Magnetic field fresh-keeping assembly and refrigerator

Abstract

The utility model provides a magnetic field fresh-keeping assembly and a refrigerator, the refrigerator comprises a refrigerating chamber and a freezing chamber, a storage drawer is arranged in the refrigerating chamber, the magnetic field fresh-keeping assembly comprises a magnetic field generation device, a magnetic field control device and a control device, the magnetic field generation device is arranged in the refrigerating chamber and is adjacent to the storage drawer, and the magnetic field generation device is used for applying a magnetic field to the interior of the storage drawer; and the cooling circulation pipeline is filled with a coolant, and the coolant sequentially flows through the freezing chamber and the magnetic field generating device and exchanges heat with the freezing chamber and the magnetic field generating device so that the magnetic field generating device can be cooled. According to the magnetic field fresh-keeping assembly, due to the fact that the temperature of the magnetic field generating device is higher than the temperature in the freezing chamber, when heat exchange is conducted between the coolant and the magnetic field generating device, the temperature of the coolant is increased, and the temperature of the magnetic field generating device is reduced; the magnetic field generating device is cooled by using cold energy in the freezing chamber.

Description

Technical Field

[0001] This application belongs to the field of refrigerator technology, and in particular relates to a magnetic field preservation component and a refrigerator. Background Technology

[0002] In the existing technology, some refrigerators are equipped with a magnetic field generator. The magnetic field generator applies a magnetic field to the drawer and utilizes the properties of the magnetic field, such as inhibiting the growth of microorganisms, slowing down enzyme activity, and improving cell membrane stability, to extend the shelf life of food and improve the preservation effect.

[0003] However, magnetic field generators typically generate heat when in operation, which in turn raises the ambient temperature around the generator. Since the magnetic field generator in a refrigerator is usually located in the storage compartment, the heat generated by the generator will cause the temperature inside the storage compartment to rise, affecting the storage efficiency. Utility Model Content

[0004] This application provides a magnetic field preservation component and a refrigerator to solve the problem that the heat generated by the magnetic field generator in existing refrigerators during operation can cause the temperature inside the storage compartment to rise, affecting the storage effect of the storage compartment.

[0005] This application provides a magnetic field preservation component for use in a refrigerator, which includes a refrigerator compartment and a freezer compartment. The refrigerator compartment is provided with a storage drawer. The magnetic field preservation component includes:

[0006] A magnetic field generating device is installed in the refrigerator compartment and adjacent to the storage drawer. The magnetic field generating device is used to apply a magnetic field to the storage drawer.

[0007] A cooling circulation pipeline is provided, which is filled with a cold storage agent. The cold storage agent flows sequentially through the freezer and the magnetic field generating device, and exchanges heat with the freezer and the magnetic field generating device respectively, so as to cool the magnetic field generating device.

[0008] Optionally, the cooling circulation pipeline includes:

[0009] A cold storage chamber is located inside the freezer chamber;

[0010] A heat exchange tube is inserted into the magnetic field generating device, and at least one end of the heat exchange tube is connected to the cold storage chamber.

[0011] Optionally, the cooling circulation pipeline further includes a heat exchange chamber, which is disposed in the refrigerator compartment and adjacent to the storage drawer;

[0012] The two ends of the heat exchange tube are respectively connected to the cold storage chamber and the heat exchange chamber.

[0013] Optionally, the cooling circulation pipeline further includes:

[0014] A connecting pipe connects the cold storage chamber and the heat exchange chamber;

[0015] A circulation pump is installed on the connecting pipe, and the circulation pump is used to drive the refrigerant to flow from the heat exchange chamber to the cold storage chamber.

[0016] Optionally, it also includes a temperature detection element, which is disposed on the magnetic field generating device. When the detection result of the temperature detection element is greater than a preset temperature, the circulation pump is turned on.

[0017] Optionally, the magnetic field generating device includes a coil unit, the coil unit being ring-shaped and having a through hole;

[0018] The heat exchange tube passes through the perforation.

[0019] Optionally, the coil unit is provided with a plurality of perforations at intervals, and the cooling circulation pipeline includes a plurality of heat exchange tubes, each heat exchange tube being provided with one perforation, and each heat exchange tube being connected to the cold storage chamber.

[0020] Optionally, the heat exchange chamber is sandwiched between the magnetic field generating device and the storage drawer.

[0021] Optionally, the cold storage chamber is located inside the refrigeration chamber on the side near the magnetic field generating device.

[0022] This application also provides a refrigerator, including:

[0023] The refrigerator compartment is equipped with storage drawers;

[0024] Freezer compartment;

[0025] As described above, the magnetic field preservation component includes:

[0026] A magnetic field generating device is installed in the refrigerator compartment and adjacent to the storage drawer. The magnetic field generating device is used to apply a magnetic field to the storage drawer.

[0027] A cooling circulation pipeline is provided, which is filled with a cold storage agent. The cold storage agent flows sequentially through the freezer and the magnetic field generating device, and exchanges heat with the freezer and the magnetic field generating device respectively, so as to cool the magnetic field generating device.

[0028] The magnetic field preservation component provided in this application embodiment allows the refrigerant in the cooling circulation pipeline to flow sequentially through the freezer compartment and the magnetic field generator. When the refrigerant flows through the freezer compartment, it first exchanges heat with the freezer compartment. Because the temperature inside the freezer compartment is lower, the temperature of the refrigerant decreases during this heat exchange. Then, the refrigerant flows through the magnetic field generator and exchanges heat with it. Because the temperature of the magnetic field generator is higher than the temperature inside the freezer compartment, the temperature of the refrigerant increases while the temperature of the magnetic field generator decreases during this heat exchange. By circulating the refrigerant in the cooling circulation pipeline, the cold air inside the freezer compartment is used to cool the magnetic field generator, preventing the heat generated by the magnetic field generator during operation from causing the temperature inside the freezer compartment to rise and thus avoiding affecting the storage effect of the food. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0031] Figure 1 This is a schematic diagram of the installation of the magnetic field preservation component provided in the embodiments of this application.

[0032] Figure 2 This is a schematic diagram of the structure of the magnetic field preservation component provided in the embodiments of this application.

[0033] Figure 3 A schematic diagram of the cooling circulation pipeline of the magnetic field preservation component provided in this application embodiment.

[0034] Figure 4 This is a schematic diagram of the installation of the coil unit and heat exchange tube of the magnetic field preservation component provided in the embodiments of this application.

[0035] Figure 5 This is a schematic diagram of the structure of a refrigerator provided in an embodiment of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Freezer compartment;

[0038] 2. Refrigerator compartment; 21. Storage drawers;

[0039] 3. Coil unit; 31. Through hole;

[0040] 4. Cooling circulation pipeline; 41. Cold storage chamber; 42. Heat exchange tube; 43. Heat exchange chamber; 44. Connecting pipe; 45. Circulation pump. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0042] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0046] This application provides a magnetic field preservation component and a refrigerator to solve the problem that the heat generated by the magnetic field generator in existing refrigerators during operation can cause the temperature inside the storage compartment to rise, affecting the storage effect of the storage compartment. The following will be described in conjunction with the accompanying drawings.

[0047] The magnetic field preservation component provided in this application embodiment is applied to a refrigerator. Please refer to [link / reference]. Figure 1 , Figure 1 This is a schematic diagram of the installation of the magnetic field preservation component provided in this application embodiment. The refrigerator includes a refrigerator compartment 2 and a freezer compartment 1. The refrigerator compartment 2 is provided with a storage drawer 21. The magnetic field preservation component includes a magnetic field generating device and a cooling circulation pipe 4. The magnetic field generating device is located in the refrigerator compartment 2 and adjacent to the storage drawer 21. The magnetic field generating device is used to apply a magnetic field to the storage drawer 21. The cooling circulation pipe 4 is filled with a cold storage agent, which flows sequentially through the freezer compartment 1 and the magnetic field generating device, and exchanges heat with the freezer compartment 1 and the magnetic field generating device respectively, so as to cool the magnetic field generating device.

[0048] The magnetic field preservation component provided in this application embodiment allows the refrigerant in the cooling circulation pipe 4 to flow sequentially through the freezer compartment 1 and the magnetic field generating device. When the refrigerant flows through the freezer compartment 1, it first exchanges heat with the freezer compartment 1. Because the temperature inside the freezer compartment 1 is low, the temperature of the refrigerant decreases during this heat exchange. Then, the refrigerant flows through the magnetic field generating device and exchanges heat with it. Because the temperature of the magnetic field generating device is higher than the temperature inside the freezer compartment 1, the temperature of the refrigerant increases while the temperature of the magnetic field generating device decreases during this heat exchange. By circulating the refrigerant in the cooling circulation pipe 4, the cold air inside the freezer compartment 1 is used to cool the magnetic field generating device, preventing the heat generated by the magnetic field generating device from causing the temperature inside the refrigerator compartment 2 to rise, thus avoiding affecting the storage effect of the food.

[0049] The type of cold storage agent is not further limited here; for example, it can be a solution such as ethanol, sodium chloride, propylene glycol, or PTFE dispersion.

[0050] Optionally, please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the magnetic field preservation component provided in the embodiments of this application. Figure 3 This is a schematic diagram of the cooling circulation pipeline of the magnetic field preservation component provided in this application embodiment. The cooling circulation pipeline 4 includes a cold storage chamber 41 and a heat exchange pipe 42. The cold storage chamber 41 is disposed inside the freezing chamber 1; the heat exchange pipe 42 passes through the magnetic field generating device, and at least one end of the heat exchange pipe 42 is connected to the cold storage chamber 41. The refrigerant circulates in the cold storage chamber 41 and the heat exchange pipe 42. In one specific embodiment, both ends of the heat exchange pipe 42 are connected to the cold storage chamber 41.

[0051] By providing a cold storage chamber 41 within the freezer chamber 1, more flow space is provided for the refrigerant within the freezer chamber 1, thereby improving the heat exchange efficiency of the cooling circulation pipeline 4 within the freezer chamber 1 and accelerating the cooling rate of the refrigerant. This allows the cooled refrigerant to enter the heat exchange tube 42 for further heat exchange with the magnetic field generating device. The shape of the cold storage chamber 41 is not further limited here; in some examples, it can be plate-shaped to improve the heat exchange efficiency between the refrigerant within the cold storage chamber 41 and the freezer chamber 1.

[0052] Optionally, the cooling circulation pipeline 4 also includes a heat exchange chamber 43, which is located inside the refrigerator compartment 2 and adjacent to the storage drawer 21; the two ends of the heat exchange pipe 42 are respectively connected to the cold storage chamber 41 and the heat exchange chamber 43. That is, the refrigerant in the cooling circulation pipeline 4 flows sequentially through the cold storage chamber 41, the magnetic field generating device and the heat exchange chamber 43.

[0053] When the refrigerant flows through the refrigerant storage chamber 41, it exchanges heat with the freezer compartment 1, thus lowering its temperature. Subsequently, the refrigerant flows through the heat exchange tube 42, exchanging heat with the magnetic field generating device, causing the magnetic field generating device to cool down and the refrigerant to relatively heat up. However, the temperature inside the heat exchange tube 42 is still higher than the temperature inside the freezer compartment 2. Therefore, when the refrigerant in the heat exchange tube 42 further flows through the heat exchange chamber 43, the temperature of the heat exchange chamber 43 is lower than the temperature inside the freezer compartment 2. Thus, the refrigerant in the heat exchange chamber 43 will further exchange heat with the air surrounding the heat exchange chamber 43, thereby improving the temperature of the heat exchange chamber 43. The surrounding air is cooled, and the heat exchange chamber 43 and the magnetic field generator are both located in and adjacent to the cold storage compartment 2. Therefore, the heat exchange function of the heat exchange chamber 43 reduces the ambient temperature around the heat exchange chamber 43 and the magnetic field generator. By reducing the ambient temperature around the magnetic field generator, the air around the magnetic field generator exchanges heat with the magnetic field generator, thus further cooling the magnetic field generator. This improves the cooling effect of the cooling circulation pipeline 4 on the magnetic field generator and avoids the temperature rise of the magnetic field generator from affecting the storage effect of the cold storage compartment 2.

[0054] In some examples, the heat exchange chamber 43 may be plate-shaped.

[0055] Optionally, the cooling circulation pipeline 4 also includes a connecting pipe 44 and a circulation pump 45. The connecting pipe 44 connects the cold storage chamber 41 and the heat exchange chamber 43; the circulation pump 45 is disposed on the connecting pipe 44 and is used to drive the refrigerant to flow from the heat exchange chamber 43 to the cold storage chamber 41. In some examples, the circulation pump 45 may be disposed inside the cold storage chamber 2.

[0056] By providing a connecting pipe 44, an installation structure is provided for the circulating pump 45. The circulating pump 45 enables the refrigerant to circulate in the cooling circulation pipeline 4 via the connecting pipe 44, the refrigerant storage chamber 41, the heat exchange pipe 42, the heat exchange chamber 43, and the connecting pipe 44. Different pumps at different locations within the cooling circulation pipeline 4 perform different functions, ultimately achieving the effect of cooling the magnetic field generating device using the cooling capacity of the freezer chamber 1. The specific type of circulating pump 45 is not further limited here; it can be selected according to the specific application.

[0057] Optionally, the magnetic field preservation component provided in this application embodiment further includes a temperature detection element, which is disposed on the magnetic field generating device. When the temperature detection result is higher than a preset temperature, the circulation pump 45 is turned on. In some examples, the temperature detection element can be a temperature sensor. The specific value of the preset temperature is not further limited here, and can be obtained through multiple experiments.

[0058] When the temperature sensor reading is higher than the preset temperature, it indicates that the magnetic field generator is at a high temperature, which may cause a significant temperature rise in the refrigerator compartment 2, affecting the preservation of food. Therefore, the circulation pump 45 is activated to allow the refrigerant to circulate in the cooling circulation pipe 4, utilizing the cooling capacity of the freezer compartment 1 to cool the magnetic field generator and prevent a significant temperature rise in the refrigerator compartment 2. Conversely, when the temperature sensor reading is lower than or equal to the preset temperature, it indicates that the temperature of the magnetic field generator is within a suitable range and will not significantly increase the load on the refrigerator compartment 2. Therefore, cooling the magnetic field generator is unnecessary in this case, achieving intelligent management of the temperature rise of the magnetic field generator.

[0059] As an alternative implementation, the temperature sensing element can also be installed on the heat exchange chamber 43 for easy installation.

[0060] Optionally, when the magnetic field generating device is turned on for a first preset duration, the circulating pump 45 can also be turned on to compensate for the error in the detection result of the temperature detection element, and the circulating pump 45 can be turned off when the circulating pump 45 is turned on for a second preset duration.

[0061] Optionally, please refer to Figure 4 , Figure 4 This is a schematic diagram of the installation of the coil unit and heat exchange tube of the magnetic field preservation assembly provided in this application embodiment. The magnetic field generating device includes a coil unit 3, which is ring-shaped and has a through hole 31; the heat exchange tube 42 passes through the through hole 31. In some examples, the coil unit 3 is a single-layer ring-shaped sheet structure (not shown in the figure); in other examples, the coil unit 3 is a multi-layer ring-shaped sheet structure, such as... Figure 2 and Figure 4 As shown, multiple ring-shaped sheet structures are stacked sequentially and connected end-to-end. The perforations 31 on each coil unit 3 are positioned opposite each other, allowing the heat exchange tubes 42 to pass through multiple perforations 31 sequentially. Specifically, the number of layers in the coil unit 3 is determined by the required magnetic field strength; in some examples, the required magnetic field strength is typically between 2 and 20 mT. The coil unit 3 can be made of copper, aluminum, or copper-clad aluminum, etc. This type of coil unit 3 structure also offers higher reliability.

[0062] Optionally, the coil unit 3 is provided with multiple perforations 31 at intervals, and the cooling circulation pipeline 4 includes multiple heat exchange tubes 42. Each heat exchange tube 42 is provided with a perforation 31, and each heat exchange tube 42 is connected to the cold storage chamber 41. Specifically, multiple heat exchange tubes 42 are connected to both the heat exchange chamber 43 and the cold storage chamber 41. By increasing the number of heat exchange tubes 42, the cooling rate of the coil unit 3 is increased. At the same time, since the number of heat exchange tubes 42 increases, the diameter of each heat exchange tube 42 can be relatively small, avoiding the situation where a large diameter of the heat exchange tube 42 leads to an excessively large diameter of the perforation 31, which would have a significant impact on the wiring of the coil unit 3.

[0063] Optionally, the heat exchange chamber 43 is sandwiched between the magnetic field generating device and the storage drawer 21. Since the temperature of the heat exchange chamber 43 is lower than the temperature inside the refrigerator compartment 2, by placing the heat exchange chamber 43 on the side closer to the storage drawer 21, the ambient temperature around the storage drawer 21 can be cooled down first, reducing the direct temperature rise of the storage drawer 21 caused by the temperature rise of the magnetic field generating device.

[0064] Furthermore, the heat exchange chamber 43 can be located near the bottom of the storage drawer 21, and the coil unit 3 is located on the side of the heat exchange chamber 43 away from the storage drawer 21.

[0065] Optionally, the cold storage chamber 41 is located on the side of the refrigeration chamber 1 near the magnetic field generating device to reduce the cold loss of the cold storage agent during the flow to the heat exchange tube 42.

[0066] As an alternative implementation, the cold storage compartment 2 in this embodiment can also be replaced with a variable temperature compartment.

[0067] This application also provides a refrigerator; please refer to [link / reference]. Figure 5 , Figure 5 The schematic diagram of the refrigerator provided in this application embodiment shows that the refrigerator includes a refrigerator compartment 2, a freezer compartment 1, and a magnetic field preservation component as described above. The refrigerator compartment 2 is equipped with a storage drawer 21; the magnetic field preservation component includes a magnetic field generating device and a cooling circulation pipe 4. The magnetic field generating device is located inside the refrigerator compartment 2 and adjacent to the storage drawer 21, and is used to apply a magnetic field to the storage drawer 21; the cooling circulation pipe 4 is filled with a cold storage agent, which flows sequentially through the freezer compartment 1 and the magnetic field generating device, exchanging heat with both to cool the magnetic field generating device.

[0068] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0069] The magnetic field preservation component and refrigerator provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A magnetic field fresh-keeping assembly applied to a refrigerator, the refrigerator comprising a refrigerating chamber and a freezing chamber, a storage drawer being arranged in the refrigerating chamber, characterized in that, The magnetic field preservation assembly comprises: a magnetic field generating device arranged in the refrigeration chamber and adjacent to the storage drawer, the magnetic field generating device being configured to apply a magnetic field to the storage drawer; a cooling circulation pipeline filled with a cold storage agent, the cold storage agent sequentially flowing through the freezing chamber and the magnetic field generating device and exchanging heat with the freezing chamber and the magnetic field generating device respectively, so as to cool the magnetic field generating device.

2. The magnetic field fresh keeping assembly according to claim 1, characterized in that, The cooling circulation pipeline comprises: a cold storage chamber arranged in the freezing chamber; a heat exchange pipe penetrating the magnetic field generating device, at least one end of the heat exchange pipe being communicated with the cold storage chamber.

3. The magnetic field fresh keeping assembly according to claim 2, characterized in that, The cooling circulation pipeline further comprises a heat exchange chamber arranged in the refrigeration chamber and adjacent to the storage drawer; both ends of the heat exchange pipe are communicated with the cold storage chamber and the heat exchange chamber respectively.

4. The magnetic field fresh keeping assembly according to claim 3, characterized in that, The cooling circulation pipeline further comprises: a connecting pipe communicating the cold storage chamber and the heat exchange chamber; a circulating pump arranged on the connecting pipe, the circulating pump being configured to drive the cold storage agent to flow from the heat exchange chamber to the cold storage chamber.

5. The magnetic field fresh keeping assembly according to claim 4, characterized in that, Further comprising a temperature detection member arranged on the magnetic field generating device, the circulating pump being turned on when the detection result of the temperature detection member is greater than a preset temperature.

6. The magnetic field fresh keeping assembly of claim 2, wherein, The magnetic field generating device comprises a coil unit, the coil unit being annular, and the coil unit being provided with a perforation; the heat exchange pipe penetrates the perforation.

7. The magnetic field fresh keeping assembly according to claim 6, characterized in that, The coil unit is provided with a plurality of perforations at intervals, the cooling circulation pipeline correspondingly comprising a plurality of heat exchange pipes, each heat exchange pipe penetrating one perforation, and each heat exchange pipe being communicated with the cold storage chamber.

8. The magnetic field fresh keeping assembly according to claim 3, characterized in that, The heat exchange chamber is clamped between the magnetic field generating device and the storage drawer.

9. The magnetic field fresh keeping assembly of claim 2, wherein, The cold storage chamber is arranged on one side of the freezing chamber close to the magnetic field generating device.

10. A refrigerator characterized by comprising: It comprises: a refrigeration chamber, the refrigeration chamber being provided with a storage drawer; a freezing chamber; The magnetic field preservation assembly according to any one of claims 1-9, the magnetic field preservation assembly comprising: a magnetic field generating device arranged in the refrigeration chamber and adjacent to the storage drawer, the magnetic field generating device being configured to apply a magnetic field to the storage drawer; a cooling circulation pipeline filled with a cold storage agent, the cold storage agent sequentially flowing through the freezing chamber and the magnetic field generating device and exchanging heat with the freezing chamber and the magnetic field generating device respectively, so as to cool the magnetic field generating device.

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