A refrigerator

Abstract

The application discloses a refrigerator, which has at least one drawer, a closed storage area for storing fruits and vegetables is formed in the drawer, a heating part is used for adjusting the temperature in the storage area, a moisture-permeable film is arranged on the drawer, which is used for allowing the moisture in the storage area to flow out to the outside unidirectionally when the humidity in the storage area is greater than the humidity outside, so as to adjust the humidity in the storage area, an ethylene removal part is used for removing ethylene in the storage area, a weight sensor is used for acquiring the weight of the fruits and vegetables in the storage area, and an O2 or CO2 concentration sensor is used for acquiring the O2 or CO2 concentration in the storage area. According to the acquired weight of the fruits and vegetables and the O2 or CO2 concentration in the storage area, the system analyzes and calculates the respiration intensity of the fruits and vegetables. The system judges the maturity of the fruits and vegetables according to the respiration intensity, so as to control the operation of the heating part and the ethylene removal part, accelerate the maturity of unripe fruits and vegetables, prolong the fresh-keeping storage time of ripe fruits and vegetables, and improve the storage effect of the fruits and vegetables.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a refrigerator. Background Art

[0002] Tropical fruits are generally grown in tropical regions. Because they are picked when ripe, they can overripen and rot during transportation. Therefore, they are typically harvested immature and ripened using chemical methods before being sold to consumers. As tropical fruits mature, their flavor compounds and sweetness increase. However, tropical fruits have an optimal maturity. Overripeness causes their color and appearance to diminish, leading to their decline. Therefore, tropical fruits only reach their optimal taste and nutritional quality at a specific point in their maturity.

[0003] In the sales process, most vendors ripen tropical fruits themselves, and the degree of ripening is difficult to control to the optimal maturity. Therefore, the maturity of tropical fruits purchased by consumers is also inconsistent. It is not easy for ordinary consumers to wait until the tropical fruits are at the optimal maturity and taste the best taste and flavor.

[0004] It's difficult for consumers to control the maturity of tropical fruits at home. At room temperature, fruits quickly overripen, and the low temperatures of refrigerators can cause chilling damage. Even if consumers keep them at the ideal storage temperature of 10-15°C, which is ideal for most tropical fruits, it's difficult to achieve optimal ripeness and maximize the duration of the fruit's peak ripeness simply by keeping the temperature.

[0005] The above information disclosed in this background technology is only used to increase the understanding of the background technology of this application. Therefore, it may contain information that does not constitute the prior art known to ordinary technicians in this field. Summary of the Invention

[0006] In response to the problems pointed out in the background technology, the present invention proposes a refrigerator that analyzes and calculates the maturity of fruits and vegetables by analyzing the weight of stored fruits and vegetables and the changes in O2 or CO2 concentration in the storage space, and controls the operation of related components accordingly to improve the storage effect of fruits and vegetables.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0008] In some embodiments of the present application, a refrigerator is provided, which has at least one drawer, wherein a closed storage area for storing fruits and vegetables is formed in the drawer;

[0009] The heating unit is used to adjust the temperature in the storage area;

[0010] The drawer is provided with a moisture-permeable membrane, which is used to allow the moisture in the storage area to flow out in one direction to the outside when the humidity in the storage area is higher than the external humidity, so as to adjust the humidity in the storage area;

[0011] The ethylene removal section is used to remove ethylene in the storage area;

[0012] The weight sensor is used to obtain the weight of fruits and vegetables in the storage area;

[0013] The O2 or CO2 concentration sensor is used to obtain the O2 or CO2 concentration in the storage area;

[0014] The system analyzes and calculates the respiration intensity of fruits and vegetables based on the weight of fruits and vegetables in the storage area and the O2 or CO2 concentration. The system determines the maturity of fruits and vegetables based on the respiration intensity and controls the operation of the heating part and the ethylene removal part.

[0015] This application analyzes and calculates the maturity of fruits and vegetables by analyzing the weight of stored fruits and vegetables and the changes in O2 or CO2 concentration in the storage space, and controls the operation of related components accordingly, thereby accelerating the ripening of immature fruits and vegetables and extending the fresh-keeping storage time of mature fruits and vegetables, thereby improving the storage effect of fruits and vegetables.

[0016] In some embodiments of the present application, fruits and vegetables have a suitable storage temperature range and a chilling injury critical temperature range;

[0017] When the system analysis shows that the fruits and vegetables have not reached the optimal maturity, the refrigerator enters the ripening mode, the heating unit is turned on or off according to the temperature in the storage area to keep the temperature in the storage area within the suitable storage temperature range, and the ethylene removal unit is turned off;

[0018] When the system analysis shows that the fruits and vegetables have reached the optimal maturity, the refrigerator enters the fresh-keeping mode, the heating unit is turned on or off according to the temperature in the storage area so that the temperature in the storage area is within the critical temperature range of chilling damage, and the ethylene removal unit is turned on.

[0019] In some embodiments of the present application, the heating part is arranged on the inner wall of the storage space where the drawer is located, and is used to adjust the temperature of the storage space where the drawer is located. The heating part includes a heating wire, a heat reflecting layer, and a heat insulating layer. The heat insulating layer is arranged on the inner wall, the heat reflecting layer is arranged on the heat insulating layer, and the heating wire is arranged on the heat reflecting layer.

[0020] In some embodiments of the present application, an air cavity connected to the refrigeration air duct of the refrigerator is provided on the rear wall of the inner container of the storage space where the drawer is located. A refrigeration fan is provided in the air cavity, and an air outlet and an air return port are provided on the side of the air cavity facing the storage space.

[0021] The cooling fan is turned on when the temperature in the storage area reaches a set temperature upper limit value or above.

[0022] In some embodiments of the present application, the moisture permeable membrane and the internal dehumidification fan are provided on the top wall of the drawer, the internal dehumidification fan is arranged close to the moisture permeable membrane, the internal dehumidification fan is arranged on the inner side of the top wall of the drawer, and the internal dehumidification fan is used to discharge the air in the storage area to the outside.

[0023] In some embodiments of the present application, a magnetic sensitive portion is provided on the inner side of the internal dehumidification fan, and the magnetic sensitive portion has an extension portion extending outward from the internal dehumidification fan, and the extension portion extends toward the moisture permeable membrane. An electromagnetic coil is provided above the extension portion, and the extension portion is displaced toward the direction close to the electromagnetic coil under the magnetic action generated by the electromagnetic coil.

[0024] In some embodiments of the present application, the electromagnetic coil has multiple levels of operating power, and the operating power of the electromagnetic coil increases as the humidity in the storage area increases.

[0025] In some embodiments of the present application, an external dehumidification fan is provided on the outside of the top wall of the drawer, and the external dehumidification fan is arranged close to the moisture permeable membrane. The internal dehumidification fan and the external dehumidification fan are used to operate at different speeds to adjust the water vapor pressure difference between the inner and outer sides of the moisture permeable membrane, and adjust the rate at which moisture in the storage area flows out through the moisture permeable membrane.

[0026] In some embodiments of the present application, a humidifying water box is provided in the storage area for adjusting the humidity in the storage area;

[0027] The humidifying water box has a cooling unit for cooling the water in the humidifying water box, and the cooling unit is turned on when the temperature of the water in the humidifying water box reaches or exceeds the measured temperature value in the storage area.

[0028] In some embodiments of the present application, the cooling unit is a cooling fan provided in the humidifying water box; or,

[0029] The vent is provided on the drawer and connected to the humidifying water box. The vent is connected to the refrigeration air duct of the refrigerator. The vent is used to transport cold air into the humidifying water box to cool the water in the humidifying water box. The vent is provided with a damper for closing and opening the vent.

[0030] Other features and advantages of the present invention will become more apparent after reading the detailed description of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 List of storage conditions for major tropical fruits and vegetables;

[0033] Figure 2 For the storage method of tropical fruits and vegetables in the refrigerator according to the embodiment;

[0034] Figure 3 is a structural schematic diagram of a refrigerator according to an embodiment;

[0035] Figure 4 is a structural schematic diagram of a drawer according to an embodiment;

[0036] Figure 5 for Figure 4 The structure shown is a schematic diagram of the structure observed from the Q direction;

[0037] Figure 6 is a schematic structural diagram of a drawer top cover according to an embodiment as viewed from the inside;

[0038] Figure 7 This is a schematic structural diagram of a heating portion provided on the inner container wall according to an embodiment;

[0039] Figure 8 is a schematic structural diagram of a heating unit according to an embodiment;

[0040] Figure 9 is a control flow chart of the heating unit according to an embodiment;

[0041] Figure 10 is a structural schematic diagram of a drawer according to another embodiment;

[0042] Figure 11 A flow chart of temperature control for a drawer storage area cooling fan combined with a heating unit according to an embodiment;

[0043] Figure 12 A flow chart of humidity control incorporating dehumidification fans inside and outside the drawer storage area according to an embodiment;

[0044] Figure 13 is a top view of a drawer according to an embodiment;

[0045] Figure 14 A flowchart of the humidifying unit start control according to an embodiment;

[0046] Figure 15is a side view of a drawer top cover according to another embodiment;

[0047] Figure 16 for Figure 15 a bottom view of the drawer top shown;

[0048] Figure 17 Schematic diagram of the relative positions of the internal dehumidification fan, the magnetic sensitive part, and the electromagnetic coil according to an embodiment;

[0049] Figure 18 for Figure 17 Schematic diagram of the structure after the magnetic sensitive part of the structure is displaced;

[0050] Figure 19 The control process of the refrigerator according to the embodiment based on the maturity of fruits and vegetables and the respiration intensity Figure 1 ;

[0051] Figure 20 The control process of the refrigerator according to the embodiment based on the maturity of fruits and vegetables and the respiration intensity Figure 2 ;

[0052] Reference numerals:

[0053] 10- cabinet, 11- control screen;

[0054] 20-Inner tank, 21-Air outlet, 22-Return air outlet, 23-Storage space;

[0055] 100- drawer, 110- drawer body, 120- top cover, 130- storage area;

[0056] 200-heating part, 210-heating wire, 220-heat reflecting layer, 230-insulating layer;

[0057] 300-humidification unit, 310-air door;

[0058] 400-moisture permeable film;

[0059] 510-internal dehumidification fan, 520-external dehumidification fan;

[0060] 600-ethylene removal unit;

[0061] 700-temperature sensor;

[0062] 810 - magnetically sensitive portion, 811 - extending portion, 820 - electromagnetic coil. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0064] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply 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 a limitation on this application.

[0065] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0066] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0067] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0068] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0069] [refrigerator]

[0070] Reference Figure 3 The refrigerator of this embodiment has a roughly rectangular parallelepiped shape. Its exterior is defined by a storage compartment defining a storage space and multiple doors disposed within the compartment. An inner container 20 is located within the housing 10, enclosing multiple storage spaces 23 for storing items. The temperature and humidity within each storage space are controllable to accommodate different types of items.

[0071] One of the key research directions of the refrigerator in this embodiment is to improve the storage effect of tropical fruits and vegetables, including using a ripening mode to store unripe tropical fruits and vegetables to achieve optimal maturity; and using a fresh-keeping mode to store ripe tropical fruits and vegetables so that they are stored in an optimal temperature and humidity environment to extend the fresh-keeping storage time.

[0072] The best storage conditions for common tropical fruits and vegetables are as follows: Figure 1 As shown, Figure 1 The critical temperature, suitable temperature, and symptoms of chilling injury for common tropical fruits and vegetables are shown in the table.

[0073] Classify each type of fruit and vegetable according to its critical temperature for chilling injury and suitable storage humidity, and determine the storage mode, storage temperature, and storage humidity for each type of fruit and vegetable.

[0074] For example, the critical temperature range for chilling damage to bananas is 11.7-13.3℃, ​​that is, when the storage temperature is lower than this range, bananas are prone to chilling damage, resulting in water-soaked dark green patches on the peel, brown stripes inside the skin, hardening of the central placenta, and delayed ripening. The suitable storage humidity for bananas is 90-95%. When the storage humidity is too higher than this range, it is easy to cause condensation in the compartment, soaking of the surface of fruits and vegetables, and other phenomena, accelerating the decay of fruits and vegetables. When the storage humidity is lower than this range, it is easy to cause bananas to lose water and weight, reducing the freshness of the fruit.

[0075] according to Figure 1The chilling temperature range and suitable storage humidity range of tropical fruits and vegetables are shown in the figure. The refrigerator can store tropical fruits and vegetables in three modes: warm storage mode, warm storage mode, and cold storage mode. Figure 2 shown.

[0076] Bananas, mangoes, lemons, tomatoes, sweet potatoes, and avocados are suitable for storage in warm storage mode, with a storage temperature of about 15-12°C and a storage humidity of 90-95%;

[0077] Zucchini, pumpkin, cucumber, winter melon, melon, cabbage, and citrus fruits are suitable for warm storage mode, with a storage temperature of about 12-9°C and a storage humidity of 85-90%;

[0078] Bell peppers, green peppers, beans, eggplants, rambutans, and papayas are suitable for storage in refrigerated mode, with a storage temperature of about 9-6°C and a storage humidity of 80-85%.

[0079] The refrigerator in this embodiment further has at least one drawer 100. Figure 3 The middle drawer 100 is in a pulled-out state. The drawer 100 is disposed in the storage space 23 . A closed storage area 130 for storing tropical fruits and vegetables is formed in the drawer 100 .

[0080] The drawer 100 is used to provide a special storage area for tropical fruits and vegetables. By adjusting the temperature and humidity in the storage area 130, the optimal storage temperature and humidity are provided for the tropical fruits and vegetables, thereby improving the storage effect.

[0081] Temperature regulation specifically includes temperature rise control and temperature drop control.

[0082] Humidity regulation specifically includes increasing humidity control and decreasing humidity control.

[0083] In some embodiments of the present application, the drawer 100 generally does not store a single type of tropical fruit or vegetable, but rather stores multiple types of tropical fruits and vegetables mixed together. The refrigerator's control method for storing multiple types of tropical fruits and vegetables mixed together is as follows:

[0084] When all the tropical fruits and vegetables in the storage area belong to the types of fruits and vegetables corresponding to the warm storage mode, the warm storage mode, or the refrigerated mode, the temperature and humidity in the storage area are adjusted to the temperature range and humidity range of the warm storage mode, the warm storage mode, or the refrigerated mode corresponding to the tropical fruits and vegetables.

[0085] When the tropical fruits and vegetables in the storage area belong to the types of fruits and vegetables corresponding to two or three of the warm storage mode, the temperature and humidity in the storage area are adjusted based on the data of the smaller temperature range and humidity range.

[0086] For example, when only fruits and vegetables corresponding to the "refrigerated mode" are stored in the storage area, the temperature of the storage area is adjusted to level 1, the storage temperature is adjusted to 9-6°C, and the humidity is adjusted to 80-85%;

[0087] If only fruits and vegetables corresponding to "warm storage mode" are stored in the storage area, or if there are fruits and vegetables corresponding to "refrigerated mode" and fruits and vegetables corresponding to "warm storage mode", the storage area temperature is adjusted to level 2, the storage temperature is adjusted to 12-9°C, and the humidity is adjusted to 85-90%;

[0088] When the storage area only stores fruits and vegetables corresponding to the "warm storage mode", or there are fruits and vegetables corresponding to the "cold storage mode" and fruits and vegetables corresponding to the "warm storage mode", or there are fruits and vegetables corresponding to the "warm storage mode" and fruits and vegetables corresponding to the "warm storage mode", or there are fruits and vegetables corresponding to the "warm storage mode", or there are fruits and vegetables in all three storage modes, the storage area temperature is adjusted to the third level, the storage temperature is adjusted to 15-12℃, and the humidity is adjusted to 90-95%.

[0089] In some embodiments of the present application, a control screen 11 is provided on the box body 10 for displaying and selecting multiple temperature control intervals of the storage area, which can also be called multiple storage modes, for easy use and operation.

[0090] [drawer]

[0091] In some embodiments of this application, refer to Figure 4 The drawer 10 includes a drawer body 110 and a top cover 120. The top cover 120 is provided at the top opening of the drawer body 110 and is used to close and open the opening. When the top cover 120 is closed, the drawer body 110 and the top cover 120 form a closed storage area 130 for storing fruits and vegetables.

[0092] A pull-out structure such as a slide can be provided between the drawer body 110 and the refrigerator liner 20, and between the drawer body 110 and the top cover 120 to facilitate the pull-out action.

[0093] [Temperature control structure - heating part]

[0094] In some embodiments of the present application, the temperature in the drawer storage area is adjusted by the heating unit 200. It is understood that a temperature sensor 700 for collecting temperature data is provided in the storage area.

[0095] The heating part 200 may be an electric heating structure, such as a heating wire, and temperature adjustment is achieved by turning the heating wire on and off.

[0096] Since different types of tropical fruits and vegetables have different optimal storage temperature environments, multiple temperature control intervals are set in the storage area of ​​drawer 100, such as a warm storage mode corresponding to 15-12°C, a warm storage mode corresponding to 12-9°C, and a cold storage mode corresponding to 9-6°C.

[0097] The heating unit 200 stops operating when the temperature in the storage area 130 reaches or exceeds the upper temperature limit of the temperature control zone, and starts operating when the temperature in the storage area 130 reaches or falls below the lower temperature limit of the temperature control zone.

[0098] For example, taking bananas as an example, if the temperature in the storage area of ​​drawer 100 is higher than 15°C, the heating unit is turned off and the storage area does not need to be heated; if the temperature in the storage area is lower than 12°C, the heating unit is turned on to heat the storage area and increase the temperature of the storage area.

[0099] Regarding the specific setting structure of the heating unit 200, this application provides two implementation methods. One is to set the heating unit 200 on the side wall of the drawer 100, and the other is to set the heating unit 200 on the side wall of the inner tank 20 of the storage space 23 where the drawer 100 is located.

[0100] In some embodiments of the present application, the first configuration of the heating unit 200 is as follows: Figure 5 A heating portion 200 is provided on at least one side wall of the drawer body 110, which is referred to as a built-in heating portion. The heating portion 200 is a heating wire. When the heating wire is turned on, the storage area 130 is directly heated.

[0101] The heating wire is laid on the side wall of the drawer body 110 in a serpentine or spiral shape to increase the heating area and improve the heating efficiency.

[0102] In some embodiments of the present application, in order to improve the temperature uniformity in the storage area of ​​the drawer 100, heating wires are provided on multiple side walls of the drawer body 110. Figure 13 As shown, heating wires are provided on the front wall, the rear wall, and the left wall of the drawer 100 .

[0103] In some embodiments of the present application, the second configuration of the heating unit 200 is as follows: Figure 7 and Figure 8 The heating unit 200 is arranged on the inner wall of the storage space 23 where the drawer 100 is located, and is recorded as an external heating unit. The heating unit 200 does not directly heat the storage area of ​​the drawer 100, but heats the storage space 23 where the drawer 100 is located. After the air outside the drawer 100 is heated, the heat conduction effect of the drawer wall is used to make the storage area of ​​the drawer 100 slowly and steadily reach the optimal storage temperature required for fruits and vegetables over a longer period of time.

[0104] The reason for this setting is that, on the one hand, fruits and vegetables have temperature adaptability. If the storage environment temperature is rapidly increased at a faster heating rate, there will be a temperature difference between the surface and the center of the fruit and vegetable tissue. Due to thermal expansion and contraction, internal stress may be generated in tropical fruits and vegetables, which may cause the skin of tropical fruits and vegetables to rupture, and the respiration intensity to suddenly increase, resulting in a large amount of nutrient consumption, greatly reducing the quality of tropical fruits; on the other hand, rapid temperature changes in the storage environment may lead to uneven temperature, which is easy to cause condensation on the surface of tropical fruits and vegetables, causing maceration, accelerating the growth and reproduction of microorganisms and the corruption of tropical fruits and vegetables.

[0105] Through the external heating unit 200, the natural convection circulation of the air outside the drawer 100 during the heating process is utilized to uniformly increase the temperature of the air outside the drawer 100, and the heat transfer between the external air and the drawer storage area is achieved through heat conduction of the drawer outer wall, thereby improving the temperature uniformity in the storage area 130.

[0106] In some embodiments of this application, refer to Figure 8 The heating part 200 includes a heating wire 210, a heat reflecting layer 220, and a heat insulating layer 230. The heat insulating layer 230 is arranged on the inner wall of the container, the heat reflecting layer 220 is arranged on the heat insulating layer 230, and the heating wire 210 is arranged on the heat reflecting layer 220.

[0107] Heat-reflecting layer 220, which can be a layer of tin foil, reflects heat generated by heating wire 210 toward the rear into the interior of the box, specifically the space between inner container 20 and drawer 100. This increases the air temperature within this space and reduces the amount of heat transferred to inner container 20. A heat-insulating layer 230 is provided behind heat-reflecting layer 220 to further prevent heat transfer to inner container 20 and prevent burns.

[0108] At the same time, the heat reflecting layer 220 and the heat insulating layer 230 reduce the amount of heat transferred to the outside of the refrigerator, thereby reducing heat loss during the heating process and lowering the heating energy consumption of the heating unit.

[0109] The heating wire 210 is laid on the heat reflecting layer 220 in a coiled or spiral shape to increase the heating area and improve the heating efficiency.

[0110] In some embodiments of the present application, there are two external heating parts 200, one of which is located on the left side of the drawer 100, and the other external heating part 200 is located on the right side of the drawer 100, so that the space between the drawer 100 and the inner tank 20 is heated evenly, thereby improving the temperature uniformity in the storage area of ​​the drawer 100.

[0111] In some embodiments of the present application, a fan (ie, an internal dehumidification fan described below) 510 is provided in the storage area 130. Figure 6 The fan is used to accelerate the air flow in the storage area 130 and improve the temperature uniformity in the storage area 130.

[0112] The heating section 200 adopts a staged control mode. The heating section 200 cooperates with the fan to achieve slow temperature increase in the storage area while ensuring temperature uniformity, thereby reducing the risk of deterioration of tropical fruits and vegetables caused by excessive temperature increase and reducing module energy consumption.

[0113] Specifically, refer to Figure 8 When the temperature difference between the storage area of ​​the drawer 100 and the start-up point of the heating unit 200 is large, the heating unit 200 uses a higher start-up frequency, and the fan in the storage area adopts a low-speed, long-term operation scheme;

[0114] When the difference between the temperature in the storage area of ​​the drawer 100 and the start-up point of the heating unit 200 is small, the heating unit 200 uses a lower start-up frequency, and the fan in the storage area adopts a high-speed, short-time operation scheme.

[0115] In some embodiments of the present application, when fruits and vegetables are immature and need to be stored in a ripening mode, the heating unit 200 is turned on to increase the temperature, which helps to improve the respiration of the fruits and vegetables and accelerate ripening.

[0116] When the fruits and vegetables are ripe and need to be stored in a fresh-keeping mode, the heating unit 200 is turned off to keep the temperature in the storage area within the temperature range where the fruits and vegetables are at risk of being damaged. This helps to inhibit the respiration of the fruits and vegetables and extend the fresh-keeping storage time of the fruits and vegetables.

[0117] [Temperature control structure-cooling fan]

[0118] When the temperature in the storage area of ​​the drawer 100 is higher than the suitable storage temperature required for fruits and vegetables, the storage area needs to be cooled.

[0119] Taking banana storage as an example, if the temperature in the storage area of ​​the drawer 100 is higher than 15° C., the heating unit 200 is turned off and the storage area 130 needs to be cooled so that the storage area 130 reaches the target storage temperature range more quickly.

[0120] In some embodiments of this application, refer to Figure 10 The drawer 100 is cooled by a rear refrigeration fan (not shown). Specifically, an air cavity connected to the refrigeration air duct of the refrigerator is provided on the rear wall of the inner tank of the storage space 23 where the drawer 100 is located. The air cavity is provided with a refrigeration fan, and the air cavity is provided with an air outlet 21 and an air return port 22 on the side facing the storage space 23.

[0121] The cooling fan is turned on when the temperature in the storage area reaches above the set temperature upper limit. The cooling fan rotates and blows the cold air in the cooling duct through the air outlet 21 to the space area between the drawer 100 and the inner tank 20, cooling this area and thereby cooling the drawer 100.

[0122] The cold energy between the drawer 100 and the inner tank 20 can be directly transferred to the storage area through the cold energy conduction of the drawer wall; or a vent (not shown) can be opened on the side wall of the drawer 100 to directly introduce the cold energy into the storage area. A damper can be set at the vent and closed when cooling is not required.

[0123] During the cooling process, when the storage temperature of tropical fruits and vegetables drops sharply, chilling damage is likely to occur, which will reduce the sensory quality of fruits and vegetables. Therefore, the storage area needs to reduce the cooling rate while reaching the target storage temperature range as quickly as possible.

[0124] Therefore, in some embodiments of the present application, the operating power of the refrigeration fan is designed to decrease as the temperature in the storage area decreases.

[0125] As the temperature of the storage area of ​​the drawer 100 decreases, the speed of the cooling fan continues to decrease to slow down the cooling rate. When the temperature in the storage area is within the suitable storage temperature range, the temperature in the storage area is maintained by the start and stop time of the heating unit 200.

[0126] Figure 11 The figure shows a temperature control flow chart of the combination of the cooling fan and the heating unit 200.

[0127] [Humidity Control Structure - Humidification Unit]

[0128] In some embodiments of this application, refer to Figure 4 A humidifying unit 300 is provided in the storage area 130 , and water vapor is provided into the storage area 130 through the humidifying unit 300 to increase the humidity in the storage area 130 .

[0129] The humidifying unit 300 adopts a humidifying water box, which is a common humidifying module in the prior art, and the specific structure is not described in detail in this embodiment.

[0130] The humidifying water box is arranged on the side wall of the drawer body 110 to reduce the space occupied in the storage area.

[0131] When the humidity in the storage area of ​​drawer 100 falls below the required humidity for storing fruits and vegetables, humidifier 300 is activated. For example, if the humidity in storage area 130 falls below 90% when storing bananas, humidifier 300 is activated to raise the humidity in the storage area to the required range of 90-95%.

[0132] When fruits and vegetables are just put into the drawer 100, the humidity in the drawer 100 is low, which will cause the fruits and vegetables to evaporate a large amount of water, which is not conducive to the preservation and storage of fruits and vegetables. Therefore, the humidifying unit 300 is turned on at this time to increase the humidity in the drawer when the fruits and vegetables are just put in, thereby reducing the transpiration of fruits and vegetables.

[0133] However, since the external temperature of drawer 100 is relatively low, the large temperature difference between the inside and outside of drawer 100 will cause temperature fluctuations in the drawer. Moreover, since the humidity in drawer 00 is relatively high, temperature fluctuations can easily cause condensation, which is not conducive to the storage of fruits and vegetables.

[0134] Therefore, in some embodiments of the present application, a cooling part is designed to cool the water in the humidification water box. The cooling part is turned on when the temperature of the water in the humidification water box reaches above the measured temperature value in the storage area 130. The humidification water box is turned on when the temperature of the water in the humidification water box reaches below the measured temperature value in the storage area 130 and the humidity in the storage area reaches below the set humidity lower limit value.

[0135] Through the above design, the water temperature in the humidification water box is always lower than the temperature in the storage area 130. When humidification is performed, the temperature of the blown air can be lower than the temperature in the storage area 130. In this way, condensation caused by high humidity in the storage area 130 can be reduced during humidification.

[0136] In some embodiments of the present application, a heating unit 200 is provided on at least one circumferential side wall of the drawer 100. A temperature sensor 700 is provided on the circumferential side wall where the heating unit 200 is provided. The measurement value of the temperature sensor 700 serves as reference temperature data for comparison when starting and stopping the cooling unit. In other words, the measurement data of the temperature sensor 700 serves as the temperature data in the storage area 130. The cooling unit determines whether to start or stop based on a comparison between this temperature data and the water temperature data in the water box.

[0137] In some embodiments of the present application, a plurality of the circumferential side walls of the drawer 100 are provided with a heating unit 200, and each heating unit 200 is started and stopped according to the temperature data detected by the corresponding temperature sensor 700, so that the temperature of each circumferential side wall is equal, so that the temperature on each circumferential side wall of the drawer 100 is the same, ensuring the temperature uniformity in the storage area 130.

[0138] This case provides a specific embodiment, referring to Figure 13 and Figure 14 The front, rear, and left sides of the drawer body 110 are each equipped with a heating unit 200 and a temperature sensor 700. A temperature sensor (not shown) is located within the humidifying water box to monitor the water temperature. When a user places tropical fruits and vegetables that need to be kept fresh, the freshness mode is activated. The temperature sensors 700 on the inner walls of the drawer 100 sense the temperature of each wall and record the highest (Tmax) and lowest (Tmin) values ​​detected by the three temperature sensors on the drawer side walls, as well as the water temperature Tw.

[0139] When Tw>Tmax, the three heating units 200 start working. When the temperatures of the three temperature sensors inside the drawer 100 are consistent and equal to Tw, the heating units 200 stop working. At this time, the cooling unit starts to cool the water in the humidification water box.

[0140] When Tmin≤Tw≤Tmax, the heating part 200 on the inner wall corresponding to the temperature lower than Tmax will work. When the temperature is equal to Tmax, the heating part 200 will stop working. At this time, the cooling part will be turned on to cool the water in the humidification water box.

[0141] When Tw<Tmin, the heating unit 200 operates until the temperature is equal to Tmax.

[0142] Regarding the structural design of the cooling part, this application provides two wind types.

[0143] In the first mode of the cooling part, in some embodiments of the present application, the cooling part 100 is a cooling fan (not shown) provided in the humidification water box. When the cooling fan is turned on, the water in the water box can be cooled.

[0144] The second method of cooling part, in some embodiments of this application, refer to Figure 13 The cooling part is a vent provided on the drawer 100 and connected to the humidification water box. The vent is connected to the refrigeration air duct of the refrigerator. The vent is used to transport cold air into the humidification water box to cool the water in the humidification water box. A damper 310 is provided at the vent for closing and opening the vent.

[0145] When the humidification water box needs to be cooled, the damper 310 is opened; when the humidification water box does not need to be cooled, the damper 310 is closed.

[0146] [Humidity control structure - moisture-permeable membrane, dehumidification fan]

[0147] Since the drawer 100 forms a closed storage area 130, tropical fruits and vegetables are stored at a high temperature, and their respiration is inevitable. Even low-intensity respiration will produce moisture, which is stored in the storage area 130. When the humidity in the storage area 130 is higher than 95%, the tropical fruits and vegetables are prone to spoilage, so the excess moisture needs to be discharged.

[0148] In some embodiments of the present application, a moisture permeable film 400 is provided on the drawer 100, specifically, a moisture permeable film 400 is provided on the top cover 120, referring to Figure 6 The moisture-permeable membrane 400 is used to allow the moisture in the storage area 130 to flow out to the outside in one direction when the humidity in the storage area 130 reaches a set humidity upper limit, so as to reduce the humidity in the storage area 130.

[0149] The moisture permeable membrane 400 is a highly moisturizing humidity regulating membrane that only allows water to flow out in one direction. When the relative humidity inside the membrane is low, the moisture permeability is low to prevent water loss; when the relative humidity is high, the moisture permeability is high to discharge excess water.

[0150] In some embodiments of this application, continue to refer to Figure 6 An internal dehumidification fan 510 is provided on the inner side of the top cover 120 . The internal dehumidification fan 510 is provided close to the moisture permeable membrane 400 . The internal dehumidification fan 510 is used to discharge the air in the storage area 130 outward through the moisture permeable membrane 400 .

[0151] When the humidity in the storage area 130 needs to be reduced, the internal dehumidification fan 510 is turned on to accelerate the air flow in the storage area 130, accelerate the air discharge rate through the moisture permeable membrane 400, and speed up the dehumidification speed.

[0152] In some embodiments of this application, refer to Figure 10 An external dehumidification fan 520 is also provided on the outside of the top cover 120, and the external dehumidification fan 520 is also arranged close to the moisture permeable membrane 400. The internal dehumidification fan 510 and the external dehumidification fan 520 are used to operate at different speeds to adjust the water vapor pressure difference between the inner and outer sides of the moisture permeable membrane 400, and adjust the rate at which moisture in the storage area 130 flows out through the moisture permeable membrane 400.

[0153] The internal dehumidification fan 510 and the external dehumidification fan 520 run at different speeds, so that the wind speeds on both sides of the moisture permeable membrane 400 are different. According to the Bernoulli effect, the greater the flow rate of the fluid, the smaller the pressure, which reduces the water pressure outside the membrane and accelerates the water outflow.

[0154] An internal humidity sensor is installed within storage area 130 to monitor humidity within the storage area. An external humidity sensor is installed within storage space 23 (i.e., outside drawer 100) to monitor humidity within storage space 23. Internal and external dehumidification fans 510 and 520 operate at different speeds based on the data detected by the internal and external humidity sensors.

[0155] Specifically, refer to Figure 12 When the difference between the actual humidity in the storage area 130 and the preset humidity is large, the speed difference between the external dehumidification fan 520 and the internal dehumidification fan 510 is increased, thereby increasing the water vapor pressure difference between the inside and outside of the moisture permeable membrane 400, accelerating the water inside the storage area 130 to pass through the moisture permeable membrane, thereby achieving the purpose of rapid dehumidification.

[0156] When the difference between the actual humidity in the storage area and the preset humidity is small, the speed difference between the external dehumidification fan 520 and the internal dehumidification fan 510 is reduced, thereby reducing the gas pressure difference between the inside and outside of the moisture permeable membrane 400, and reducing the rate at which moisture inside the storage area 130 passes through the moisture permeable membrane, thereby stabilizing the humidity in the storage area 130 to reach the target humidity.

[0157] In some embodiments of the present application, in order to better control the humidity, refer to Figures 15 to 18 A magnetic sensitive portion 810 is provided on the inner side of the internal dehumidification fan 510. The magnetic sensitive portion 810 is made of a magnetic sensitive material. The magnetic sensitive portion 810 has an extension portion 811 extending outward from the internal dehumidification fan 510. The extension portion 811 extends toward the moisture permeable membrane 400. An electromagnetic coil 820 is provided above the extension portion 811.

[0158] When the electromagnetic coil 820 is energized, magnetism is generated, and the extension portion 811 is displaced toward the electromagnetic coil 820 under the magnetic effect generated by the electromagnetic coil 820, that is, the extension portion 811 is offset upward by a certain angle, so that the air flowing out of the storage area 130 is deflected toward the moisture permeable membrane 400, so that the moisture in the storage area 130 passes through the moisture permeable membrane 400 faster, thereby increasing the dehumidification speed.

[0159] In some embodiments of the present application, the electromagnetic coil 820 has multiple levels of working power, and the working power of the electromagnetic coil 820 increases as the humidity in the storage area 130 increases, so as to increase the dehumidification rate.

[0160] Specifically, when the humidity in the storage area 130 is less than 85%, the electromagnetic coil 820 does not work. When the humidity is greater than 85%, the electromagnetic coil 820 starts to work at gear 1 (lower power). At this time, the electromagnetic coil 820 has a certain magnetism, which attracts the extension 811 to deflect upward by a small angle, so that the wind blown out from the storage area 130 is slightly deflected toward the moisture-permeable membrane 400. When the humidity is greater than 90%, the electromagnetic coil 820 starts to work at gear 2 (higher power), with stronger magnetism. At this time, the extension 811 deflects upward by a larger angle, so that the wind blown out from the storage area 130 is deflected toward the moisture-permeable membrane 400, thereby allowing excess moisture to pass through the moisture-permeable membrane 400 faster, so that the humidity in the storage area 130 is controlled to be constant at around 90%.

[0161] [Remove Ethylene]

[0162] When the temperature and humidity in storage area 130 are within the optimal storage range for tropical fruits and vegetables, the storage environment is at a high temperature and high humidity (14°C, 90% RH) compared to the 4°C and 50% humidity of a conventional refrigerator. This storage environment presents two problems: First, due to the high sugar content of tropical fruits and vegetables, the high temperature and high humidity accelerate the growth of microorganisms, making them more susceptible to spoilage; second, the high temperature and high humidity increase the release of ethylene from tropical fruits and vegetables, which promotes respiratory transitions in tropical fruits and vegetables, enhancing respiration and accelerating the consumption of nutrients, making storage unfavorable.

[0163] In order to address the problem of easier breeding of microorganisms, it is necessary to use more powerful sterilization technology than that under 4°C refrigeration conditions, such as ion sterilization technology, which can produce active ingredients such as negative ions, oxygen free radicals, and hydroxyl free radicals. The sterilization module needs to run for a longer time and be combined with air circulation to achieve better sterilization effects.

[0164] Ethylene has a dual effect on tropical fruits and vegetables. When they are still young, ethylene can promote their ripening and enhance their taste. However, once they are ripe, ethylene accelerates their spoilage. Because the storage area within the drawer is sealed and ethylene cannot pass through the moisture-permeable membrane, this area can accumulate ethylene, accelerating the ripening of tropical fruits and vegetables. However, once tropical fruits and vegetables are ripe, the ethylene present at this time is detrimental to their storage. At this time, the ion sterilization device can oxidize and remove the ethylene through oxygen free radicals, thereby extending the shelf life of tropical fruits and vegetables.

[0165] In summary, in some embodiments of the present application, an ethylene removal unit 600 is provided in the storage area 130, which is specifically an ion sterilization device. On the one hand, the negative ions, oxygen free radicals, hydroxyl free radicals and other active ingredients generated by it have a strong bactericidal effect, thereby preventing the growth of microorganisms in the storage area. On the other hand, the oxygen free radicals generated by it can oxidize and remove ethylene, thereby achieving the effect of extending the shelf life of tropical fruits and vegetables.

[0166] That is, the ion sterilization device is turned on at two time points. One is when the tropical fruits and vegetables are just placed in the drawer, and the storage area 130 is sterilized first to prevent the growth of microorganisms; the other is when the tropical fruits and vegetables in the storage area 130 are ripe, the ion sterilization device is turned on, and while achieving the sterilization effect, it removes ethylene to extend the storage and freshness period of the fruits and vegetables.

[0167] [Fruit and vegetable maturity detection and control]

[0168] It's difficult for consumers to control the maturity of tropical fruits and vegetables at home. They overripen quickly when stored at room temperature, and the low temperatures of refrigerators can cause chilling damage. Even if consumers keep tropical fruits and vegetables at the ideal storage temperature of 10-15°C, it's difficult to achieve optimal maturity and maximize the time they remain at optimal maturity simply by temperature alone.

[0169] Fruits and vegetables at different states of maturity require different storage environments. For example, if the fruits and vegetables are not yet mature, they need to be ripened. At this time, the temperature, humidity, and ethylene content in the storage area need to be increased accordingly to make the fruits and vegetables reach a maturity suitable for consumption as soon as possible; if the fruits and vegetables are already mature, they need to be preserved. At this time, the temperature, humidity, and ethylene content in the storage area need to be lowered accordingly to inhibit the respiration of the fruits and vegetables and extend the storage time of the fruits and vegetables; if the fruits and vegetables are not yet mature, but consumers want the fruits and vegetables to mature slowly, then the temperature, humidity, and ethylene content in the storage area can also be lowered to inhibit the respiration of the fruits and vegetables and extend the storage time of the fruits and vegetables.

[0170] Therefore, another important invention of the present application is to obtain the maturity of tropical fruits and vegetables through detection and analysis, and to control the operation of components such as the heating section 200, the humidification section 300, and the ethylene removal section 600 according to the maturity and the user's storage requirements, so as to provide a most suitable storage environment for the fruits and vegetables.

[0171] Fruits and vegetables have suitable storage temperature ranges and critical temperature ranges for chilling damage, such as Figure 1 and Figure 2 The refrigerator in this application stores fruits and vegetables in the following manner:

[0172] When the system identifies and analyzes that the fruits and vegetables have not reached the optimal maturity, the refrigerator enters the ripening mode, that is, the fruits and vegetables are ripened. The heating unit 200 is turned on or off according to the temperature in the storage area 130 to ensure that the temperature in the storage area 130 is within the storage temperature range suitable for fruits and vegetables. At the same time, the ethylene removal unit 600 is turned off to increase the ethylene content, improve the respiration of fruits and vegetables, and accelerate ripening.

[0173] When the system determines based on analysis that the fruits and vegetables have reached optimal maturity, the refrigerator enters the fresh-keeping mode, that is, the fruits and vegetables are stored for fresh-keeping. The heating unit 200 is turned on or off according to the temperature in the storage area to ensure that the temperature in the storage area 130 is within the critical temperature range for chilling damage to fruits and vegetables. At the same time, the ethylene removal unit 600 is turned on to lower the temperature and ethylene content, thereby inhibiting the respiration of fruits and vegetables and maximizing the time that fruits and vegetables remain at optimal maturity.

[0174] For the detection of fruit and vegetable maturity, this application uses the respiratory intensity method. Specifically, a weight sensor is provided at the bottom of the drawer 100 to obtain the weight of the fruits and vegetables in the storage area. An O2 or CO2 concentration sensor is provided in the storage area 130 to obtain the O2 or CO2 concentration in the storage area.

[0175] The system analyzes and calculates the respiration intensity of the fruits and vegetables based on the weight of the fruits and vegetables and the O2 or CO2 concentration in the storage area 130. The system determines the maturity of the fruits and vegetables based on the respiration intensity and controls the operation of the heating part 200, the humidifying part 300, and the ethylene removal part 600.

[0176] Reference Figure 19 When fruits and vegetables are placed in the compartment, the weight sensor detects the weight m, and the O2 or CO2 concentration sensor detects the initial concentration S0. The time T is calculated from the time the weight sensor detects the weight, and the O2 or CO2 concentration S can be detected in real time. The respiration intensity of fruits and vegetables in the compartment can be calculated according to the formula.

[0177] Calculated using CO2 concentration:

[0178]

[0179] Where, S is the real-time CO2 concentration in the storage area (%);

[0180] S0—the initial CO2 concentration in the storage area when no fruits or vegetables are placed (%);

[0181] V—spatial volume of storage area (L);

[0182] d—density of CO2 (g / L);

[0183] m—weight of fruits and vegetables (kg);

[0184] T—measurement time (h).

[0185] Calculated using O2 concentration:

[0186]

[0187] Where, S is the real-time O2 concentration in the storage area (%);

[0188] S0—the initial O2 concentration in the storage area when no fruits or vegetables are placed (%);

[0189] V—spatial volume of storage area (L);

[0190] d—density of O2 (g / L);

[0191] m—weight of fruits and vegetables (kg);

[0192] T—measurement time (h).

[0193] The fruit and vegetable storage control process based on the respiratory intensity detection method of O2 or CO2 concentration is as follows: Figure 19 and Figure 20 shown.

[0194] If it is detected that the respiration intensity of fruits and vegetables suddenly increases and the rate of change is large, it means that the fruits and vegetables have entered the maturity period, and the ripening mode is activated.

[0195] If the respiration intensity of fruits and vegetables is detected to be stable, it means that the fruits and vegetables are ripe and the preservation mode is activated.

[0196] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0197] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A refrigerator, comprising: Box; An inner liner is disposed in the box body, and the inner liner encloses a plurality of storage spaces for storing items; Characterized in that the refrigerator further comprises: a drawer, comprising at least one drawer, the drawer being arranged in the storage space, and forming a closed storage area for storing fruits and vegetables; a heating unit, configured to adjust the temperature in the storage area; a moisture-permeable film provided on the drawer, the moisture-permeable film being used to allow moisture in the storage area to flow outward in one direction when the humidity in the storage area is greater than the external humidity, so as to adjust the humidity in the storage area; an ethylene removal unit, disposed in the storage area and configured to remove ethylene in the storage area; a weight sensor, disposed at the bottom of the drawer, for obtaining the weight of fruits and vegetables in the storage area; An O2 or CO2 concentration sensor is provided in the storage area and is used to obtain the O2 or CO2 concentration in the storage area; The system analyzes and calculates the respiration intensity of the fruits and vegetables based on the weight of the fruits and vegetables and the O2 or CO2 concentration in the storage area, and determines the maturity of the fruits and vegetables based on the respiration intensity, thereby controlling the operation of the heating unit and the ethylene removal unit; The moisture permeable membrane and an internal dehumidification fan are provided on the top wall of the drawer, the internal dehumidification fan is arranged close to the moisture permeable membrane, the internal dehumidification fan is arranged on the inner side of the top wall of the drawer, and the internal dehumidification fan is used to discharge the air in the storage area to the outside; A magnetic sensitive portion is provided on the inner side of the internal dehumidification fan, and the magnetic sensitive portion has an extension portion extending outward from the internal dehumidification fan, the extension portion extends toward the moisture permeable membrane, and an electromagnetic coil is provided above the extension portion. The extension portion is displaced toward the direction close to the electromagnetic coil under the magnetic effect generated by the electromagnetic coil.

2. The refrigerator according to claim 1, wherein: Fruits and vegetables have suitable storage temperature ranges and critical temperature ranges for chilling damage; When the system analysis shows that the fruits and vegetables have not reached the optimal maturity, the refrigerator enters the ripening mode, the heating unit is turned on or off according to the temperature in the storage area to keep the temperature in the storage area within the suitable storage temperature range, and the ethylene removal unit is turned off; When the system analysis shows that the fruits and vegetables have reached the optimal maturity, the refrigerator enters the fresh-keeping mode, the heating unit is turned on or off according to the temperature in the storage area so that the temperature in the storage area is within the critical temperature range of chilling damage, and the ethylene removal unit is turned on.

3. The refrigerator according to claim 1, wherein: The heating part is arranged on the inner wall of the storage space where the drawer is located, and is used to adjust the temperature of the storage space where the drawer is located. The heating part includes a heating wire, a heat reflecting layer, and a heat insulating layer. The heat insulating layer is arranged on the inner wall, the heat reflecting layer is arranged on the heat insulating layer, and the heating wire is arranged on the heat reflecting layer.

4. The refrigerator according to claim 1, wherein An air cavity connected to the refrigeration air duct of the refrigerator is provided on the rear wall of the inner container of the storage space where the drawer is located. A refrigeration fan is provided in the air cavity. An air outlet and an air return port are provided on the side of the air cavity facing the storage space. The cooling fan is turned on when the temperature in the storage area reaches a set temperature upper limit value or above.

5. The refrigerator according to claim 1, wherein The electromagnetic coil has multiple levels of working power, and the working power of the electromagnetic coil increases as the humidity in the storage area increases.

6. The refrigerator according to claim 1, wherein: An external dehumidification fan is provided on the outer side of the top wall of the drawer, and the external dehumidification fan is arranged close to the moisture permeable membrane. The internal dehumidification fan and the external dehumidification fan are used to operate at different speeds to adjust the water vapor pressure difference between the inner and outer sides of the moisture permeable membrane, and adjust the rate at which moisture in the storage area flows out through the moisture permeable membrane.

7. The refrigerator according to any one of claims 1 to 6, characterized in that A humidifying water box is provided in the storage area for adjusting the humidity in the storage area; The humidifying water box has a cooling unit for cooling the water in the humidifying water box, and the cooling unit is turned on when the temperature of the water in the humidifying water box reaches or exceeds the measured temperature value in the storage area.

8. The refrigerator according to claim 7, characterized in that The cooling unit is a cooling fan provided in the humidifying water box; or, The vent is provided on the drawer and connected to the humidifying water box. The vent is connected to the refrigeration air duct of the refrigerator. The vent is used to transport cold air into the humidifying water box to cool the water in the humidifying water box. The vent is provided with a damper for closing and opening the vent.

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