Refrigerator

Abstract

The invention discloses a refrigerator. A storage space is formed in a refrigerator body; the door body is configured to close or open the storage space; the vacuum drawer is arranged in the storage space, and a storage cavity is formed in the vacuum drawer; the electromagnetic part is arranged on the vacuum drawer, and the electromagnetic part is configured to enable the storage cavity to have a magnetic field; the vacuum pump is configured to vacuumize the vacuum drawer; the controller is configured to control the electromagnetic part to operate at first operation power W1 when the vacuum pump operates, so that the magnetic induction intensity in the storage cavity is B1; the controller is further configured to control the electromagnetic part to operate at second operation power W2 when the vacuum pump stops, so that the magnetic induction intensity in the storage cavity is B2; wherein W1 is greater than W2, and B1 is greater than B2. According to the refrigerator, the food fresh-keeping effect can be improved through associated control of the electromagnetic part and the vacuum pump.

Description

Technical Field

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

[0002] A vacuum drawer is provided in a refrigerator in the related art. A vacuum pump is used to evacuate the vacuum drawer to remove oxygen in the vacuum drawer, thereby improving the freshness preservation effect of food materials. Along with the evacuation process, the pressure in the vacuum drawer decreases, which will cause the water in the food materials to volatilize. Especially during the evacuation process, the continuously changing pressure value in the vacuum drawer causes the surface tension of the cell membrane of the food materials to change continuously, accelerating the cell movement and the molecular movement inside the cells, thus being ineffective in preserving the freshness of the food materials.

[0003] The above information disclosed in this background art is only used to increase the understanding of the background art of the present application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0004] Aiming at the problems pointed out in the background art, the present invention provides a refrigerator that can improve the freshness preservation effect of food materials.

[0005] To achieve the above invention purpose, the present invention is implemented by adopting the following technical solutions: In some embodiments of the present application, a refrigerator is provided. A storage space is formed inside the box body; a door body is configured to close or open the storage space; a vacuum drawer is arranged in the storage space, and a storage cavity is formed inside the vacuum drawer; an electromagnetic part is arranged on the vacuum drawer, and the electromagnetic part is configured to make there be a magnetic field in the storage cavity; a vacuum pump is configured to evacuate the vacuum drawer; a controller is configured to control the electromagnetic part to operate at a first operating power W1 when the vacuum pump is running, so that the magnetic induction intensity in the storage cavity is B1; the controller is further configured to control the electromagnetic part to operate at a second operating power W2 when the vacuum pump stops, so that the magnetic induction intensity in the storage cavity is B2; wherein, W1 > W2, B1 > B2.

[0006] The above technical solution has the following advantages or beneficial effects: After the vacuum drawer is switched from the open state to the closed state, the vacuum pump is turned on to evacuate the vacuum drawer. At this time, the temperature and pressure in the vacuum drawer are not very low yet. In order to improve the freshness preservation effect of food materials in the initial stage of evacuation, the electromagnetic part operates at a high-power first operating power W1, so that the magnetic induction intensity at the central position of the storage cavity is B1, and the magnetic induction intensity in the vacuum drawer increases, improving the freshness preservation effect of food materials.

[0007] As the vacuum pumping progresses, both the pressure and temperature inside the vacuum drawer continuously decrease. After the pressure inside the vacuum drawer drops to the system-set value, the vacuum pump stops. At this time, both the pressure and temperature inside the vacuum drawer have decreased to a certain value. The low pressure and low temperature have a certain enhancing effect on the food preservation effect. Then, the electromagnetic part operates at a second operating power W2 with low power, so that the magnetic induction intensity at the central position of the storage cavity is B2, and the magnetic induction intensity inside the vacuum drawer decreases. While ensuring the food preservation effect, it can also avoid cost increase.

[0008] In some embodiments of the present application, the vacuum pumping process of the vacuum pump for the vacuum drawer includes a vacuum pumping stage and a pressure holding stage; During the vacuum pumping stage, the vacuum pump is turned on, and the pressure inside the vacuum drawer drops to a second preset pressure threshold b, and the electromagnetic part operates at the first operating power W1; During the pressure holding stage, when the pressure inside the vacuum drawer rises to a first preset pressure threshold a, the vacuum pump is turned on so that the pressure inside the vacuum drawer drops to the second preset pressure threshold b, and the electromagnetic part operates at the second operating power W2.

[0009] The above technical solution has the following advantages or beneficial effects: During the vacuum pumping stage, after the vacuum drawer is switched from the open state to the closed state, the vacuum pump is turned on. At this time, the temperature and pressure inside the vacuum drawer are not very low yet. To improve the food preservation effect in the initial stage of vacuum pumping, the electromagnetic part operates at the first operating power W1 with high power, so that the magnetic induction intensity at the central position of the storage cavity is B1, and the magnetic induction intensity inside the vacuum drawer increases, enhancing the food preservation effect.

[0010] During the pressure holding stage, both the pressure and temperature inside the vacuum drawer have decreased to a certain value. The low pressure and low temperature have a certain enhancing effect on the food preservation effect. Then, the electromagnetic part operates at the second operating power W2 with low power, so that the magnetic induction intensity at the central position of the storage cavity is B2, and the magnetic induction intensity inside the vacuum drawer decreases. While ensuring the food preservation effect, it can also avoid cost increase.

[0011] In some embodiments of the present application, during the pressure holding stage, after every set time T0, the electromagnetic part operates at the first operating power W1 for a time t0 and then stops.

[0012] The above technical solution has the following advantages or beneficial effects: Utilize the heat generated by the electromagnetic part to volatilize the condensation generated in the vacuum drawer.

[0013] In some embodiments of the present application, when the number of times the vacuum drawer is opened within a set time is greater than K, the running time of the electromagnetic part at the first running power W1 is extended.

[0014] The above technical solution has the following advantages or beneficial effects: If the number of times the vacuum drawer is opened within a set time is greater than K, the system considers that the vacuum drawer is frequently opened, and the condensation will be aggravated. Then, the running time of the electromagnetic part at a high power is extended to improve the volatilization effect of the condensation.

[0015] In some embodiments of the present application, during the vacuum pumping stage, the first running power W1 is 64 - 100% of the rated power of the electromagnetic part, and the magnetic induction intensity B1 at the center of the storage cavity satisfies B1 ≥ 4mT and B1 ≤ 5mT.

[0016] The above technical solution has the following advantages or beneficial effects: If B1 > 5mT, the magnetic induction intensity inside the vacuum drawer is strong, which increases the energy consumption cost and the heat generation amount, affecting the low-temperature environment of the vacuum drawer. If B1 < 4mT, the magnetic induction intensity inside the vacuum drawer is weak, which is not conducive to food preservation when the pressure and temperature inside the vacuum drawer do not reach the set values.

[0017] During the pressure holding stage, the second running power W2 is 4 - 16% of the rated power of the electromagnetic part, and the magnetic induction intensity B2 at the center of the storage cavity satisfies B2 ≥ 1mT and B2 ≤ 2mT.

[0018] The above technical solution has the following advantages or beneficial effects: If B2 > 2mT, the energy consumption cost will increase; if B2 < 1mT, the food preservation effect will be reduced.

[0019] In some embodiments of the present application, a first reinforcing rib group is provided on the top wall of the drawer frame body. The first reinforcing rib group includes a plurality of circumferential ribs and a plurality of radial ribs. The circumferential ribs extend annularly around the central position of the first reinforcing rib group, and the radial ribs extend radially along the circumferential ribs; The electromagnetic part is an electromagnetic coil, and the electromagnetic coil is disposed around between two adjacent circumferential ribs.

[0020] The above technical solution has the following advantages or beneficial effects: The installation of the electromagnetic coil makes full use of the space between two adjacent circumferential ribs, with a compact structure and convenient installation.

[0021] In some embodiments of the present application, the vacuum drawer further includes an air duct part, the air duct part is configured to convey cold air into the space where the drawer frame body is located, a air damper is provided on the air duct part, and the controller is further configured to control the opening or closing of the air damper according to the temperature inside the drawer cavity; After the vacuum pump evacuates the vacuum drawer to reduce the pressure in the storage cavity to the second preset pressure threshold b, the air door opens.

[0022] The above technical solution has the following advantages or beneficial effects: Use cold air to cool the electromagnetic coil, avoiding the heat generated by the electromagnetic coil from affecting the low-temperature environment of the vacuum drawer.

[0023] In some embodiments of the present application, a ventilation opening is provided at a position of the air duct portion facing the electromagnetic portion.

[0024] The above technical solution has the following advantages or beneficial effects: A ventilation opening is provided at a position of the air duct portion facing the electromagnetic portion. That is, a plurality of ventilation openings are provided on the side of the air duct portion facing the drawer housing, and the plurality of ventilation openings face the electromagnetic coil, and the cold air flowing out from the ventilation openings can directly blow the electromagnetic coil, improving the cooling effect on the electromagnetic coil.

[0025] In some embodiments of the present application, a refrigerator is provided. A storage space is formed inside the refrigerator body; a door body is configured to close or open the storage space; a vacuum drawer is provided in the storage space, and a storage cavity is formed inside the vacuum drawer; an electromagnetic portion is provided on the vacuum drawer, and the electromagnetic portion is configured to make a magnetic field exist in the storage cavity; a vacuum pump is configured to evacuate the vacuum drawer; a controller is configured to adjust the operating power of the electromagnetic portion according to the evacuation stage of the vacuum pump for the vacuum drawer, so that the magnetic induction intensity in the storage cavity changes.

[0026] The above technical solution has the following advantages or beneficial effects: The fresh-keeping effect of the food ingredients in the vacuum drawer is the result of the combined action of multiple factors such as pressure, temperature, and magnetic field. The evacuation process of the vacuum pump for the vacuum drawer includes an evacuation stage and a pressure-holding stage. After the drawer is switched from the open state to the closed state, the vacuum pump is turned on to evacuate the vacuum drawer. At this time, the temperature in the vacuum drawer is not very low, and the pressure in the vacuum drawer is not very low. In order to improve the fresh-keeping effect of the food ingredients during the evacuation stage, the operating power of the electromagnetic portion can be increased to increase the magnetic induction intensity in the vacuum drawer, and the high magnetic induction intensity is used to make up for the adverse effects of temperature and pressure on the fresh-keeping of the food ingredients during the evacuation stage, thereby improving the overall fresh-keeping effect of the food ingredients.

[0027] After the evacuation stage ends, the vacuum drawer enters the pressure-holding stage. At this time, the pressure and temperature in the vacuum drawer have both decreased to a certain value, and the low pressure and low temperature have a certain promoting effect on the fresh-keeping effect of the food ingredients. Then, the operating power of the electromagnetic portion can be appropriately reduced, while ensuring the fresh-keeping effect of the food ingredients, avoiding cost increase, and avoiding the working heat of the electromagnetic portion from affecting the temperature of the vacuum drawer.

[0028] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become clearer. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 A structural diagram of a refrigerator according to some embodiments; Figure 2 A structural diagram of a vacuum drawer according to some embodiments; Figure 3 Another structural diagram of a vacuum drawer according to some embodiments; Figure 4 Another structural diagram of a vacuum drawer according to some embodiments; Figure 5 Is Figure 4 An enlarged view of part A in; Figure 6 An exploded view of a vacuum drawer according to some embodiments; Figure 7 A structural diagram of a drawer housing according to some embodiments; Figure 8 A top view of a drawer housing according to some embodiments; Figure 9 One of the control principle flowcharts of a refrigerator according to some embodiments; Figure 10 Another control principle flowchart of a refrigerator according to some embodiments; Figure 11 The weight loss rate data of fruits and vegetables when there are different magnetic fields in a vacuum drawer according to some embodiments; Figure 12 The juice loss rate data of beef when there are different magnetic fields in a vacuum drawer according to some embodiments; Figure 13 The TVBN content data of beef when there are different magnetic fields in a vacuum drawer according to some embodiments; Figure 14 The juice loss rate data of salmon when there are different magnetic fields in a vacuum drawer according to some embodiments; Figure 15 The TVBN content data of salmon when there are different magnetic fields in a vacuum drawer according to some embodiments. Detailed implementation manners

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0032] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0033] The terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "plurality" is two or more.

[0034] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0036] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not 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 of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0037] In some embodiments of the present application, a refrigerator is provided. Referring to Figure 1 , the refrigerator includes a cabinet 110. A storage space 130 is formed inside the cabinet 110.

[0038] A plurality of partition parts are arranged inside the cabinet 110. The partition parts divide the storage space 130 into a plurality of storage compartments. The plurality of storage compartments are arranged vertically or horizontally. The storage space 130 serves as a freezer, a refrigerator compartment, a variable-temperature compartment, etc., to meet different storage needs such as freezing, refrigerating, and variable-temperature according to different types of food ingredients.

[0039] A liner 120 is arranged inside the cabinet 110, and the storage compartments are formed inside the liner 120. It can be understood that a plurality of liners 120 are arranged inside the cabinet 110, and one or more storage compartments can be formed inside each liner 120.

[0040] The refrigerator further includes a door body 140. The door body 140 is connected to the cabinet 110, and the door body 140 is configured to close or open the storage space 130. For example, the door body 140 is rotatably connected to the cabinet 110 through a hinge, and the door body 140 can rotate around the hinge axis to realize the opening and closing of the door body 140, thereby opening or closing the storage space 130.

[0041] A plurality of door bodies 140 are provided, and the plurality of door bodies 140 are arranged in one-to-one correspondence with the plurality of storage compartments.

[0042] The refrigerator further includes a refrigeration component. The refrigeration component is used to provide cold for the inside of the refrigerator to maintain a low-temperature environment in each storage compartment. The refrigeration component includes a compressor, a condenser, an evaporator, a throttling device, etc. The specific structure and connection relationship of the refrigeration component can refer to the refrigeration component in the related art and will not be elaborated here.

[0043] The refrigerator further includes a vacuum drawer 200. The vacuum drawer 200 is arranged in the storage space 130. For example, the vacuum drawer 200 is arranged in the storage compartment serving as the refrigerator compartment. Figure 2 FIG. is a structural diagram of the vacuum drawer 200, Figure 4A structural diagram of a vacuum drawer with the air duct part omitted. Figure 6 An exploded view of a vacuum drawer 200.

[0044] The vacuum drawer 200 includes a drawer frame 310. Figure 7 A structural diagram of the drawer frame 310. Figure 8 A top view of the drawer frame 310. A drawer cavity 311 with an open end 312 is formed inside the drawer frame 310. For example, the drawer frame 310 is of a rectangular structure. A drawer cavity 311 is formed inside the drawer frame 310, and the front end of the drawer frame 310 is open. The front open end 312 is communicated with the drawer cavity 311.

[0045] The vacuum drawer 200 further includes a drawer body 210. The drawer body 210 is configured to be slidably disposed in the drawer cavity 311 through the open end 312. When the drawer body 210 is put into the drawer cavity 311 through the open end 312 at the front end of the drawer frame 310, the drawer cavity 311 is closed. When the drawer body 210 is pulled out through the open end 312 at the front end of the drawer frame 310, the drawer cavity 311 is opened.

[0046] The drawer body 210 is of a rectangular box structure with an open top. A storage cavity 211 is formed inside the drawer body 210, and the storage cavity 211 is a cavity structure with an open top. Ingredients can be put into the storage cavity 211 through the open top of the storage cavity 211, or taken out of the storage cavity 211 through the open top of the storage cavity 211.

[0047] A drawer door 220 is provided at the front end of the drawer body 210. The drawer door 220 is used to push and pull the drawer body 210 so that the drawer body 210 can be slid in the drawer frame 310. When the drawer body 210 is completely pushed into the drawer frame 310, the drawer door 220 is in sealing contact with the circumferential edge of the front open end 312 of the drawer frame 310, thereby closing the drawer cavity 311.

[0048] The refrigerator further includes a pressure detection device (not shown), and the pressure detection device is configured to detect the pressure inside the vacuum drawer 200.

[0049] The refrigerator further includes a temperature sensor (not shown), and the temperature sensor is configured to detect the temperature inside the storage cavity of the vacuum drawer 200.

[0050] The refrigerator further includes a vacuum pump 400. The vacuum pump 400 is configured to evacuate the vacuum drawer 200. When the drawer body 210 is completely pushed into the drawer frame 310, the drawer cavity 311 is closed, and the vacuum pump 400 evacuates the closed drawer cavity 311, and the pressure inside the drawer cavity 311 decreases to achieve low-pressure fresh-keeping storage of the internal ingredients.

[0051] The vacuum pumping process of the vacuum pump 400 for the vacuum drawer 200 includes a vacuum pumping stage. During the vacuum pumping stage, the vacuum drawer 200 is converted from the open state to the closed state. The pressure inside the vacuum drawer 200 is greater than the first preset pressure threshold a. The vacuum pump 400 is turned on to pump the vacuum of the vacuum drawer 200, so that the pressure inside the vacuum drawer 200 drops to the second preset pressure threshold b to meet the low-pressure fresh-keeping storage requirements of the items.

[0052] The vacuum pumping process of the vacuum pump 400 for the vacuum drawer 200 further includes a pressure-holding stage. After the vacuum pumping stage ends, the vacuum drawer 200 enters the pressure-holding stage. During the pressure-holding stage, when the pressure inside the vacuum drawer 200 is released to the preset pressure value, the vacuum pump 400 is restarted to pump the vacuum of the vacuum drawer 200 again, so that the pressure inside the vacuum drawer 200 drops to the second preset pressure threshold b again.

[0053] Along with the vacuum pumping process, the pressure inside the vacuum drawer 200 decreases, which will cause the evaporation of the moisture in the food ingredients. Especially during the vacuum pumping process, the continuous change of the pressure value inside the vacuum drawer 200 causes the continuous change of the surface tension of the cell membrane of the food ingredients, accelerating the cell movement and the molecular movement inside the cells, thus being ineffective in preserving the freshness of the food ingredients.

[0054] To solve this technical problem, the refrigerator further includes an electromagnetic part 600. Refer to Figure 4 and Figure 5 , Figure 4 is a structural diagram of the vacuum drawer 200 after omitting the air duct part 500. Figure 5 is Figure 4 the enlarged view of part A in Figure 6 is an exploded view of the vacuum drawer 200. The electromagnetic part 600 is arranged on the vacuum drawer 200, and the electromagnetic part 600 is configured to make the storage cavity of the vacuum drawer 200 have a magnetic field.

[0055] The magnetic field fresh-keeping technology refers to inducing magnetization by the magnetobiological effect, making the water molecules in the food ingredients oriented orderly, reducing the enzyme activity, slowing down the physiological metabolism rate of fruits and vegetables and the deterioration of meat quality, which helps to improve the fresh-keeping effect.

[0056] The molecular-level principle of the magnetobiological effect is that diamagnetic substances widely exist in organisms, including water molecules, biological macromolecules, organic compounds, cell tissues, etc. The diamagnetic substances are induced to magnetize under the action of an external magnetic field, the molecules are oriented, the orderliness is improved, the movement of charges and charged particles inside the cells is affected, the activity of biological enzymes is reduced, and the metabolic activities of organisms are inhibited.

[0057] The magnetobiological effect has the following characteristics: hysteresis effect, the magnetic field action does not immediately produce a biological effect, and usually it takes a period of action to show the effect; window effect, the effect of the magnetic field on organisms is affected by its intensity, not the greater the better, and it will have a great impact on organisms only within a certain intensity range; amplification effect, a weak magnetic field can often stimulate a strong biological response; accumulation effect, the biological effects caused by multiple magnetic field actions will accumulate or superimpose.

[0058] Taking the storage of fruits and vegetables in the vacuum drawer 200 as an example, the temperature in the vacuum drawer 200 is between 0°C and 4°C. By adding the electromagnetic part 600, a magnetic field is generated in the vacuum drawer 200. At the molecular level of fruits and vegetables, macromolecules such as DNA and proteins are electric dipoles, and the magnetic field will affect gene expression, inhibit enzyme activity, and reduce the respiratory electron chain and energy metabolism. At the cellular level of fruits and vegetables, the permeability of the cell membrane changes, and the cell orientation and physiological activity change. At the organism level of fruits and vegetables, it is manifested as a decrease in the respiration rate, transpiration rate, and metabolic rate.

[0059] Taking the storage of fresh meat, fish and other ingredients in the vacuum drawer 200 as an example, the temperature in the vacuum drawer 200 is between -2°C and 0°C. By adding the electromagnetic part 600, a magnetic field is generated in the vacuum drawer 200. The magnetic field provides energy for nucleation, the nucleation radius becomes smaller; the orientation destroys the macromolecular clusters and strengthens the small molecular clusters; the system supercooling degree is reduced, so as to achieve the effects of forming more fine crystal nuclei and increasing the cooling rate, further achieving the effects of reducing the ice crystal size and shortening the freezing time, and then achieving the purpose of avoiding large ice crystals from piercing cells, reducing the juice loss, inhibiting the growth of microorganisms and enzyme activity, and improving the fresh-keeping effect of the ingredients.

[0060] The higher the magnetic induction intensity in the vacuum drawer 200, the better the improvement effect on the fresh-keeping effect of the ingredients. However, if the magnetic induction intensity is too high, it may cause molecular damage and increase the cost at the same time. For example, the cost includes energy consumption cost. A high magnetic induction intensity means that the electromagnetic part 600 needs to operate at a high power, resulting in an increase in energy consumption. Another example is that in order to obtain a high magnetic induction intensity, some schemes set multiple electromagnetic parts 600, increasing the cost of electrical components.

[0061] Moreover, a high magnetic induction intensity means that the operating power of the electromagnetic part 600 is high, and the electromagnetic part 600 generates a lot of heat. The heat will affect the low-temperature environment of the vacuum drawer 200, and then affect the fresh-keeping effect of the ingredients.

[0062] Therefore, it is necessary to optimize the specific working process of the electromagnetic part 600 so that the magnetic induction intensity in the vacuum drawer 200 can not only improve the fresh-keeping effect of the ingredients, but also effectively control the cost.

[0063] To achieve the above technical effects, the refrigerator further includes a controller configured to adjust the operating power of the electromagnetic unit 600 according to the vacuum pumping stage of the vacuum pump 400 for the vacuum drawer 200, so as to change the magnetic induction intensity in the storage cavity.

[0064] The fresh-keeping effect of the food ingredients in the vacuum drawer 200 is the result of the combined action of multiple factors such as pressure, temperature, and magnetic field. The vacuum pumping process of the vacuum pump 400 for the vacuum drawer 200 includes a vacuum pumping stage and a pressure holding stage. After the drawer is switched from the open state to the closed state, the vacuum pump 400 is turned on to pump the vacuum drawer 200. At this time, the temperature in the vacuum drawer 200 is not very low, and the pressure in the vacuum drawer 200 is not very low. To improve the fresh-keeping effect of the food ingredients during the vacuum pumping stage, the operating power of the electromagnetic unit 600 can be increased to increase the magnetic induction intensity in the vacuum drawer 200, and the high magnetic induction intensity is used to make up for the adverse effects of temperature and pressure on the fresh-keeping of the food ingredients during the vacuum pumping stage, thereby improving the overall fresh-keeping effect of the food ingredients.

[0065] After the vacuum pumping stage ends, the vacuum drawer 200 enters the pressure holding stage. At this time, the pressure and temperature in the vacuum drawer 200 have both dropped to a certain value. The low pressure and low temperature have a certain promoting effect on the fresh-keeping effect of the food ingredients. Then, the operating power of the electromagnetic unit 600 can be appropriately reduced. While ensuring the fresh-keeping effect of the food ingredients, it is possible to avoid cost increase and avoid the influence of the working heat of the electromagnetic unit 600 on the temperature of the vacuum drawer 200.

[0066] In some embodiments of the present application, the controller is configured to control the electromagnetic unit 600 to operate at a first operating power W1 when the vacuum pump 400 is operating, so that the magnetic induction intensity in the storage cavity is B1, specifically, the magnetic induction intensity at the central position of the storage cavity is B1.

[0067] The controller is further configured to control the electromagnetic unit 600 to operate at a second operating power W2 when the vacuum pump 400 stops, so that the magnetic induction intensity in the storage cavity is B2, specifically, the magnetic induction intensity at the central position of the storage cavity is B2. Wherein, W1 > W2 and B1 > B2.

[0068] After the vacuum drawer 200 is switched from the open state to the closed state, the vacuum pump 400 is turned on to pump the vacuum drawer 200. At this time, the temperature and pressure in the vacuum drawer 200 are not very low. To improve the fresh-keeping effect of the food ingredients at the beginning stage of vacuum pumping, the electromagnetic unit 600 operates at a high-power first operating power W1, so that the magnetic induction intensity at the central position of the storage cavity is B1, and the magnetic induction intensity in the vacuum drawer 200 is increased, improving the fresh-keeping effect of the food ingredients.

[0069] As the vacuum pumping progresses, both the pressure and temperature inside the vacuum drawer 200 continuously decrease. After the pressure inside the vacuum drawer 200 drops to the system-set value, the vacuum pump 400 stops. At this time, both the pressure and temperature inside the vacuum drawer 200 have dropped to a certain value. The low pressure and low temperature have a certain enhancing effect on the fresh-keeping effect of the food materials. Then, the electromagnetic part 600 operates at a second operating power W2 with low power, so that the magnetic induction intensity at the central position of the storage cavity is B2, and the magnetic induction intensity inside the vacuum drawer 200 decreases. While ensuring the fresh-keeping effect of the food materials, it can also avoid cost increase.

[0070] In some embodiments of the present application, the vacuum pumping process of the vacuum pump 400 for the vacuum drawer 200 includes a vacuum pumping stage and a pressure holding stage.

[0071] During the vacuum pumping stage, the vacuum pump 400 is turned on, and the pressure inside the vacuum drawer 200 drops to a second preset pressure threshold b, and the electromagnetic part 600 operates at the first operating power W1.

[0072] Specifically, during the vacuum pumping stage, after the vacuum drawer 200 is switched from the open state to the closed state, the vacuum pump 400 is turned on. At this time, the temperature and pressure inside the vacuum drawer 200 are not very low yet. To improve the fresh-keeping effect of the food materials at the beginning stage of vacuum pumping, the electromagnetic part 600 operates at the first operating power W1 with high power, so that the magnetic induction intensity at the central position of the storage cavity is B1, and the magnetic induction intensity inside the vacuum drawer 200 increases, enhancing the fresh-keeping effect of the food materials.

[0073] During the pressure holding stage, when the pressure inside the vacuum drawer 200 rises to a first preset pressure threshold a, the vacuum pump 400 is turned on to make the pressure inside the vacuum drawer 200 drop to the second preset pressure threshold b, and the electromagnetic part 600 operates at the second operating power W2.

[0074] Specifically, during the pressure holding stage, the pressure and temperature inside the vacuum drawer 200 have dropped to a certain value. The low pressure and low temperature have a certain enhancing effect on the fresh-keeping effect of the food materials. Then, the electromagnetic part 600 operates at the second operating power W2 with low power, so that the magnetic induction intensity at the central position of the storage cavity is B2, and the magnetic induction intensity inside the vacuum drawer 200 decreases. While ensuring the fresh-keeping effect of the food materials, it can also avoid cost increase.

[0075] In some embodiments of the present application, referring to Figure 9 , the vacuum pumping process of the vacuum pump 400 for the vacuum drawer 200 includes a first vacuum pumping stage, and the pressure inside the vacuum drawer 200 drops to the first preset pressure threshold a at the end of the first vacuum pumping stage.

[0076] The vacuum pumping process of the vacuum pump 400 for the vacuum drawer 200 further includes a second vacuum pumping stage, and the pressure inside the vacuum drawer 200 is reduced to a second preset pressure threshold b at the end of the second vacuum pumping stage. Wherein, a > b.

[0077] During the vacuum pumping stage, the vacuum pump sequentially performs a first vacuum pumping stage and a second vacuum pumping stage. The vacuum pumping process of the vacuum pump 400 for the vacuum drawer 200 is divided into two vacuum pumping stages. In the first vacuum pumping stage, the pressure inside the vacuum drawer 200 is not very low, and it is relatively easy for the vacuum pump 400 to pump the vacuum. In the second vacuum pumping stage, the pressure inside the vacuum drawer 200 is relatively low, and it is not easy for the vacuum pump 400 to pump the vacuum.

[0078] The vacuum pumping process of the vacuum pump 400 for the vacuum drawer 200 includes a first vacuum pumping stage. During the first vacuum pumping stage, the vacuum pump 400 starts to pump the vacuum of the vacuum drawer 200 in the atmospheric pressure state. When the pressure detection device detects that the pressure inside the vacuum drawer 200 reaches the first preset pressure threshold a, the running time of the vacuum pump 400 is T1.

[0079] The vacuum pumping process of the vacuum pump 400 for the vacuum drawer 200 includes a second vacuum pumping stage. During the second vacuum pumping stage, the vacuum pump 400 continues to run for a time T2 and then stops, so that the pressure inside the vacuum drawer 200 reaches the second preset pressure threshold b. Wherein, a > b, and T2 = (1 - 2) × T1.

[0080] Specifically, the vacuum pumping process of the vacuum pump 400 for the vacuum drawer 200 is divided into two stages, namely the first vacuum pumping stage and the second vacuum pumping stage. First, the first vacuum pumping stage is carried out, and then the second vacuum pumping stage is carried out.

[0081] During the first vacuum pumping stage, as the vacuum pump 400 continuously pumps the vacuum of the vacuum drawer 200, the pressure inside the vacuum drawer 200 continuously decreases. At this time, the pressure inside the vacuum drawer 200 is detected by the pressure detection device. When the pressure inside the vacuum drawer 200 reaches the first preset pressure threshold a, the first vacuum pumping stage ends, and then the second vacuum pumping stage is carried out. During the first vacuum pumping stage, the running time of the vacuum pump 400 is T1.

[0082] During the second vacuum pumping stage, the vacuum pump 400 continues to pump the vacuum of the vacuum drawer 200, and the pressure inside the vacuum drawer 200 continuously decreases. When the vacuum pump 400 automatically stops after continuing to run for a time T2 during the second vacuum pumping stage, the pressure inside the vacuum drawer 200 can reach the second preset pressure threshold b, reaching the low-pressure environment required for low-pressure fresh-keeping storage of food.

[0083] In the related art, the running time T2 of the vacuum pump 400 in the second vacuum pumping stage is a fixed value. However, when there are many items loaded in the vacuum drawer 200 or it is fully loaded, if the vacuum drawer 200 is vacuum pumped according to the fixed time T2 in the second vacuum pumping stage, the pressure in the vacuum drawer 200 will be too low, easily causing the drawer to deform and be damaged.

[0084] To solve this technical problem, the present application correlates the running time T2 of the vacuum pump 400 in the second vacuum pumping stage with the running time T1 of the vacuum pump 400 in the first vacuum pumping stage, specifically T2 = (1 - 2) × T1.

[0085] In this way, the running time of the vacuum pump 400 in the second vacuum pumping stage is not fixed, to avoid the situation of too low pressure in the vacuum drawer 200 during the vacuum pumping process.

[0086] In some embodiments of the present application, in the first vacuum pumping stage and the second vacuum pumping stage, the electromagnetic part 600 operates at the first operating power W1, that is, the electromagnetic part 600 operates at a high power, to increase the magnetic induction intensity in the vacuum drawer 200 and improve the food preservation effect.

[0087] Refer to Figure 10 , a working control process of the refrigerator includes: S1, the vacuum drawer 200 is converted from the open state to the closed state, the vacuum pump 400 is turned on, and the vacuum drawer 200 is vacuum pumped; S2, the vacuum drawer 200 enters the first vacuum pumping stage, the pressure in the vacuum drawer 200 drops to the first preset pressure threshold a, the electromagnetic part 600 operates at the first operating power W1, and the magnetic induction intensity in the storage cavity is B1; S3, the vacuum drawer 200 enters the second vacuum pumping stage, the pressure in the vacuum drawer 200 drops to the second preset pressure threshold b, the electromagnetic part 600 operates at the first operating power W1, and the magnetic induction intensity in the storage cavity is B1; S4, the vacuum drawer 200 enters the pressure holding stage, the electromagnetic part 600 operates at the second operating power W1, and the magnetic induction intensity in the storage cavity is B2.

[0088] In some embodiments of the present application, in the vacuum pumping stage, the first operating power W1 is 64 - 100% of the rated power of the electromagnetic part 600, and the magnetic induction intensity B1 at the center of the storage cavity satisfies 4mT ≤ B1 ≤ 5mT.

[0089] Specifically, during the vacuuming stage, after the vacuum drawer 200 is converted from an open state to a closed state, the vacuum pump 400 is turned on. In order to improve the food preservation effect in the initial stage of vacuuming, the electromagnetic part 600 operates at 64-100% of its rated power to make the magnetic induction intensity B1 ≥ 4mT and B1 ≤ 5mT at the center of the storage cavity, thereby improving the food preservation effect.

[0090] If B1 > 5 mT, the magnetic induction intensity inside the vacuum drawer 200 is strong, increasing energy consumption and heat generation, affecting the low-temperature environment of the vacuum drawer 200. If B1 < 4 mT, the magnetic induction intensity inside the vacuum drawer 200 is weak, and when the pressure and temperature inside the vacuum drawer 200 do not reach the set values, it is not conducive to keeping food fresh.

[0091] During the pressure maintaining stage, the second operating power W2 is 4-16% of the rated power of the electromagnetic part 600 , and the magnetic induction intensity B2 at the center of the storage cavity is ≥1 mT and B2 ≤2 mT.

[0092] Specifically, during the pressure-maintaining stage, the pressure and temperature in the vacuum drawer 200 have been reduced to a certain value. Low pressure and low temperature have a certain effect on improving the food preservation effect. At this time, the electromagnetic part 600 operates at 4-16% W2 of its rated power to make the magnetic induction intensity B2 ≥ 1mT and B2 ≤ 2mT at the center of the storage cavity, which can ensure the food preservation effect while avoiding cost increases.

[0093] During the pressure-holding phase, the pressure and temperature in the vacuum drawer 200 drop to the set values. This, combined with the weaker magnetic induction intensity, can enhance food preservation. If B2 > 2mT, energy consumption increases; if B2 < 1mT, food preservation is reduced.

[0094] Figure 11 The following table shows the weight loss rate of different fruits and vegetables under different magnetic fields in the vacuum drawer 200. From the data comparison table, it can be concluded that during the pressure holding stage, when the magnetic induction intensity in the vacuum drawer 200 is between 1-2 mT, the 7-day weight loss rate of fruits and vegetables is low, and the preservation effect is good.

[0095] Figure 12 The data of beef juice loss rate when there are different magnetic fields in the vacuum drawer 200 are shown. Figure 13 The TVBN content data of beef when there are different magnetic fields in the vacuum drawer 200. Figure 14 The data of juice loss rate of salmon when there are different magnetic fields in the vacuum drawer 200 are shown. Figure 15 The TVBN content data of salmon in different magnetic fields in the vacuum drawer 200 are shown. Figures 12 to 15It can be concluded that during the pressure holding stage, the magnetic induction intensity for fresh storage of meat is not the higher the better. When the magnetic induction intensity is between 1 - 2 mT, the juice loss rate of meat is low and the TVBN content is low.

[0096] In some embodiments of the present application, referring to Figure 4 , the electromagnetic part 600 is arranged at the top and / or bottom of the drawer frame 310. For example, the electromagnetic part 600 is arranged at the top of the drawer frame 310. Another example is that the electromagnetic part 600 is arranged at the bottom of the drawer frame 310. Another example is that the electromagnetic part 600 is respectively arranged at both the top and bottom of the drawer frame 310.

[0097] The magnetic induction intensity generated by the electromagnetic part 600 in the vacuum drawer 200 decreases as the distance from the electromagnetic part 600 increases. When the electromagnetic part 600 is arranged at both the top and bottom of the drawer frame 310, it helps to improve the uniformity of the magnetic induction intensity in the vacuum drawer 200, but it will increase the cost.

[0098] Condensation will occur in the vacuum drawer 200 in a refrigerated environment. If the electromagnetic part 600 is arranged at the bottom of the drawer frame 310, the downward flowing condensation will reduce the reliability of the electromagnetic part 600.

[0099] In some embodiments of the present application, referring to Figure 7 and Figure 8 , a first reinforcing rib group 313 is arranged on the top wall of the drawer frame 310. The first reinforcing rib group 313 includes a plurality of circumferential ribs 3131 and a plurality of radial ribs 3132. The circumferential ribs 3131 extend annularly around the central position of the first reinforcing rib group 313, and the radial ribs 3132 extend along the radial direction of the circumferential ribs 3131. The first reinforcing rib group 313 forms a structure similar to a "sun rib".

[0100] A second reinforcing rib group 314 is arranged on the top wall of the drawer frame 310, close to the opening 312 of the drawer frame 310. The second reinforcing rib group 314 includes a transverse rib 3141 and a longitudinal rib 3142. The transverse rib 3141 extends substantially along the width direction of the drawer frame 310, and the longitudinal rib 3142 extends substantially along the length direction of the drawer frame 310.

[0101] The first reinforcing rib group 313 and the second reinforcing rib group 314 are arranged in sequence along the length direction of the drawer frame 310. The first reinforcing rib group 313 is on the side away from the opening 312 of the drawer frame 310, and the second reinforcing rib group 314 is closer to the opening 312 of the drawer frame 310 than the first reinforcing rib group 313.

[0102] Due to the front end of the drawer frame 310 being open (312), during the vacuum pumping process, the part of the drawer frame 310 close to the opening 312 deforms significantly. Therefore, a second reinforcing rib group 314 is provided on the top and bottom walls of the drawer frame 310 on the side close to the opening 312. The transverse ribs 3141 and longitudinal ribs 3142 of the second reinforcing rib group 314 are densely distributed, thereby increasing the structural strength of the drawer frame 310 on the side close to the opening 312.

[0103] The first reinforcing rib group 314 is slightly away from the front end opening (312) of the drawer frame 310. The first reinforcing rib group 313 is composed of circumferential ribs 3131 and radial ribs 3132, presenting a "sun-shaped rib" structural form. The first reinforcing rib group 314 has a large spreading area, and the central position of the first reinforcing rib group 313 is closer to the rear end of the drawer frame 310 compared to the geometric center position of the drawer frame 310.

[0104] In some embodiments of the present application, referring to Figures 4 to 6 , the electromagnetic part 600 is an electromagnetic coil 610, and the electromagnetic coil 610 is disposed around between two adjacent circumferential ribs 3131. The installation of the electromagnetic coil 610 makes full use of the space between two adjacent circumferential ribs 3131, with a compact structure and convenient installation.

[0105] A card slot 315 is provided on the radial rib 3132 between two adjacent circumferential ribs 3131, and the electromagnetic coil 610 is clamped in the card slot 315. The electromagnetic coil 610 is installed in an embedded clamping manner, which is convenient for installation and has a compact structure.

[0106] In some embodiments of the present application, an electromagnetic part 600 is provided on the top of the drawer frame 310, and a magnetic core (not shown) is provided on the bottom of the drawer frame 310. Using a magnetic core with a high magnetic permeability can significantly enhance the magnetic field. The magnetic core materials that can be used include, but are not limited to, ferrite, silicon steel sheet, amorphous magnetic materials, etc.

[0107] By providing a magnetic core on the bottom of the drawer frame 310, while significantly increasing the magnetic induction intensity and uniformity in the vacuum drawer 200, it will not additionally increase too much cost.

[0108] In some embodiments of the present application, during the vacuum pumping stage, the vacuum pump 400 operates, and the electromagnetic coil 610 operates at a high power. The high power is specifically 80% - 100% of the rated voltage (i.e., 64% - 100% of the rated power), so that the magnetic induction intensity at the central position in the vacuum drawer 200 is 4mT - 5mT.

[0109] During the pressure holding stage, the vacuum pump 400 stops, and the electromagnetic coil 610 operates at a low power. The low power is specifically 20% - 40% of the rated voltage (i.e., 4% - 16% of the rated power), so that the magnetic induction intensity at the central position in the vacuum drawer 200 is 1mT - 2mT.

[0110] In some embodiments of the present application, the vacuum pump 400 and the electromagnetic coil 610 are controlled by the controller respectively. When the vacuum pump 400 operates, the vacuum pump 400 transmits a digital signal with a high level to the controller. After the controller recognizes the signal, it increases the output voltage of the power supply unit of the electromagnetic coil 610, so that the electromagnetic coil 610 operates at a high power.

[0111] When the vacuum pump 400 stops, the vacuum pump 400 transmits a digital signal with a low level to the controller. After the controller recognizes the signal, it decreases the output voltage of the power supply unit of the electromagnetic coil 610, so that the electromagnetic coil 610 operates at a low power.

[0112] In some embodiments of the present application, referring to Figure 2 and Figure 3 , the vacuum drawer 200 further includes an air duct portion 500, and the air duct portion 500 is configured to convey cold air into the space where the drawer frame 310 is located. A damper (not shown) is provided in the air duct portion 500, and the controller is further configured to control the opening or closing of the damper according to the temperature in the drawer cavity 311, so that the vacuum drawer 200 is in a suitable temperature environment.

[0113] An air duct cavity 530 is formed inside the air duct portion 500. An air inlet 520 and an air outlet are provided on the air duct portion 500. The air duct cavity 530 is located at the top of the drawer frame 310. The air inlet 520 communicates the air duct cavity 530 with the air duct of the refrigerator. The air outlet communicates with the air duct cavity 530. The cold air in the air duct of the refrigerator enters the air duct cavity 530 through the air inlet 520, and then flows out from the air outlet. The cold air blows to the outer periphery of the drawer frame 310 to provide a low-temperature environment for the vacuum drawer 200.

[0114] In some embodiments of the present application, referring to Figure 3 , the air duct portion 500 is provided with a ventilation opening 510 at a position facing the electromagnetic portion 600, and the ventilation opening 510 serves as the air outlet. That is, the air duct portion 500 is provided with a plurality of ventilation openings 510 on the side facing the drawer frame 310, and the plurality of ventilation openings 510 face the electromagnetic coil 610. The cold air flowing out from the ventilation openings 510 can directly blow the electromagnetic coil 610, improving the cooling effect on the electromagnetic coil 610.

[0115] In some embodiments of the present application, during the vacuum pumping stage, the electromagnetic coil 610 continuously operates at a high power, and the electromagnetic coil 610 will generate heat, resulting in an increase in the temperature inside the vacuum drawer 200. To solve this technical problem, after the vacuum pump 400 evacuates the vacuum drawer 200 so that the pressure in the storage cavity drops to the second preset pressure threshold b, the damper opens, and cold air is used to cool the electromagnetic coil 610, avoiding the heat generated by the electromagnetic coil 610 from affecting the low-temperature environment of the vacuum drawer 200.

[0116] In some embodiments of the present application, when the vacuum drawer 200 maintains pressure for 24 h to 48 h, condensation or frosting will occur on the top of the vacuum drawer 200, and the condensed water drops on the food materials, causing the food materials to spoil and deteriorate.

[0117] To solve this technical problem, during the pressure-holding stage, after every set time T0, the electromagnetic part 600 operates at the first operating power W1 for a time t0 and then stops, and the heat generated by the electromagnetic part 600 is used to volatilize the condensation generated by the vacuum drawer 200.

[0118] For example, during the pressure-holding stage, every 24 h, the electromagnetic coil 610 operates at the first operating power W of high power for 30 minutes, and the electromagnetic coil 610 operates at low power for the rest of the time.

[0119] In some embodiments of the present application, when the number of times the vacuum drawer 200 is opened within the set time is greater than K, the operating time of the electromagnetic part 600 at the first operating power W1 is extended.

[0120] For example, if the number of times the vacuum drawer 200 is opened within the set time of 12 hours is greater than 4 times, the system considers that the vacuum drawer 200 is frequently opened and the condensation will be aggravated, so the operating time of the electromagnetic part 600 at high power is extended to improve the volatilization effect of the condensation.

[0121] In the description of the above embodiments, the specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0122] The above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A refrigerator, comprising: A cabinet, within which a storage space is formed; A door body, which is configured to close or open the storage space; It is characterized in that The refrigerator further comprises: A vacuum drawer, which is arranged in the storage space and within which a storage cavity is formed; An electromagnetic part, which is arranged on the vacuum drawer and is configured to make there be a magnetic field within the storage cavity; A vacuum pump, which is configured to evacuate the vacuum drawer; A controller, which is configured to control the electromagnetic part to operate at a first operating power W1 when the vacuum pump is running, so that the magnetic induction intensity within the storage cavity is B1; the controller is further configured to control the electromagnetic part to operate at a second operating power W2 when the vacuum pump stops, so that the magnetic induction intensity within the storage cavity is B2; wherein, W1 > W2, B1 > B2.

2. The refrigerator according to claim 1, wherein: The process of the vacuum pump evacuating the vacuum drawer includes an evacuation stage and a pressure holding stage; Within the evacuation stage, the vacuum pump is turned on, the pressure within the vacuum drawer drops to a second preset pressure threshold b, and the electromagnetic part operates at the first operating power W1; Within the pressure holding stage, when the pressure within the vacuum drawer rises to a first preset pressure threshold a, the vacuum pump is turned on so that the pressure within the vacuum drawer drops to the second preset pressure threshold b, and the electromagnetic part operates at the second operating power W2.

3. The refrigerator according to claim 2, wherein: Within the pressure holding stage, after every set time T0, the electromagnetic part operates at the first operating power W1 for a time t0 and then stops.

4. The refrigerator according to claim 2, wherein: When the number of times the vacuum drawer is opened within a set time is greater than K, the operating time of the electromagnetic part at the first operating power W1 is prolonged.

5. The refrigerator according to claim 2, wherein: Within the evacuation stage, the first operating power W1 is 64 - 100% of the rated power of the electromagnetic part, and the magnetic induction intensity B1 at the center of the storage cavity satisfies B1 ≥ 4mT and B1 ≤ 5mT; Within the pressure holding stage, the second operating power W2 is 4 - 16% of the rated power of the electromagnetic part, and the magnetic induction intensity B2 at the center of the storage cavity satisfies B2 ≥ 1mT and B2 ≤ 2mT.

6. The refrigerator according to any one of claims 1 to 5, wherein: The vacuum drawer comprises: A drawer frame body, within which a drawer cavity with an open end is formed; A drawer body, which is configured to be slidably arranged within the drawer cavity through the open end; Wherein, the electromagnetic part is arranged on the top and / or bottom of the drawer frame body.

7. The refrigerator according to claim 6, wherein: A first reinforcing rib group is provided on the top wall of the drawer housing. The first reinforcing rib group includes a plurality of circumferential ribs and a plurality of radial ribs. The circumferential ribs extend annularly around the central position of the first reinforcing rib group, and the radial ribs extend radially along the circumferential ribs. The electromagnetic part is an electromagnetic coil, and the electromagnetic coil is disposed around between two adjacent circumferential ribs.

8. The refrigerator according to claim 6, wherein The vacuum drawer further includes an air duct part configured to convey cold air into the space where the drawer housing is located. An air door is provided on the air duct part, and the controller is further configured to control the opening or closing of the air door according to the temperature in the drawer cavity. After the vacuum pump evacuates the vacuum drawer to make the pressure in the storage cavity drop to a second preset pressure threshold b, the air door opens.

9. The refrigerator according to claim 8, wherein The air duct part is provided with a ventilation opening at a position facing the electromagnetic part.

10. A refrigerator, comprising: A cabinet, a storage space is formed inside the cabinet; A door body configured to close or open the storage space; It is characterized in that The refrigerator further includes: A vacuum drawer disposed in the storage space, and a storage cavity is formed inside the vacuum drawer; An electromagnetic part disposed on the vacuum drawer and configured to make a magnetic field in the storage cavity; A vacuum pump configured to evacuate the vacuum drawer; A controller configured to adjust the operating power of the electromagnetic part according to the evacuation stage of the vacuum pump for the vacuum drawer, so as to change the magnetic induction intensity in the storage cavity.

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