioxide separation membrane assembly, and the pressure in the fresh-keeping space increases; When the pressure of the fresh-keeping space is higher than the target pressure, the air in the flexible elastic airbag is discharged out of the cavity so that the pressure in the fresh-keeping space is maintained at the target pressure; When the carbon dioxide concentration meets the preset carbon dioxide concentration, the carbon dioxide valve is closed.

7. The method according to claim 3, characterized in that The cavity further includes an air inlet hole, and when the pressure in the fresh-keeping space is lower than the target pressure, the air outside the cavity enters the flexible elastic airbag, so that the pressure in the fresh-keeping space is maintained at the target pressure, including: When the pressure in the fresh-keeping space is lower than the target pressure, the air outside the cavity enters the flexible elastic airbag through the air inlet hole, and the volume of the flexible elastic airbag increases to maintain the pressure in the fresh-keeping space at the target pressure.

8. The method according to claim 7, characterized in that When the pressure of the fresh-keeping space is higher than the target pressure, the air in the flexible elastic airbag is discharged out of the cavity so that the pressure in the fresh-keeping space is maintained at the target pressure, including: When the pressure of the fresh-keeping space is higher than the target pressure, the air in the flexible elastic airbag is discharged out of the cavity through the air inlet hole, and the volume of the flexible elastic airbag is reduced to maintain the pressure in the fresh-keeping space at the target pressure.

9. The method according to claim 3, characterized in that: The refrigerator fresh-keeping drawer further comprises an exhaust pipe and an air inlet pipe, the vacuum pump is connected to the solenoid valve via the air inlet pipe, and the solenoid valve is connected to the exhaust hole via the exhaust pipe; When the vacuum pump and the solenoid valve are turned on, oxygen and carbon dioxide in the fresh-keeping space are discharged out of the cavity through the nitrogen-oxygen separation membrane assembly, the exhaust hole, the solenoid valve and the vacuum pump in sequence, and the pressure in the fresh-keeping space is reduced, including: In the case where the cavity and the drawer form a closed fresh-keeping space, oxygen and carbon dioxide in the fresh-keeping space enter the exhaust pipe through the nitrogen and oxygen separation membrane assembly and the exhaust hole; When the solenoid valve is opened, oxygen and carbon dioxide in the exhaust pipe enter the intake pipe through the solenoid valve; When the vacuum pump is turned on, oxygen and carbon dioxide in the air inlet pipe are discharged out of the cavity through the vacuum pump, and the pressure in the fresh-keeping space is reduced.

10. A control device for a refrigerator fresh-keeping drawer, characterized in that: The refrigerator fresh-keeping drawer comprises: a cavity, a drawer, a nitrogen-oxygen separation membrane assembly, a vacuum pump and a flexible elastic airbag; the cavity comprises a carbon dioxide gas valve, the drawer is located inside the cavity, the nitrogen-oxygen separation membrane assembly and the flexible elastic airbag are located on the cavity, the vacuum pump is connected to the cavity, and the device comprises: An opening module is used to open the vacuum pump when the cavity and the drawer form a closed fresh-keeping space, so that the oxygen and carbon dioxide in the fresh-keeping space are discharged through the nitrogen and oxygen separation membrane assembly, and the pressure in the fresh-keeping space is ensured to be normal through the flexible elastic airbag; A determination module, used to determine the oxygen concentration and carbon dioxide concentration in the fresh-keeping space; The control module is used to control the closing of the vacuum pump and the opening and closing of the carbon dioxide valve according to the oxygen concentration and the carbon dioxide concentration, so as to control the oxygen concentration and the carbon dioxide concentration to meet the preset preservation requirements.

11. An electronic device, characterized in that: include: processor; and A memory having executable codes stored thereon, which, when executed, causes the processor to execute the control method for a refrigerator fresh-keeping drawer as described in any one of claims 2-9.

12. One or more machine-readable media having executable codes stored thereon, which, when executed, cause a processor to execute the control method for a refrigerator fresh-keeping drawer as claimed in any one of claims 2 to 9.

Images