Fresh-keeping device, refrigerator and control method thereof

Abstract

The invention discloses a fresh-keeping device, a refrigerator and a control method of the refrigerator, and the fresh-keeping device comprises an article storage device used for storing articles needing fresh keeping; the air adjusting device is connected with the article storage device and used for reducing the oxygen concentration in the article storage device; the carbon dioxide adjusting device is connected with the article storage device and used for adjusting the concentration of carbon dioxide in the article storage device; and the controller is connected with the carbon dioxide adjusting device and used for adjusting the release rate of the carbon dioxide according to the oxygen concentration in the article storage device so as to improve the oxygen reduction rate in the article storage device. The problem that in the prior art, the oxygen reduction rate of an air conditioning technology is low is solved, the oxygen reduction rate in the article storage device is increased, rapid air conditioning is achieved, energy consumption in the air conditioning process is reduced, and meanwhile the fresh-keeping effect of the article storage device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a fresh-keeping device, a refrigerator and a control method thereof. Background Art

[0002] As a device to extend the shelf life of food, refrigerators have been basically popularized in every household. With the development of refrigerator technology, consumers have higher and higher requirements for food preservation. While extending the shelf life, the quality of food must also be guaranteed. At present, controlled atmosphere preservation technology is a technology with a wide range of applications in the field of fruit and vegetable preservation. By controlling parameters such as temperature, humidity, carbon dioxide, oxygen concentration and ethylene concentration in the storage environment, it inhibits the respiration of fruits and vegetables, slows down the metabolic process, puts fruits and vegetables in a dormant state, prevents them from rotting and deteriorating, and extends the storage period.

[0003] The atmosphere-controlled preservation technology used for fruits and vegetables is divided into active atmosphere-controlled and passive atmosphere-controlled. Active atmosphere-controlled is to reduce the oxygen in the storage space by artificial means to achieve the purpose of oxygen reduction and preservation. The oxygen reduction rate of this method is significantly higher than that of passive atmosphere-controlled. However, active atmosphere-controlled is to reduce oxygen through a vacuum pump, which consumes a lot of energy. Passive atmosphere-controlled relies on the respiratory metabolism of fruits and vegetables themselves to reduce the oxygen concentration in the storage space. This method reduces oxygen slowly, and the reduction in oxygen concentration is small, generally only down to about 19%. In the process of reducing oxygen, active and passive atmosphere-controlled will cause the pressure in the storage room to decrease. Due to the pressure, the oxygen concentration continues to decrease, and it may take several hours to drop to the required concentration.

[0004] With regard to the problem of low oxygen reduction rate of controlled atmosphere technology in related technologies, no effective solution has been proposed so far. Summary of the invention

[0005] The present invention provides a fresh-keeping device, a refrigerator and a control method thereof, so as to at least solve the problem of low oxygen reduction rate of the gas conditioning technology in the prior art.

[0006] To solve the above technical problems, according to one aspect of an embodiment of the present invention, a fresh-keeping device is provided, comprising: an item storage device, used to store items that need to be kept fresh; an atmosphere control device, connected to the item storage device, used to reduce the oxygen concentration in the item storage device; a carbon dioxide adjustment device, connected to the item storage device, used to adjust the carbon dioxide concentration in the item storage device; a controller, connected to the carbon dioxide adjustment device, used to adjust the release rate of carbon dioxide according to the oxygen concentration in the item storage device, so as to increase the oxygen reduction rate in the item storage device.

[0007] Furthermore, the gas conditioning device comprises: a nitrogen-oxygen separation membrane assembly, which is arranged on the article storage device and is used to separate oxygen from the article storage device.

[0008] Furthermore, the carbon dioxide regulating device includes: a carbon dioxide collecting device, which is arranged outside the article storage device and is used to absorb and release carbon dioxide; a first pipeline, one end of which is connected to the carbon dioxide collecting device and the other end is connected to the article storage device, and is used to transport the carbon dioxide released by the carbon dioxide collecting device to the article storage device; a second pipeline, one end of which is connected to the outside air and the other end is connected to the carbon dioxide collecting device, and is used to pass air in the environment into the carbon dioxide collecting device so that the carbon dioxide collecting device absorbs carbon dioxide in the air.

[0009] Furthermore, the carbon dioxide regulating device also includes: an air pump, one end of which is connected to the carbon dioxide collecting device through a third pipeline, and the other end is connected to the outside air, and is used to continuously draw air into the carbon dioxide collecting device so that the carbon dioxide collecting device can quickly adsorb carbon dioxide; the air pump is also connected to the nitrogen and oxygen separation membrane assembly through a fourth pipeline, and is used to accelerate the oxygen reduction rate in the item storage device.

[0010] Furthermore, porous solid sodium carbonate is provided in the carbon dioxide collecting device; the carbon dioxide regulating device also includes: a heating device connected to the carbon dioxide collecting device, used to control the carbon dioxide collecting device to release carbon dioxide by heating the carbon dioxide collecting device; the controller is connected to the vacuum pump and the heating device, and is used to control the carbon dioxide collecting device to absorb and release carbon dioxide.

[0011] Furthermore, it also includes: an oxygen sensor, arranged in the item storage device, for detecting the oxygen concentration in the item storage device; a carbon dioxide sensor, arranged in the item storage device, for detecting the carbon dioxide concentration in the item storage device; a first control valve, arranged in the first pipeline, for controlling the on-off of the first pipeline; a second control valve, arranged in the second pipeline, for controlling the on-off of the second pipeline; a third control valve, arranged in the third pipeline, for controlling the on-off of the third pipeline; and a fourth control valve, arranged in the fourth pipeline, for controlling the on-off of the fourth pipeline.

[0012] According to another aspect of an embodiment of the present invention, a refrigerator is provided, comprising the fresh-keeping device as described above.

[0013] According to another aspect of an embodiment of the present invention, a refrigerator control method is provided, which is applied to a refrigerator as described above, and the method includes: detecting a current oxygen concentration in an item storage device; calculating operating parameters of a carbon dioxide regulating device according to the current oxygen concentration in the item storage device; and controlling the operation of the carbon dioxide regulating device according to the operating parameters of the carbon dioxide regulating device to adjust the release rate of carbon dioxide.

[0014] Furthermore, the operating parameters of the carbon dioxide regulating device are calculated according to the current oxygen concentration in the item storage device, including: obtaining the target oxygen concentration; calculating the difference between the current oxygen concentration and the target oxygen concentration; and determining the heating temperature of the heating device according to the difference between the current oxygen concentration and the target oxygen concentration; wherein, the greater the difference between the current oxygen concentration and the target oxygen concentration, the higher the heating temperature of the heating device.

[0015] Further, obtaining the target oxygen concentration includes: detecting whether the item storage device contains items that need to be preserved or whether the user inputs items that need to be preserved; when the item storage device contains items that need to be preserved or the user inputs items that need to be preserved, determining the target oxygen concentration according to the types of the items that need to be preserved; wherein a corresponding relationship between the types of the items and the target oxygen concentration is preset.

[0016] Furthermore, after obtaining the target oxygen concentration, it also includes: detecting whether the item storage device is airtight; if so, controlling the vacuum pump to turn on, and controlling the first control valve and the second control valve to turn on, and the third control valve and the fourth control valve to close, and then triggering the calculation of the difference between the current oxygen concentration and the target oxygen concentration.

[0017] Furthermore, after determining the heating temperature of the heating device according to the difference between the current oxygen concentration and the target oxygen concentration, it also includes: detecting whether the current oxygen concentration is less than or equal to the target oxygen concentration, and if so, controlling the vacuum pump and the first control valve to close; detecting whether the carbon dioxide concentration in the item storage device is greater than or equal to a preset carbon dioxide concentration, and if so, controlling the heating device and the second control valve to close.

[0018] Furthermore, it also includes: when items that need to be preserved are stored in the item storage device or the user inputs items that need to be preserved, the target carbon dioxide concentration range is determined according to the type of the items that need to be preserved; wherein a correspondence between the type of the items and the target carbon dioxide concentration range is preset; detecting the current carbon dioxide concentration in the item storage device; when the current carbon dioxide concentration is greater than or equal to the maximum value of the target carbon dioxide concentration range, controlling the second control valve to open, and controlling the heating device, the first control valve, the third control valve and the fourth control valve to close; when the current carbon dioxide concentration is less than or equal to the minimum value of the target carbon dioxide concentration range, controlling the second control valve to close.

[0019] According to another aspect of an embodiment of the present invention, there is provided a storage medium containing computer executable instructions, wherein the computer executable instructions are used to execute the refrigerator control method as described above when executed by a computer processor.

[0020] In the present invention, a fresh-keeping device is provided, wherein the oxygen in an item storage device such as a vegetable item storage device is discharged through an atmosphere-adjusting device, and the carbon dioxide can be transported into the item storage device or discharged from the item storage device through a carbon dioxide adjusting device, thereby adjusting the carbon dioxide concentration in the item storage device. Due to the pressure, the oxygen reduction rate of the atmosphere-adjusting device will continue to decrease as the oxygen concentration decreases. The release rate of carbon dioxide is regulated according to the oxygen concentration, the pressure in the item storage device is maintained, and the oxygen reduction rate in the compartment is increased, thereby realizing rapid atmosphere adjustment in the compartment and reducing energy consumption during the atmosphere adjustment process. At the same time, rapid atmosphere adjustment enables the environment in the item storage device to quickly reach the gas concentration required for the items to be kept fresh, can adapt to the rapid changes in the types or quantities of items to be kept fresh, etc., improves the fresh-keeping effect of the item storage device, and prolongs the fresh-keeping time of the items to be kept fresh. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of an optional structure of a fresh-keeping device according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of an optional structure of a refrigerator according to an embodiment of the present invention;

[0023] Figure 3 is an optional flow chart of a refrigerator control method according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram showing changes in the release rate of carbon dioxide according to an embodiment of the present invention as a function of the heating temperature of the heating device;

[0025] Figure 5is another optional flow chart of the refrigerator control method according to an embodiment of the present invention;

[0026] Figure 6 is an optional flow chart of a method for controlling carbon dioxide concentration according to an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Storage room; 2. Gas conditioning device; 3. Air pump; 4. Carbon dioxide regulating device; 5. Fourth pipeline; 6. First pipeline; 7. Third pipeline; 8. Second pipeline; 9. Fourth control valve; 10. First control valve; 11. Third control valve; 12. Second control valve; 13. Electric heating device; 14. Oxygen sensor; 15. Carbon dioxide sensor; 16. Refrigerator. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, 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 plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0031] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0032] It should be understood that although the terms first, second, third, etc. may be used to describe controllers in embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish controllers connected to different devices. For example, without departing from the scope of embodiments of the present invention, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller.

[0033] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0034] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or 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 commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0035] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] Example 1

[0037] In a preferred embodiment 1 of the present invention, a fresh-keeping device is provided. Specifically, Figure 1 An optional structural schematic diagram of the fresh-keeping device is shown in FIG. Figure 1 As shown, the fresh-keeping device comprises:

[0038] The article storage device 1 is used to store articles that need to be kept fresh; the article storage device may be a storage compartment of a refrigerator, in which articles such as fruits and vegetables that need to be kept fresh can be stored;

[0039] An atmosphere control device 2, connected to the object storage device 1, and used to reduce the oxygen concentration in the object storage device;

[0040] The carbon dioxide regulating device 4 is connected to the article storage device and is used to regulate the carbon dioxide concentration in the article storage device; the carbon dioxide regulating device 4 can both transport carbon dioxide into the article storage device 1 to increase the carbon dioxide concentration in the article storage device 1 and discharge carbon dioxide from the article storage device 1 to reduce the carbon dioxide concentration in the article storage device 1, thereby bidirectionally regulating the carbon dioxide concentration in the article storage device 1;

[0041] A controller is connected to the carbon dioxide regulating device and is used to adjust the release rate of carbon dioxide according to the oxygen concentration in the object storage device to increase the oxygen reduction rate in the object storage device.

[0042] In the above embodiment, a preservation device is provided, wherein the oxygen in the item storage device, such as the vegetable item storage device, is discharged through the atmosphere control device, and the carbon dioxide can be transported into the item storage device or discharged from the item storage device through the carbon dioxide adjustment device to adjust the carbon dioxide concentration in the item storage device. Due to the pressure, the oxygen reduction rate of the atmosphere control device will continue to decrease as the oxygen concentration decreases. The release rate of carbon dioxide is regulated according to the oxygen concentration, the pressure in the item storage device is maintained, and the oxygen reduction rate in the compartment is increased, thereby realizing rapid atmosphere control of the compartment and reducing energy consumption during the atmosphere control process. At the same time, rapid atmosphere control enables the environment in the item storage device to quickly reach the gas concentration required for the items to be preserved, can adapt to the rapid changes in the types or quantities of items to be preserved, etc., improves the preservation effect of the item storage device, and prolongs the preservation time of the items to be preserved.

[0043] In an optional embodiment of the present invention, the gas conditioning device includes: a nitrogen-oxygen separation membrane assembly, which is arranged on the article storage device and is used to separate oxygen from the article storage device. The gas conditioning device can adopt a passive gas conditioning method to save energy consumption during the gas conditioning process. At the same time, due to the presence of the carbon dioxide regulating device, the oxygen concentration can be effectively and quickly regulated.

[0044] Preferably, the carbon dioxide regulating device includes: a carbon dioxide collecting device, which is arranged outside the article storage device and is used to absorb and release carbon dioxide; a first pipeline 6, one end of which is connected to the carbon dioxide collecting device and the other end is connected to the article storage device 1, and is used to transport the carbon dioxide released by the carbon dioxide collecting device to the article storage device 1; a second pipeline 8, one end of which is connected to the outside air and the other end is connected to the carbon dioxide collecting device, and is used to pass the air in the environment into the carbon dioxide collecting device so that the carbon dioxide collecting device absorbs carbon dioxide in the air. Through the first pipeline 6 and the second pipeline 8, carbon dioxide is transported to the article storage device 1 to increase the carbon dioxide concentration in the article storage device 1, and carbon dioxide is discharged from the article storage device 1 to reduce the carbon dioxide concentration in the article storage device 1. There are many sources of carbon dioxide. In the present invention, a carbon dioxide collecting device is used to absorb carbon dioxide in the air, which avoids the equipment cost caused by the use of a carbon dioxide storage device for other carbon dioxide sources and the raw material cost caused by the supplement of carbon dioxide.

[0045] like Figure 1As shown, the carbon dioxide regulating device 4 also includes: an air pump 3, one end of which is connected to the carbon dioxide collecting device through the third pipeline 7, and the other end is connected to the outside air, which is used to continuously draw air into the carbon dioxide collecting device so that the carbon dioxide collecting device can quickly absorb carbon dioxide. One end of the carbon dioxide collecting device is connected to the air pump 3 through the third pipeline 7, and the other end is connected to the outside air. After the air pump 3 is turned on, the outside air is continuously drawn into the carbon dioxide collecting device so that it can quickly absorb a large amount of carbon dioxide.

[0046] In addition, the vacuum pump is also connected to the nitrogen-oxygen separation membrane assembly through the fourth pipeline 5, which is used to speed up the oxygen reduction rate in the item storage device 1. The nitrogen-oxygen separation membrane assembly is connected to the vacuum pump 3 outside the item storage device 1 through the fourth pipeline 5. When the item storage device 1 needs to reduce oxygen, under the operation of the vacuum pump 3, the oxygen in the item storage device 1 will be extracted through the nitrogen-oxygen separation membrane assembly, and other gases will be intercepted in the item storage device 1, thereby quickly increasing the oxygen reduction rate. The above scheme belongs to active gas conditioning. The gas conditioning device in the present invention can adopt active gas conditioning or passive gas conditioning. Active gas conditioning can adjust the oxygen concentration more quickly. Passive gas conditioning can also achieve effective and rapid adjustment of oxygen concentration due to the presence of the carbon dioxide regulating device. Through the carbon dioxide regulating device, the form of the gas conditioning device in the present invention is expanded, so that the function of the fresh-keeping device is more complete and the applicability is higher.

[0047] In another preferred embodiment of the present invention, a porous solid sodium carbonate is provided in the carbon dioxide collecting device; the carbon dioxide regulating device further comprises: a heating device 13 connected to the carbon dioxide collecting device, used to control the carbon dioxide collecting device to release carbon dioxide by heating the carbon dioxide collecting device; a controller connected to the air pump 3 and the heating device 13, used to control the carbon dioxide collecting device to absorb and release carbon dioxide. The carbon dioxide collecting device can collect carbon dioxide in the ambient air and then transport it to the storage room. The carbon dioxide collecting device absorbs carbon dioxide in the ambient air through porous solid sodium carbonate particles and converts it into sodium bicarbonate. By heating, the sodium bicarbonate is converted into sodium carbonate and releases carbon dioxide at the same time. The released carbon dioxide is supplemented into the room through the pipeline, thereby realizing the atmosphere conditioning and fresh-keeping in the room. Furthermore, different heating temperatures correspond to different carbon dioxide release rates, and the carbon dioxide release rate can be adjusted by adjusting the heating temperature of the electric heating device, such as by adjusting the voltage of the electric heating to change the heat generated when it works.

[0048] like Figure 1As shown, the preservation device also includes: an oxygen sensor 15, which is arranged in the item storage device 1, and is used to detect the oxygen concentration in the item storage device 1; a carbon dioxide sensor 16, which is arranged in the item storage device 1, and is used to detect the carbon dioxide concentration in the item storage device 1; a first control valve 10, which is arranged on the first pipeline 6, and is used to control the on-off of the first pipeline 6; a second control valve 12, which is arranged on the second pipeline 8, and is used to control the on-off of the second pipeline 8; a third control valve 11, which is arranged on the third pipeline 7, and is used to control the on-off of the third pipeline 7; a fourth control valve 9, which is arranged on the fourth pipeline 5, and is used to control the on-off of the fourth pipeline 5.

[0049] A first control valve is provided in the first pipeline. When the storage compartment (article storage device 1) needs to reduce oxygen, the first control valve will be opened. At this time, under the operation of the vacuum pump 3, the oxygen in the storage compartment will be extracted through the nitrogen-oxygen separation membrane assembly, while other gases will be intercepted in the compartment. The carbon dioxide collecting device 4 is located outside the storage compartment and is connected to the storage compartment through the second pipeline. Carbon dioxide can enter the compartment through the second pipeline. In addition, a second control valve is also provided in the second pipeline, and the circulation of carbon dioxide between the carbon dioxide collecting device and the storage compartment can be controlled by opening and closing the second control valve. Optimally, one end of the carbon dioxide collecting device is connected to the vacuum pump 3 through the third pipeline, and the other end is connected to the outside air. After the vacuum pump 3 is turned on, the outside air is continuously drawn into the carbon dioxide collecting device, so that it can quickly absorb a large amount of carbon dioxide. Furthermore, the third and fourth control valves are provided in the third and fourth pipelines. When carbon dioxide needs to be adsorbed, the third and fourth control valves are controlled to be opened, and when carbon dioxide needs to be released, the third and fourth control valves are controlled to be closed. In addition, an oxygen sensor 15 is provided in the storage compartment to detect the oxygen concentration in the storage compartment; and a carbon dioxide sensor 16 is provided to detect the carbon dioxide concentration in the storage compartment. In this way, the parameters detected by the two sensors can be used to control the vacuum pump to extract oxygen and release carbon dioxide into the storage compartment, thereby achieving atmosphere-controlled preservation of fruits and vegetables.

[0050] Example 2

[0051] In a preferred embodiment 2 of the present invention, a refrigerator is provided, comprising the fresh-keeping device in the above embodiment 1. Specifically, Figure 2 An optional structural schematic diagram of the refrigerator is shown, such as Figure 2 As shown, the refrigerator 16 includes:

[0052] The article storage device 1 can store fruits and vegetables that need to be kept fresh. A nitrogen-oxygen separation membrane assembly (gas conditioning device 2) is provided in the article storage device 1, and the nitrogen-oxygen separation membrane assembly is connected to the outside of the article storage device 1 or the air pump 3 through a first pipeline. In addition, a first control valve is provided in the first pipeline. When the storage compartment (article storage device 1) needs to reduce oxygen, the first control valve will be opened. At this time, under the operation of the air pump 3, the oxygen in the storage compartment will be extracted through the nitrogen-oxygen separation membrane assembly, and other gases will be intercepted in the compartment.

[0053] The fresh-keeping device also includes a carbon dioxide collecting device 4, which is a porous solid sodium carbonate particle, which can absorb carbon dioxide in the ambient air and convert it into sodium bicarbonate. When carbon dioxide is needed, sodium bicarbonate will be converted into sodium carbonate by heating, and carbon dioxide will be released at the same time. The carbon dioxide collecting device 4 is located outside the storage compartment, and is connected to the storage compartment through a second pipeline, and carbon dioxide can enter the compartment through the second pipeline. In addition, a second control valve is also provided in the second pipeline, and the circulation of carbon dioxide between the carbon dioxide collecting device and the storage compartment can be controlled by opening and closing the second control valve. Optimally, one end of the carbon dioxide collecting device is connected to the vacuum pump 3 through a third pipeline, and the other end is connected to the outside air. After the vacuum pump 3 is turned on, the outside air is continuously drawn into the carbon dioxide collecting device, so that it can quickly absorb a large amount of carbon dioxide. Furthermore, the third control valve 11 and the fourth control valve 9 are provided in the third pipeline 7 and the fourth pipeline 5. When carbon dioxide needs to be adsorbed, the third control valve 11 and the fourth control valve 9 are controlled to be opened, and when carbon dioxide needs to be released, the third control valve 11 and the fourth control valve 9 are controlled to be closed. Furthermore, different heating temperatures correspond to different carbon dioxide release rates, and the carbon dioxide release rate can be adjusted by adjusting the heating temperature of the electric heating device, such as by adjusting the voltage of the electric heating to change the heat generated when it works.

[0054] In addition, the storage compartment is also provided with an oxygen sensor 15 for detecting the oxygen concentration in the storage compartment; and a carbon dioxide sensor 16 for detecting the carbon dioxide concentration in the storage compartment. Thus, the parameters detected by the two sensors can be used to control the vacuum pump to extract oxygen and release carbon dioxide into the storage compartment, thereby achieving atmosphere-controlled preservation of fruits and vegetables.

[0055] In the above embodiment, a preservation device is provided, wherein the oxygen in the item storage device, such as the vegetable item storage device, is discharged through the atmosphere control device, and the carbon dioxide can be transported into the item storage device or discharged from the item storage device through the carbon dioxide adjustment device to adjust the carbon dioxide concentration in the item storage device. Due to the pressure, the oxygen reduction rate of the atmosphere control device will continue to decrease as the oxygen concentration decreases. The release rate of carbon dioxide is regulated according to the oxygen concentration to maintain the pressure in the item storage device, and the oxygen reduction rate in the compartment is increased, thereby realizing rapid atmosphere control of the compartment and reducing energy consumption during the atmosphere control process. At the same time, rapid atmosphere control enables the environment in the item storage device to quickly reach the gas concentration required for the items to be preserved, can adapt to the rapid changes in the types or quantities of items to be preserved, etc., improves the preservation effect of the item storage device, and prolongs the preservation time of the items to be preserved.

[0056] Example 3

[0057] In a preferred embodiment 3 of the present invention, a refrigerator control method is provided, which is applied to the refrigerator in the above embodiment 2. Specifically, Figure 3 An optional flow chart of the method is shown as follows: Figure 3 As shown, the method includes the following steps S302-S306:

[0058] S302: Detecting the current oxygen concentration in the item storage device;

[0059] S304: Calculating operating parameters of the carbon dioxide regulating device according to the current oxygen concentration in the item storage device;

[0060] S306: Controlling the operation of the carbon dioxide regulating device according to the operating parameters of the carbon dioxide regulating device to adjust the release rate of carbon dioxide.

[0061] In the above embodiment, a preservation device is provided, wherein the oxygen in the item storage device, such as the vegetable item storage device, is discharged through the atmosphere control device, and the carbon dioxide can be transported into the item storage device or discharged from the item storage device through the carbon dioxide adjustment device to adjust the carbon dioxide concentration in the item storage device. Due to the pressure, the oxygen reduction rate of the atmosphere control device will continue to decrease as the oxygen concentration decreases. The release rate of carbon dioxide is regulated according to the oxygen concentration to maintain the pressure in the item storage device, and the oxygen reduction rate in the compartment is increased, thereby realizing rapid atmosphere control of the compartment and reducing energy consumption during the atmosphere control process. At the same time, rapid atmosphere control enables the environment in the item storage device to quickly reach the gas concentration required for the items to be preserved, can adapt to the rapid changes in the types or quantities of items to be preserved, etc., improves the preservation effect of the item storage device, and prolongs the preservation time of the items to be preserved.

[0062] In a preferred embodiment of the present invention, the operation parameters of the carbon dioxide regulating device are calculated according to the current oxygen concentration in the article storage device, including: obtaining the target oxygen concentration; calculating the difference between the current oxygen concentration and the target oxygen concentration; determining the heating temperature of the heating device according to the difference between the current oxygen concentration and the target oxygen concentration; wherein, the greater the difference between the current oxygen concentration and the target oxygen concentration, the higher the heating temperature of the heating device. The difference between the current oxygen concentration and the target oxygen concentration is a positive value, and the greater the difference, the lower the current compartment oxygen concentration, the lower the oxygen reduction rate, and therefore more carbon dioxide is required, that is, the higher the heating temperature of the heating device. The smaller the difference between the current oxygen concentration and the target oxygen concentration, the higher the current compartment oxygen concentration, the higher the oxygen reduction rate, and therefore less carbon dioxide is required, that is, the lower the heating temperature of the heating device. When the initial oxygen concentration is high, the oxygen reduction rate is high at this time, so more carbon dioxide is not needed to be supplemented. As the oxygen concentration continues to decrease, the pressure in the compartment becomes lower and lower, resulting in the outside air being squeezed into the compartment. At this time, the oxygen reduction rate continues to decrease, so more carbon dioxide is needed to be supplemented into the compartment to increase the pressure in the compartment, thereby increasing the oxygen reduction rate. Figure 4 The schematic diagram showing the change of the release rate of carbon dioxide with the heating temperature of the heating device is shown. According to the figure, when the required release rate of carbon dioxide is known, the heating temperature of the heating device can be determined.

[0063] Furthermore, obtaining the target oxygen concentration includes: detecting whether the item storage device contains items that need to be preserved or whether the user inputs items that need to be preserved; when the item storage device contains items that need to be preserved or the user inputs items that need to be preserved, determining the target oxygen concentration according to the type of items that need to be preserved; wherein a correspondence between the type of items and the target oxygen concentration is preset. Through the above method, when the user stores the fresh-keeping items, the corresponding target oxygen concentration is determined, and the environment in the item storage device is accurately controlled to achieve the best preservation effect.

[0064] After obtaining the target oxygen concentration, it also includes: detecting whether the item storage device is airtight; if so, controlling the vacuum pump to open, and controlling the first control valve and the fourth control valve to open, and the second control valve and the third control valve to close, and then triggering the calculation of the difference between the current oxygen concentration and the target oxygen concentration. Detect whether the item storage device such as the fresh-keeping drawer is closed through sensors or other circuit switches. If not, keep the vacuum pump closed and remind the user to close the cavity door through the refrigerator interface display to ensure the airtightness of the fresh-keeping compartment. After obtaining the target oxygen concentration, control active gas adjustment to quickly adjust the oxygen concentration in the item storage device. Afterwards, adjust the carbon dioxide concentration according to the oxygen concentration or the oxygen reduction rate to optimize the gas concentration in the item storage device.

[0065] In addition, since the respiration of fruits and vegetables will release carbon dioxide, causing the carbon dioxide concentration in the compartment to continue to increase, the present invention also provides a method for controlling the carbon dioxide concentration. When it is detected that the carbon dioxide concentration in the compartment is higher than the upper limit of the preset food carbon dioxide concentration range, the first control valve is opened, the other control valves are closed, and the electric heating device is closed. At this time, the carbon dioxide collecting device adsorbs the carbon dioxide in the compartment; when the carbon dioxide concentration in the compartment is lower than the lower limit of the preset food carbon dioxide concentration range, the first control valve is closed. In the above-mentioned carbon dioxide and oxygen concentration adjustment process, it is necessary to determine the target gas concentration or gas concentration range, which can be achieved by querying a database. The database pre-stores a corresponding relationship table between fresh-keeping items and gas concentrations. Optionally, Table 1 shows the suitable gas conditioning concentrations for storing different fruits, and Table 2 shows the suitable gas conditioning concentrations for storing different vegetables. The gas concentrations corresponding to different fresh-keeping items are obtained by looking up the table, and then gas adjustment is performed.

[0066] Table 1

[0067] Fruit Name Oxygen concentration (%) Carbon dioxide concentration (%) apple 2～5 2～5 pear 3～5 1～3 Peach 3～5 3～5 kiwi 4～5 1～2 cherry 2～3 7～10 Grape 2～3 2～3 strawberry 8～10 5～10 litchi 3～6 2～5 Longan 6～8 2～5 date 3～6 3～5 cantaloupe 3～5 1～1.5 Plum 3～5 2～5

[0068] Table 2

[0069]

[0070] Select or input the food to be stored through the refrigerator interface, and the processor retrieves the database to set the oxygen and carbon dioxide concentration range suitable for the food according to the stored food. It should be noted that if a single food is stored, the oxygen and carbon dioxide concentration range suitable for the food can be selected; if multiple food is stored, the general oxygen and carbon dioxide concentration range can be selected. The suitable oxygen and carbon dioxide concentration ranges for storing different fruits and vegetables are shown in Tables 1 and 2. The general oxygen concentration range is 3% to 6%, and the general carbon dioxide concentration range is 1% to 3%.

[0071] Furthermore, after determining the heating temperature of the heating device according to the difference between the current oxygen concentration and the target oxygen concentration, it also includes: detecting whether the current oxygen concentration is less than or equal to the target oxygen concentration, if so, controlling the air pump and the fourth control valve to close; detecting whether the carbon dioxide concentration in the item storage device is greater than or equal to the preset carbon dioxide concentration, if so, controlling the heating device and the first control valve to close. In the above process, if the oxygen concentration drops to the target oxygen concentration, the air pump is closed, the fourth control valve is closed, and oxygen reduction is stopped. During the detection of the concentration of carbon dioxide in the compartment C 二氧化碳 , when C 二氧化碳 Reach the set carbon dioxide concentration C pAfter that, the first control valve is closed, the electric heating is turned off, and the release of carbon dioxide is stopped. By setting the above target oxygen concentration and preset carbon dioxide concentration, the corresponding device can be controlled to stop running in time to avoid overshoot and increase energy consumption.

[0072] Another refrigerator control method is also provided in a preferred embodiment 2 of the present invention. Specifically, Figure 5 An optional flow chart of the method is shown as follows: Figure 5 As shown, the method includes the following steps S501-S521:

[0073] S501: Start;

[0074] S502: Select or input stored ingredients through the refrigerator interface;

[0075] S503: The processor determines the oxygen and carbon dioxide concentration ranges by calling the database according to the food; the food to be stored is selected or input through the refrigerator interface, and the processor calls the database to set the oxygen and carbon dioxide concentration ranges suitable for the food according to the stored food. It should be noted that if a single food is stored, the oxygen and carbon dioxide concentration ranges suitable for the food can be selected; if multiple food is stored, the general oxygen and carbon dioxide concentration ranges can be selected. The suitable oxygen and carbon dioxide concentration ranges for storing different fruits and vegetables are shown in Tables 1 and 2. The general oxygen concentration range is 3% to 6%, and the general carbon dioxide concentration range is 1% to 3%;

[0076] S504: Detect whether the drawer is closed. If yes, proceed to step S506, otherwise proceed to step S505; Detect whether the drawer is closed by using a sensor or other circuit switch. If not, keep the vacuum pump closed and remind the user to close the door through the refrigerator interface display to ensure the airtightness of the fresh-keeping compartment;

[0077] S505: the vacuum pump is turned off;

[0078] S506: start the vacuum pump;

[0079] S507: The first and fourth control valves are opened, and the second and third control valves are closed; after the drawer is closed, the air pump is turned on, the first and fourth control valves are opened, and the second and third control valves are closed, and oxygen reduction in the room begins at this time;

[0080] S508: Detect oxygen concentration C in the room 氧气 ; Detect the oxygen concentration C in the room through the oxygen sensor 氧气 , compared with the current oxygen concentration C in the room 氧气 With the set oxygen concentration C s The difference between

[0081] S509:C氧气 -C S ≥A is true, if so, go to step S510, otherwise go to step S511;

[0082] S510: The electric heating temperature is set to T1; if the difference is ≥ A, that is, the current oxygen concentration in the compartment is high and the oxygen reduction rate is high, the electric heating temperature is controlled to T1;

[0083] S511:C 氧气 -C S ≥B is true, if so, go to step S512, otherwise go to step S513;

[0084] S512: The electric heating temperature is set to T2; as the oxygen concentration in the room continues to decrease, when the difference ≥ B, the electric heating temperature is controlled to T2;

[0085] S513:C 氧气 -C S ≥C is true, if so, go to step S514, otherwise go to step S515;

[0086] S514: The electric heating temperature is set to T3; as the oxygen concentration continues to decrease, the oxygen reduction rate will also decrease. When the difference is ≥ C, the electric heating temperature is controlled to T3;

[0087] S515: The electric heating temperature is set to T4; if the oxygen concentration drops to a difference value < C, the electric heating temperature is controlled to T4;

[0088] S516:C 氧气 ≤C S Is it true? If yes, go to step S517; otherwise, go to step S515;

[0089] S517: Vacuum pump is turned off;

[0090] S518: The fourth control valve is closed; when the oxygen concentration in the detection chamber reaches the set oxygen concentration, the air pump is turned off, the fourth control valve is closed, and oxygen reduction is stopped;

[0091] S519:C 二氧化碳 ≥C p Is it established? If yes, go to step S520, otherwise go to step S509;

[0092] S520: The first control valve is closed;

[0093] S521: The electric heating is turned off. During this period, the concentration of carbon dioxide in the chamber is detected. 二氧化碳 , when C 二氧化碳 Reach the set carbon dioxide concentration C pAfter that, the first control valve is closed, the electric heating is turned off, and the release of carbon dioxide stops.

[0094] Among them, 10≤A≤15, 5≤B<10, 2≤C<5. The carbon dioxide release rate of the carbon dioxide collection device changes with the change of the electric heating temperature. The higher the temperature, the higher the carbon dioxide release rate. Among them, the range of T1 is 30-50℃; the range of T2 is 50-60℃; the range of T3 is 60-80℃; the range of T4 is 80-100℃. When the initial oxygen concentration is high, the oxygen reduction rate is high at this time, so more carbon dioxide supplementation is not needed. As the oxygen concentration continues to decrease, the pressure in the compartment becomes lower and lower, causing the outside air to be squeezed into the compartment. At this time, the oxygen reduction rate continues to decrease, so more carbon dioxide is needed to be supplemented into the compartment to increase the pressure in the compartment, thereby increasing the oxygen reduction rate.

[0095] Since the respiration of fruits and vegetables releases carbon dioxide, causing the carbon dioxide concentration in the compartment to continue to increase, the present invention also provides a method for controlling the carbon dioxide concentration. Specifically, Figure 6 An optional flow chart of the method is shown as follows: Figure 6 As shown, the method includes the following steps S601-S605:

[0096] S601: Detect the carbon dioxide concentration C in the room 二氧化碳

[0097] S602:C 二氧化碳 ≥C4 is true, if yes, go to step S603, otherwise go to step S605;

[0098] S603: The first control valve is opened, the second, third and fourth control valves are closed, and the electric heating is turned off;

[0099] S604:C 二氧化碳 ≤C3 is true, if so, go to step S605, otherwise go to step S603;

[0100] S605: The first control valve is closed.

[0101] When it is detected that the carbon dioxide concentration in the compartment is higher than the upper limit C4 of the preset food carbon dioxide concentration range, the first control valve is opened, the other control valves are closed, and the electric heating device is turned off. At this time, the carbon dioxide collecting device absorbs the carbon dioxide in the compartment; when the carbon dioxide concentration CCO2 in the compartment is lower than the lower limit C3 of the preset food carbon dioxide concentration range, the first control valve is closed. Through the above scheme, the carbon dioxide concentration in the compartment is controlled to achieve the best preservation effect of fruits and vegetables.

[0102] Example 4

[0103] Based on the refrigerator control method provided in the above-mentioned embodiment 3, a storage medium containing computer executable instructions is also provided in a preferred embodiment 4 of the present invention. When the computer executable instructions are executed by a computer processor, they are used to execute the refrigerator control method as described above.

[0104] In the above embodiment, a preservation device is provided, wherein the oxygen in the item storage device, such as the vegetable item storage device, is discharged through the atmosphere control device, and the carbon dioxide can be transported into the item storage device or discharged from the item storage device through the carbon dioxide adjustment device to adjust the carbon dioxide concentration in the item storage device. Due to the pressure, the oxygen reduction rate of the atmosphere control device will continue to decrease as the oxygen concentration decreases. The release rate of carbon dioxide is regulated according to the oxygen concentration, the pressure in the item storage device is maintained, and the oxygen reduction rate in the compartment is increased, thereby realizing rapid atmosphere control of the compartment and reducing energy consumption during the atmosphere control process. At the same time, rapid atmosphere control enables the environment in the item storage device to quickly reach the gas concentration required for the items to be preserved, can adapt to the rapid changes in the types or quantities of items to be preserved, etc., improves the preservation effect of the item storage device, and prolongs the preservation time of the items to be preserved.

[0105] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0106] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0107] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0108] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0109] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0110] If the 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 this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0111] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not invented by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0112] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A fresh-keeping device, characterized in that: include: Article storage device, used for storing articles that need to be kept fresh; an atmosphere control device, connected to the article storage device, and used to reduce the oxygen concentration in the article storage device; a carbon dioxide regulating device connected to the article storage device and used to regulate the carbon dioxide concentration in the article storage device; A controller is connected to the carbon dioxide regulating device and is used to adjust the release rate of carbon dioxide according to the oxygen concentration in the object storage device to increase the oxygen reduction rate in the object storage device.

2. The fresh-keeping device according to claim 1, characterized in that: The gas conditioning device comprises: a nitrogen-oxygen separation membrane assembly, which is arranged on the article storage device and is used to separate oxygen from the article storage device.

3. The fresh-keeping device according to claim 2, characterized in that: The carbon dioxide regulating device comprises: A carbon dioxide collecting device, arranged outside the article storage device, for absorbing and releasing carbon dioxide; A first pipeline, one end of which is connected to the carbon dioxide collecting device and the other end of which is connected to the article storage device, and is used to transport the carbon dioxide released by the carbon dioxide collecting device to the article storage device; The second pipeline has one end connected to the outside air and the other end connected to the carbon dioxide collecting device, and is used to pass the air in the environment into the carbon dioxide collecting device so that the carbon dioxide collecting device absorbs carbon dioxide in the air.

4. The fresh-keeping device according to claim 3, characterized in that: The carbon dioxide regulating device also includes: An air pump, one end of which is connected to the carbon dioxide collecting device through a third pipeline, and the other end of which is connected to the outside air, and is used to continuously draw air into the carbon dioxide collecting device so that the carbon dioxide collecting device can quickly absorb carbon dioxide; The vacuum pump is also connected to the nitrogen-oxygen separation membrane assembly through a fourth pipeline to accelerate the oxygen reduction rate in the article storage device.

5. The fresh-keeping device according to claim 3, characterized in that: The carbon dioxide collecting device is provided with porous solid sodium carbonate; the carbon dioxide regulating device also includes: a heating device connected to the carbon dioxide collecting device, and used to control the carbon dioxide collecting device to release carbon dioxide by heating the carbon dioxide collecting device; The controller is connected to the air extraction pump and the heating device, and is used to control the carbon dioxide collecting device to absorb and release carbon dioxide.

6. The fresh-keeping device according to claim 4, characterized in that: Also includes: an oxygen sensor, disposed in the object storage device, for detecting the oxygen concentration in the object storage device; a carbon dioxide sensor, disposed in the object storage device, for detecting the concentration of carbon dioxide in the object storage device; A first control valve, disposed on the first pipeline, for controlling the on-off of the first pipeline; A second control valve, disposed on the second pipeline, for controlling the on-off of the second pipeline; A third control valve, disposed on the third pipeline, for controlling the on-off of the third pipeline; The fourth control valve is arranged on the fourth pipeline and is used for controlling the on-off of the fourth pipeline.

7. A refrigerator, characterized in that: The invention comprises a fresh-keeping device as claimed in any one of claims 1 to 6.

8. A refrigerator control method, applied to the refrigerator as claimed in claim 7, characterized in that: The method comprises: Detecting the current oxygen concentration in the item storage device; Calculating operating parameters of a carbon dioxide regulating device based on a current oxygen concentration in the object storage device; The operation of the carbon dioxide regulating device is controlled according to the operating parameters of the carbon dioxide regulating device to adjust the release rate of carbon dioxide.

9. The method according to claim 8, characterized in that Calculating the operating parameters of the carbon dioxide regulating device according to the current oxygen concentration in the object storage device includes: Obtain target oxygen concentration; Calculating a difference between the current oxygen concentration and the target oxygen concentration; The heating temperature of the heating device is determined according to the difference between the current oxygen concentration and the target oxygen concentration; wherein, the greater the difference between the current oxygen concentration and the target oxygen concentration, the higher the heating temperature of the heating device.

10. The method according to claim 9, characterized in that The step of obtaining the target oxygen concentration comprises: Detecting whether the item storage device contains items that need to be kept fresh or whether the user inputs items that need to be kept fresh; When items that need to be kept fresh are stored in the item storage device or the user inputs items that need to be kept fresh, the target oxygen concentration is determined according to the types of the items that need to be kept fresh; wherein a corresponding relationship between the types of the items and the target oxygen concentration is preset.

11. The method according to claim 9, characterized in that After obtaining the target oxygen concentration, the method further includes: Detecting whether the item storage device is airtight; If yes, the vacuum pump is controlled to be turned on, and the first control valve and the second control valve are controlled to be turned on, and the third control valve and the fourth control valve are controlled to be closed, and then the calculation of the difference between the current oxygen concentration and the target oxygen concentration is triggered.

12. The method according to claim 11, characterized in that After determining the heating temperature of the heating device according to the difference between the current oxygen concentration and the target oxygen concentration, the method further includes: Detecting whether the current oxygen concentration is less than or equal to the target oxygen concentration, and if so, controlling the air pump and the first control valve to close; Detect whether the carbon dioxide concentration in the article storage device is greater than or equal to a preset carbon dioxide concentration. If so, control the heating device and the second control valve to close.

13. The method according to claim 10, characterized in that Also includes: When items that need to be kept fresh are stored in the item storage device or the user inputs items that need to be kept fresh, the target carbon dioxide concentration range is determined according to the types of the items that need to be kept fresh; wherein a correspondence between the types of the items and the target carbon dioxide concentration range is preset; detecting a current carbon dioxide concentration in the item storage device; When the current carbon dioxide concentration is greater than or equal to the maximum value of the target carbon dioxide concentration range, the second control valve is controlled to open, and the heating device, the first control valve, the third control valve and the fourth control valve are controlled to close; When the current carbon dioxide concentration is less than or equal to the minimum value of the target carbon dioxide concentration range, the second control valve is controlled to be closed.

14. A storage medium containing computer executable instructions, characterized in that: The computer executable instructions are used to perform the refrigerator control method according to any one of claims 8 to 13 when executed by a computer processor.

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