Fresh-keeping device, food material fresh-keeping method and refrigerator

Abstract

The invention provides a fresh-keeping device, a food material fresh-keeping method and a refrigerator, and the fresh-keeping device comprises a shell which defines a storage cavity; the illumination assembly is arranged in the storage cavity; the illumination assembly has a first light-emitting state, and in the first light-emitting state, the illumination assembly only emits blue light; and the first controlled atmosphere film is arranged on the shell and is configured to generate a photocatalytic reaction under the condition that the illumination assembly emits the blue light, so that the concentration of carbon dioxide in the storage cavity is increased, and the concentration of oxygen is reduced.

Description

Technical Field

[0001] The present application relates to the field of fresh-keeping technology, and in particular to a fresh-keeping device, a food fresh-keeping method and a refrigerator. Background Art

[0002] Food preservation is an important research topic in the development of refrigerators. Controlled atmosphere preservation is an important branch of the field of food preservation. However, controlled atmosphere preservation takes a long time to make the oxygen and carbon dioxide concentrations in the storage space reach the appropriate concentration; and during this period, if the storage space is opened, it needs to be re-conditioned, resulting in the need to extend the food preservation time, which in turn affects the food preservation effect. Summary of the invention

[0003] The present application provides a fresh-keeping device, a food fresh-keeping method and a refrigerator, aiming to solve the technical problem of long atmosphere-controlled fresh-keeping time of food in the prior art.

[0004] In a first aspect, the present application provides a fresh-keeping device, comprising:

[0005] a housing defining a storage cavity;

[0006] an illumination component, the illumination component being disposed in the storage cavity; the illumination component having a first light-emitting state, in which the illumination component only emits blue light; and

[0007] The first atmosphere-modifying film is disposed on the housing and is configured to generate a photocatalytic reaction when the illumination component emits the blue light, so as to increase the concentration of carbon dioxide and reduce the concentration of oxygen in the storage cavity.

[0008] Optionally, the illumination component also has a second light-emitting state; in the second light-emitting state, the illumination component emits at least one of red light, green light and purple light while emitting blue light.

[0009] Optionally, the fresh-keeping device is further provided with an air door, which is movably arranged at the air outlet of the fresh-keeping device and has a ventilation state in which the air outlet is opened and a closed state in which the air outlet is closed.

[0010] Optionally, a second controlled atmosphere film is further provided at the air outlet, and the second controlled atmosphere film is configured so that when the damper is in the ventilation state, oxygen outside the fresh-keeping device enters the storage cavity through the second controlled atmosphere film, and carbon dioxide in the storage cavity flows out of the fresh-keeping device through the second controlled atmosphere film.

[0011] Optionally, the oxygen permeability coefficient of the second modified atmosphere film is 2*10 -13 Up to 8*10 -13 cm 3 cm / (cm2 ·s·Pa), the carbon dioxide permeability coefficient of the second modified atmosphere membrane is 6*10 -13 To 8*10 -13 cm 3 cm / (cm 2 ·s·Pa).

[0012] Optionally, the shell is provided with an air port connecting the outside world and the storage cavity; the first modified atmosphere membrane is provided at the air port, and is used to allow gas to be exchanged between the outside world and the storage cavity through the first modified atmosphere membrane; the oxygen permeability coefficient of the first modified atmosphere membrane is 4*10 -14 Up to 8*10 -14 cm 3 cm / (cm 2 ·s·Pa), the carbon dioxide permeability coefficient of the first modified atmosphere membrane is 1*10 -13 To 3*10 -13 cm 3 cm / (cm 2 ·s·Pa).

[0013] Optionally, the fresh-keeping device further includes an oxygen sensor and a carbon dioxide sensor; the oxygen sensor is configured to collect the oxygen concentration in the storage cavity, and the carbon dioxide sensor is configured to collect the carbon dioxide concentration in the storage cavity.

[0014] In a second aspect, the present application also provides a method for preserving food, which is applied to the above-mentioned preservation device, and the method for preserving food includes:

[0015] After the food is placed in the fresh-keeping device for a preset time, the lighting component is controlled to emit only blue light; wherein, after the food is placed in the fresh-keeping device for a preset time, the food enters a nutrient retention stage.

[0016] Optionally, after controlling the illumination component to emit only blue light, the food preservation method further includes:

[0017] Obtaining the carbon dioxide concentration and oxygen concentration in the storage cavity;

[0018] When the carbon dioxide concentration is within a first preset range and the oxygen concentration is within a second preset range, the illumination component is controlled to turn off the blue light; wherein the first preset range includes a first endpoint value and a second endpoint value, and the second preset range includes a third endpoint value and a fourth endpoint value; the first endpoint value is less than the second endpoint value, and the third endpoint value is less than the fourth endpoint value;

[0019] When the oxygen concentration is lower than the third endpoint value or the carbon dioxide concentration is higher than the second endpoint value, the damper is controlled to open so as to input oxygen into the storage cavity and discharge carbon dioxide out of the storage cavity, until the carbon dioxide concentration is within a first preset range and the oxygen concentration is within a second preset range, and then the damper is closed;

[0020] When the oxygen concentration is higher than the second endpoint value or the carbon dioxide concentration is lower than the first endpoint value, the illumination component is controlled to emit blue light. When the carbon dioxide concentration is within a first preset range and the oxygen concentration is within a second preset range, the illumination component is turned off to emit blue light.

[0021] The embodiment of the present application further proposes a refrigerator, comprising the aforementioned preservation device or controller, wherein the controller is used to execute the aforementioned food preservation method.

[0022] In the technical solution of the embodiment of the present application, a lighting component is provided in the storage cavity; when the lighting component emits only blue light, the first atmosphere-modifying membrane generates a photocatalytic reaction, consumes the oxygen in the storage cavity and generates carbon dioxide, increases the concentration of carbon dioxide in the storage cavity, reduces the oxygen concentration in the storage cavity, and quickly forms a low-oxygen and high-carbon dioxide environment in the storage cavity to preserve the food; because the first atmosphere-modifying membrane can quickly generate a photocatalytic reaction under a blue light environment, it helps to improve the efficiency of atmosphere-modifying, accelerate the formation of a low-oxygen and high-carbon dioxide environment, and thus improve the atmosphere-modifying preservation effect. In addition, even if the low-oxygen and high-carbon dioxide environment is destroyed after the food in the preservation device is taken out and placed, the first atmosphere-modifying membrane quickly performs a photocatalytic reaction under the action of blue light, so that the gas environment in the storage cavity can quickly return to a low-oxygen and high-carbon dioxide environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 is a schematic diagram of the structure of the fresh-keeping device provided in an embodiment of the present application;

[0025] Figure 2 is another structural schematic diagram of the fresh-keeping device provided in an embodiment of the present application;

[0026] Figure 3 This is a schematic diagram of the process of the food preservation method provided in the embodiment of the present application Figure 1 ;

[0027] Figure 4 This is a schematic diagram of the process of the food preservation method provided in the embodiment of the present application Figure 2 ;

[0028] Figure 5 This is a schematic diagram of the process of the food preservation method provided in the embodiment of the present application Figure 3 .

[0029] List of reference numerals:

[0030] 100, fresh-keeping device; 110, shell; 120, lighting assembly; 130, first atmosphere-modifying membrane; 140, air door; 150, second atmosphere-modifying membrane; 160, oxygen sensor; 170, carbon dioxide sensor; S, storage cavity. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the invention can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0034] The preservation principle of controlled atmosphere film is to utilize the oxygen consumed and carbon dioxide produced during the respiration of fruits and vegetables, and cooperate with the oxygen permeability and carbon dioxide permeability of spontaneous controlled atmosphere film to reduce the oxygen concentration and increase the carbon dioxide concentration in the enclosed space to meet the low oxygen and high carbon dioxide concentration requirements of the food.

[0035] like Figure 1 As shown, the embodiment of the present application provides a fresh-keeping device 100, comprising:

[0036] A housing 110, wherein the housing 110 defines a storage cavity S;

[0037] an illumination component 120, wherein the illumination component 120 is disposed in the storage cavity S; the illumination component 120 has a first light-emitting state, in which the illumination component 120 only emits blue light; and

[0038] The first modified atmosphere film 130 is disposed on the housing 110 and is configured to generate a photocatalytic reaction when the illumination assembly 120 emits the blue light, so as to increase the concentration of carbon dioxide in the storage cavity S and reduce the concentration of oxygen.

[0039] In the technical solution of the embodiment of the present application, a lighting component 120 is provided in the storage cavity S; when the lighting component 120 emits only blue light, the first gas-conditioning film 130 generates a photocatalytic reaction, consumes oxygen in the storage cavity S and generates carbon dioxide, increases the concentration of carbon dioxide in the storage cavity S, reduces the oxygen concentration in the storage cavity S, and quickly forms a low-oxygen and high-carbon dioxide environment in the storage cavity S to preserve the food; because the first gas-conditioning film 130 can quickly generate a photocatalytic reaction under the blue light environment, it helps to improve the gas-conditioning efficiency, accelerate the formation of a low-oxygen and high-carbon dioxide environment, and thus improve the gas-conditioning preservation effect. In addition, even if the low-oxygen and high-carbon dioxide environment is destroyed after the food in the preservation device 100 is taken out and placed, the first gas-conditioning film 130 quickly performs a photocatalytic reaction under the action of blue light, so that the gas environment in the storage cavity S can quickly return to a low-oxygen and high-carbon dioxide environment.

[0040] In the embodiment, the first atmosphere-controlled film 130 is provided with a photocatalytic material ZnO / g-C3N4 that can be specifically excited, thereby promoting a photocatalytic reaction to generate free electrons and holes, the free electrons react with oxygen to generate superoxide ion free radicals and -OOH free radicals, the holes react with water to generate hydroxyl free radicals -OH, and the above strong oxidizing substances can be used for sterilization and deodorization in the condensation and high humidity environment of the atmosphere-controlled fresh-keeping sealed drawer to prevent the growth of microorganisms caused by high humidity, and it generates carbon dioxide and water in the process of sterilization and deodorization. Therefore, the occurrence of the photocatalytic reaction has two functions, which can not only consume oxygen to generate carbon dioxide, but also sterilize and deodorize, so that the storage cavity S forms a low-oxygen and high-carbon dioxide environment more quickly.

[0041] In addition, in the technical solution of the present application, when the illumination component 120 emits blue light, it can also trigger the occurrence of a photodynamic reaction. The porphyrins in the microorganisms are used as photosensitizers. The blue light excites the porphyrins to produce active substances such as singlet oxygen and free radicals inside the microorganisms, thereby causing the death of the microorganisms and improving the preservation effect and preservation time of the food.

[0042] In an embodiment, the film material in the first gas-modifying film 130 may include PVE and / or PE, and a photocatalytic material such as ZnO / g-C3N4 is disposed on the film material.

[0043] As an optional implementation of the above embodiment, the illumination component 120 also has a second light-emitting state; in the second light-emitting state, the illumination component 120 emits at least one of red light, green light and purple light while emitting blue light. In an embodiment, when the food is just put into the preservation device 100, the illumination component 120 can be adjusted to operate in the second light-emitting state; at this time, when emitting blue light, the illumination component can also emit at least one of red light, green light or purple light, and the illumination component 120 operates in the second light-emitting state for a preset time, such as 24 hours; and, during the process of being turned on for the preset time, the illumination component 120 operates according to a preset on-off rate (such as a 50% on-off rate, that is, the time ratio of turning on the second light-emitting state to stopping the light-emitting state is 1:1, and the on-off rate can also be adjusted according to the situation) to prevent the storage cavity S from being too hot due to long-term exposure and to ensure sufficient light; during the exposure process, red light can stimulate the photosynthesis of fruits and vegetables, help them continue the growth process, and increase the synthesis of vitamin C; blue light can regulate the plant biological clock and increase the content of substances such as anthocyanins, flavonoids, and total phenols; green light can penetrate into deeper layers of the leaves due to its lower absorption efficiency and stimulate chlorophyll molecules deeper in the leaves. This helps the deeper chlorophyll to use light for photosynthesis to a certain extent; purple light can improve the resistance of plants to adverse external conditions such as microorganisms and temperature fluctuations. At this stage, the intensity of photosynthesis is greater than the intensity of respiration. Through the combined effect of the above light, the nutrients of fruits and vegetables are increased in the early stage of food.

[0044] In some embodiments, when the illumination component 120 is in the second light-emitting state, the illumination component 120 emits red light, blue light, filtered light, and violet light simultaneously. In an embodiment, the illumination component 120 may be an LED light component with a tuning function, which can be adjusted to light of different wavelengths by adjusting the output current; the wavelength range of red light is about 620-700 nanometers; the wavelength range of green light is about 520-570 nanometers; the wavelength range of blue light is about 450-495 nanometers; and the wavelength range of violet light is about 360-430 nanometers.

[0045] When food is preserved using the preservation device 100 proposed in the embodiment of the present application, after the food is placed in the preservation device 100, it enters the initial stage of food preservation (nutrient enhancement stage). At this time, the lighting component 120 is controlled to operate in the second light-emitting state for a preset period of time; after the preset period of time, the lighting component 120 is controlled to operate in the first light-emitting state and enters the nutrient retention stage, that is, the lighting component 120 only emits blue light, and the preservation device 100 enters the atmosphere-controlled preservation stage, so that the oxygen concentration in the environment decreases and the carbon dioxide concentration increases.

[0046] As an optional implementation of the above embodiment, Figure 1As shown, the fresh-keeping device 100 is also provided with a damper 140, which is movably arranged at the air outlet of the fresh-keeping device 100, and has a ventilation state in which the air outlet is opened and a closed state in which the air outlet is closed. In the embodiment, the food (plant) needs to breathe, and since oxygen is also consumed during the atmosphere conditioning stage, in order to avoid the food (plant) from performing anaerobic respiration and causing the food to deteriorate, when the oxygen concentration is low, by opening the damper 140, the storage chamber S is connected to the outside through the air outlet, and the outside oxygen flows into the storage chamber S, so as to avoid the food from anaerobic respiration during the atmosphere conditioning and fresh-keeping stage. When the oxygen concentration is appropriate, the damper 140 closes the air outlet.

[0047] In an embodiment, the damper 140 may be rotatably connected to the air outlet, or may be slidably connected to the air outlet. The fresh-keeping device 100 is further provided with a driving mechanism, which is used to drive the damper 140 to rotate or slide to open or close the air outlet. The driving mechanism includes a motor and a transmission member. The motor drives the transmission member to drive the damper 140 to rotate or slide. The transmission member may be a gear mechanism, a gear rack mechanism, etc.

[0048] As an optional implementation of the above embodiment, Figure 1 As shown, a second modified atmosphere film 150 is further provided at the air outlet, and the second modified atmosphere film 150 is configured so that when the damper 140 is in the ventilation state, oxygen outside the fresh-keeping device 100 enters the storage cavity S through the second modified atmosphere film 150, and carbon dioxide in the storage cavity S flows out to the outside of the fresh-keeping device 100 through the second modified atmosphere film 150. In an embodiment, the second modified atmosphere film 150 is used to prevent oxygen from entering the storage cavity S too quickly and carbon dioxide from flowing out of the storage cavity S too quickly, so that the oxygen and carbon dioxide concentrations of the gas in the storage cavity S are gradually adjusted to a concentration range suitable for fresh-keeping; when an ultra-low oxygen environment is formed in the storage cavity S, the damper 140 is opened, and oxygen in the storage space flows into the interior through the second modified atmosphere film 150, and carbon dioxide in the storage cavity S overflows to the outside through the second modified atmosphere film 150.

[0049] In an embodiment, the material of the second modified atmosphere film 150 is a blend of PBAT and PLA.

[0050] As an alternative implementation of the above embodiment, the oxygen permeability coefficient of the second modified atmosphere film 150 is 2*10 -13 Up to 8*10 -13 cm 3 cm / (cm 2 ·s·Pa), the carbon dioxide permeability coefficient of the second gas-controlled membrane 150 is 6*10 -13 To 8*10 -13 cm 3 cm / (cm2 ·s·Pa).

[0051] As an optional implementation of the above embodiment, Figure 2 As shown, the housing 110 is provided with an air port connecting the outside world and the storage chamber S; the first modified atmosphere film 130 is provided at the air port, and is used to allow gas to be exchanged between the outside world and the storage chamber S through the first modified atmosphere film 130; the oxygen permeability coefficient of the first modified atmosphere film 130 is 4*10 - 14 cm 3 cm / (cm 2 ·s·Pa) to 8*10 -14 cm 3 cm / (cm 2 ·s·Pa), the carbon dioxide permeability coefficient of the first gas-adjusting membrane 130 is 1*10 -13 cm 3 cm / (cm 2 ·s·Pa) to 3*10 -13 cm 3 cm / (cm 2 ·s·Pa). After the nutrients in the plant are raised to a certain stage, the internal nutrients will begin to decrease, mainly due to the strong respiration. At this time, as the respiration proceeds, since the external gas can be exchanged with the internal gas through the first gas-adjusting membrane 130, during the respiration process, due to the consumption of oxygen, carbon dioxide is generated, the oxygen concentration in the storage cavity S gradually decreases, and the carbon dioxide concentration increases. Based on the osmotic pressure difference, the gas begins to diffuse, oxygen diffuses from the outside of the drawer to the inside of the drawer, and carbon dioxide diffuses from the inside of the drawer to the outside of the drawer, so that the gas environment in the storage cavity S maintains a certain oxygen concentration and carbon dioxide concentration.

[0052] In the embodiment, the oxygen permeability coefficient and the carbon dioxide permeability coefficient of the first modified atmosphere film and the second modified atmosphere film are measured in the following manner: a spontaneous modified atmosphere film is taken and cut into discs of a preset diameter (e.g., 8 cm) by a film sampler, and the film surface is ensured to be flat, clean and free of obvious defects, and then the O2 and CO2 permeability of the sample is tested by a gas permeability tester, and specifically, the differential pressure method can be used for testing. For example, the GB / T 1038.1-2022 (differential pressure method) can be used for testing.

[0053] In the embodiment, the oxygen permeability coefficient of the first modified atmosphere film 130 is smaller than that of the second modified atmosphere film 150, and the carbon dioxide permeability coefficient of the first modified atmosphere film 130 is smaller than that of the second modified atmosphere film 150; this is mainly because when entering the food nutrient retention stage, when the first modified atmosphere film 130 is triggered by blue light to undergo a photocatalytic reaction, compared with the second modified atmosphere film 150, the speed at which oxygen enters the storage cavity S through the first modified atmosphere film 130 is slower, and the speed at which carbon dioxide overflows to the outside through the first modified atmosphere film 130 is slower, so that the photocatalytic reaction can quickly consume oxygen, and a low-oxygen and high-carbon dioxide environment can be quickly formed in the storage cavity S; and when oxygen is needed in the storage cavity S, opening the damper 140 can allow external oxygen to enter the storage cavity S at a faster speed through the second modified atmosphere film 150 with a larger permeability coefficient, and carbon dioxide can quickly overflow to the outside of the storage cavity S, thereby reducing the time of anaerobic respiration of plant food or avoiding anaerobic respiration of plant food.

[0054] In addition, in the prior art, fruits and vegetables preserved in controlled atmosphere are prone to mold risk due to high humidity. Since spontaneous controlled atmosphere has high requirements for sealing, in order to quickly achieve the optimal controlled atmosphere concentration required by the food, it is necessary to ensure that the controlled atmosphere space is completely sealed. In the case of complete sealing, high humidity condensation will occur in the drawer space, thus creating conditions for the growth of microorganisms. In some embodiments of the present application, the outside air can be exchanged with the internal gas through the first controlled atmosphere film 130, and then the preservation device 100 of the present application is preserved in a relatively closed hole, which is conducive to avoiding high humidity condensation in the preservation device 100, but not conducive to the growth of microorganisms, and reducing the risk of mold.

[0055] As an optional implementation of the above embodiment, the fresh-keeping device 100 further includes an oxygen sensor 160 and a carbon dioxide sensor 170; the oxygen sensor 160 is configured to collect the oxygen concentration in the storage cavity S, and the carbon dioxide sensor is configured to collect the carbon dioxide concentration in the storage cavity S. The state switching of the damper 140 and the state switching of the illumination assembly 120 are controlled by the measured oxygen concentration and carbon dioxide concentration, so that the oxygen concentration and carbon dioxide concentration in the gas in the storage cavity S are kept within a set range.

[0056] In combination with the fresh-keeping device 100 proposed in the embodiment of the present application, Figure 3 As shown, the embodiment of the present application also provides a method for preserving food, and the method for preserving food includes:

[0057] S200, after the food is placed in the fresh-keeping device 100 for a preset time, the lighting assembly 120 is controlled to emit only blue light; wherein, after the food is placed in the fresh-keeping device 100 for a preset time, the food enters a nutrient retention stage.

[0058] In the embodiment, after the food is placed in the fresh-keeping device 100 for a preset time, the food enters the nutrient retention stage. At this time, the internal nutrients begin to be lost due to respiration. At this time, in order to inhibit its respiration, the lighting component 120 emits blue light, causing the first atmosphere-modifying film 130 to produce a photocatalytic reaction, consuming the oxygen inside it to produce carbon dioxide, causing the oxygen concentration in the storage cavity S to decrease and the carbon dioxide concentration to increase, thereby achieving the purpose of fresh-keeping inhibition and preserving the food.

[0059] In some embodiments, in order to avoid anaerobic respiration of food during the stage of maintaining nutrient substances in the food, the first modified atmosphere membrane 130 is configured as follows: external gas can be slowly exchanged with the gas in the storage cavity S through the first modified atmosphere membrane 130; by irradiating the first modified atmosphere membrane 130 with blue light, part of the oxygen participates in the photocatalytic reaction, and the other part is used for the respiration of the food.

[0060] In an embodiment, Figure 4 As shown, the food preservation method also includes:

[0061] S100, after the food is placed in the fresh-keeping device 100, the illumination component 120 is controlled to operate in the second light-emitting state for the preset time; wherein, after the food is placed in the fresh-keeping device 100 for the preset time, the food enters the nutrient retention stage. That is, before step S200, the illumination component 120 emits at least one of red light, green light and purple light while emitting blue light, so as to enhance the nutrients of the food and help preserve it.

[0062] As an optional implementation of the above embodiment, Figure 5 As shown, after controlling the illumination assembly 120 to emit only blue light, the food preservation method further includes:

[0063] S301, obtaining the carbon dioxide concentration and oxygen concentration in the storage cavity S;

[0064] S302, when the carbon dioxide concentration is within a first preset range and the oxygen concentration is within a second preset range, controlling the illumination assembly 120 to turn off the blue light; wherein the first preset range includes a first endpoint value and a second endpoint value, and the second preset range includes a third endpoint value and a fourth endpoint value; the first endpoint value is less than the second endpoint value, and the third endpoint value is less than the fourth endpoint value;

[0065] S303, when the oxygen concentration is lower than the third endpoint value or the carbon dioxide concentration is higher than the second endpoint value, the damper 140 is controlled to open so as to input oxygen into the storage chamber S and discharge carbon dioxide out of the storage chamber S, until the carbon dioxide concentration is within the first preset range and the oxygen concentration is within the second preset range, and the damper 140 is closed;

[0066] S304, when the oxygen concentration is higher than the second endpoint value or the carbon dioxide concentration is lower than the first endpoint value, control the illumination component 120 to emit blue light, until the carbon dioxide concentration is within the first preset range and the oxygen concentration is within the second preset range, turn off the illumination component 120 to emit blue light.

[0067] In some specific embodiments, the oxygen concentration and carbon dioxide concentration in the storage chamber S are adjusted by obtaining the oxygen concentration and carbon dioxide concentration in the storage chamber S and adjusting the state of the damper 140 and the state of the illumination component 120, so that the oxygen concentration is within the second preset range and the carbon dioxide concentration is within the first preset range. For example, an oxygen sensor 160 and a carbon dioxide sensor 170 are set in the storage chamber S. When the oxygen concentration in the storage chamber S reaches 5%-10% and the carbon dioxide concentration reaches 3%-10%, it is the best atmosphere for most fruits and vegetables. When the oxygen concentration and the carbon dioxide concentration meet the above two concentration ranges at the same time, the illumination component is turned off and the photocatalytic reaction is suspended to prevent the oxygen concentration in the space from being too low and the carbon dioxide concentration from being too high, causing anaerobic respiration of fruits and vegetables. When it is detected that the oxygen concentration is lower than 5% or the carbon dioxide concentration is higher than 10%, it indicates that there may be a risk of anaerobic respiration. At this time, the damper 140 is opened, and the second gas-conditioning membrane 150 is arranged at the air outlet. It uses its own high air permeability to make the oxygen outside the storage cavity S flow into the inside faster, and the carbon dioxide inside the storage cavity S overflow to the outside faster. When the oxygen concentration is higher than 5% and the carbon dioxide concentration is lower than 10%, the damper 140 is closed; when the oxygen concentration is higher than 10% or the carbon dioxide concentration is lower than 3%, the lighting component 120 is controlled to emit only blue light to trigger a photocatalytic reaction, so that the gas atmosphere inside the storage cavity S reaches the optimal oxygen concentration and carbon dioxide concentration as soon as possible.

[0068] In the embodiment, the ranges of the first preset range and the second preset range are specifically set by those skilled in the art, and the above specific embodiment is only a preferred implementation scheme. In addition, the first preset range and the second preset range can be set according to the food to be preserved. For example, when preserving food, the user can select the type of food to be preserved. The system sets the first preset range and the second preset range according to the type of food and the corresponding relationship set in the system, so as to preserve the food in a targeted manner.

[0069] When using the preservation device 100 provided in the embodiment of the present application and the food preservation method applied to the preservation device 100, when the user initially places the food, different lighting components 120 irradiate blue light and a combination of red light, green light and purple light, so that the fruits and vegetables continue to breathe and the nutrients are improved; the lighting component 120 can also be adjusted to emit only blue light, and the blue light triggers the photocatalytic reaction; the first gas-conditioning film 130 adds a photocatalytic material to control the transmission coefficient of oxygen and carbon dioxide, so as to form a low-oxygen and high-carbon dioxide atmosphere more quickly and make the gas-conditioning film itself have the function of sterilization and deodorization; the photocatalytic material adopts a narrow bandgap material such as ZnO / g-C3N4, which can be excited by blue light, and while sterilizing and deodorizing, consumes oxygen and produces Generate carbon dioxide to help the atmosphere-controlled fresh-keeping space reach the optimal gas atmosphere faster; blue light sterilizes from two aspects: one is triggering photocatalysis, and the other is photodynamic sterilization; real-time detection and regulation of oxygen and carbon dioxide: through real-time detection of oxygen and carbon dioxide sensors 170, timely close or open the tunable blue light of the photocatalytic reaction and the damper 140 of the second atmosphere-controlled membrane 150; the damper 140 of the second atmosphere-controlled membrane 150 is opened, and the air outlet is set with the second atmosphere-controlled membrane 150, and its high air permeability (compared with the first atmosphere-controlled membrane 130) is used for gas exchange, which is not only conducive to the atmosphere-controlled fresh-keeping space to reach the optimal gas atmosphere faster, but also can timely remove ethylene, aldehydes and other substances harmful to fruits and vegetables generated in the fresh-keeping space.

[0070] The embodiment of the present application also proposes a refrigerator, including a preservation device 100 or a controller, and the controller is used to execute a method for preserving food. In an embodiment, the preservation device 100 adopts a part or all of the embodiments in the aforementioned embodiments; in some embodiments, the preservation device 100 is constructed as a compartment of a refrigerator, and a drawer is provided in the compartment. The method for preserving food adopts a part or all of the steps of the method for preserving food in the aforementioned embodiments. The embodiment of the present application also proposes a control system for preserving food, including: one or more processors; a memory; and one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the method for preserving food as described above.

[0071] In general, usually, the food preservation control system includes: at least one processor, at least one memory, and a control program of the food preservation control system stored in the memory and executable on the processor, and the control program of the food preservation control system is configured to implement the steps of the foregoing food preservation method.

[0072] The processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. The processor may also include an AI (Artificial Intelligence) processor, which is used to process the control method operation of the food preservation control system, so that the control method model of the food preservation control system can be trained and learned autonomously to improve efficiency and accuracy.

[0073] The memory may include one or more computer-readable storage media, which may be non-transitory. The memory may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory is used to store at least one instruction, which is used to be executed by the processor to implement the food preservation method of the food preservation control system provided in the method embodiment of the present application.

[0074] The above is a detailed introduction to a fresh-keeping device, a food fresh-keeping method and a refrigerator provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A fresh-keeping device, characterized in that: include: a housing defining a storage cavity; A lighting assembly, wherein the lighting assembly is disposed in the storage cavity; The illumination component has a first light-emitting state, in which the illumination component emits only blue light; as well as The first atmosphere-modifying film is disposed on the housing and is configured to generate a photocatalytic reaction when the illumination component emits the blue light, so as to increase the concentration of carbon dioxide and reduce the concentration of oxygen in the storage cavity.

2. The fresh-keeping device according to claim 1, characterized in that: The illumination component also has a second light-emitting state; in the second light-emitting state, the illumination component emits at least one of red light, green light and purple light while emitting blue light.

3. The fresh-keeping device according to claim 1, characterized in that: The fresh-keeping device is also provided with an air door, which is movably arranged at the air outlet of the fresh-keeping device and has a ventilation state in which the air outlet is opened and a closed state in which the air outlet is closed.

4. The fresh-keeping device according to claim 3, characterized in that: A second controlled atmosphere film is also provided at the air outlet, and the second controlled atmosphere film is configured so that when the damper is in the ventilation state, oxygen outside the fresh-keeping device enters the storage cavity through the second controlled atmosphere film, and carbon dioxide in the storage cavity flows out of the fresh-keeping device through the second controlled atmosphere film.

5. The fresh-keeping device according to claim 4, characterized in that: The oxygen permeability coefficient of the second modified atmosphere film is 2*10 -13 cm 3 cm / (cm 2 ·s·Pa) to 8*10 -13 cm 3 cm / (cm 2 ·s·Pa), the carbon dioxide permeability coefficient of the second modified atmosphere membrane is 6*10 -13 cm 3 cm / (cm 2 ·s·Pa) to 8*10 -13 cm 3 cm / (cm 2 ·s·Pa).

6. The fresh-keeping device according to any one of claims 1 to 4, characterized in that: The shell is provided with an air port connecting the outside world and the storage cavity; the first gas-modifying membrane is provided at the air port, and is used to allow gas to be exchanged between the outside world and the storage cavity through the first gas-modifying membrane; and / or The oxygen permeability coefficient of the first modified atmosphere membrane is 4*10 -14 Up to 8*10 -14 cm 3 cm / (cm 2 ·s·Pa), the carbon dioxide permeability coefficient of the first modified atmosphere membrane is 1*10 -13 To 3*10 -13 cm 3 cm / (cm 2 ·s·Pa).

7. The fresh-keeping device according to claim 1, characterized in that: The fresh-keeping device also includes an oxygen sensor and a carbon dioxide sensor; the oxygen sensor is configured to collect the oxygen concentration in the storage cavity, and the carbon dioxide sensor is configured to collect the carbon dioxide concentration in the storage cavity.

8. A method for preserving food, characterized in that: The fresh-keeping device applied to any one of claims 1 to 7, wherein the food fresh-keeping method comprises: After the food is placed in the fresh-keeping device for a preset time, the lighting component is controlled to emit only blue light; wherein, after the food is placed in the fresh-keeping device for a preset time, the food enters a nutrient retention stage.

9. The method for preserving food according to claim 8, characterized in that: After controlling the illumination component to emit only blue light, the food preservation method further includes: Obtaining the carbon dioxide concentration and oxygen concentration in the storage cavity; When the carbon dioxide concentration is within a first preset range and the oxygen concentration is within a second preset range, the illumination component is controlled to turn off the blue light; wherein the first preset range includes a first endpoint value and a second endpoint value, and the second preset range includes a third endpoint value and a fourth endpoint value; the first endpoint value is less than the second endpoint value, and the third endpoint value is less than the fourth endpoint value; When the oxygen concentration is lower than the third endpoint value or the carbon dioxide concentration is higher than the second endpoint value, the damper is controlled to open so as to input oxygen into the storage cavity and discharge carbon dioxide out of the storage cavity, until the carbon dioxide concentration is within a first preset range and the oxygen concentration is within a second preset range, and then the damper is closed; When the oxygen concentration is higher than the second endpoint value or the carbon dioxide concentration is lower than the first endpoint value, the illumination component is controlled to emit blue light. When the carbon dioxide concentration is within a first preset range and the oxygen concentration is within a second preset range, the illumination component is turned off to emit blue light.

10. A refrigerator, characterized in that: It comprises the preservation device or controller according to any one of claims 1 to 7, and the controller is used to execute the food preservation method according to claim 8 or 9.

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