Magnetic field freshness-preserving refrigerator

Abstract

A magnetic field freshness-preserving refrigerator (1), comprising: a refrigerator body (100), the refrigerator body (100) being internally provided with a magnetic field storage space (201) for storing food items; and at least one permanent magnet element (300), the permanent magnet element (300) being arranged adjacent to the magnetic field storage space (201) so as to generate a magnetic field covering the magnetic field storage space (201), and the permanent magnetic element (300) being configured such that an attenuation rate of a magnetic flux density within the magnetic field storage space (201) is greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter. On the one hand, this ensures a uniform magnetic flux density in the magnetic field storage space (201), while on the other hand, this helps reduce additionally configured magnetically conductive materials, thereby helping to lower costs while ensuring a better magnetic field freshness-preserving effect.

Description

Magnetic field preservation refrigerator

[0001] This application is based on and claims priority to Chinese Patent Application No. 202421763195.0, filed on July 24, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of low-temperature storage technology, and in particular to a magnetic field preservation refrigerator. Background Technology

[0003] Refrigerators, as a common household appliance, use low temperatures to store food, thereby extending its shelf life. While refrigerators extend the shelf life, the quality of food inevitably declines after low-temperature storage. However, ongoing research has revealed that magnetic fields have a beneficial effect on low-temperature food storage, not only further extending the shelf life but also helping to maintain freshness over a longer period. Therefore, the refrigerator industry is actively exploring the introduction of magnetic fields into refrigerators to achieve low-temperature storage under magnetic fields.

[0004] Any prior art mentioned in the specification does not imply confirmation or suggestion that such prior art constitutes part of the general common knowledge in any jurisdiction, or that it can be reasonably expected that such prior art will be understood, regarded as relevant and / or combined with other prior art by a person skilled in the art. Summary of the Invention

[0005] One objective of this application is to provide a magnetic field preservation refrigerator that can store food in a magnetic field while reducing costs.

[0006] Specifically, this application provides a magnetic field preservation refrigerator, comprising:

[0007] The box contains a magnetic storage space for storing food ingredients; and

[0008] At least one permanent magnet sheet is disposed against the magnetic field storage space to generate a magnetic field covering the magnetic field storage space, and the permanent magnet sheet is configured such that the attenuation rate of the magnetic induction intensity in the magnetic field storage space is greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter.

[0009] Optionally, the permanent magnet is configured such that the attenuation rate of the magnetic induction intensity within the magnetic field storage space is greater than or equal to 0.2 Gauss per centimeter and less than or equal to 0.6 Gauss per centimeter.

[0010] Optionally, the magnetic field preservation refrigerator includes two permanent magnet plates, which are respectively disposed on opposite sides of the magnetic field storage space, and the magnetic poles of the two permanent magnet plates are distributed in the same direction.

[0011] Optionally, the distance between the center point of the region between the two permanent magnet sheets and the corner point of the permanent magnet sheet is less than or equal to 45 cm, and the permanent magnet sheets are configured such that the magnetic induction intensity in the magnetic field storage space is 10-100 Gs.

[0012] Optionally, the magnetic field storage space is configured in the refrigerator compartment, and the thickness of the permanent magnet sheet is greater than or equal to 2 mm and less than or equal to 5 mm.

[0013] Optionally, the magnetic field storage space is configured in the freezer compartment of the refrigerator, and the thickness of the permanent magnet sheet is greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0014] Optionally, the magnetic field preservation refrigerator includes a uniform magnetic plate, which is attached to the permanent magnet sheet, and the uniform magnetic plate is disposed on the side of the corresponding permanent magnet sheet that is away from the magnetic field storage space.

[0015] Optionally, the thickness of the uniform magnetic plate is greater than or equal to 0.35 mm and less than or equal to 2 mm.

[0016] Optionally, the permanent magnet sheet is at least one of permanent magnet ferrite, rare earth permanent magnet sheet, composite permanent magnet sheet, or alloy permanent magnet sheet.

[0017] Optionally, the magnetic field preservation refrigerator includes a storage container that forms the magnetic field storage space.

[0018] The magnetic field preservation refrigerator of this application incorporates permanent magnet sheets within the refrigerator body. These sheets generate a magnetic field covering the storage space, and are configured such that the attenuation rate of the magnetic field strength within the storage space is greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter. This allows food stored in the magnetic field to be affected by the magnetic field during low-temperature storage, thereby improving the preservation effect of the food at low temperatures and helping it maintain better freshness for a longer period. The configuration of the permanent magnet sheets with an attenuation rate of greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter avoids excessive differences in magnetic field strength across different parts of the storage space, ensuring a relatively uniform magnetic field strength throughout the entire storage space and guaranteeing a consistent food preservation effect. On the other hand, pursuing excessively high uniformity requires additional configuration. A common approach is to use a box-shaped magnetic conductive component with openings at both ends to surround the permanent magnet sheet. Therefore, by ensuring that the attenuation rate of the magnetic induction intensity in the magnetic field storage space is greater than or equal to 0.05 Gauss per centimeter, it helps to reduce the amount of additional magnetic conductive material, thereby reducing costs while ensuring a good magnetic field preservation effect.

[0019] The above and other objects, advantages and features of this application will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this application in conjunction with the accompanying drawings.

[0020] The term “comprise” as used herein, and variations thereof such as “comprises”, “comprised”, “comprising”, “including”, and “containing”, do not exclude other features, components, elements, or steps unless the context clearly requires otherwise. Attached Figure Description

[0021] The following sections will describe some specific embodiments of this application in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0022] Figure 1 is a schematic diagram of a magnetic field preservation refrigerator according to an embodiment of the present application;

[0023] Figure 2 is a partial schematic diagram of a magnetic field preservation refrigerator according to an embodiment of the present application;

[0024] Figure 3 is a schematic diagram of a permanent magnet sheet and connector in a magnetic field preservation refrigerator according to an embodiment of the present application;

[0025] Figure 4 is a schematic diagram of a permanent magnet sheet and a uniform magnet plate in a magnetic field preservation refrigerator according to an embodiment of the present application. Detailed Implementation

[0026] Those skilled in the art should understand that the embodiments described below are merely a part of the embodiments of this application, and not all of the embodiments of this application. These partial embodiments are intended to explain the technical principles of this application and are not intended to limit the scope of protection of this application. Based on the embodiments provided in this application, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of this application.

[0027] 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", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] It should also be noted that, in the description of this application, 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 direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] As shown in Figures 1 and 2, in one embodiment, the refrigerator 1 includes a cabinet 100, a storage container 200, and two permanent magnet plates 300. The cabinet 100 contains a magnetic field storage space 201 for storing food. The permanent magnet plates 300 are disposed against the magnetic field storage space 201 to generate a magnetic field covering the magnetic field storage space 201, and the permanent magnet plates 300 are configured such that the attenuation rate of the magnetic induction intensity within the magnetic field storage space 201 is greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter.

[0030] Referring to Figures 1 and 2, specifically, the box 100 has multiple receiving compartments 101. The multiple receiving compartments 101 are distributed longitudinally. The storage container 200 forms a magnetic field storage space 201. Specifically, the storage container 200 is a drawer, that is, the space of the drawer serves as the magnetic field storage space 201.

[0031] Referring again to Figures 1 and 2, the permanent magnet sheet 300 has a square sheet structure. Two permanent magnet sheets 300 are respectively disposed on opposite sides of the magnetic field storage space 201, and the magnetic poles of the two permanent magnet sheets 300 are distributed in the same direction. The two permanent magnet sheets 300 are respectively disposed on the top and bottom sides of the magnetic field storage space 201, that is, on the top and bottom sides of the drawer, so that the magnetic field generated by the two permanent magnet sheets 300 covers the magnetic field storage space 201. The magnetic poles of the two permanent magnet sheets 300 are distributed in the same direction; that is, when the N pole of the upper permanent magnet sheet 300 is facing up and the S pole is facing down, the lower permanent magnet sheet 300 is also N pole facing up and the S pole is facing down; conversely, when the N pole of the lower permanent magnet sheet 300 is N pole facing down and the S pole is facing up, the lower permanent magnet sheet 300 is also N pole facing down and the S pole is facing up.

[0032] It should be noted that refrigerators typically have multiple compartments for different functions, such as a refrigerator compartment, a freezer compartment, a variable temperature compartment, etc. The specific number and function of the compartments can be configured according to pre-defined needs. The refrigerator in this embodiment is merely an example; those skilled in the art can configure the specific number, function, and layout of the compartments according to their needs. Furthermore, permanent magnets can be placed in any functional compartment, meaning the magnetic field storage space can be configured in any functional compartment.

[0033] Referring to Figures 1 and 2, the permanent magnet 300 is configured such that the attenuation rate of the magnetic induction intensity within the magnetic field storage space 201 is greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter. That is, for any two points 1 centimeter apart within the magnetic field storage space 201, the difference in magnetic induction intensity between the two points is greater than or equal to 0.05 Gauss and less than or equal to 1 Gauss. For example, the attenuation rate of the magnetic induction intensity within the magnetic field storage space 201 may be 0.05 Gauss per centimeter, 0.08 Gauss per centimeter, 0.1 Gauss per centimeter, 0.15 Gauss per centimeter, 0.2 Gauss per centimeter, 0.25 Gauss per centimeter, 0.3 Gauss per centimeter, 0.35 Gauss per centimeter, 0.4 Gauss per centimeter, 0.45 Gauss per centimeter, 0.5 Gauss per centimeter, 0.55 Gauss per centimeter, 0.6 Gauss per centimeter, 0.65 Gauss per centimeter, 0.7 Gauss per centimeter, 0.75 Gauss per centimeter, 0.8 Gauss per centimeter, 0.85 Gauss per centimeter, 0.9 Gauss per centimeter, 0.95 Gauss per centimeter, or 1 Gauss per centimeter.

[0034] Preferably, the permanent magnet 300 is configured such that the attenuation rate of the magnetic induction intensity within the magnetic field storage space 201 is greater than or equal to 0.2 Gauss per centimeter and less than or equal to 0.6 Gauss per centimeter. Exemplarily, the attenuation rate of the magnetic induction intensity within the magnetic field storage space 201 may be 0.2 Gauss per centimeter, 0.22 Gauss per centimeter, 0.28 Gauss per centimeter, 0.3 Gauss per centimeter, 0.34 Gauss per centimeter, 0.36 Gauss per centimeter, 0.4 Gauss per centimeter, 0.45 Gauss per centimeter, 0.47 Gauss per centimeter, 0.5 Gauss per centimeter, 0.53 Gauss per centimeter, 0.57 Gauss per centimeter, or 0.6 Gauss per centimeter.

[0035] In this embodiment, a permanent magnet 300 is installed inside the housing 100. The permanent magnet 300 generates a magnetic field covering the magnetic field storage space 201. The permanent magnet 300 is configured such that the attenuation rate of the magnetic induction intensity within the magnetic field storage space 201 is greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter. This allows the food stored in the magnetic field storage space 201 to be affected by the magnetic field during low-temperature storage, thereby improving the food's preservation effect at low temperatures and helping it maintain better freshness for a longer period. Specifically, during freezing, the magnetic field restricts the free path of water molecules, causing the hydrogen bonds in water molecule clusters to break. This inhibits the growth of crystal nuclei within the food, resulting in the formation of small ice crystals and reducing the damage to food cells caused by ice crystals. Therefore, it helps reduce juice loss after thawing, thereby reducing nutrient loss and ensuring the food's taste. During refrigeration, the magnetic field reduces the supercooling of the food; that is, under the application of a magnetic field, the food can remain in a non-frozen state at a lower temperature. In other words, it can lower the refrigeration temperature of food, thereby further reducing bacterial growth and helping to preserve the freshness of the food.

[0036] The permanent magnet sheet 300 is configured such that the attenuation rate of the magnetic induction intensity within the magnetic field storage space 201 is greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter. This serves two purposes: firstly, it prevents excessive differences in magnetic induction intensity across different parts of the magnetic field storage space 201, ensuring that the magnetic induction intensity is roughly uniform throughout the entire space, thus guaranteeing uniformity in food preservation. Secondly, achieving excessively high uniformity requires additional configuration, typically using a box-shaped magnetically conductive component with openings at both ends to enclose the permanent magnet sheet. Therefore, by ensuring that the attenuation rate of the magnetic induction intensity within the magnetic field storage space 201 is greater than or equal to 0.05 Gauss per centimeter, it helps reduce the need for additional magnetically conductive material, thereby reducing costs while maintaining good magnetic field preservation performance.

[0037] In one embodiment, the permanent magnet 300 is configured such that the attenuation rate of the magnetic induction intensity within the magnetic field storage space 201 is greater than or equal to 0.2 Gauss per centimeter and less than or equal to 0.6 Gauss per centimeter, which helps to further reduce the amount of magnetic conductive material that needs to be configured, thereby helping to further reduce costs.

[0038] Referring to Figures 1 and 2, in one embodiment, the distance between the center point of the region between the two permanent magnet sheets 300 and the corner point of the permanent magnet sheet 300 is less than or equal to 45 cm, and the permanent magnet sheet 300 is configured such that the magnetic induction intensity in the magnetic field storage space 201 is 10-100 Gauss.

[0039] In one embodiment, the center point of the region between the two permanent magnet sheets 300 is the midpoint of the line connecting the center points of the two permanent magnet sheets 300, and the corner point of the permanent magnet sheet 300 is the corner point of the surface of one permanent magnet sheet 300 facing the other permanent magnet sheet 300. The distance between the center point of the region between the two permanent magnet sheets 300 and the corner point of the permanent magnet sheet 300 is less than or equal to 45 cm, and the permanent magnet sheets 300 are configured such that the magnetic induction intensity within the magnetic field storage space 201 is 10-100 Gauss. For example, it can be 10 Gauss, 20 Gauss, 30 Gauss, 40 Gauss, 50 Gauss, 60 Gauss, 70 Gauss, 80 Gauss, 90 Gauss, or 100 Gauss, etc. Preferably, the permanent magnet sheets 300 are configured such that the magnetic induction intensity within the magnetic field storage space 201 is 15-85 Gauss.

[0040] In this way, by configuring the space between the permanent magnet sheets 300, that is, configuring the space size of the magnetic field storage space 201, the space size of the magnetic field storage space 201 is made more suitable, and the permanent magnet sheets 300 are configured such that the magnetic induction intensity in the magnetic field storage space 201 is 10-100 Gauss. Thus, the attenuation rate of the magnetic induction intensity in the magnetic field storage space 201 is greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter, so that the magnetic induction intensity at various points in the magnetic field storage space 201 achieves a good magnetic field preservation effect.

[0041] For example, the length and width of the permanent magnet sheet 300 are 400 mm and 300 mm respectively, and the distance between the two permanent magnet sheets 300 is 200 mm. Then the distance between the center point of the area between the two permanent magnet sheets 300 and the corner point of the permanent magnet sheet 300 is 269 mm, or 26.9 cm.

[0042] It is understandable that there is enough space between the two permanent magnet plates 300 to configure the magnetic field storage space 201, so the distance between the center point of the area between the two permanent magnet plates 300 and the corner point of the permanent magnet plate 300 is greater than or equal to 15 centimeters.

[0043] As shown in Figures 1 and 2, the uppermost compartment 101 of the refrigerator 1 is the refrigerator compartment, and two permanent magnet plates 300 are disposed in the uppermost compartment 101, which is the refrigerator compartment. Both the storage container 200 and the permanent magnet plates 300 are disposed in the refrigerator compartment; that is, the magnetic field storage space 201 is disposed in the refrigerator compartment. The thickness of the permanent magnet plates is greater than or equal to 2 mm and less than or equal to 5 mm. For example, it can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm. In the refrigerator compartment, by ensuring that the thickness of the permanent magnet plates is greater than or equal to 2 mm and less than or equal to 5 mm, the magnetic induction intensity at various points within the magnetic field storage space 201 meets the requirements, resulting in a magnetic induction intensity that optimizes the preservation effect under refrigeration.

[0044] It should be noted that in some other embodiments, the magnetic field storage space can also be configured in the freezer compartment. When the magnetic field storage space is configured in the freezer compartment of the refrigerator, the thickness of the permanent magnet sheet is greater than or equal to 0.5 mm and less than or equal to 3 mm. For example, it can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm. In the freezer compartment, by making the thickness of the permanent magnet sheet greater than or equal to 0.5 mm and less than or equal to 3 mm, it is possible to ensure that the attenuation rate of the magnetic induction intensity in the magnetic field storage space meets the requirements, and that the magnetic induction intensity at various points in the magnetic field storage space is a value that results in better preservation effect under freezing. Because the preferred magnetic induction intensity under freezing is lower than that under refrigeration, the thickness of the permanent magnet sheet can be relatively smaller.

[0045] Referring to Figures 1 to 3, in one embodiment, the refrigerator 1 includes two connectors 400, each with its two ends connected to two permanent magnet plates 300, and the two connectors 400 are located on opposite sides of the magnetic field storage space 201. Specifically, the two permanent magnet plates 300 are respectively disposed on the top and bottom sides of the magnetic field storage space 201, and the two connectors 400 are respectively disposed on the left and right sides of the magnetic field storage space 201. The top end of the connector 400 is connected to the upper permanent magnet plate 300, and the bottom end of the connector 400 is connected to the lower permanent magnet plate 300.

[0046] In one embodiment, the ratio of the width of the connector 400 to the length of the side edge of the adjacent permanent magnet sheet 300 is greater than or equal to 0.05 and less than or equal to 0.1. For example, for the connector 400 on the left side of the permanent magnet sheet 300, this ratio is the ratio of the dimension of the connector 400 in the direction extending from the left side of the permanent magnet sheet 300 to the length of the left side of the permanent magnet sheet 300. For example, the ratio of the width of the connector to the width of the side edge of the adjacent permanent magnet sheet can be 0.05, 0.06, 0.07, 0.08, 0.09, or 0.1. For instance, if the side edge length of the permanent magnet sheet 300 is 330 mm, the width of the connector 400 can be 16.5 mm, 19.8 mm, 23.1 mm, 26.4 mm, 29.7 mm, or 33 mm.

[0047] By setting the connector 400, it is beneficial to guide the magnetic field generated by the permanent magnet sheet 300, which helps to concentrate the magnetic field between the two permanent magnet sheets 300. This allows the attenuation rate of the magnetic induction intensity in the magnetic field storage space 201 to be within the required range and smaller. Moreover, compared with the method of completely enclosing the permanent magnet sheet, the cost of setting only the connector 400 is relatively low.

[0048] Referring to Figures 1, 2, and 4, in one embodiment, the refrigerator 1 includes two uniform magnetic plates 500, which are respectively attached to two permanent magnet sheets 300, and the uniform magnetic plates 500 are disposed on the side of the corresponding permanent magnet sheet 300 facing away from the magnetic field storage space 201. Specifically, the refrigerator 1 includes two uniform magnetic plates 500, which are respectively attached to two permanent magnet sheets 300. Specifically, the two permanent magnet sheets 300 are respectively disposed on the top and bottom sides of the magnetic field storage space 201, one uniform magnetic plate 500 is disposed above the permanent magnet sheet 300 on the top side of the magnetic field storage space 201, and the other uniform magnetic plate 500 is disposed below the permanent magnet sheet 300 on the bottom side of the magnetic field storage space 201.

[0049] By setting up the uniform magnetic plate 500, it is beneficial to guide the magnetic field generated by the permanent magnet sheet 300, which helps to concentrate the magnetic field between the two permanent magnet sheets 300. This allows the attenuation rate of the magnetic induction intensity in the magnetic field storage space 201 to be within the range of greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter. Moreover, compared with the method of completely enclosing the permanent magnet sheet, the cost of setting up only the uniform magnetic plate 500 is relatively low.

[0050] In some other embodiments, two uniform magnetic plates and two connectors can be provided simultaneously. The two uniform magnetic plates are respectively located on the side of the two permanent magnet sheets facing away from the magnetic field storage space, and the two ends of the connectors are respectively connected to the two uniform magnetic plates. Compared with only providing connectors or uniform magnetic plates, this method has a better concentration effect on the magnetic field, so a smaller size can be used. Therefore, while ensuring that the attenuation rate of the magnetic induction intensity in the magnetic field storage space 201 is within the range of greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter, the cost is also relatively lower than the method of completely enclosing the permanent magnet sheets.

[0051] In one embodiment, the thickness of the uniform magnetic plate 500 is greater than or equal to 0.35 mm and less than or equal to 2 mm. For example, it can be 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 1 mm, 1.5 mm, or 2 mm. This ensures that the attenuation rate of the magnetic induction intensity within the magnetic field storage space meets the requirements, while keeping the cost of the uniform magnetic plate from becoming too high.

[0052] Referring to Figures 1 and 2, in one embodiment, the permanent magnet sheet 300 is at least one of permanent magnet ferrite, rare earth permanent magnet, composite permanent magnet, or alloy permanent magnet. Specifically, the permanent magnet sheet 300 can be a single type of permanent magnet sheet or a polymeric permanent magnet sheet composed of multiple types of permanent magnet sheets.

[0053] In one embodiment, the permanent magnet sheet is a bonded permanent magnet ferrite sheet, and its residual magnetic induction intensity satisfies a value greater than or equal to 60 millitrile and less than or equal to 350 millitrile, preferably greater than or equal to 240 millitrile and less than or equal to 270 millitrile. Combined with the distance relationship between the two qualified permanent magnet sheets 300 configured as described above, the magnetic induction intensity within the magnetic field storage space 201 is within the range of 10-100 Gauss as mentioned above. This ensures that the attenuation rate of the magnetic induction intensity within the magnetic field storage space meets the requirements, and that the magnetic induction intensity value within the magnetic field storage space is good, providing a better preservation effect.

[0054] When the permanent magnet sheet is a bonded permanent magnet ferrite, the uniform magnet plate is made of pure iron or iron alloy material, and the thickness of the uniform magnet plate can be configured to be greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0055] Furthermore, the coercivity of the permanent magnet sheet is greater than or equal to 50 kA / m and less than or equal to 260 kA / m, preferably greater than or equal to 150 kA / m and less than or equal to 180 kA / m. The intrinsic coercivity of the permanent magnet sheet is greater than or equal to 50 kA / m and less than or equal to 350 kA / m, preferably greater than or equal to 190 kA / m and less than or equal to 240 kA / m. The maximum magnetic energy product of the permanent magnet sheet is greater than or equal to 0.8 kJ / m³ and less than or equal to 25 kJ / m³, preferably greater than or equal to 11 kJ / m³ and less than or equal to 14 kJ / m³. The above configuration helps the permanent magnet sheet maintain sufficient magnetic induction intensity during long-term use.

[0056] In one embodiment, and in another embodiment, the permanent magnet sheet is a sintered permanent magnet ferrite with a residual magnetic induction intensity of greater than or equal to 200 millitrile and less than or equal to 490 millitrile, preferably greater than or equal to 370 millitrile and less than or equal to 390 millitrile. Combined with the distance relationship between the two compliant permanent magnet sheets 300 configured as described above, the magnetic induction intensity within the magnetic field storage space 201 is within the aforementioned range of 10-100 Gauss. This ensures that the attenuation rate of the magnetic induction intensity within the magnetic field storage space meets the requirements, and that the magnetic induction intensity value within the magnetic field storage space is relatively good, providing a better preservation effect.

[0057] When the permanent magnet sheet is a sintered permanent magnet ferrite, the uniform magnet plate is made of silicon steel, and the thickness of the uniform magnet plate can be configured to be greater than or equal to 0.35 mm and less than or equal to 1 mm.

[0058] In one embodiment, the coercivity of the permanent magnet is greater than or equal to 120 kA / m and less than or equal to 360 kA / m, preferably greater than or equal to 260 kA / m and less than or equal to 290 kA / m. The intrinsic coercivity of the permanent magnet is greater than or equal to 200 kA / m and less than or equal to 450 kA / m, preferably greater than or equal to 310 kA / m and less than or equal to 330 kA / m. The maximum magnetic energy product of the permanent magnet is greater than or equal to 6.4 kJ / m³ and less than or equal to 45 kJ / m³, preferably greater than or equal to 25 kJ / m³ and less than or equal to 29 kJ / m³. The above configuration helps the permanent magnet maintain sufficient magnetic induction intensity during long-term use.

[0059] Because bonded permanent magnet ferrite has a stronger ability to radiate magnetic induction intensity outward compared to sintered permanent magnet ferrite, the residual magnetic induction intensity of bonded permanent magnet ferrite can be relatively smaller for the same size, so that the same range of magnetic induction intensity can be achieved within the magnetic field storage space.

[0060] It should be noted that in some other embodiments, only one permanent magnet sheet may be used. Under this condition, only one uniform magnet sheet needs to be used in conjunction with the permanent magnet sheet.

[0061] Additionally, it should be noted that in some other embodiments, storage containers may not be provided. Instead, partitions or permanent magnet sheets may be used to hold the stored food. In this case, the magnetic field storage space is defined as the space in which the attenuation rate of the magnetic induction intensity under the action of the magnetic field generated by the permanent magnet sheet is greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter. The range of the magnetic field storage space can be marked on the inner wall of the refrigerator body.

[0062] Therefore, those skilled in the art should recognize that although many exemplary embodiments of this application have been shown and described in detail herein, many other variations or modifications conforming to the principles of this application can be directly determined or derived from the disclosure of this application without departing from the spirit and scope of this application. Thus, the scope of this application should be understood and construed as covering all such other variations or modifications.

Claims

1. A magnetic field fresh-keeping refrigerator, characterized in that, include: The box contains a magnetic storage space for storing food ingredients. and At least one permanent magnet sheet is disposed against the magnetic field storage space to generate a magnetic field covering the magnetic field storage space, and the permanent magnet sheet is configured such that the attenuation rate of the magnetic induction intensity in the magnetic field storage space is greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter.

2. The magnetic field fresh keeping refrigerator according to claim 1, characterized in that, The permanent magnet is configured such that the attenuation rate of the magnetic induction intensity within the magnetic field storage space is greater than or equal to 0.2 Gauss per centimeter and less than or equal to 0.6 Gauss per centimeter.

3. The magnetic field fresh keeping refrigerator according to claim 1 or 2, characterized in that, The magnetic field preservation refrigerator includes two permanent magnet plates, which are respectively disposed on opposite sides of the magnetic field storage space, and the magnetic poles of the two permanent magnet plates are distributed in the same direction.

4. The magnetic field fresh keeping refrigerator according to claim 3, characterized in that, The distance between the center point of the region between the two permanent magnet sheets and the corner point of the permanent magnet sheet is less than or equal to 45 cm, and the permanent magnet sheets are configured such that the magnetic induction intensity in the magnetic field storage space is 10-100 Gauss.

5. The magnetic field fresh-keeping refrigerator according to claim 1, characterized in that, The magnetic field storage space is configured in the refrigerator compartment, and the thickness of the permanent magnet sheet is greater than or equal to 2 mm and less than or equal to 5 mm.

6. The magnetic field fresh-keeping refrigerator according to claim 1, characterized in that, The magnetic field storage space is configured in the freezer compartment of the refrigerator, and the thickness of the permanent magnet sheet is greater than or equal to 0.5 mm and less than or equal to 3 mm.

7. The magnetic field fresh-keeping refrigerator according to any one of claims 1 to 6, characterized in that, The magnetic field preservation refrigerator includes a uniform magnetic plate, which is attached to the permanent magnet sheet, and the uniform magnetic plate is located on the side of the corresponding permanent magnet sheet that is away from the magnetic field storage space.

8. The magnetic field fresh keeping refrigerator according to claim 7, characterized in that, The thickness of the uniform magnetic plate is greater than or equal to 0.35 mm and less than or equal to 2 mm.

9. The magnetic field fresh-keeping refrigerator according to claim 1, characterized in that, The permanent magnet sheet is at least one of permanent magnet ferrite, rare earth permanent magnet sheet, composite permanent magnet sheet, or alloy permanent magnet sheet.

10. The magnetic field fresh-keeping refrigerator according to claim 1, characterized in that, The magnetic field preservation refrigerator includes a storage container, which forms the magnetic field storage space.

11. The magnetic field fresh-keeping refrigerator according to claim 7, characterized in that, Two uniform magnetic plates are provided. The magnetic field preservation refrigerator also includes two connectors. The two uniform magnetic plates are respectively arranged on the side of the two permanent magnet sheets away from the magnetic field storage space. The two ends of each connector are respectively connected to the two uniform magnetic plates.

12. The magnetic field fresh-keeping refrigerator according to claim 3, characterized in that, It also includes two connectors, each of which is connected to two permanent magnet plates at both ends, and the two connectors are located on opposite sides of the magnetic field storage space.

13. The magnetic field fresh keeping refrigerator according to claim 12, characterized in that, The top ends of the two connectors are connected to the upper permanent magnet plate, and the bottom ends of the two connectors are connected to the lower permanent magnet plate; the ratio of the width of the connector to the length of the side of the connected permanent magnet plate is greater than or equal to 0.05 and less than or equal to 0.1.

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