Fresh-keeping device and refrigerator

Abstract

The utility model discloses a fresh-keeping device and a 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 utility model relates to the technical field of electrical appliances, in particular to a fresh-keeping device and a refrigerator. BACKGROUND

[0002] A certain concentration of carbon dioxide gas, such as carbon dioxide gas with a concentration greater than 15%, can effectively inhibit the growth of bacteria and the respiration of fruits and vegetables, thereby prolonging the shelf life of food. By increasing the concentration of carbon dioxide in the environment, the food preservation scheme is suitable for the food preservation scene of the refrigerator.

[0003] In the process of food preservation by carbon dioxide, the most important thing is to obtain high-concentration carbon dioxide. The current common method is to generate carbon dioxide through chemical reaction (acid and carbonate react to produce carbon dioxide). However, chemical reaction is prone to material leakage, and requires replacement of consumables. Thus, the safety factor and convenience of the refrigerator are reduced. UTILITY MODEL CONTENTS

[0004] In view of the problem that the high-concentration carbon dioxide generated by chemical reaction reduces the safety factor and convenience of the refrigerator, the utility model is proposed to provide a fresh-keeping device and a refrigerator that overcome the above problems or at least partially solve the above problems.

[0005] Based on the first aspect of the utility model, a fresh-keeping device is provided, which comprises a refrigeration air duct, a humidification air duct, a humidity-changing adsorption layer, and a fresh-keeping drawer. The humidity-changing adsorption layer is located between the refrigeration air duct and the humidification air duct to separate the air ducts, and the humidification air duct and the fresh-keeping drawer form a gas path communication.

[0006] The humidity-changing adsorption layer absorbs carbon dioxide gas in the refrigeration air duct on the low-humidity side and releases carbon dioxide gas in the humidification air duct on the high-humidity side, so that the carbon dioxide gas flows into the fresh-keeping drawer for food preservation.

[0007] An optional utility model content is that the humidification air duct is arranged in a curved structure that is adapted to the shape of the refrigeration air duct.

[0008] An optional utility model content is that the cross-sectional shape of the humidification air duct includes one of the following: U-shaped and wave-shaped.

[0009] An optional utility model content is that the humidity-changing adsorption layer is made of strong alkali ion exchange resin.

[0010] Optionally, the fresh-keeping device further comprises a vacuum pump, the vacuum pump is in communication with the fresh-keeping drawer and the humidifying air duct respectively.

[0011] Optionally, the fresh-keeping device further comprises a vacuum pump, the vacuum pump is in communication with the fresh-keeping drawer and the humidifying air duct respectively.

[0012] Optionally, the fresh-keeping device further comprises a circulating fan, the circulating fan is in communication with the fresh-keeping drawer and the humidifying air duct respectively, and the circulating fan is used for extracting the gas in the humidifying air duct into the fresh-keeping drawer.

[0013] Optionally, the fresh-keeping device further comprises a circulating fan, the circulating fan is in communication with the fresh-keeping drawer and the humidifying air duct respectively, and the circulating fan is used for extracting the gas in the humidifying air duct into the fresh-keeping drawer.

[0014] Optionally, the fresh-keeping device further comprises a circulating fan, the circulating fan is in communication with the fresh-keeping drawer and the humidifying air duct respectively, and the circulating fan is used for extracting the gas in the humidifying air duct into the fresh-keeping drawer.

[0015] Optionally, the fresh-keeping device further comprises a circulating fan, the circulating fan is in communication with the fresh-keeping drawer and the humidifying air duct respectively, and the circulating fan is used for extracting the gas in the humidifying air duct into the fresh-keeping drawer.

[0016] Optionally, the fresh-keeping device further comprises a circulating fan, the circulating fan is in communication with the fresh-keeping drawer and the humidifying air duct respectively, and the circulating fan is used for extracting the gas in the humidifying air duct into the fresh-keeping drawer.

[0017] Optionally, the fresh-keeping device further comprises a circulating fan, the circulating fan is in communication with the fresh-keeping drawer and the humidifying air duct respectively, and the circulating fan is used for extracting the gas in the humidifying air duct into the fresh-keeping drawer.

[0018] Optionally, the fresh-keeping device further comprises a circulating fan, the circulating fan is in communication with the fresh-keeping drawer and the humidifying air duct respectively, and the circulating fan is used for extracting the gas in the humidifying air duct into the fresh-keeping drawer.

[0019] Compared with the prior art, the utility model discloses refrigeration air duct, humidification air duct, variable humidity adsorption layer and fresh -keeping drawer, the variable humidity adsorption layer is located between the refrigeration air duct with humidification air duct, to carry out air duct separation, and humidification air duct with the fresh -keeping drawer forms the air path intercommunication. The variable humidity adsorption layer absorbs carbon dioxide gas in the refrigeration air duct of low humidity side, and releases carbon dioxide gas in the humidification air duct of high humidity side, to make carbon dioxide gas flow into the fresh -keeping drawer and carry out food preservation. Thus can adsorb carbon dioxide gas from the air of the refrigeration air duct, need not obtain through chemical reaction etc., on the basis of simple structure, low in production cost, can improve the use safety factor and use convenient degree of refrigerator.

[0020] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, can be implemented according to the content of the specification, and in order to let the above and other purposes, characteristics and advantages of the utility model can be more obvious and easy to understand, the following specific embodiment of the utility model is described. BRIEF DESCRIPTION OF DRAWINGS

[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present utility model. Furthermore, the same reference numerals are intended to identify the same components throughout the various figures.

[0022] In the drawings:

[0023] Figure 1 is a disassembled structural schematic view of a fresh -keeping device provided by the utility model embodiment;

[0024] Figure 2 is another fresh -keeping device three -dimensional structure schematic view provided by the utility model embodiment;

[0025] Figure 3 is Figure 2 the structure enlarged schematic view of A in;

[0026] Figure 4 is the first structure schematic view of a fresh -keeping device provided by the utility model embodiment;

[0027] Figure 5 is the second structure schematic view of a fresh -keeping device provided by the utility model embodiment;

[0028] Figure 6 is the structure sectional view schematic view of a fresh -keeping device provided by the utility model embodiment;

[0029] Figure 7The utility model embodiment provides a kind of electric connection structure block diagram of the controller of refrigerator;

[0030] Figure 8 The utility model embodiment provides a kind of step flow chart schematic diagram of the control method of refrigerator;

[0031] Reference signs: 1, refrigeration air duct;101, refrigeration air port;2, humidification air duct;3, humidity adsorption layer;4, fresh-keeping drawer;401, air outlet;402, air inlet;5, vacuum pump;6, first connecting pipeline;7, circulating fan;8, second connecting pipeline;9, carbon dioxide sensor;10, controller. DETAILED DESCRIPTION

[0032] Exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. While exemplary embodiments of the present application are illustrated, it is to be understood that the application is not limited to the embodiments described herein, but can be practiced with variation of them without departing from the scope of the present application. Rather, these embodiments are included to more fully and completely convey the scope of the application to those skilled in the art. Thus, the present application is not intended to be limited to the embodiments described herein, but is to be accorded the full scope that can be claimed.

[0033] Carbon dioxide gas of certain concentration, such as carbon dioxide gas with a concentration greater than 15%, can well inhibit the growth of bacteria and the respiration of fruits and vegetables, thereby prolonging the preservation period of food. By increasing the concentration of carbon dioxide in the environment, the food preservation scheme is suitable for the food preservation scene of the refrigerator.

[0034] In the process of food preservation by carbon dioxide, the most important thing is to obtain high-concentration carbon dioxide, and the current commonly used obtaining method is through chemical reaction (carbon dioxide is generated by chemical reaction of acid and carbonate). However, chemical reaction is prone to material leakage, and consumables need to be replaced. Thus, the use safety factor and use convenience of the refrigerator are reduced.

[0035] Based on the above technical problems, the utility model embodiment is provided, and the utility model embodiment can include a refrigeration air duct 1, a humidification air duct 2, a humidity adsorption layer 3 and a fresh-keeping drawer 4. The humidity 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 form air path communication. The humidity 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 carbon dioxide gas flows into the fresh-keeping drawer 4 for food preservation. Thus, carbon dioxide gas can be adsorbed from the air in the refrigeration air duct 1, without being obtained by chemical reaction, etc. On the basis of simple structure and low production cost, the use safety factor and use convenience of the refrigerator can be improved.

[0036] Referring to Figures 1-6 The utility model embodiment provides a kind of fresh-keeping device, the fresh-keeping device can include refrigeration air duct 1, humidification air duct 2, variable humidity adsorption layer 3 and fresh-keeping drawer 4, the variable humidity adsorption layer 3 is between the refrigeration air duct 1 and the humidification air duct 2, to carry out air duct separation, and the humidification air duct 2 and the fresh-keeping drawer 4 form gas path communication.The variable humidity adsorption layer 3 absorbs carbon dioxide gas in the refrigeration air duct 1 located in low humidity side, and releases carbon dioxide gas in the humidification air duct 2 located in high humidity side, to make carbon dioxide gas flow into the fresh-keeping drawer 4 and carry out food preservation.

[0037] In the utility model embodiment, the fresh-keeping device can include refrigeration air duct 1, humidification air duct 2, variable humidity adsorption layer 3 and fresh-keeping drawer 4.The refrigeration air duct 1 is used to provide cooling air to the refrigerator compartment.For example, outdoor air generates cooling air through the refrigeration system of the refrigerator, the refrigeration air duct 1 is in gas path communication with the refrigeration system, and cold air is introduced into the refrigeration air duct 1, and a refrigeration air outlet 101 is formed on the refrigeration air duct 1, so that cooling air is blown into the refrigerator compartment through the refrigeration air outlet 101.For example, the humidity of air in the refrigeration air duct 1 is usually between 40% and 60%.

[0038] The variable humidity adsorption layer 3 is made of variable humidity adsorption material, which is arranged between the refrigeration air duct 1 and the humidification air duct 2, so as to separate the refrigeration air duct 1 and the humidification air duct 2.In other words, the refrigeration air duct 1 and the humidification air duct 2 are divided by the variable humidity adsorption layer 3, so that carbon dioxide gas in the refrigeration air duct 1 located in low humidity side is absorbed by the variable humidity adsorption layer 3, and carbon dioxide gas is released in the humidification air duct 2 located in high humidity side without affecting the gas path circulation of the refrigeration air duct 1 and the gas path circulation of the humidification air duct 2.Thereby, the carbon dioxide concentration of the humidification air duct 2 and the carbon dioxide concentration in the fresh-keeping drawer 4 can be improved.

[0039] The variable humidity adsorption material in the variable humidity adsorption layer 3 can use the evaporation free energy of water as the energy source for carbon dioxide regeneration in normal temperature environment.The adsorption process and the desorption process of carbon dioxide gas can be realized by changing the water vapor in the environment.For example, in a dry state, the basic groups on the surface of the variable humidity adsorption material can adsorb carbon dioxide in the air, and when the humidity in the environment increases, the variable humidity adsorption material releases carbon dioxide, and the variable humidity adsorption material can regain the adsorption capacity of carbon dioxide by drying and regeneration.

[0040] Since the preservation drawer 4 is typically used for preserving vegetables and fruits, and these fruits and vegetables themselves emit a large amount of water vapor, the humidity inside the sealed preservation drawer 4 can reach over 90%, typically between 90% and 95%. Therefore, the humidification duct 2, which is connected to the airflow of the preservation drawer 4, is a high-humidity environment. Compared to the variable humidity adsorption layer 3, the side of the variable humidity adsorption layer 3 closest to the humidification duct 2 is the high-humidity side, while the side of the variable humidity adsorption layer 3 closest to the cooling duct 1 is the low-humidity side. Thus, the variable humidity adsorption layer 3 can repeatedly adsorb carbon dioxide from the cooling duct 1 and release the adsorbed carbon dioxide into the humidification duct 2.

[0041] This allows the refrigerator to adsorb carbon dioxide gas from the outside air (which can also be understood as the air flowing in the cooling duct 1) without the need for chemical reactions. Based on its simple structure and low production cost, this improves the safety and ease of use of the refrigerator.

[0042] An optional utility model embodiment, referring to... Figure 1 , Figure 2 as well as Figure 4 As shown, the humidifying air duct 2 is configured as a curved structure that adapts to the shape of the cooling air duct 1.

[0043] In this embodiment of the invention, the humidifying air duct 2 is configured as a curved structure adapted to the shape of the cooling air duct 1, thereby further increasing the extension length of the variable moisture adsorption layer 3 between the two air ducts. Alternatively, it increases the contact area between the variable moisture adsorption layer 3 and the humidifying air duct 2, and simultaneously increases the contact area between the variable moisture adsorption layer 3 and the cooling air duct 1. This improves the cumulative absorption efficiency of carbon dioxide from the flowing air in the cooling air duct 1 by the variable moisture adsorption layer 3, and also improves the release efficiency of carbon dioxide from the variable moisture adsorption layer 3 in the humidifying air duct 2.

[0044] An optional utility model embodiment, referring to... Figure 1 , Figure 2 as well as Figure 4 As shown, the cross-sectional shape of the humidification duct 2 includes one of the following: U-shaped and wavy.

[0045] In this embodiment of the invention, the cross-sectional shape of the humidifying air duct 2 can be U-shaped or wavy. This increases the extension length of the humidifying air duct 2 in the refrigerator's crisper compartment and further extends the extension length of the moisture-adsorbing layer 3 between the two air ducts. The U-shaped or wavy design facilitates processing and allows air to flow through the two air ducts with less resistance.

[0046] An optional utility model embodiment, the fresh-keeping device can include refrigeration air duct 1, humidification air duct 2, humidity adsorption layer 3 and fresh-keeping drawer 4, the humidity adsorption layer 3 is located between the refrigeration air duct 1 and the humidification air duct 2 to carry out air duct separation, and the humidification air duct 2 and the fresh-keeping drawer 4 form gas path communication.The humidity 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 carbon dioxide gas flows into the fresh-keeping drawer 4 for food preservation.

[0047] In the utility model embodiment, the fresh-keeping device can include refrigeration air duct 1, humidification air duct 2, humidity adsorption layer 3 and fresh-keeping drawer 4.The refrigeration air duct 1 is used to provide cooling air to the refrigeration chamber of the refrigerator.For example, outdoor air generates cooling air through the refrigeration system of the refrigerator, the refrigeration air duct 1 is in gas path communication with the refrigeration system, and cold air is introduced into the refrigeration air duct 1, and a refrigeration air outlet 101 is formed on the refrigeration air duct 1, so that cooling air is blown into the refrigeration chamber of the refrigerator through the refrigeration air outlet 101.

[0048] The humidity adsorption layer 3 is made of humidity adsorption material, which is arranged between the refrigeration air duct 1 and the humidification air duct 2 to separate the refrigeration air duct 1 and the humidification air duct 2.In other words, the refrigeration air duct 1 and the humidification air duct 2 are divided by the humidity adsorption layer 3, so that carbon dioxide gas in the refrigeration air duct 1 located at the low humidity side is absorbed by the humidity adsorption layer 3, and carbon dioxide gas is released in the humidification air duct 2 located at the high humidity side without affecting the gas path circulation of the refrigeration air duct 1 and the gas path circulation of the humidification air duct 2.Thereby, the carbon dioxide concentration of the humidification air duct 2 and the carbon dioxide concentration in the fresh-keeping drawer 4 can be improved.

[0049] The humidity adsorption material in the humidity adsorption layer 3 can use the evaporation free energy of water as the energy source for carbon dioxide regeneration in a normal temperature environment.The adsorption process of carbon dioxide gas and the desorption process of carbon dioxide can be realized by changing the water vapor in the environment.For example, in a dry state, the basic groups on the surface of the humidity adsorption material can adsorb carbon dioxide in the air, and when the humidity in the environment increases, the humidity adsorption material releases carbon dioxide, and the humidity adsorption material can regain the adsorption capacity of carbon dioxide by drying regeneration.

[0050] Since the fresh-keeping drawer 4 is generally used for fresh-keeping of vegetables and fruits, and the vegetables and fruits themselves can emit a large amount of water vapor, so that the humidity in the fresh-keeping drawer 4 in a sealed environment can reach more than 90%, for example, generally between 90%-95%, so that the humidifying air duct 2 in communication with the fresh-keeping drawer 4 is a high-humidity environment. Relative to the humidity-changing adsorption layer 3, the side of the humidity-changing adsorption layer 3 close to the humidifying air duct 2 is a high-humidity side, and the side of the humidity-changing adsorption layer 3 close to the refrigerating air duct 1 is a low-humidity side. Thus, the humidity-changing adsorption layer 3 can repeatedly adsorb carbon dioxide in the refrigerating air duct 1 and release the adsorbed carbon dioxide into the humidifying air duct 2.

[0051] The humidity-changing adsorption layer 3 is made of strong base ion exchange resin. The strong base ion exchange resin refers to ion exchange resin with strong basic groups. Ion exchange resin refers to a high molecular compound with functional groups (active groups with exchangeable ions). For example, the strong basic groups can include but are not limited to quaternary ammonium groups and the like. In a dry state, the basic groups on the surface of the humidity-changing adsorption material can adsorb carbon dioxide in the air, and when the humidity in the environment increases, the humidity-changing adsorption material releases carbon dioxide, and the humidified humidity-changing adsorption material can regain the adsorption capacity of carbon dioxide through drying regeneration.

[0052] In some embodiments, the humidity-changing adsorption layer 3 can include a skeleton and a humidity-changing adsorption film arranged on the skeleton, and the humidity-changing adsorption film is made of strong base ion exchange resin. The skeleton can be made of polystyrene and the like. Thus, carbon dioxide gas can be adsorbed from external air (which can also be understood as air flowing in the refrigerating air duct 1), without the need for chemical reaction or the like, on the basis of simple structure and low production cost, the use safety factor and use convenience of the refrigerator can be improved.

[0053] An alternative utility model embodiment, with reference to Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 6As shown, the fresh-keeping device comprises a refrigeration air duct 1, a humidification air duct 2, a humidity-variable adsorption layer 3, a fresh-keeping drawer 4, and a vacuum pump 5. The humidity-variable 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 in air path communication with the fresh-keeping drawer 4. The humidity-variable adsorption layer 3 absorbs 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 for food preservation. The vacuum pump 5 is in air path communication with the fresh-keeping drawer 4 and the humidification air duct 2, respectively. When the vacuum pump 5 works, the gas in the fresh-keeping drawer 4 is extracted into the humidification air duct 2.

[0054] In the embodiment of the utility model, the refrigeration air duct 1 is used to provide cooling air to the refrigeration chamber of the refrigerator. For example, outdoor air passes through the refrigeration system of the refrigerator to generate cooling air, the refrigeration air duct 1 is in air path communication with the refrigeration system, and cold air is introduced into the refrigeration air duct 1. A refrigeration air port 101 is formed on the refrigeration air duct 1, so that cooling air is blown into the refrigeration chamber of the refrigerator through the refrigeration air port 101.

[0055] The humidity-variable adsorption layer 3 is made of humidity-variable adsorption material and is arranged between the refrigeration air duct 1 and the humidification air duct 2 to separate the refrigeration air duct 1 and the humidification air duct 2. In other words, the refrigeration air duct 1 and the humidification air duct 2 are divided by the humidity-variable adsorption layer 3, so that the carbon dioxide gas in the refrigeration air duct 1 at the low humidity side is absorbed by the humidity-variable adsorption layer 3, and the carbon dioxide gas is released in the humidification air duct 2 at the high humidity side without affecting the air path circulation of the refrigeration air duct 1 and the humidification air duct 2. Therefore, the carbon dioxide concentration of the humidification air duct 2 and the carbon dioxide concentration in the fresh-keeping drawer 4 can be improved.

[0056] The humidity-variable adsorption material in the humidity-variable adsorption layer 3 can use the evaporation free energy of water as the energy source for carbon dioxide regeneration in a normal temperature environment. By changing the water vapor in the environment, the adsorption process of carbon dioxide gas and the desorption process of carbon dioxide can be realized. For example, in a dry state, the basic groups on the surface of the humidity-variable adsorption material can adsorb carbon dioxide in the air. When the humidity in the environment increases, the humidity-variable adsorption material releases carbon dioxide. The humidity-variable adsorption material can regain the adsorption capacity of carbon dioxide by drying and regeneration.

[0057] Since the fresh-keeping drawer 4 is generally used for fresh-keeping of vegetables and fruits, and the vegetables and fruits 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%-95%, so that the humidifying air duct 2 in communication with the air path of the fresh-keeping drawer 4 is a high-humidity environment. Relative to the humidity-changing adsorption layer 3, the side of the humidity-changing adsorption layer 3 close to the humidifying air duct 2 is a high-humidity side, and the side of the humidity-changing adsorption layer 3 close to the refrigerating air duct 1 is a low-humidity side. Thus, the humidity-changing adsorption layer 3 can repeatedly adsorb carbon dioxide in the refrigerating air duct 1 and release the adsorbed carbon dioxide into the humidifying air duct 2.

[0058] Thus, carbon dioxide gas can be adsorbed from external air (which can also be understood as air flowing in the refrigerating air duct 1), without the need for chemical reactions and the like, and on the basis of simple structure and low production cost, the use safety factor and use convenience of the refrigerator can be improved.

[0059] The fresh-keeping device can further include a vacuum pump 5 in air path communication with the fresh-keeping drawer 4 and the humidifying air duct 2, respectively. For example, the air inlet of the vacuum pump 5 can be in air path communication with the air outlet 401 of the fresh-keeping drawer 4, the air outlet of the vacuum pump 5 can be in air path communication with the humidifying air duct 2, and the end of the humidifying air duct 2 away from the vacuum pump 5 can be in air path communication with the air inlet 402 of the fresh-keeping drawer 4. Thus, the vacuum pump 5 can work to extract the gas in the sealed environment of the fresh-keeping drawer 4 into the humidifying air duct 2 for air circulation in the humidifying air duct 2.

[0060] During air circulation in the humidifying air duct 2, the release of carbon dioxide in the humidifying air duct 2 by the humidity-changing adsorption layer 3 can increase the concentration of carbon dioxide in the fresh-keeping drawer 4, thereby improving the fresh-keeping effect of food materials in the fresh-keeping drawer 4 and preventing vegetables and fruits in the fresh-keeping drawer 4 from accelerating respiration and deteriorating due to too low carbon dioxide concentration.

[0061] An alternative utility model embodiment, with reference to Figures 1-4 The vacuum pump 5 and the humidifying air duct 2 are further provided with a first connecting pipeline 6.

[0062] The first connecting pipeline 6 is mainly used for connecting the vacuum pump 5 and the humidifying air duct 2. For example, one end of the first connecting pipeline 6 is in air communication with the air outlet pipeline of the vacuum pump 5, and the other end of the first connecting pipeline 6 is in air communication with the humidifying air duct 2. In addition, the pipe diameter of the first connecting pipeline 6 can be smaller than the pipe diameter of the humidifying air duct 2, so that the pipe diameter of the humidifying air duct 2 can be expanded to expand the contact area between the humidifying adsorption layer 3 and the air in the humidifying air duct 2, and the carbon dioxide release efficiency of the humidifying adsorption layer 3 can be improved. By reducing the pipe 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 ensured.

[0063] An optional utility model embodiment, referring to Figure 4 and Figure 6 The fresh-keeping device further comprises a circulating fan 7, and the circulating fan 7 is in air communication with the fresh-keeping drawer 4 and the humidifying air duct 2 respectively. When the circulating fan 7 works, the air in the humidifying air duct 2 is extracted into the fresh-keeping drawer 4.

[0064] In the embodiment of the utility model, the fresh-keeping device can further comprise a circulating fan 7, and the circulating fan 7 is in air communication with the fresh-keeping drawer 4 and the humidifying air duct 2 respectively. For example, the air inlet of the circulating fan 7 can be in air communication with the humidifying air duct 2, and the air outlet of the circulating fan 7 can be in air communication with the air inlet 402 of the fresh-keeping drawer 4. Thus, when the vacuum pump 5 works, the air in the fresh-keeping drawer 4 in a sealed environment is extracted into the humidifying air duct 2. Then, the air in the humidifying air duct 2 is sent into the fresh-keeping drawer 4 by the circulating fan 7, so that the air circulation in the fresh-keeping drawer 4 is realized.

[0065] During the air circulation in the humidifying air duct 2, the concentration of carbon dioxide in the fresh-keeping drawer 4 is improved by the release of carbon dioxide in the humidifying air duct 2 by the humidifying adsorption layer 3, so that the fresh-keeping effect of food materials in the fresh-keeping drawer 4 can be improved, and the deterioration of fruits and vegetables in the fresh-keeping drawer 4 caused by accelerated respiration under the condition of too low carbon dioxide concentration can be prevented.

[0066] An optional utility model embodiment, referring to Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 6 The second connecting pipeline 8 is further arranged between the circulating fan 7 and the humidifying air duct 2.

[0067] The second connecting pipeline 8 is mainly used for connecting the circulating fan 7 and the humidifying air duct 2. For example, one end of the first connecting pipeline 6 is connected with the air inlet pipeline of the humidifying air duct 2, and the other end of the first connecting pipeline 6 is connected with the air inlet pipeline of the circulating fan 7. In addition, the pipe diameter of the second connecting pipeline 8 can be smaller than the pipe diameter of the humidifying air duct 2, so that the pipe diameter of the humidifying air duct 2 can be expanded to expand the contact area between the humidifying adsorption layer 3 and the air in the humidifying air duct 2, and the carbon dioxide release efficiency of the humidifying adsorption layer 3 can be improved. By reducing the pipe diameter of the second connecting pipeline 8, the operating power of the circulating fan 7 can be reduced, and the air flow rate in the fresh-keeping drawer 4 can be ensured.

[0068] An optional utility model embodiment is shown in FIGS. 1-3, and the first connecting pipeline 6 is connected with one end of the humidifying air duct 2 in an air pipeline, and the second connecting pipeline 8 is connected with the other end of the humidifying air duct 2 in an air pipeline. Figure 1 and Figure 4 An optional utility model embodiment is shown in FIGS. 1-3, and the first connecting pipeline 6 is connected with one end of the humidifying air duct 2 in an air pipeline, and the second connecting pipeline 8 is connected with the other end of the humidifying air duct 2 in an air pipeline.

[0069] In the utility model embodiment, in order to improve the increase concentration of carbon dioxide in single air circulation, the first connecting pipeline 6 is connected with one end of the humidifying air duct 2 in an air pipeline, and the second connecting pipeline 8 is connected with the other end of the humidifying air duct 2 in an air pipeline. That is to say, in the process of one cycle of the gas in the fresh-keeping drawer 4, the gas can flow through the entire humidifying air duct 2. Thus, 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, so that the increase concentration of carbon dioxide in single air circulation can be maximized. The adjustment efficiency of the carbon dioxide concentration of the fresh-keeping device is improved.

[0070] In the utility model embodiment, in the case that at least two fresh-keeping drawers 4 are arranged, the at least two fresh-keeping drawers 4 are connected in an air pipeline.

[0071] In the utility model embodiment, the fresh-keeping drawer 4 can also be provided in plurality, and the number of the fresh-keeping drawer 4 can be determined according to actual design requirements or the capacity of the refrigerator by those skilled in the art, which is not limited herein. For example, the fresh-keeping drawer 4 can also be two, three or four, etc. In the case that at least two fresh-keeping drawers 4 are arranged, the at least two fresh-keeping drawers 4 are connected in an air pipeline. For example, in the case that two fresh-keeping drawers 4 are arranged, the air in the humidifying air duct 2 enters the first fresh-keeping drawer 4 through the circulating fan 7, then enters the second fresh-keeping drawer 4, and finally is extracted into the humidifying air duct 2 through the vacuum pump 5.

[0072] In summary, the utility model discloses a kind of fresh-keeping devices, the fresh-keeping device can include refrigeration air duct 1, humidification air duct 2, humidity adsorption layer 3 and fresh-keeping drawer 4, the humidity adsorption layer 3 is between the refrigeration air duct 1 and the humidification air duct 2, to carry out air duct separation, and the humidification air duct 2 and the fresh-keeping drawer 4 form gas path communication.The humidity adsorption layer 3 absorbs carbon dioxide gas in the refrigeration air duct 1 located in low humidity side, and releases carbon dioxide gas in the humidification air duct 2 located in high humidity side, to make carbon dioxide gas flow into the fresh-keeping drawer 4 and carry out food preservation. Thus carbon dioxide gas can be adsorbed from the air in the refrigeration air duct 1, without obtaining by chemical reaction etc., on the basis of simple structure, low production cost, can improve the use safety factor and use convenience of refrigerator.

[0073] The utility model embodiment further discloses a refrigerator, which is the fresh-keeping device according to any one of the above utility model embodiments.

[0074] In the utility model embodiment, the refrigerator includes a refrigerator body and the fresh-keeping device according to any one of the above utility model embodiments, and the fresh-keeping device is arranged in the refrigerator body. For example, the fresh-keeping drawer 4 can be slidingly connected or movably connected to the refrigerator body. The vacuum pump 5 and / or the circulating fan 7 are installed inside the refrigerator body. The refrigerator can include a refrigeration air duct 1, a humidification air duct 2, a humidity adsorption layer 3 and a fresh-keeping drawer 4. The humidity adsorption layer 3 is arranged between the refrigeration air duct 1 and the humidification air duct 2 to separate the air ducts, and the humidification air duct 2 is in gas path communication with the fresh-keeping drawer 4. The humidity adsorption layer 3 absorbs carbon dioxide gas in the refrigeration air duct 1 located in low humidity side, and releases carbon dioxide gas in the humidification air duct 2 located in high humidity side, to make carbon dioxide gas flow into the fresh-keeping drawer 4 and carry out food preservation. Thus carbon dioxide gas can be adsorbed from the air in the refrigeration air duct 1, without obtaining by chemical reaction etc., on the basis of simple structure, low production cost, can improve the use safety factor and use convenience of refrigerator.

[0075] An optional utility model embodiment, referring to Figure 6 The refrigerator can further include a carbon dioxide sensor 9 arranged in the fresh-keeping drawer 4 to detect the carbon dioxide concentration in the fresh-keeping drawer 4.

[0076] The refrigerator can further comprise a carbon dioxide sensor 9, the carbon dioxide sensor 9 is installed in the fresh-keeping drawer 4, so that the carbon dioxide concentration in the fresh-keeping drawer 4 can be detected, and whether the air circulation in the humidifying air duct 2 needs to be performed can be determined according to the detected carbon dioxide concentration, so that the carbon dioxide concentration in the fresh-keeping drawer 4 is improved.

[0077] An optional utility model embodiment, referring to Figure 7 The controller 10 is electrically connected with the carbon dioxide sensor 9, and the vacuum pump 5 and the circulating fan 7 of the fresh-keeping device are respectively electrically connected with the controller 10, and 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.

[0078] In the utility model embodiment, the carbon dioxide sensor 9, the vacuum pump 5 and the circulating fan 7 can be electrically connected with 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 states of the vacuum pump 5 and the circulating fan 7 according to the carbon dioxide concentration. The adjustment of the working states 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 a first concentration threshold, starting the vacuum pump 5 and the circulating fan 7 to work, and performing the air circulation between the gas in the fresh-keeping drawer 4 and the humidifying air duct 2. When it is determined that the carbon dioxide concentration is too high, for example, greater than a second concentration threshold, stopping the vacuum pump 5 and the circulating fan 7 from working, and stopping the air circulation between the gas in the fresh-keeping drawer 4 and the humidifying air duct 2.

[0079] Referring to Figure 8 The utility model embodiment further discloses a control method of a refrigerator, the refrigerator comprises the refrigerator as described in the above utility model embodiment, the control method is applied to the controller 10, and the control method comprises the following steps:

[0080] S801, obtaining a carbon dioxide concentration value detected by the carbon dioxide sensor 9.

[0081] S802, in the case that the carbon dioxide concentration value does not satisfy a set concentration condition, starting the vacuum pump 5 to send the gas in the fresh-keeping drawer 4 into the humidifying air duct 2, the humidifying adsorption layer 3 absorbs the carbon dioxide gas in the refrigerating air duct 1 located at the low humidity side, and releases the carbon dioxide gas in the humidifying air duct 2 located at the high humidity side, so as to improve the carbon dioxide concentration of the gas in the humidifying air duct 2.

[0082] S803, start the circulating fan 7, send the gas in the humidification air duct 2 into the fresh-keeping drawer 4 to improve the carbon dioxide concentration in the fresh-keeping drawer 4.

[0083] S804, in the case where it is determined that the carbon dioxide concentration value meets the set concentration condition, stop the vacuum pump 5 and the circulating fan 7.

[0084] In the embodiment of the utility model, the refrigerator can further include a carbon dioxide sensor 9, the carbon dioxide sensor 9 is installed in the fresh-keeping drawer 4, so that the carbon dioxide concentration in the fresh-keeping drawer 4 can be detected, and whether the air circulation in the humidification air duct 2 needs to be carried out can be determined according to the detected carbon dioxide concentration, so as to improve the carbon dioxide concentration in the fresh-keeping drawer 4.

[0085] The set concentration condition can include that 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.

[0086] 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 to work by the controller 10, and the air circulation between the gas in the fresh-keeping drawer 4 and the humidification air duct 2 is carried out. The carbon dioxide gas in the refrigeration air duct 1 located 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 located at the high humidity side. Therefore, the carbon dioxide concentration of the humidification air duct 2 can be improved, and the carbon dioxide concentration in the fresh-keeping drawer 4 can be improved.

[0087] In the case where 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 food preservation effect. For example, when the carbon dioxide concentration is greater than the second concentration threshold, the vacuum pump 5 and the circulating fan 7 are stopped to work, and thus the air circulation between the gas in the fresh-keeping drawer 4 and the humidification air duct 2 is stopped.

[0088] In some optional embodiments of the utility model, the control method can further include:

[0089] In response to the editing operation of the concentration control by the user, a set concentration value is obtained;

[0090] The set concentration condition is updated according to the set concentration value.

[0091] The refrigerator can further provide an interactive interface, and a concentration control is provided in the interactive interface, and the concentration control is used for adjusting the concentration of carbon dioxide in the fresh-keeping drawer 4. Thus, based on the editing operation of the user 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 can also be updated according to the set concentration value, for example, the set concentration condition can also be that the carbon dioxide concentration is greater than or equal to the set concentration threshold. Thus, the set concentration value is taken as the updated set concentration threshold.

[0092] In the case where 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 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 to work by the controller 10, and the air circulation between the gas in the fresh-keeping drawer 4 and the humidifying air duct 2 is performed. The carbon dioxide gas in the refrigeration air duct 1 located at the low humidity side is absorbed by the humidity change adsorption layer 3, and the carbon dioxide gas is released in the humidifying air duct 2 located at the high humidity side. Thus, the carbon dioxide concentration of the humidifying air duct 2 can be improved, and the carbon dioxide concentration in the fresh-keeping drawer 4 can be improved.

[0093] In the case where 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 carbon dioxide concentration in the fresh-keeping drawer 4 can achieve the optimal food preservation effect. The vacuum pump 5 and the circulating fan 7 are stopped to work, and thus the air circulation between the gas in the fresh-keeping drawer 4 and the humidifying air duct 2 is stopped.

[0094] In other optional embodiments, the refrigerator can further include a kind control provided in the interactive interface, and the fruit and vegetable kind stored in the fresh-keeping drawer 4 is determined in response to the point selection operation of the user based on the kind control. Thus, the set concentration condition matched with the fruit and vegetable kind can be determined.

[0095] For example, the fruit and vegetable kind can include but is not limited to leafy vegetables, stem vegetables, fruit vegetables, fruits and mushrooms, etc. The optimal carbon dioxide concentration required for preservation of different fruit and vegetable kinds is different, and thus the optimal carbon dioxide concentration interval can be matched based on the different fruit and vegetable kinds stored in the fresh-keeping drawer 4, as shown in Table 1 below:

[0096] Table 1: Matching example table of fruit and vegetable kind and carbon dioxide concentration

[0097]

[0098] In the above Table 1, the optimal carbon dioxide concentration for leafy vegetables is 1%-8%, the optimal carbon dioxide concentration for stem vegetables is 1%-5%, the optimal carbon dioxide concentration for fruit vegetables is 2%-8%, the optimal carbon dioxide concentration for fruits is 2%-6%, and the optimal carbon dioxide concentration for fungi is 4%-6%. Thus, when it is identified that the fruits and vegetables in the preservation drawer 4 belong to one of the above-mentioned categories, the set concentration condition matching the category of the fruits and vegetables can be determined. For example, when only fungi are placed in the preservation drawer 4, the lower limit value 4% of the carbon dioxide concentration associated with the fungi can be taken as the first concentration threshold in the set concentration condition, and the upper limit value 6% of the carbon dioxide concentration associated with the fungi can be taken as the second concentration threshold in the set concentration condition.

[0099] When it is determined that the fruits and vegetables in the preservation drawer 4 belong to at least two categories, the lower limit value and the upper limit value of the carbon dioxide concentration matching each category of the fruits and vegetables can be matched respectively. Thus, the maximum lower limit value of the carbon dioxide concentration can be taken as the first concentration threshold in the set concentration condition, and the minimum upper limit value of the carbon dioxide concentration can be taken as the second concentration threshold in the set concentration condition. For example, when leafy vegetables and fruits are placed in the preservation drawer 4 at the same time, the optimal carbon dioxide concentration for the leafy vegetables is 1%-8%, and the optimal carbon dioxide concentration for the fruits is 2%-6%. Thus, the first concentration threshold in the set concentration condition is determined to be 2%, and the second concentration threshold is determined to be 6%.

[0100] The control method of the refrigerator can include the following steps. First, the carbon dioxide concentration value detected by the carbon dioxide sensor 9 is acquired. When the carbon dioxide concentration value does not satisfy the set concentration condition, the vacuum pump 5 is started to send the gas in the preservation drawer 4 into the humidification air duct 2. The variable humidity adsorption layer 3 absorbs the carbon dioxide gas in the refrigeration air duct 1 located at the low humidity side and releases the carbon dioxide gas in the humidification air duct 2 located at the high humidity side, so as to increase the carbon dioxide concentration of the gas in the humidification air duct 2. Then, the circulating fan 7 is started to send the gas in the humidification air duct 2 into the preservation drawer 4, so as to increase the carbon dioxide concentration in the preservation drawer 4. Finally, when it is determined that the carbon dioxide concentration value satisfies the set concentration condition, the vacuum pump 5 and the circulating fan 7 are stopped. Thus, when the carbon dioxide concentration in the preservation drawer 4 needs to be adjusted, the vacuum pump 5 and the circulating fan 7 can be started to adsorb the carbon dioxide gas from the refrigeration air duct 1 to the humidification air duct 2. Thus, the carbon dioxide gas can be obtained without chemical reaction, and the safety factor and the convenience of the refrigerator can be improved on the basis of simple structure and low production cost.

[0101] Each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between embodiments can be referred to each other.

[0102] It is easy for those skilled in the art to think that any combination of the above embodiments is feasible, so any combination of the above embodiments is an embodiment of the present application. However, due to the limitation of the length, the specification will not be described in detail here.

[0103] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the specification.

[0104] Similarly, it should be understood that, in order to simplify the present application and help understand one or more of the various aspects of the present application, various features of the present application are sometimes grouped together in a single embodiment, figure, or description of the same in the above description of exemplary embodiments of the present application.

[0105] In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

Claims

1. A freshness keeping device characterized by comprising: The fresh-keeping device comprises a refrigeration air duct (1), a humidification air duct (2), a humidity-changing adsorption layer (3) and a fresh-keeping drawer (4), the humidity-changing 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 in air path communication with the fresh-keeping drawer (4). The humidity-changing adsorption layer (3) absorbs carbon dioxide gas in the refrigeration air duct (1) on the low-humidity side and releases the carbon dioxide gas in the humidification air duct (2) on the high-humidity side, so that the carbon dioxide gas flows into the fresh-keeping drawer (4) for food fresh-keeping.

2. The fresh keeping apparatus according to claim 1, wherein The humidification air duct (2) is arranged in a curved structure matching the shape of the refrigeration air duct (1).

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

4. The fresh keeping apparatus according to claim 1, wherein The humidity-changing adsorption layer (3) is made of strong alkali ion exchange resin.

5. The apparatus of claim 2, wherein The fresh-keeping device further comprises a vacuum pump (5) in air path communication with the fresh-keeping drawer (4) and the humidification air duct (2), respectively; wherein the vacuum pump (5) extracts the gas in the fresh-keeping drawer (4) into the humidification air duct (2) when working.

6. The freshness keeping apparatus according to claim 5, wherein A first connecting pipeline (6) is further arranged between the vacuum pump (5) and the humidification air duct (2).

7. The apparatus of claim 6, wherein The fresh-keeping device further comprises a circulating fan (7) in air path communication with the fresh-keeping drawer (4) and the humidification air duct (2), respectively; wherein the circulating fan (7) extracts the gas in the humidification air duct (2) into the fresh-keeping drawer (4) when working.

8. The freshness keeping device according to claim 7, characterized in that A second connecting pipeline (8) is further arranged between the circulating fan (7) and the humidification air duct (2).

9. The freshness keeping apparatus according to claim 8, wherein One end of the first connecting pipeline (6) is in air path communication with the humidification air duct (2), and the other end of the second connecting pipeline (8) is in air path communication with the humidification air duct (2).

10. The apparatus of claim 1, wherein, In the case that the fresh-keeping drawer (4) is provided with at least two, the at least two fresh-keeping drawers (4) are in air path communication.

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

12. The refrigerator according to claim 11, characterized in that, The refrigerator further comprises a carbon dioxide sensor (9) 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) is electrically connected with the controller (10), and the vacuum pump (5) of the fresh-keeping device and the circulating fan (7) of the fresh-keeping device are respectively electrically connected with 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 detected by the carbon dioxide sensor (9).

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