Fresh-keeping device, refrigerator and control method of refrigerator

Abstract

The invention discloses a fresh-keeping device, a refrigerator and a control method of the refrigerator, and relates to the technical field of electric appliances. The fresh-keeping device comprises a refrigerating air duct, a humidifying air duct, a humidifying adsorption layer and a fresh-keeping drawer, the humidifying adsorption layer is located between the refrigerating air duct and the humidifying air duct so as to separate the air ducts, and the humidifying air duct and the fresh-keeping drawer form air path communication. The humidifying adsorption layer absorbs carbon dioxide gas in the refrigerating air channel located on the low-humidity side and releases the carbon dioxide gas in the humidifying air channel located on the high-humidity side, so that the carbon dioxide gas flows into the fresh-keeping drawer to keep food fresh. Therefore, carbon dioxide gas can be adsorbed from the air in the refrigeration air duct without chemical reaction and the like, and the use safety coefficient and use convenience of the refrigerator can be improved on the basis of simple structure and low production cost.

Description

Technical Field

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

[0002] A certain concentration of carbon dioxide gas, such as a concentration greater than 15%, can effectively inhibit the growth of bacteria and the respiration of fruits and vegetables, thereby extending the shelf life of food. The solution of preserving food by increasing the carbon dioxide concentration in the environment is suitable for food preservation scenarios in refrigerators.

[0003] In the process of using carbon dioxide to preserve food, the most important thing is to obtain high-concentration carbon dioxide. The current commonly used method of obtaining carbon dioxide is through chemical reactions (using acids and carbonates to react chemically to produce carbon dioxide). However, chemical reactions are prone to material leakage and require replacement of consumables. This reduces the safety factor and convenience of refrigerator use. Summary of the invention

[0004] In view of the problem that high concentration of carbon dioxide produced by chemical reactions reduces the safety factor and convenience of using a refrigerator, the present invention is proposed to provide a fresh-keeping device, a refrigerator and a control method for a refrigerator that overcome the above problem or at least partially solve the above problem.

[0005] Based on the first aspect of the present invention, a fresh-keeping device is provided, the fresh-keeping device comprising a refrigeration air duct, a humidification air duct, a humidification adsorption layer and a fresh-keeping drawer, the humidification adsorption layer is located between the refrigeration air duct and the humidification air duct to separate the air ducts, and the humidification air duct is connected to the fresh-keeping drawer through an air path;

[0006] The humidifying adsorption layer absorbs carbon dioxide gas in the refrigeration air duct located at the low humidity side, and releases carbon dioxide gas in the humidification air duct located at the high humidity side, so that the carbon dioxide gas flows into the fresh-keeping drawer to keep food fresh.

[0007] An optional invention content is that the humidification air duct is configured as a curved structure adapted to the shape of the refrigeration air duct.

[0008] An optional invention content, the cross-sectional shape of the humidification air duct includes one of the following: U-shape and wave shape.

[0009] An optional invention content, the wettable adsorption layer is made of strong base ion exchange resin.

[0010] An optional invention content, the preservation device also includes a vacuum pump, and the vacuum pump forms an air path connection with the preservation drawer and the humidification air duct respectively; wherein, when the vacuum pump is working, the gas in the preservation drawer is drawn into the humidification air duct.

[0011] An optional invention content is that a first connecting pipeline is further provided between the vacuum pump and the humidification air duct.

[0012] An optional invention content, the fresh-keeping device also includes a circulation fan, and the circulation fan is respectively connected to the fresh-keeping drawer and the humidification air duct to form an air path, wherein the circulation fan draws the gas in the humidification air duct into the fresh-keeping drawer when working.

[0013] An optional invention content is that a second connecting pipeline is further provided between the circulating fan and the humidification air duct.

[0014] An optional invention content is that the first connecting pipeline is connected to the air path of one end of the humidification air duct, and the second connecting pipeline is connected to the air path of the other end of the humidification air duct.

[0015] An optional invention content is that when at least two fresh-keeping drawers are provided, at least two of the fresh-keeping drawers are connected by an air path.

[0016] Based on the second aspect of the present invention, a refrigerator is further provided. The refrigerator has a fresh-keeping device as described in any one of the above invention contents.

[0017] An optional invention content, the refrigerator also includes a carbon dioxide sensor, and the carbon dioxide sensor is arranged in the fresh-keeping drawer to detect the carbon dioxide concentration in the fresh-keeping drawer.

[0018] An optional invention content, the refrigerator also includes a controller, the carbon dioxide sensor is electrically connected to the controller, and the vacuum pump of the preservation device and the circulating fan of the preservation device are electrically connected to the controller respectively, and the controller adjusts the working status of the vacuum pump and the circulating fan according to the carbon dioxide concentration detected by the carbon dioxide sensor.

[0019] Based on the third aspect of the present invention, a control method of a refrigerator is further provided. The refrigerator includes the refrigerator as described in the above invention. The control method is applied to the controller and includes:

[0020] Obtaining a carbon dioxide concentration value detected by the carbon dioxide sensor;

[0021] When the carbon dioxide concentration value does not meet the set concentration condition, the vacuum pump is started to send the gas in the fresh-keeping drawer into the humidification air duct, and the humidification adsorption layer absorbs the carbon dioxide gas in the refrigeration air duct located at the low humidity side, and releases the carbon dioxide gas in the humidification air duct located at the high humidity side, so as to increase the carbon dioxide concentration of the gas in the humidification air duct;

[0022] Starting the circulation fan to send the gas in the humidification air duct into the fresh-keeping drawer to increase the carbon dioxide concentration in the fresh-keeping drawer;

[0023] When it is determined that the carbon dioxide concentration value satisfies the set concentration condition, the vacuum pump and the circulation fan are stopped.

[0024] Compared with the prior art, the present invention includes a refrigeration duct, a humidification duct, a humidification adsorption layer and a fresh-keeping drawer. The humidification adsorption layer is located between the refrigeration duct and the humidification duct to separate the ducts, and the humidification duct is connected to the fresh-keeping drawer through an air path. The humidification adsorption layer absorbs carbon dioxide gas in the refrigeration duct on the low humidity side, and releases carbon dioxide gas in the humidification duct on the high humidity side, so that the carbon dioxide gas flows into the fresh-keeping drawer to preserve food. In this way, carbon dioxide gas can be adsorbed from the air in the refrigeration duct without obtaining it through chemical reactions, etc. On the basis of simple structure and low production cost, the safety factor and convenience of use of the refrigerator can be improved.

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0027] In the attached picture:

[0028] Figure 1 is a schematic diagram of the exploded structure of a fresh-keeping device provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of the three-dimensional structure of another fresh-keeping device provided by an embodiment of the present invention;

[0030] Figure 3yes Figure 2 A schematic diagram of the structure enlargement at the center A;

[0031] Figure 4 is a first structural schematic diagram of a fresh-keeping device provided by an embodiment of the present invention;

[0032] Figure 5 is a second structural schematic diagram of a fresh-keeping device provided by an embodiment of the present invention;

[0033] Figure 6 It is a schematic cross-sectional view of the structure of a fresh-keeping device provided by an embodiment of the present invention;

[0034] Figure 7 is a block diagram of an electrical connection structure of a refrigerator controller provided by an embodiment of the present invention;

[0035] Figure 8 is a schematic flow chart of steps of a refrigerator control method provided by an embodiment of the present invention;

[0036] Figure numerals: 1, refrigeration air duct; 101, refrigeration air outlet; 2, humidification air duct; 3, dehumidification adsorption layer; 4, fresh-keeping drawer; 401, air outlet; 402, air inlet; 5, vacuum pump; 6, first connecting pipeline; 7, circulation fan; 8, second connecting pipeline; 9, carbon dioxide sensor; 10, controller. DETAILED DESCRIPTION

[0037] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0038] A certain concentration of carbon dioxide gas, such as a concentration greater than 15%, can effectively inhibit the growth of bacteria and the respiration of fruits and vegetables, thereby extending the shelf life of food. The solution of preserving food by increasing the carbon dioxide concentration in the environment is suitable for food preservation scenarios in refrigerators.

[0039] In the process of using carbon dioxide to preserve food, the most important thing is to obtain high-concentration carbon dioxide. The current commonly used method of obtaining carbon dioxide is through chemical reactions (using acids and carbonates to react chemically to produce carbon dioxide). However, chemical reactions are prone to material leakage and require replacement of consumables. This reduces the safety factor and convenience of refrigerator use.

[0040] Based on the above technical problems, an embodiment of the present invention is proposed. The embodiment of the present invention may include a refrigeration air duct 1, a humidification air duct 2, a dehumidification adsorption layer 3 and a fresh-keeping drawer 4. The dehumidification adsorption layer 3 is located between the refrigeration air duct 1 and the humidification air duct 2 to separate the air ducts, and the humidification air duct 2 is connected to the fresh-keeping drawer 4 through an air path. The dehumidification adsorption layer 3 absorbs carbon dioxide gas in the refrigeration air duct 1 located on the low humidity side, and releases carbon dioxide gas in the humidification air duct 2 located on the high humidity side, so that the carbon dioxide gas flows into the fresh-keeping drawer 4 to preserve food. Therefore, carbon dioxide gas can be adsorbed from the air in the refrigeration air duct 1 without obtaining it through chemical reactions, etc. On the basis of simple structure and low production cost, the safety factor and convenience of use of the refrigerator can be improved.

[0041] Reference Figure 1-6 The embodiment of the present invention provides a fresh-keeping device, which may include a refrigeration air duct 1, a humidification air duct 2, a humidification adsorption layer 3, and a fresh-keeping drawer 4. The humidification adsorption layer 3 is located between the refrigeration air duct 1 and the humidification air duct 2 to separate the air ducts, and the humidification air duct 2 is connected to the fresh-keeping drawer 4 through an air path. The humidification adsorption layer 3 absorbs carbon dioxide gas in the refrigeration air duct 1 at the low humidity side, and releases carbon dioxide gas in the humidification air duct 2 at the high humidity side, so that the carbon dioxide gas flows into the fresh-keeping drawer 4 to preserve food.

[0042] In an embodiment of the present invention, the fresh-keeping device may include a refrigeration duct 1, a humidification duct 2, a moisture-adsorbing layer 3, and a fresh-keeping drawer 4. The refrigeration duct 1 is used to provide cooling air to the refrigerator compartment of the refrigerator. For example, outdoor air passes through the refrigeration system of the refrigerator to generate cooling air, and the refrigeration duct 1 is connected to the refrigeration system gas path to introduce cold air into the refrigeration duct 1, and a refrigeration air port 101 is provided on the refrigeration duct 1, so that cooling air is blown into the refrigerator compartment of the refrigerator through the refrigeration air port 101. For example, the air humidity in the refrigeration duct 1 is usually between 40% and 60%.

[0043] The dehumidification adsorption layer 3 is a structure made of dehumidification adsorption material, which is arranged between the refrigeration air duct 1 and the humidification air duct 2, so as to separate the air ducts of the refrigeration air duct 1 and the humidification air duct 2. In other words, the air path between the refrigeration air duct 1 and the humidification air duct 2 is divided by the dehumidification adsorption layer 3, so that the carbon dioxide gas in the refrigeration air duct 1 located at the low humidity side is absorbed by the dehumidification adsorption layer 3, and the carbon dioxide gas is released in the humidification air duct 2 located at the high humidity side without affecting the air path circulation of the refrigeration air duct 1 and the air path circulation of the humidification air duct 2. In this way, the carbon dioxide concentration in the humidification air duct 2 can be increased, and the carbon dioxide concentration in the fresh-keeping drawer 4 can be increased.

[0044] The humidifying adsorption material in the humidifying adsorption layer 3 can be operated at room temperature, using the evaporation free energy of water as the energy source for carbon dioxide regeneration. The adsorption process of carbon dioxide gas and the desorption process of carbon dioxide can be achieved by changing the water vapor in the environment. For example, in a dry state, the alkaline groups on the surface of the humidifying adsorption material can adsorb carbon dioxide in the air. When the humidity in the environment increases, the humidifying adsorption material releases carbon dioxide. The wet humidifying adsorption material can regain the adsorption capacity of carbon dioxide by drying and regenerating.

[0045] Since the fresh-keeping drawer 4 is usually used for preserving vegetables and fruits, and the fruits and vegetables themselves emit a large amount of water vapor, the humidity in the fresh-keeping drawer 4 in a sealed environment can reach more than 90%, for example, generally between 90% and 95%, so the humidification air duct 2 connected to the fresh-keeping drawer 4 is a high humidity environment. With respect to the humidification adsorption layer 3, the side of the humidification adsorption layer 3 close to the humidification air duct 2 is a high humidity side, and the side of the humidification adsorption layer 3 close to the refrigeration air duct 1 is a low humidity side. Therefore, the humidification adsorption layer 3 can repeatedly adsorb the carbon dioxide in the refrigeration air duct 1, and release the adsorbed carbon dioxide into the humidification air duct 2.

[0046] Thereby, carbon dioxide gas can be adsorbed from the external air (which can also be understood as the air flowing in the refrigeration duct 1) without obtaining it through chemical reactions, etc., which can improve the safety factor and convenience of use of the refrigerator on the basis of simple structure and low production cost.

[0047] An optional embodiment of the invention, referring to Figure 1 , Figure 2 as well as Figure 4 As shown, the humidification air duct 2 is configured as a curved structure that matches the shape of the refrigeration air duct 1 .

[0048] In the embodiment of the present invention, the humidification air duct 2 is configured as a curved structure that matches the shape of the cooling air duct 1, so that the extension length of the variable humidification adsorption layer 3 between the two air ducts can be further expanded. In other words, the contact area between the variable humidification adsorption layer 3 and the humidification air duct 2 is increased, and the contact area between the variable humidification adsorption layer 3 and the cooling air duct 1 is increased. In this way, the cumulative absorption efficiency of the variable humidification adsorption layer 3 on the carbon dioxide of the flowing air in the cooling air duct 1 can be improved, and the release efficiency of the carbon dioxide of the variable humidification adsorption layer 3 in the humidification air duct 2 can be improved.

[0049] An optional embodiment of the invention, referring to Figure 1 , Figure 2 as well as Figure 4 As shown, the cross-sectional shape of the humidification air duct 2 includes one of the following: U-shaped and wavy.

[0050] In the embodiment of the present invention, the cross-sectional shape of the humidification air duct 2 can be U-shaped or wavy. Thus, the extension length of the humidification air duct 2 in the refrigerator compartment can be increased, and the extension length of the humidification adsorption layer 3 between the two air ducts can be further expanded. The U-shaped design or the wavy design can facilitate processing and can facilitate the air in the two air ducts to flow under less resistance.

[0051] In an optional embodiment of the invention, the fresh-keeping device may include a refrigeration air duct 1, a humidification air duct 2, a dehumidification adsorption layer 3, and a fresh-keeping drawer 4. The dehumidification adsorption layer 3 is located between the refrigeration air duct 1 and the humidification air duct 2 to separate the air ducts, and the humidification air duct 2 is connected to the fresh-keeping drawer 4 through an air path. The dehumidification adsorption layer 3 absorbs carbon dioxide gas in the refrigeration air duct 1 located at the low humidity side, and releases carbon dioxide gas in the humidification air duct 2 located at the high humidity side, so that the carbon dioxide gas flows into the fresh-keeping drawer 4 to preserve food. The dehumidification adsorption layer 3 is made of a strong base ion exchange resin.

[0052] In an embodiment of the present invention, the fresh-keeping device may include a refrigeration duct 1, a humidification duct 2, a moisture-adsorbing layer 3, and a fresh-keeping drawer 4. The refrigeration duct 1 is used to provide cooling air to the refrigerator compartment of the refrigerator. For example, outdoor air passes through the refrigerator refrigeration system to generate cooling air, the refrigeration duct 1 is connected to the refrigeration system gas path, and the cold air is introduced into the refrigeration duct 1. A refrigeration air port 101 is provided on the refrigeration duct 1, so that cooling air is blown into the refrigerator compartment through the refrigeration air port 101.

[0053] The dehumidification adsorption layer 3 is a structure made of dehumidification adsorption material, which is arranged between the refrigeration air duct 1 and the humidification air duct 2, so as to separate the air ducts of the refrigeration air duct 1 and the humidification air duct 2. In other words, the air path between the refrigeration air duct 1 and the humidification air duct 2 is divided by the dehumidification adsorption layer 3, so that the carbon dioxide gas in the refrigeration air duct 1 located at the low humidity side is absorbed by the dehumidification adsorption layer 3, and the carbon dioxide gas is released in the humidification air duct 2 located at the high humidity side without affecting the air path circulation of the refrigeration air duct 1 and the air path circulation of the humidification air duct 2. In this way, the carbon dioxide concentration in the humidification air duct 2 can be increased, and the carbon dioxide concentration in the fresh-keeping drawer 4 can be increased.

[0054] The humidifying adsorption material in the humidifying adsorption layer 3 can be operated at room temperature, using the evaporation free energy of water as the energy source for carbon dioxide regeneration. The adsorption process of carbon dioxide gas and the desorption process of carbon dioxide can be achieved by changing the water vapor in the environment. For example, in a dry state, the alkaline groups on the surface of the humidifying adsorption material can adsorb carbon dioxide in the air. When the humidity in the environment increases, the humidifying adsorption material releases carbon dioxide. The wet humidifying adsorption material can regain the adsorption capacity of carbon dioxide by drying and regenerating.

[0055] Since the fresh-keeping drawer 4 is usually used for preserving vegetables and fruits, and the fruits and vegetables themselves emit a large amount of water vapor, the humidity in the fresh-keeping drawer 4 in a sealed environment can reach more than 90%, for example, generally between 90% and 95%, so the humidification air duct 2 connected to the fresh-keeping drawer 4 is a high humidity environment. With respect to the humidification adsorption layer 3, the side of the humidification adsorption layer 3 close to the humidification air duct 2 is a high humidity side, and the side of the humidification adsorption layer 3 close to the refrigeration air duct 1 is a low humidity side. Therefore, the humidification adsorption layer 3 can repeatedly adsorb the carbon dioxide in the refrigeration air duct 1, and release the adsorbed carbon dioxide into the humidification air duct 2.

[0056] The variable-humidification adsorption layer 3 is made of a strong-base ion exchange resin. The strong-base ion exchange resin refers to an ion exchange resin with a strong-base group. Ion exchange resin refers to a polymer compound with a functional group (an active gene with exchange ions). For example, a strong-base group may include but is not limited to a quaternary ammonium group, etc. In a dry state, the alkaline groups on the surface of the variable-humidification adsorption material can adsorb carbon dioxide in the air. When the humidity in the environment increases, the variable-humidification adsorption material releases carbon dioxide. The wet variable-humidification adsorption material can regain its carbon dioxide adsorption capacity by drying and regenerating.

[0057] In some embodiments, the variable humidity adsorption layer 3 may include a frame and a variable humidity adsorption film disposed on the frame, and the variable humidity adsorption film is made of a strong base ion exchange resin. The frame may be made of polystyrene and other materials. Thus, carbon dioxide gas can be adsorbed from the external air (which can also be understood as the air flowing in the refrigeration air duct 1) without obtaining it through chemical reactions, etc., and the safety factor and convenience of use of the refrigerator can be improved on the basis of simple structure and low production cost.

[0058] An optional embodiment of the invention, referring to Figure 1 , Figure 2 , Figure 4 , Figure 5 as well as Figure 6 As shown, the fresh-keeping device includes a refrigeration air duct 1, a humidification air duct 2, a humidification adsorption layer 3, a fresh-keeping drawer 4 and a vacuum pump 5. The humidification adsorption layer 3 is located between the refrigeration air duct 1 and the humidification air duct 2 to separate the air ducts, and the humidification air duct 2 is connected to the fresh-keeping drawer 4 through an air path. The humidification adsorption layer 3 absorbs carbon dioxide gas in the refrigeration air duct 1 located on the low humidity side, and releases carbon dioxide gas in the humidification air duct 2 located on the high humidity side, so that the carbon dioxide gas flows into the fresh-keeping drawer 4 to preserve food. The vacuum pump 5 is connected to the fresh-keeping drawer 4 and the humidification air duct 2 through an air path. When the vacuum pump 5 is working, it extracts the gas in the fresh-keeping drawer 4 into the humidification air duct 2.

[0059] In the embodiment of the present invention, the refrigeration air duct 1 is used to provide cooling air to the refrigerator compartment. For example, outdoor air passes through the refrigeration system of the refrigerator to generate cooling air, and the refrigeration air duct 1 is connected to the refrigeration system gas path to introduce cold air into the refrigeration air duct 1, and a refrigeration air port 101 is provided on the refrigeration air duct 1, so that cooling air is blown into the refrigerator compartment through the refrigeration air port 101.

[0060] The dehumidification adsorption layer 3 is a structure made of dehumidification adsorption material, which is arranged between the refrigeration air duct 1 and the humidification air duct 2, so as to separate the air ducts of the refrigeration air duct 1 and the humidification air duct 2. In other words, the air path between the refrigeration air duct 1 and the humidification air duct 2 is divided by the dehumidification adsorption layer 3, so that the carbon dioxide gas in the refrigeration air duct 1 located at the low humidity side is absorbed by the dehumidification adsorption layer 3, and the carbon dioxide gas is released in the humidification air duct 2 located at the high humidity side without affecting the air path circulation of the refrigeration air duct 1 and the air path circulation of the humidification air duct 2. In this way, the carbon dioxide concentration in the humidification air duct 2 can be increased, and the carbon dioxide concentration in the fresh-keeping drawer 4 can be increased.

[0061] The humidifying adsorption material in the humidifying adsorption layer 3 can be operated at room temperature, using the evaporation free energy of water as the energy source for carbon dioxide regeneration. The adsorption process of carbon dioxide gas and the desorption process of carbon dioxide can be achieved by changing the water vapor in the environment. For example, in a dry state, the alkaline groups on the surface of the humidifying adsorption material can adsorb carbon dioxide in the air. When the humidity in the environment increases, the humidifying adsorption material releases carbon dioxide. The wet humidifying adsorption material can regain the adsorption capacity of carbon dioxide by drying and regenerating.

[0062] Since the fresh-keeping drawer 4 is usually used for preserving vegetables and fruits, and the fruits and vegetables themselves emit a large amount of water vapor, the humidity in the fresh-keeping drawer 4 in a sealed environment can reach more than 90%, for example, generally between 90% and 95%, so the humidification air duct 2 connected to the fresh-keeping drawer 4 is a high humidity environment. With respect to the humidification adsorption layer 3, the side of the humidification adsorption layer 3 close to the humidification air duct 2 is a high humidity side, and the side of the humidification adsorption layer 3 close to the refrigeration air duct 1 is a low humidity side. Therefore, the humidification adsorption layer 3 can repeatedly adsorb the carbon dioxide in the refrigeration air duct 1, and release the adsorbed carbon dioxide into the humidification air duct 2.

[0063] Thereby, carbon dioxide gas can be adsorbed from the external air (which can also be understood as the air flowing in the refrigeration duct 1) without obtaining it through chemical reactions, etc., which can improve the safety factor and convenience of use of the refrigerator on the basis of simple structure and low production cost.

[0064] The fresh-keeping device may further include a vacuum pump 5, and the vacuum pump 5 is connected to the fresh-keeping drawer 4 and the humidification air duct 2 in an air path. For example, the air inlet of the vacuum pump 5 may be connected to the air outlet 401 of the fresh-keeping drawer 4, the air outlet of the vacuum pump 5 may be connected to the humidification air duct 2 in an air path, and the end of the humidification air duct 2 away from the vacuum pump 5 may be connected to the air inlet 402 of the fresh-keeping drawer 4 in an air path. Thus, the vacuum pump 5 may be operated to extract the gas in the sealed environment in the fresh-keeping drawer 4 into the humidification air duct 2, and the air flow in the humidification air duct 2 may be circulated.

[0065] During the air flow circulation in the humidification duct 2, the carbon dioxide concentration in the fresh-keeping drawer 4 is increased by releasing the carbon dioxide in the humidification duct 2 through the humidification adsorption layer 3, thereby improving the preservation effect of the food in the fresh-keeping drawer 4 and preventing the fruits and vegetables in the fresh-keeping drawer 4 from accelerating their respiration and causing deterioration when the carbon dioxide concentration is too low.

[0066] An optional embodiment of the invention, referring to Figure 1-4As shown, a first connecting pipeline 6 is further provided between the vacuum pump 5 and the humidification air duct 2 .

[0067] In the embodiment of the present invention, the first connecting pipeline 6 is mainly used to connect the vacuum pump 5 with the humidification air duct 2. For example, one end of the first connecting pipeline 6 is connected to the air path of the air outlet of the vacuum pump 5, and the other end of the first connecting pipeline 6 is connected to the air path of the humidification air duct 2. In addition, the diameter of the first connecting pipeline 6 can be smaller than the diameter of the humidification air duct 2. Therefore, by expanding the diameter of the humidification air duct 2, the contact area between the humidification adsorption layer 3 and the air in the humidification air duct 2 can be expanded, and the carbon dioxide release efficiency of the humidification adsorption layer 3 can be improved. By reducing the diameter of the first connecting pipeline 6, the operating power of the vacuum pump 5 can be reduced, and the air flow rate in the fresh-keeping drawer 4 can be guaranteed.

[0068] An optional embodiment of the invention, referring to Figure 4 and Figure 6 As shown, the fresh-keeping device also includes a circulation fan 7, and the circulation fan 7 is respectively connected with the fresh-keeping drawer 4 and the humidification air duct 2 to form an air path, wherein the circulation fan 7 draws the gas in the humidification air duct 2 into the fresh-keeping drawer 4 when working.

[0069] In the embodiment of the present invention, the fresh-keeping device may further include a circulating fan 7, and the circulating fan 7 is respectively connected to the fresh-keeping drawer 4 and the humidification air duct 2 in an air path. For example, the air inlet of the circulating fan 7 may be connected to the humidification air duct 2 in an air path, and the air outlet of the circulating fan 7 may be connected to the air inlet 402 of the fresh-keeping drawer 4 in an air path. Thus, when the vacuum pump 5 is working, the gas in the sealed environment in the fresh-keeping drawer 4 is extracted into the humidification air duct 2. Then, the air in the humidification air duct 2 is sent into the fresh-keeping drawer 4 through the circulating fan 7, thereby realizing the airflow circulation in the fresh-keeping drawer 4.

[0070] During the air flow circulation in the humidification duct 2, the carbon dioxide concentration in the fresh-keeping drawer 4 is increased by releasing the carbon dioxide in the humidification duct 2 through the humidification adsorption layer 3, thereby improving the preservation effect of the food in the fresh-keeping drawer 4 and preventing the fruits and vegetables in the fresh-keeping drawer 4 from accelerating their respiration and causing deterioration when the carbon dioxide concentration is too low.

[0071] An optional embodiment of the invention, referring to Figure 1 , Figure 2 , Figure 4 , Figure 5 as well as Figure 6 As shown, a second connecting pipeline 8 is further provided between the circulation fan 7 and the humidification air duct 2 .

[0072] In the embodiment of the present invention, the second connecting pipeline 8 is mainly used to connect the circulation fan 7 with the humidification air duct 2. For example, one end of the first connecting pipeline 6 is connected to the air inlet air path of the humidification air duct 2, and the other end of the first connecting pipeline 6 is connected to the air inlet air path of the circulation fan 7.

[0073] Furthermore, the diameter of the second connecting pipeline 8 may be smaller than the diameter of the humidifying air duct 2, thereby expanding the contact area between the humidifying adsorption layer 3 and the air in the humidifying air duct 2 and improving the carbon dioxide release efficiency of the humidifying adsorption layer 3. By reducing the diameter of the second connecting pipeline 8, the operating power of the circulation fan 7 can be reduced and the air flow rate in the fresh-keeping drawer 4 can be guaranteed.

[0074] An optional embodiment of the invention, referring to Figure 1 and Figure 4 As shown, the first connecting pipeline 6 is in gas communication with one end of the humidifying air duct 2 , and the second connecting pipeline 8 is in gas communication with the other end of the humidifying air duct 2 .

[0075] In the embodiment of the present invention, in order to increase the increased concentration of carbon dioxide in a single airflow cycle, the first connecting pipeline 6 is connected to the air path of one end of the humidifying air duct 2. The second connecting pipeline 8 is connected to the air path of the other end of the humidifying air duct 2. That is to say, during one cycle of the gas in the fresh-keeping drawer 4, the gas can completely flow through the entire humidifying air duct 2. Therefore, in the process of flowing through the humidifying air duct 2, the humidifying adsorption layer 3 arranged on one side of the humidifying air duct 2 can continuously release carbon dioxide into the flowing gas, thereby maximizing the increased concentration of carbon dioxide in a single airflow cycle. Improve the regulation efficiency of the carbon dioxide concentration of the fresh-keeping device.

[0076] In an optional embodiment of the invention, when at least two fresh-keeping drawers 4 are provided, at least two of the fresh-keeping drawers 4 are connected by an air path.

[0077] In the embodiment of the present invention, the fresh-keeping drawer 4 may be provided in plurality. Those skilled in the art may determine the specific number of fresh-keeping drawers 4 according to actual design requirements or refrigerator capacity, and no further limitation is made here.

[0078] For example, the number of the fresh-keeping drawers 4 may be 2, 3, or 4. When at least two fresh-keeping drawers 4 are provided, an air path is formed between at least two of the fresh-keeping drawers 4. For example, when two fresh-keeping drawers 4 are provided, the air in the humidification air duct 2 enters the first fresh-keeping drawer 4 through the circulation fan 7, then enters the second fresh-keeping drawer 4, and finally is extracted into the humidification air duct 2 through the vacuum pump 5.

[0079] In summary, the embodiment of the present invention discloses a fresh-keeping device, which may include a refrigeration air duct 1, a humidification air duct 2, a dehumidification adsorption layer 3 and a fresh-keeping drawer 4. The dehumidification adsorption layer 3 is located between the refrigeration air duct 1 and the humidification air duct 2 to separate the air ducts, and the humidification air duct 2 is connected to the fresh-keeping drawer 4 through an air path. The dehumidification adsorption layer 3 absorbs carbon dioxide gas in the refrigeration air duct 1 located on the low humidity side, and releases carbon dioxide gas in the humidification air duct 2 located on the high humidity side, so that the carbon dioxide gas flows into the fresh-keeping drawer 4 to preserve food. Therefore, carbon dioxide gas can be adsorbed from the air in the refrigeration air duct 1 without obtaining it through chemical reactions, etc. On the basis of simple structure and low production cost, the safety factor and convenience of use of the refrigerator can be improved.

[0080] The embodiment of the present invention further discloses a refrigerator, wherein the refrigerator is a fresh-keeping device as described in any one of the above-mentioned embodiments of the invention.

[0081] In an embodiment of the present invention, the refrigerator includes a refrigerator body and a fresh-keeping device as described in any one of the above-mentioned embodiments of the invention, and the fresh-keeping device is arranged in the refrigerator body. For example, the fresh-keeping drawer 4 can be slidably connected or movably connected in the refrigerator body. The vacuum pump 5 and / or the circulating fan 7 are installed inside the refrigerator body. The refrigerator may include a refrigeration air duct 1, a humidification air duct 2, a dehumidification adsorption layer 3 and a fresh-keeping drawer 4. The dehumidification adsorption layer 3 is located between the refrigeration air duct 1 and the humidification air duct 2 to separate the air ducts, and the humidification air duct 2 is connected to the fresh-keeping drawer 4 through an air path.

[0082] The humidification adsorption layer 3 absorbs the carbon dioxide gas in the refrigeration air duct 1 at the low humidity side, and releases the carbon dioxide gas in the humidification air duct 2 at the high humidity side, so that the carbon dioxide gas flows into the fresh-keeping drawer 4 to preserve food. Therefore, the carbon dioxide gas can be adsorbed from the air in the refrigeration air duct 1 without obtaining it through chemical reactions, etc., and the safety factor and convenience of use of the refrigerator can be improved on the basis of simple structure and low production cost.

[0083] An optional embodiment of the invention, referring to Figure 6As shown, the refrigerator may further include a carbon dioxide sensor 9 , which is disposed in the fresh-keeping drawer 4 to detect the carbon dioxide concentration in the fresh-keeping drawer 4 .

[0084] In an embodiment of the present invention, the refrigerator may further include a carbon dioxide sensor 9, which is installed in the fresh-keeping drawer 4, so that the carbon dioxide concentration in the fresh-keeping drawer 4 can be detected, and based on the detected carbon dioxide concentration, it can be determined whether it is necessary to circulate the air flow in the humidification duct 2 to increase the carbon dioxide concentration in the fresh-keeping drawer 4.

[0085] An optional embodiment of the invention, referring to Figure 7 As shown, the refrigerator may further include a controller 10, the carbon dioxide sensor 9 is electrically connected to the controller 10, and the vacuum pump 5 of the preservation device and the circulating fan 7 of the preservation device are electrically connected to the controller 10 respectively. The controller 10 adjusts the working states of the vacuum pump 5 and the circulating fan 7 according to the carbon dioxide concentration detected by the carbon dioxide sensor 9.

[0086] In the embodiment of the present invention, the carbon dioxide sensor 9, the vacuum pump 5 and the circulating fan 7 can be electrically connected to the controller 10 respectively. Therefore, the carbon dioxide sensor 9 can transmit the detected carbon dioxide concentration in the fresh-keeping drawer 4 to the controller 10, and the controller 10 adjusts the working state of the vacuum pump 5 and the circulating fan 7 according to the carbon dioxide concentration. Among them, adjusting the working state of the vacuum pump 5 and the circulating fan 7 can include: when it is determined that the carbon dioxide concentration is too low, for example, less than or equal to the first concentration threshold, starting the vacuum pump 5 and the circulating fan 7 to circulate the air flow between the gas in the fresh-keeping drawer 4 and the humidification air duct 2.

[0087] When it is determined that the carbon dioxide concentration is too high, for example, greater than a second concentration threshold, the vacuum pump 5 and the circulation fan 7 are stopped, and the air circulation between the gas in the fresh-keeping drawer 4 and the humidification air duct 2 is stopped.

[0088] Reference Figure 8 As shown, the embodiment of the present invention further discloses a control method for a refrigerator, the refrigerator includes the refrigerator as described in the above embodiment of the invention, and the control method is applied to the controller 10, including:

[0089] S801. Obtain the carbon dioxide concentration value detected by the carbon dioxide sensor 9.

[0090] S802. When the carbon dioxide concentration value does not meet the set concentration condition, start the vacuum pump 5 to send the gas in the fresh-keeping drawer 4 into the humidification duct 2. The humidifying adsorption layer 3 absorbs the carbon dioxide gas in the refrigeration duct 1 located on the low humidity side, and releases the carbon dioxide gas in the humidification duct 2 located on the high humidity side to increase the carbon dioxide concentration of the gas in the humidification duct 2.

[0091] S803 , starting the circulation fan 7 to send the gas in the humidification air duct 2 into the fresh-keeping drawer 4 to increase the carbon dioxide concentration in the fresh-keeping drawer 4 .

[0092] S804. When it is determined that the carbon dioxide concentration value satisfies the set concentration condition, stop the vacuum pump 5 and the circulation fan 7.

[0093] In an embodiment of the present invention, the refrigerator may further include a carbon dioxide sensor 9, which is installed in the fresh-keeping drawer 4, so that the carbon dioxide concentration in the fresh-keeping drawer 4 can be detected, and based on the detected carbon dioxide concentration, it can be determined whether it is necessary to circulate the air flow in the humidification duct 2 to increase the carbon dioxide concentration in the fresh-keeping drawer 4.

[0094] The set concentration condition may include: the carbon dioxide concentration is greater than a first concentration threshold, and the carbon dioxide concentration is less than or equal to a second concentration threshold.

[0095] In the case where the carbon dioxide concentration does not meet the set concentration condition, it is determined that the current carbon dioxide concentration in the fresh-keeping drawer 4 is too low, and the food preservation effect is poor. Then, the vacuum pump 5 and the circulating fan 7 are started by the controller 10 to circulate the air flow between the gas in the fresh-keeping drawer 4 and the humidification air duct 2. The carbon dioxide gas in the refrigeration air duct 1 located on the low humidity side is absorbed by the humidification adsorption layer 3, and the carbon dioxide gas is released in the humidification air duct 2 located on the high humidity side. In this way, the carbon dioxide concentration in the humidification air duct 2 can be increased, and the carbon dioxide concentration in the fresh-keeping drawer 4 can be increased.

[0096] When the carbon dioxide concentration meets the set concentration condition, it is determined that the current carbon dioxide concentration in the fresh-keeping drawer 4 can achieve the optimal fresh-keeping effect of the food. For example, when the carbon dioxide concentration is greater than the second concentration threshold, the vacuum pump 5 and the circulation fan 7 are stopped, thereby stopping the air circulation between the gas in the fresh-keeping drawer 4 and the humidification air duct 2.

[0097] In some optional embodiments of the invention, the control method may further include:

[0098] In response to a user's editing operation on a concentration control, obtaining a set concentration value;

[0099] The set concentration condition is updated according to the set concentration value.

[0100] In an embodiment of the present invention, the refrigerator may further provide an interactive interface, in which a concentration control is provided, and the concentration control is used to adjust the concentration of carbon dioxide in the fresh-keeping drawer 4. Thus, based on the user's editing operation on the concentration control, the set concentration value set by the user is obtained. After the set concentration value is obtained, the set concentration condition may also be updated according to the set concentration value. For example, the set concentration condition may also be: the carbon dioxide concentration is greater than or equal to the set concentration threshold. Thus, the set concentration value is used as the updated set concentration threshold.

[0101] When the carbon dioxide concentration is less than the set concentration threshold, it is determined that the set concentration condition is not met. It is determined that the current carbon dioxide concentration in the fresh-keeping drawer 4 is too low, and the food preservation effect is poor. The vacuum pump 5 and the circulation fan 7 are started by the controller 10 to circulate the air between the gas in the fresh-keeping drawer 4 and the humidification air duct 2.

[0102] The carbon dioxide gas in the refrigeration air duct 1 at the low humidity side is absorbed by the humidification adsorption layer 3, and the carbon dioxide gas is released in the humidification air duct 2 at the high humidity side. In this way, the carbon dioxide concentration in the humidification air duct 2 can be increased, and the carbon dioxide concentration in the fresh-keeping drawer 4 can be increased.

[0103] When the carbon dioxide concentration is greater than or equal to the set concentration threshold, it is determined that the set concentration condition is met, and it is determined that the current carbon dioxide concentration in the fresh-keeping drawer 4 can achieve the optimal fresh-keeping effect of the food. The vacuum pump 5 and the circulation fan 7 are stopped, thereby stopping the air circulation between the gas in the fresh-keeping drawer 4 and the humidification air duct 2.

[0104] In some other optional embodiments, the refrigerator may further include a category control provided in the interactive interface, and in response to the user's clicking operation on the category control, the category of fruits and vegetables stored in the fresh-keeping drawer 4 is determined. Thus, a set concentration condition matching the category of fruits and vegetables may be determined.

[0105] For example, the types of fruits and vegetables may include but are not limited to: leafy vegetables, stem vegetables, fruit vegetables, fruits, and fungi, etc. The optimal carbon dioxide concentration required for the preservation of different types of fruits and vegetables varies, so the optimal carbon dioxide concentration range can be matched based on the different types of fruits and vegetables stored in the fresh-keeping drawer 4, as shown in the following Table 1:

[0106] Table 1 Example of matching fruit and vegetable types with carbon dioxide concentration

[0107]

[0108] In the above table 1, the optimal carbon dioxide concentration for preserving leafy vegetables is 1%-8%; the optimal carbon dioxide concentration for preserving stem vegetables is 1%-5%; the optimal carbon dioxide concentration for preserving fruits and vegetables is 2%-8%; the optimal carbon dioxide concentration for preserving fruits is 2%-6%; the optimal carbon dioxide concentration for preserving fungi is 4%-6%. Therefore, when the fresh-keeping drawer 4 is identified to have one of the above-mentioned types of fruits and vegetables, the set concentration condition matching the type of fruits and vegetables can be determined. For example, when there are only fungi in the fresh-keeping drawer 4, the lower limit of the carbon dioxide concentration associated with the fungi, 4%, can be used as the first concentration threshold in the set concentration condition, and the upper limit of the carbon dioxide concentration associated with the fungi, 6%, can be used as the second concentration threshold in the set concentration condition.

[0109] When determining that there are at least two types of fruits and vegetables in the fresh-keeping drawer 4, the lower limit value of the carbon dioxide concentration and the upper limit value of the carbon dioxide concentration that match each type of fruit and vegetable are matched respectively. Therefore, the maximum lower limit value of the carbon dioxide concentration can be used as the first concentration threshold value in the set concentration condition. And the minimum upper limit value of the carbon dioxide concentration is used as the second concentration threshold value in the set concentration condition. For example, when leafy vegetables and fruits are placed in the fresh-keeping drawer 4 at the same time, the optimal carbon dioxide concentration for preserving leafy vegetables is 1%-8%, and the optimal carbon dioxide concentration for preserving fruits is 2%-6%. Then the first concentration threshold value in the set concentration condition is determined to be 2%, and the second concentration threshold value is determined to be 6%.

[0110] The embodiment of the present invention discloses a control method for a refrigerator, which may include first obtaining the carbon dioxide concentration value detected by the carbon dioxide sensor 9, and when the carbon dioxide concentration value does not meet the set concentration condition, starting the vacuum pump 5 to send the gas in the fresh-keeping drawer 4 into the humidification air duct 2, and the humidification adsorption layer 3 absorbs the carbon dioxide gas in the refrigeration air duct 1 located on the low humidity side, and releases the carbon dioxide gas in the humidification air duct 2 located on the high humidity side to increase the carbon dioxide concentration of the gas in the humidification air duct 2. Then start the circulation fan 7 to send the gas in the humidification air duct 2 into the fresh-keeping drawer 4 to increase the carbon dioxide concentration in the fresh-keeping drawer 4. Finally, when it is determined that the carbon dioxide concentration value meets the set concentration condition, stop the vacuum pump 5 and the circulation fan 7. Therefore, when the carbon dioxide concentration in the fresh-keeping drawer 4 needs to be adjusted, the vacuum pump 5 and the circulation fan 7 can be started, and carbon dioxide gas can be adsorbed from the refrigeration air duct 1 to the humidification air duct 2. Therefore, there is no need to obtain it through chemical reactions, etc., and the safety factor and convenience of using the refrigerator can be improved on the basis of simple structure and low production cost.

[0111] 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.

[0112] It is easy for a person skilled in the art to think that any combination of the above embodiments is feasible, so any combination of the above embodiments is an implementation scheme of the present invention. However, due to space limitations, this specification will not describe them in detail here.

[0113] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0114] Similarly, it should be understood that in order to streamline the present invention and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof.

[0115] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

Claims

1. A fresh-keeping device, characterized in that: The fresh-keeping device comprises a refrigeration air duct (1), a humidification air duct (2), a dehumidification adsorption layer (3) and a fresh-keeping drawer (4); the dehumidification adsorption layer (3) is located between the refrigeration air duct (1) and the humidification air duct (2) to separate the air ducts, and the humidification air duct (2) and the fresh-keeping drawer (4) are connected by an air path; The humidifying adsorption layer (3) absorbs carbon dioxide gas in the refrigeration air duct (1) located on the low humidity side, and releases carbon dioxide gas in the humidification air duct (2) located on the high humidity side, so that the carbon dioxide gas flows into the fresh-keeping drawer (4) to preserve food.

2. The fresh-keeping device according to claim 1, characterized in that: The humidifying air duct (2) is configured as a curved structure that matches the shape of the refrigerating air duct (1).

3. The fresh-keeping device according to claim 2, characterized in that: The cross-sectional shape of the humidification air duct (2) includes one of the following: U-shaped and wavy.

4. The fresh-keeping device according to claim 1, characterized in that: The wettable adsorption layer (3) is made of strong base ion exchange resin.

5. The fresh-keeping device according to claim 2, characterized in that: The fresh-keeping device further comprises a vacuum pump (5), wherein the vacuum pump (5) is connected to the fresh-keeping drawer (4) and the humidifying air duct (2) by air paths respectively; wherein when the vacuum pump (5) is in operation, the gas in the fresh-keeping drawer (4) is extracted into the humidifying air duct (2).

6. The fresh-keeping device according to claim 5, characterized in that: A first connecting pipeline (6) is also provided between the vacuum pump (5) and the humidification air duct (2).

7. The fresh-keeping device according to claim 6, characterized in that: The fresh-keeping device further comprises a circulation fan (7), wherein the circulation fan (7) is connected to the fresh-keeping drawer (4) and the humidification air duct (2) in an air path, respectively, wherein the circulation fan (7) draws the gas in the humidification air duct (2) into the fresh-keeping drawer (4) when in operation.

8. The fresh-keeping device according to claim 7, characterized in that: A second connecting pipeline (8) is also provided between the circulating fan (7) and the humidifying air duct (2).

9. The fresh-keeping device according to claim 8, characterized in that: The first connecting pipeline (6) is in gas communication with one end of the humidifying air duct (2), and the second connecting pipeline (8) is in gas communication with the other end of the humidifying air duct (2).

10. The fresh-keeping device according to claim 1, characterized in that: When at least two fresh-keeping drawers (4) are provided, at least two of the fresh-keeping drawers (4) are connected by an air path.

11. A refrigerator, comprising the fresh-keeping device according to any one of claims 1 to 10.

12. The refrigerator according to claim 11, characterized in that: The refrigerator further comprises a carbon dioxide sensor (9), wherein the carbon dioxide sensor (9) is arranged in the fresh-keeping drawer (4) to detect the carbon dioxide concentration in the fresh-keeping drawer (4).

13. The refrigerator according to claim 12, characterized in that: The refrigerator further comprises a controller (10), the carbon dioxide sensor (9) being electrically connected to the controller (10), and the vacuum pump (5) of the fresh-keeping device and the circulating fan (7) of the fresh-keeping device being electrically connected to the controller (10), respectively. The controller (10) adjusts the working states of the vacuum pump (5) and the circulating fan (7) according to the carbon dioxide concentration detected by the carbon dioxide sensor (9).

14. A method for controlling a refrigerator, characterized in that: The refrigerator comprises the refrigerator according to claim 13, and the control method is applied to the controller (10), comprising: obtaining a carbon dioxide concentration value detected by the carbon dioxide sensor (9); When the carbon dioxide concentration value does not meet the set concentration condition, the vacuum pump (5) is started to send the gas in the fresh-keeping drawer (4) into the humidification air duct (2), and the humidification adsorption layer (3) absorbs the carbon dioxide gas in the refrigeration air duct (1) located on the low humidity side, and releases the carbon dioxide gas in the humidification air duct (2) located on the high humidity side, so as to increase the carbon dioxide concentration of the gas in the humidification air duct (2); Starting the circulating fan (7) to send the gas in the humidifying air duct (2) into the fresh-keeping drawer (4) to increase the carbon dioxide concentration in the fresh-keeping drawer (4); When it is determined that the carbon dioxide concentration value satisfies the set concentration condition, the vacuum pump (5) and the circulation fan (7) are stopped.

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