Fresh-keeping device and refrigerator

Abstract

The embodiment of the utility model provides a fresh-keeping device and a refrigerator, and the fresh-keeping device comprises a storage chamber in which a fresh-keeping space is formed; the first air adjusting assembly is used for extracting oxygen from the storage chamber; the second air conditioning assembly comprises a carbon dioxide humidity integration module communicated with the storage chamber, and the carbon dioxide humidity integration module comprises a moisture absorption part used for adsorbing moisture in gas entering from the environment outside the storage chamber and releasing the moisture and an adsorption part used for adsorbing carbon dioxide in the gas entering from the environment outside the storage chamber and releasing the carbon dioxide. The fresh-keeping device provided by the embodiment of the utility model can realize comprehensive adjustment of the concentration of oxygen, the concentration of carbon dioxide and the humidity in the storage chamber, can reduce the concentration of oxygen in the storage chamber and improve the concentration of carbon dioxide in the storage chamber, and can humidify the storage chamber, so that fruits and vegetables are stored in an optimal controlled atmosphere environment; the fresh-keeping time of fruits and vegetables is longer, and the fresh-keeping quality is better.

Description

Technical Field

[0001] This utility model relates to the field of food preservation technology, and in particular to a food preservation device and a refrigerator. Background Technology

[0002] Refrigerators are devices that extend the freshness of food. With the development of refrigerator technology, users have higher and higher requirements for food preservation, demanding not only extended preservation time but also guaranteed food quality.

[0003] Modified atmosphere storage technology is widely used in the field of fruit and vegetable preservation. It is divided into active and passive modified atmosphere storage. Current active modified atmosphere storage typically uses air pumps and modified atmosphere membranes to reduce the oxygen content within the storage room.

[0004] However, existing active atmosphere control schemes do not consider adjusting other parameters besides oxygen content. Utility Model Content

[0005] This utility model provides a preservation device and a refrigerator to solve the technical problem that existing active atmosphere control solutions do not consider the adjustment of other parameters besides oxygen content.

[0006] This utility model discloses a food preservation device, including:

[0007] Storage room, wherein a preservation space is formed within the storage room;

[0008] A first controlled atmosphere assembly is used to extract oxygen from the storage chamber;

[0009] The second controlled atmosphere assembly includes a carbon dioxide humidity integrated module connected to the storage chamber. The carbon dioxide humidity integrated module includes a moisture-absorbing section for adsorbing and releasing moisture in the gas entering from the environment outside the storage chamber, and an adsorption section for adsorbing and releasing carbon dioxide in the gas entering from the environment outside the storage chamber.

[0010] Optionally, the carbon dioxide humidity integrated module has an air inlet end communicating with the environment outside the storage room and an exhaust end communicating with the storage room, the adsorption part is a humidification adsorption part, and the humidification adsorption part and the humidification adsorption part are respectively close to the air inlet end and the exhaust end of the carbon dioxide humidity integrated module.

[0011] The variable humidity adsorption section is used to adsorb carbon dioxide in the gas flowing through the variable humidity adsorption section when the humidity is less than or equal to a first humidity, and to release carbon dioxide when the humidity of the variable humidity adsorption section is greater than or equal to a second humidity.

[0012] Optionally, the moisture-absorbing part includes a moisture-absorbing body and a heating component disposed on the moisture-absorbing body. The moisture-absorbing body is used to absorb moisture in the gas flowing through the moisture-absorbing body and release the moisture after the heating component is turned on.

[0013] Optionally, the preservation device further includes a third controlled atmosphere assembly for removing carbon dioxide from the storage chamber.

[0014] Optionally, the third controlled atmosphere assembly includes a vent hole formed on the storage chamber, a carbon dioxide permeable membrane for carbon dioxide to pass through, and a cover member movably connected to the storage chamber. The carbon dioxide permeable membrane is disposed in the vent hole, and the cover member is used to open or close the vent hole.

[0015] Optionally, the exhaust end of the carbon dioxide humidity integration module is connected to the storage chamber through a first exhaust pipe;

[0016] The first exhaust pipe is connected to a first suction pipe, and the end of the first suction pipe away from the first exhaust pipe is connected to a suction module; or, the exhaust end of the carbon dioxide humidity integrated module is connected to a second exhaust pipe, and the end of the second exhaust pipe away from the carbon dioxide humidity integrated module is connected to a suction module.

[0017] Optionally, the first exhaust pipe includes a first pipe section and a second pipe section connected together. The first pipe section is located between the exhaust end of the carbon dioxide humidity integrated module and the connection between the first extraction pipe and the first exhaust pipe. The second pipe section is located between the connection between the first extraction pipe and the first exhaust pipe and the storage chamber. A first valve is provided on the second pipe section, and a second valve is provided on the first extraction pipe.

[0018] Alternatively, a first valve may be installed on the first exhaust pipe, and a second valve may be installed on the second exhaust pipe.

[0019] Optionally, the air inlet of the carbon dioxide humidity integrated module is connected to an air inlet pipe, and a third valve is provided on the air inlet pipe.

[0020] Optionally, the first controlled atmosphere assembly includes a nitrogen-oxygen separation membrane module for separating nitrogen and oxygen, and a second extraction pipeline connected to the nitrogen-oxygen separation membrane module. The nitrogen-oxygen separation membrane module is at least partially located in the storage chamber. One end of the second extraction pipeline away from the nitrogen-oxygen separation membrane module is connected to the extraction module. The extraction module is used to extract oxygen from the storage chamber through the second extraction pipeline and the nitrogen-oxygen separation membrane module.

[0021] Optionally, a fourth valve is provided on the second extraction pipeline.

[0022] Optionally, the moisture-absorbing part and the adsorption part are an integral structure, or the moisture-absorbing part and the adsorption part are separate structures and the moisture-absorbing part is connected to the adsorption part.

[0023] Optionally, the top of the storage chamber is provided with a moisture permeation hole, and a moisture permeation membrane for allowing water vapor to pass through is provided in the moisture permeation hole.

[0024] Optionally, the preservation device further includes an oxygen concentration sensor, a carbon dioxide concentration sensor, and a humidity sensor located in the storage chamber. The oxygen concentration sensor is used to detect the oxygen concentration in the storage chamber, the carbon dioxide concentration sensor is used to detect the carbon dioxide concentration in the storage chamber, and the humidity sensor is used to detect the humidity in the storage chamber.

[0025] This utility model embodiment also discloses a refrigerator, which includes the preservation device described above.

[0026] The present invention has the following advantages:

[0027] The first controlled atmosphere component reduces the oxygen concentration in the storage chamber. The moisture-absorbing section in the second controlled atmosphere component absorbs moisture from the air entering from the outside environment and releases it into the storage chamber, increasing the humidity. Similarly, the adsorption section in the second controlled atmosphere component absorbs and releases carbon dioxide from the air entering from the outside environment, increasing the carbon dioxide concentration in the storage chamber. In other words, this preservation device comprehensively regulates the oxygen, carbon dioxide, and humidity concentrations in the storage chamber, reducing oxygen, increasing carbon dioxide, and humidifying the chamber. This allows fruits and vegetables to be stored in an optimal controlled atmosphere environment, resulting in longer shelf life and better preservation quality. Furthermore, the integrated moisture-absorbing and adsorption sections simplify the overall structure of the preservation device. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a food preservation device provided in an embodiment of the present utility model;

[0029] Figure 2 This is a schematic diagram of the structure of a carbon dioxide humidity integrated module in a preservation device provided in an embodiment of this utility model;

[0030] Figure 3 This is a schematic diagram of the control process for carbon dioxide adsorption and desorption during the use of a preservation device provided in this embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of another preservation device provided in an embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram of the structure of the refrigerator provided in the embodiment of this utility model;

[0033] Figure 6 This is a flowchart illustrating the steps of a method for regulating atmosphere in a refrigerator as provided in this embodiment of the present invention.

[0034] Figure label:

[0035] 1-Storage compartment, 101-Preservation space, 102-Ventilation hole, 2-Carbon dioxide humidity integrated module, 201-Moisture absorption section, 202-Adsorption section, 203-First shell, 3-Lid assembly, 4-First exhaust pipe, 401-First pipe section, 402-Second pipe section, 5-First extraction pipe, 6-Extraction module, 7-Inlet pipe, 8-First valve, 9-Second valve, 10-Third valve, 11-Nitrogen-oxygen separation membrane module, 12-Second extraction pipe, 13-Fourth valve, 14-Moisture permeable membrane, 15-Oxygen concentration sensor, 16-Carbon dioxide concentration sensor, 17-Humidity sensor, 18-Second exhaust pipe, 19-Refrigerator. Detailed Implementation

[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Firstly, referring to Figure 1 , Figure 2 and Figure 4 The preservation device provided in this embodiment of the utility model includes a storage chamber 1, a first modified atmosphere assembly, and a second modified atmosphere assembly. A preservation space 101 is formed in the storage chamber 1. The first modified atmosphere assembly is used to extract oxygen from the storage chamber 1. The second modified atmosphere assembly includes a carbon dioxide humidity integrated module 2 connected to the storage chamber 1. The carbon dioxide humidity integrated module 2 includes a moisture-absorbing part 201 for adsorbing and releasing moisture in the gas entering from the environment outside the storage chamber 1, and an adsorption part 202 for adsorbing and releasing carbon dioxide in the gas entering from the environment outside the storage chamber 1.

[0038] This preservation device can be applied to refrigerators. Modified atmosphere storage technology controls parameters such as temperature, humidity, carbon dioxide concentration, oxygen concentration, and ethylene concentration in the storage environment to inhibit the respiration of fruits and vegetables, slow down the metabolic process, and put them in a dormant state, preventing spoilage and extending their shelf life. Modified atmosphere storage technology is divided into active and passive modified atmosphere storage. Passive modified atmosphere storage relies on the respiration and metabolism of fruits and vegetables to reduce the oxygen concentration in the storage space. This method reduces oxygen concentration slowly and by a small margin, generally only reducing it to about 19%. Active modified atmosphere storage is...

[0039] This preservation device achieves its purpose of oxygen reduction and preservation by artificially lowering the oxygen concentration in the storage space. The oxygen reduction rate of this method is significantly higher than that of passive controlled atmosphere storage. Specifically, this preservation device employs active controlled atmosphere technology.

[0040] The preservation space 101 within storage chamber 1 is used to store fruits and vegetables requiring preservation. The carbon dioxide humidity integration module 2 is specifically located outside storage chamber 1. After the gas from the environment outside storage chamber 1 enters the carbon dioxide humidity integration module 2, the moisture-absorbing part 201 absorbs moisture from the gas and can release moisture under specific conditions, while the adsorption part 202 absorbs carbon dioxide from the gas and can release carbon dioxide under specific conditions. The gas from the environment outside storage chamber 1 can be air. The release of moisture by the moisture-absorbing part 201 and the release of carbon dioxide by the adsorption part 202 can be controlled separately, or the release of moisture by the moisture-absorbing part 201 can be controlled separately, while the adsorption part 202 absorbs or releases carbon dioxide from the gas based on changes in humidity. Specifically, the adsorption part 202 can absorb carbon dioxide from the gas when the humidity is low and release carbon dioxide when the humidity is high.

[0041] Existing active controlled atmosphere (CA) systems typically reduce the oxygen content in the preservation room using air pumps and CA membranes. However, in addition to controlling oxygen levels, CA environments for fruit and vegetable preservation also require controlled carbon dioxide levels. While the carbon dioxide content in the air is generally 0.03%, the CA environment for fruit and vegetable preservation typically requires around 3%. Therefore, the actual carbon dioxide content in CA environments for fruit and vegetable preservation is severely insufficient. Furthermore, during fruit and vegetable preservation, in addition to maintaining certain oxygen and carbon dioxide levels, a certain level of humidity must also be maintained to reduce water loss and wilting. However, during CA processes, air pumps extract both oxygen and moisture, leading to a decrease in humidity after CA treatment. Moreover, when there are fewer fruits and vegetables placed in the preservation room, the humidity is also lower, necessitating the replenishment of humidity.

[0042] In this embodiment of the invention, the first modified atmosphere component can reduce the oxygen concentration in storage chamber 1, and the moisture-absorbing part in the second modified atmosphere component can adsorb moisture from the gas entering from the environment outside storage chamber 1 and release it into storage chamber 1 to increase the humidity of storage chamber 1. The adsorption part in the second modified atmosphere component can adsorb carbon dioxide from the gas entering from the environment outside storage chamber 1 and release it to increase the carbon dioxide concentration in storage chamber 1. In other words, this preservation device can comprehensively regulate the oxygen concentration, carbon dioxide concentration, and humidity in storage chamber 1, reducing the oxygen concentration, increasing the carbon dioxide concentration, and humidifying storage chamber 1, allowing fruits and vegetables to be stored in an optimal modified atmosphere environment, resulting in longer preservation time and better preservation quality.

[0043] In addition, the moisture-absorbing part 201 and the adsorption part 202 are integrated together, which simplifies the overall structure of the preservation device.

[0044] In an optional embodiment of this utility model, reference is made to Figure 2 The carbon dioxide humidity integrated module 2 has an air inlet end that communicates with the environment outside the storage chamber 1 and an exhaust end that communicates with the storage chamber 1. The adsorption part 202 is a variable humidity adsorption part. The moisture absorption part 201 and the variable humidity adsorption part are respectively close to the air inlet end and the exhaust end of the carbon dioxide humidity integrated module. The variable humidity adsorption part is used to adsorb carbon dioxide in the gas flowing through the variable humidity adsorption part when the humidity is less than or equal to the first humidity, and to release carbon dioxide when the humidity of the variable humidity adsorption part is greater than or equal to the second humidity.

[0045] The carbon dioxide humidity integrated module 2 includes an air inlet at its air inlet end and an air outlet at its air outlet end. It also includes a first housing 203, within which a moisture-absorbing part 201 and an adsorption part 202 are disposed. Both the air inlet and the air outlet are located on the first housing 203. The carbon dioxide humidity integrated module 2 adsorbs and releases carbon dioxide from the ambient gas through the variable humidity adsorption part. The second humidity is greater than the first humidity; the first and second humidity levels can be set according to actual needs, and this embodiment does not impose any limitations.

[0046] By altering the partial pressure of water vapor in the environment, the humidification adsorption section enables the adsorption-desorption process of carbon dioxide. The humidification adsorption section can be made of amine-based anion exchange resin. When the humidity of the gas flowing through the humidification adsorption section is less than or equal to a first humidity level, i.e., when the environment in which the humidification adsorption section is located is dry, the basic groups on the surface of the humidification adsorption section adsorb carbon dioxide from the gas. When the humidity in the environment in which the humidification adsorption section is located increases, and increases to a level greater than or equal to a second humidity level, the humidification adsorption section releases carbon dioxide.

[0047] In use, the moisture-absorbing section 201 absorbs moisture from the ambient gas, thereby reducing the gas humidity. When the low-humidity gas passes through the humidification adsorption section, carbon dioxide is adsorbed. When carbon dioxide needs to be released, the moisture in the moisture-absorbing section 201 is controlled to release, thereby increasing the humidity. The humidification adsorption section then releases the high-humidity carbon dioxide, meaning the high-humidity carbon dioxide can be transported to the storage chamber 1 via the carbon dioxide humidity integration module 2. When the humidity and / or carbon dioxide concentration in the storage chamber 1 is low, the carbon dioxide humidity integration module 2 can transport the high-humidity carbon dioxide to the storage chamber 1 to increase the humidity and / or increase the carbon dioxide concentration in the storage chamber 1. In this embodiment, controlling the release of moisture from the moisture-absorbing section 201 increases the humidity at the humidification adsorption section, causing it to release the adsorbed carbon dioxide. This eliminates the need for separate control of the carbon dioxide release from the humidification adsorption section, simplifying the process.

[0048] The structure of the carbon dioxide humidity integrated module 2.

[0049] In an optional embodiment of this utility model, the moisture-absorbing part 201 includes a moisture-absorbing body and a heating component disposed on the moisture-absorbing body. The moisture-absorbing body is used to absorb moisture in the gas flowing through it and release the moisture after the heating component is turned on. The moisture-absorbing body can be made of silicone, and the heating component can be a heating wire. The heating wire heats the moisture-absorbing body when energized and stops heating when the power is off. After the moisture-absorbing body absorbs moisture from the gas, the heating component can be turned on to heat the moisture-absorbing body, after which the moisture-absorbing body releases the moisture. In this embodiment, the moisture in the moisture-absorbing part 201 can be released by heating, which can effectively control the release of moisture from the moisture-absorbing body.

[0050] In an optional embodiment of this invention, the preservation device further includes a third controlled atmosphere component for discharging carbon dioxide from the storage chamber 1. The carbon dioxide humidity integrated module 2 can directly humidify the storage chamber 1. When the humidity in the storage chamber 1 is low, the carbon dioxide humidity integrated module 2 can deliver high-humidity carbon dioxide into the storage chamber 1. If the concentration of carbon dioxide in the storage chamber 1 already meets the requirements, the carbon dioxide in the storage chamber 1 can be discharged through the third controlled atmosphere component to avoid excessively high carbon dioxide concentration caused by humidification alone.

[0051] In an optional embodiment of this utility model, reference is made to Figure 1 and Figure 4 The third controlled atmosphere assembly includes a vent 102 formed on the storage chamber 1, a carbon dioxide permeable membrane (not shown) for carbon dioxide to pass through, and a cover 3 movably connected to the storage chamber 1. The carbon dioxide permeable membrane is disposed in the vent 102, and the cover 3 is used to open or close the vent 102.

[0052] In this system, carbon dioxide permeable membrane allows carbon dioxide to pass through, while oxygen and nitrogen are retained within storage chamber 1. The molecular diameters of carbon dioxide, oxygen, and nitrogen are 0.33 nm, 0.346 nm, and 0.364 nm, respectively. Therefore, when the pore size of the carbon dioxide permeable membrane is around 0.33 nm, a large amount of carbon dioxide can pass through, while most of the oxygen and nitrogen are retained. The oxygen content in the ambient air outside storage chamber 1 is approximately 20.9%, and the carbon dioxide content is approximately 0.03%. Therefore, after opening vent 102, the high concentration of carbon dioxide inside storage chamber 1 will be discharged through the carbon dioxide permeable membrane due to the concentration difference between the inside and outside of storage chamber 1, thus gradually reducing the carbon dioxide concentration within storage chamber 1. In this embodiment, when the carbon dioxide concentration in storage chamber 1 is too high, the excess carbon dioxide can be removed through the opened vent 102 and the carbon dioxide permeable membrane within vent 102, preventing the preservation effect from being affected by excessively high carbon dioxide concentration.

[0053] The cover 3 is connected to a driving member, which drives the cover 3 to move, thereby opening or closing the vent 102. The cover 3 can also be slidably connected to the storage chamber 1; in this case, the driving member drives the cover 3 to slide, thereby opening or closing the vent 102. Alternatively, the cover 3 can be rotatably connected to the storage chamber 1; in this case, the driving member drives the cover 3 to rotate, thereby opening or closing the vent 102.

[0054] In an optional embodiment of this utility model, reference is made to Figure 1 The exhaust end of the carbon dioxide humidity integrated module 2 is connected to the storage chamber 1 through the first exhaust pipe 4; the first exhaust pipe 4 is connected to the first suction pipe 5, and the end of the first suction pipe 5 away from the first pipe section 401 is connected to the suction module 6; or, refer to Figure 4 The exhaust end of the carbon dioxide humidity integrated module 2 is connected to a second exhaust pipe 18, and the end of the second exhaust pipe 18 away from the carbon dioxide humidity integrated module 2 is connected to an air extraction module 6.

[0055] The extraction module 6 is located outside the storage chamber 1. The extraction module 6 can be an extraction pump, which has an extraction port and an exhaust port. The first extraction pipe 5 or the second exhaust pipe 18 is connected to the extraction port of the extraction pump. The extraction module 6 can be located adjacent to the storage chamber 1 or at a location far from it, such as the refrigerator liner or compressor compartment, as long as it can be connected to the first exhaust pipe 4 via the first extraction pipe 5 or to the exhaust end of the carbon dioxide humidity integration module 2 via the second exhaust pipe 18. In this embodiment, the extraction module 6 continuously draws gas from the environment outside the storage chamber 1 into the carbon dioxide humidity integration module 2, allowing the moisture-absorbing part 201 in the carbon dioxide humidity integration module 2 to absorb moisture from the gas, and the adsorption part 202 to adsorb carbon dioxide from the gas.

[0056] In an optional embodiment of this utility model, reference is made to Figure 1 The first exhaust pipe 4 includes a first pipe section 401 and a second pipe section 402 connected together. The first pipe section 401 is located between the exhaust end of the carbon dioxide humidity integrated module 2 and the connection point of the first extraction pipe 5 and the first exhaust pipe 4. The second pipe section 402 is located between the connection point of the first extraction pipe 5 and the first exhaust pipe 4 and the storage chamber 1. A first valve 8 is provided on the second pipe section 402, and a second valve 9 is provided on the first extraction pipe 5; or, refer to Figure 2 A first valve 8 is installed on the first exhaust pipe 4, and a second valve 9 is installed on the second exhaust pipe 18. By controlling the opening and closing of the first valve 8, it is possible to control whether the carbon dioxide released by the carbon dioxide humidity integration module 2 can enter the storage chamber 1. By controlling the opening and closing of the second valve 9, it is possible to control whether the exhaust port of the extraction module 6 can connect with the carbon dioxide humidity integration module 2.

[0057] The exhaust end is connected.

[0058] In an optional embodiment of this utility model, reference is made to Figure 1 and Figure 4 The air inlet of the carbon dioxide humidity integrated module 2 is connected to an air inlet pipe 7, and a third valve 10 is installed on the air inlet pipe 7. The air inlet pipe 7 allows gas from the environment outside the storage chamber 1 to enter the carbon dioxide humidity integrated module 2. By controlling the opening and closing of the third valve 10, it is possible to control whether gas from the environment outside the storage chamber 1 can enter the carbon dioxide humidity integrated module 2.

[0059] Reference Figure 3When the carbon dioxide humidity integrated module 2 is working, firstly, the exhaust module 6 is turned on, and the third valve 10 and the second valve 9 are turned on. Under the action of the exhaust module 6, the gas in the environment outside the storage chamber 1 is continuously drawn into the carbon dioxide humidity integrated module 2. When the gas passes through the moisture absorption section 201, the moisture is absorbed and the gas becomes low-humidity gas. After passing through the humidification adsorption section, the carbon dioxide in the low-humidity gas is adsorbed. Then, the third valve 10 and the second valve 9 are closed, and the heating component is turned on to heat the moisture absorption body, causing the moisture in the moisture absorption body to be released. At this time, the humidity around the humidification adsorption section increases, and the carbon dioxide previously adsorbed by the humidification adsorption section is desorbed. Then, the high-humidity carbon dioxide is transported into the storage chamber 1 through the first exhaust pipe 4.

[0060] In an optional embodiment of this utility model, reference is made to Figure 1 and Figure 4 The first controlled atmosphere assembly includes a nitrogen-oxygen separation membrane module 11 for separating nitrogen and oxygen, and a second extraction pipeline 12 connected to the nitrogen-oxygen separation membrane module 11. The nitrogen-oxygen separation membrane module 11 is at least partially located in the storage chamber 1. One end of the second extraction pipeline 12 away from the nitrogen-oxygen separation membrane module 11 is connected to an extraction module 6. The extraction module 6 is used to extract oxygen from the storage chamber 1 through the second extraction pipeline 12 and the nitrogen-oxygen separation membrane module 11.

[0061] The nitrogen-oxygen separation membrane module 11 includes a nitrogen-oxygen separation membrane for separating nitrogen and oxygen. The module may also include a second housing, in which the nitrogen-oxygen separation membrane is disposed. The second housing has an inlet and an outlet, and a second extraction pipe 12 is connected to the outlet. The inlet is located inside the storage chamber 1. During use, at least the side of the nitrogen-oxygen separation membrane module 11 that blocks nitrogen flow should be located inside the storage chamber 1; alternatively, the entire nitrogen-oxygen separation membrane module 11 can be located within the storage chamber 1.

[0062] The extraction module 6 acts on the nitrogen-oxygen separation membrane module 11 through the second extraction pipe 12. The nitrogen-oxygen separation membrane module 11 only allows oxygen to pass through, while nitrogen remains in the storage chamber 1. The oxygen separated by the nitrogen-oxygen separation membrane module 11 is discharged to the outside space through the second extraction pipe 12 and the extraction module 6.

[0063] When storage chamber 1 needs to reduce oxygen, the fourth valve 13 will open. Under the action of the extraction module 6, the oxygen in storage chamber 1 will be extracted through the nitrogen-oxygen separation membrane module 11, while the nitrogen will be trapped in storage chamber 1.

[0064] In an optional embodiment of this utility model, reference is made to Figure 1 and Figure 4A fourth valve 13 is installed on the second extraction pipeline 12. By controlling the opening and closing of the fourth valve 13, it is possible to control whether the extraction port of the extraction module 6 can be connected to the nitrogen-oxygen separation membrane module 11.

[0065] In one optional embodiment of this utility model, the moisture-absorbing part 201 and the adsorption part 202 are an integral structure, or the moisture-absorbing part 201 and the adsorption part 202 are separate structures connected to each other. When the moisture-absorbing part 201 and the adsorption part 202 are separate structures, the connection method between them can be adhesive, snap-fit, etc. When the moisture-absorbing part 201 and the adsorption part 202 are an integral structure, it facilitates the overall assembly of the moisture-absorbing part 201 and the adsorption part 202. When the moisture-absorbing part 201 and the adsorption part 202 are separate structures, the assembly position of the moisture-absorbing part 201 and the adsorption part 202 can be adjusted according to different assembly requirements.

[0066] In an optional embodiment of this utility model, reference is made to Figure 5 The top of the storage chamber 1 is provided with a moisture permeation hole, and a moisture permeation membrane 14 is provided inside the moisture permeation hole for water vapor to pass through. The moisture permeation membrane 14 allows water vapor to diffuse from high humidity areas to low humidity areas, thereby enabling the humidity in the storage chamber 1 to be maintained within the required humidity range.

[0067] In an optional embodiment of this utility model, reference is made to Figure 1 and Figure 4 The preservation device also includes an oxygen concentration sensor 15, a carbon dioxide concentration sensor 16, and a humidity sensor 17 located in the storage chamber 1. The oxygen concentration sensor 15 is used to detect the oxygen concentration in the storage chamber 1, the carbon dioxide concentration sensor 16 is used to detect the carbon dioxide concentration in the storage chamber 1, and the humidity sensor 17 is used to detect the humidity in the storage chamber 1. In this embodiment, the oxygen concentration sensor 15, carbon dioxide concentration sensor 16, and humidity sensor 17 can detect the oxygen concentration, carbon dioxide concentration, and humidity in the storage chamber 1 in real time, so as to control the operation of each component in the preservation device according to the oxygen concentration, carbon dioxide concentration, and humidity in the storage chamber 1.

[0068] Secondly, referring to Figure 5 This utility model provides a refrigerator 19, which includes the preservation device provided in the first aspect. The preservation device includes a storage compartment 1, a first modified atmosphere assembly, and a second modified atmosphere assembly. A preservation space 101 is formed in the storage compartment 1. The first modified atmosphere assembly is used to extract oxygen from the storage compartment 1. The second modified atmosphere assembly includes a carbon dioxide humidity integration device connected to the storage compartment 1.

[0069] Module 2, the carbon dioxide humidity integrated module 2 includes a moisture-absorbing section 201 for adsorbing and releasing moisture from the gas entering from the environment outside the storage chamber 1, and an adsorption section 202 for adsorbing and releasing carbon dioxide from the gas entering from the environment outside the storage chamber 1.

[0070] The carbon dioxide humidity integrated module 2 has an air inlet communicating with the environment outside the storage chamber 1 and an exhaust end communicating with the storage chamber 1. The adsorption section 202 is a humidification adsorption section, with the moisture absorption section 201 and the humidification adsorption section located near the air inlet and exhaust ends of the carbon dioxide humidity integrated module, respectively. The humidification adsorption section is used to adsorb carbon dioxide in the gas flowing through it when the humidity is less than or equal to a first humidity, and to release carbon dioxide when the humidity of the humidification adsorption section is greater than or equal to a second humidity. The moisture absorption section 201 includes a moisture absorption body and a heating element disposed on the moisture absorption body. The moisture absorption body is used to adsorb moisture in the gas flowing through it and to release moisture after the heating element is turned on. The refrigerator 19 includes a control module electrically connected to the heating element to control the turning on and off of the heating element. The control module can be a processor.

[0071] The preservation device also includes a third modified atmosphere assembly for removing carbon dioxide from the storage compartment 1. The third modified atmosphere assembly includes a vent 102 formed in the storage compartment 1, a carbon dioxide permeable membrane (not shown) for carbon dioxide to pass through, and a cover 3 movably connected to the storage compartment 1. The carbon dioxide permeable membrane is disposed within the vent 102, and the cover 3 is used to open or close the vent 102. A drive member is connected to the cover 3, which drives the cover 3 to move, thereby opening or closing the vent 102. The refrigerator 19 also includes a wireless controller, which is wirelessly connected to the drive member. The wireless controller sends control signals to the drive member to control its operation.

[0072] The air inlet of the carbon dioxide humidity integrated module 2 is connected to an air inlet pipe 7, and a third valve 10 is installed on the air inlet pipe 7. The exhaust end of the carbon dioxide humidity integrated module 2 is connected to the storage chamber 1 through a first exhaust pipe 4; the first exhaust pipe 4 is connected to a first suction pipe 5, and the end of the first suction pipe 5 away from the first pipe section 401 is connected to a suction module 6; or, refer to Figure 4 The exhaust end of the carbon dioxide humidity integrated module 2 is connected to a second exhaust pipe 18, and the end of the second exhaust pipe 18 away from the carbon dioxide humidity integrated module 2 is connected to an air extraction module 6.

[0073] In an optional embodiment of this utility model, reference is made to Figure 1 The first exhaust pipe 4 includes a first pipe section 401 and a second pipe section 402 connected together. The first pipe section 401 is located between the exhaust end of the carbon dioxide humidity integrated module 2 and the connection point between the first extraction pipe 5 and the first exhaust pipe 4. The second pipe section 402...

[0074] 402 is located between the connection point of the first extraction pipe 5 and the first exhaust pipe 4 and the storage chamber 1. A first valve 8 is installed on the second pipe section 402, and a second valve 9 is installed on the first extraction pipe 5; or, refer to Figure 2 A first valve 8 is installed on the first exhaust pipe 4, and a second valve 9 is installed on the second exhaust pipe 18.

[0075] The first controlled atmosphere assembly includes a nitrogen-oxygen separation membrane module 11 for separating nitrogen and oxygen, and a second extraction pipeline 12 connected to the nitrogen-oxygen separation membrane module 11. The nitrogen-oxygen separation membrane module 11 is at least partially located within the storage chamber 1. The end of the second extraction pipeline 12 away from the nitrogen-oxygen separation membrane module 11 is connected to an extraction module 6, which is used to extract oxygen from the storage chamber 1 through the second extraction pipeline 12 and the nitrogen-oxygen separation membrane module 11. A fourth valve 13 is provided on the second extraction pipeline 12.

[0076] The preservation device also includes an oxygen concentration sensor 15, a carbon dioxide concentration sensor 16, and a humidity sensor 17 located in the storage chamber 1. The oxygen concentration sensor 15 is used to detect the oxygen concentration in the storage chamber 1, the carbon dioxide concentration sensor 16 is used to detect the carbon dioxide concentration in the storage chamber 1, and the humidity sensor 17 is used to detect the humidity in the storage chamber 1.

[0077] The control module in refrigerator 19 is electrically connected to oxygen concentration sensor 15, carbon dioxide concentration sensor 16, and humidity sensor 17 to obtain the oxygen concentration detected by oxygen concentration sensor 15, the carbon dioxide concentration detected by carbon dioxide concentration sensor 16, and the humidity detected by humidity sensor 17. The control module in refrigerator 19 is also electrically connected to first valve 8, second valve 9, third valve 10, and fourth valve 13 to control the opening and closing of first valve 8, second valve 9, third valve 10, and fourth valve 13.

[0078] The aforementioned preservation device can take the form of a preservation drawer, which is pull-out and installed inside the refrigerator 19. The preservation drawer can be located in the refrigerator compartment of the refrigerator 19. The refrigerator 19 has a front door, and the nitrogen-oxygen separation membrane module and the third controlled atmosphere assembly are preferably located on the rear side of the storage compartment 1 away from the front door. The carbon dioxide humidity integration module 2 and the air extraction module 6 are preferably located at the bottom of the refrigerator 19. The refrigerator 19 has a touch screen display, which is electrically connected to the control module, and the food stored in the preservation drawer can be selected or entered through the display.

[0079] Reference Figure 6 The method for regulating atmosphere using the refrigerator provided in this embodiment of the present invention may include:

[0080] S1. Select or input the food items to be stored via the refrigerator's display screen; S2. The control module determines the oxygen and carbon dioxide concentration ranges based on the stored food items by retrieving data from a database; S3. Detect whether the crisper drawer is closed; if the crisper drawer is not closed, then S4. Control the air extraction module to close; if the crisper drawer is closed, then S5. Control the air extraction module to open; then S6. Determine if the oxygen concentration is ≤C1; if the oxygen concentration is not ≤C1, then S7. Control the fourth valve to open; if the oxygen concentration is ≤C1, then S8. Control the fourth valve to close; then S9. Determine if the carbon dioxide concentration is ≥C2; if the carbon dioxide concentration is not ≥C2, then S10. Control the first valve to open and control the lid to close the vent; if the carbon dioxide concentration is ≥C2, then S11. Determine if the humidity is <H0; if the humidity is <H0, then S12. Control the first valve to open and control the lid to open the vent; if the humidity is not <H0, then S13. Control the first valve to close and control the lid to close the vent.

[0081] First, the user selects or inputs the food items to be stored via the refrigerator's display screen. The control module receives the information and determines the appropriate oxygen and carbon dioxide concentration ranges based on the selected food items. It should be noted that if storing a single food item, the item can be selected or input via the display screen. The database stores the correspondence between different food items and suitable oxygen and carbon dioxide concentration ranges. The suitable oxygen and carbon dioxide concentration ranges for storing different fruits and vegetables are shown in Tables 1 and 2.

[0082] Table 1

[0083] Fruit Name Oxygen concentration (%) Carbon dioxide concentration (%) apple 2～5 2～5 pear 3～5 1～3 Peach 3～5 3～5 kiwi 4～5 1～2 cherry 2～3 7～10 Grape 2～3 2～3 strawberry 8～10 5～10 litchi 3～6 2～5 Longan 6～8 2～5 date 3～6 3～5 cantaloupe 3～5 1～1.5 Plum 3～5 2～5

[0084] Table 2

[0085] Vegetable Names Oxygen concentration (%) Carbon dioxide concentration (%) celery 13～14 7～8 cucumber 2～5 2～5 carrot 1～3 5～7 Green pepper 2～5 2～5 tomato 2～4 2～4 cauliflower 2～4 6～8 spinach 12～16 4～5 Garlic scapes 2～5 3～8 potato 3～5 2～3 lettuce 3～5 5～7

[0086] It should be noted that if storing multiple types of food, a universal oxygen and carbon dioxide concentration range can be selected on the display screen. In this case, the control module can directly receive the oxygen and carbon dioxide concentration ranges. The universal oxygen concentration range can be 3% to 6%, and the universal carbon dioxide concentration range can be 1% to 3%.

[0087] Before modified atmosphere storage, the vacuum module 6 is activated, along with the third valve 10 and the second valve 9. Under the action of the vacuum module 6, air from the environment outside the storage compartment 1 is continuously drawn into the carbon dioxide humidity integrated module 2. As the air passes through the moisture absorption section 201, moisture is absorbed, resulting in a low-humidity gas. After passing through the humidification adsorption section, carbon dioxide in the low-humidity gas is adsorbed, ensuring that the carbon dioxide humidity integrated module 2 adsorbs sufficient moisture and carbon dioxide beforehand. To detect whether the crisper drawer is closed, a sensor or other circuit switch can be used. If the crisper drawer is not closed, the vacuum module is deactivated, and the user is reminded to close the crisper drawer via the refrigerator 19's display screen to ensure the airtightness of the storage compartment 1.

[0088] If the refrigerator drawer is closed, the extraction module 6 is activated and begins operation. Simultaneously, the fourth valve 13 is opened, while the other valves remain closed. At this time, the extraction module...

[0089] Block 6 extracts oxygen from the preservation space 101 through the second extraction pipe 12 and the nitrogen-oxygen separation membrane module 11 to reduce oxygen levels. The oxygen concentration in the storage chamber 1 is detected by the oxygen concentration sensor 15. When the oxygen concentration is less than or equal to C1, the fourth valve 13 is closed, and oxygen reduction stops. Here, C1 is the upper limit of the oxygen concentration range determined by the control module. Then, the carbon dioxide concentration in the storage chamber 1 is detected by the carbon dioxide concentration sensor 16. When the carbon dioxide concentration is less than C2, the first valve 8 is opened, the heating element is activated, and the cover 3 closes the vent 102. At this time, because the oxygen in the storage chamber 1 is extracted, a negative pressure is formed inside the storage chamber 1. When the first valve 8 is opened, the highly humid carbon dioxide released by the carbon dioxide humidity integration module 2 is released into the storage chamber 1 under pressure. Here, C2 is the lower limit of the carbon dioxide concentration determined by the control module.

[0090] When the concentration of carbon dioxide is greater than or equal to C2, the humidity sensor 17 detects the humidity in storage chamber 1. If the humidity is less than H0, high-humidity carbon dioxide continues to be released into storage chamber 1, and the lid 3 is controlled to open the vent 102 to allow excess carbon dioxide to be discharged through the carbon dioxide permeable membrane within the vent 102. Here, H0 is the minimum humidity limit required to achieve preservation, and H0 can be 80%. When the humidity in storage chamber 1 is greater than or equal to H0, the first valve 8 is controlled to close, and the lid 3 is controlled to close the vent 102.

[0091] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0092] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0093] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0094] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

[0095] The preservation device and refrigerator provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the structure and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A freshness keeping device characterized by comprising: The fresh-keeping device comprises: a storage chamber, a fresh-keeping space being formed in the storage chamber; a first gas adjusting assembly for extracting oxygen from the storage chamber; a second gas adjusting assembly comprising a carbon dioxide and humidity integrated module in communication with the storage chamber, the carbon dioxide and humidity integrated module comprising a humidity absorbing portion for absorbing and releasing moisture in gas entering from the environment outside the storage chamber and an adsorbing portion for absorbing and releasing carbon dioxide in gas entering from the environment outside the storage chamber.

2. The fresh keeping apparatus according to claim 1, wherein The carbon dioxide and humidity integrated module has an air inlet end in communication with the environment outside the storage chamber and an air outlet end in communication with the storage chamber, the adsorbing portion is a humidity variable adsorbing portion, and the humidity absorbing portion and the humidity variable adsorbing portion are respectively close to the air inlet end and the air outlet end of the carbon dioxide and humidity integrated module. The humidity variable adsorbing portion is used for adsorbing carbon dioxide in gas with humidity less than or equal to a first humidity flowing through the humidity variable adsorbing portion and releasing carbon dioxide when the humidity of the humidity variable adsorbing portion is greater than or equal to a second humidity.

3. The freshness keeping apparatus according to claim 2, wherein The humidity absorbing portion comprises a humidity absorbing body and a heating component arranged on the humidity absorbing body, the humidity absorbing body being used for absorbing and releasing moisture in gas flowing through the humidity absorbing body.

4. The fresh keeping apparatus according to claim 2, wherein The fresh-keeping device further comprises a third gas adjusting assembly for discharging carbon dioxide in the storage chamber.

5. The apparatus of claim 4, wherein The third gas adjusting assembly comprises a gas permeable hole opened on the storage chamber, a carbon dioxide permeable membrane for allowing carbon dioxide to permeate, and a cover member movably connected to the storage chamber, the carbon dioxide permeable membrane being arranged in the gas permeable hole, and the cover member being used for opening or covering the gas permeable hole.

6. The freshness keeping apparatus according to any one of claims 2 to 5, characterized by The air outlet end of the carbon dioxide and humidity integrated module is in communication with the storage chamber through a first air outlet pipeline. The first air outlet pipeline is connected with a first air extraction pipeline, one end of the first air extraction pipeline away from the first air outlet pipeline being connected with an air extraction module; or, the air outlet end of the carbon dioxide and humidity integrated module is in communication with a second air outlet pipeline, one end of the second air outlet pipeline away from the carbon dioxide and humidity integrated module being connected with an air extraction module. The first air outlet pipeline comprises a first pipeline segment and a second pipeline segment connected in series, the first pipeline segment being located between the air outlet end of the carbon dioxide and humidity integrated module and the connection between the first air extraction pipeline and the first air outlet pipeline, the second pipeline segment being located between the connection between the first air extraction pipeline and the first air outlet pipeline and the storage chamber, a first valve being arranged on the second pipeline segment, and a second valve being arranged on the first air extraction pipeline.

7. The apparatus of claim 6, wherein Alternatively, a first valve is arranged on the first air outlet pipeline, and a second valve is arranged on the second air outlet pipeline. The air inlet end of the carbon dioxide and humidity integrated module is in communication with an air inlet pipeline, and a third valve is arranged on the air inlet pipeline.

8. The fresh keeping apparatus according to claim 6, wherein ​ 9. The freshness keeping apparatus according to claim 6, wherein The first air-conditioning assembly comprises a nitrogen-oxygen separation membrane module for separating nitrogen and oxygen, and a second air extraction pipeline connected to the nitrogen-oxygen separation membrane module, wherein the nitrogen-oxygen separation membrane module is at least partially located in the storage chamber, and the second air extraction pipeline is connected to the air extraction module at an end away from the nitrogen-oxygen separation membrane module, and the air extraction module is used to extract oxygen in the storage chamber through the second air extraction pipeline and the nitrogen-oxygen separation membrane module.

10. The freshness keeping device according to claim 9, wherein A fourth valve is arranged on the second air extraction pipeline.

11. The freshness keeping apparatus according to any one of claims 1 to 5, characterized by The moisture absorption part and the adsorption part are in an integrated structure, or the moisture absorption part and the adsorption part are in a split structure and are connected to each other.

12. The freshness keeping apparatus according to any one of claims 1 to 5, characterized by A moisture-permeable hole is formed at the top of the storage chamber, and a moisture-permeable film for allowing water vapor to pass through is arranged in the moisture-permeable hole.

13. The freshness keeping apparatus according to any one of claims 1 to 5, characterized by The fresh-keeping device further comprises an oxygen concentration sensor, a carbon dioxide concentration sensor, and a humidity sensor arranged in the storage chamber, wherein the oxygen concentration sensor is used to detect the oxygen concentration in the storage chamber, the carbon dioxide concentration sensor is used to detect the carbon dioxide concentration in the storage chamber, and the humidity sensor is used to detect the humidity in the storage chamber.

14. A refrigerator characterized by comprising: The fresh-keeping device comprises any one of claims 1 to 13.

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