Magnetic field fresh-keeping refrigerator

Abstract

The utility model provides a magnetic field fresh-keeping refrigerator, which comprises a refrigerator body, a magnetic field storage space, a magnetic field storage box and a magnetic field storage box, and is characterized in that the refrigerator body is internally provided with magnetic field storage space for storing food materials; the magnetic field storage space is used for storing a magnetic field, and the permanent magnet sheets are attached to the magnetic field storage space so as to generate a magnetic field covering the magnetic field storage space, and the permanent magnet sheets are configured to enable the attenuation rate of the magnetic induction intensity in the magnetic field storage space to be larger than or equal to 0.05 gauss per centimeter and smaller than or equal to 1 gauss per centimeter. The permanent magnet pieces can generate a magnetic field covering the magnetic field storage space, so that food materials stored in the magnetic field storage space can be subjected to the magnetic field effect in the low-temperature storage process, the magnetic induction intensity of all positions in the whole magnetic field storage space is roughly consistent, and therefore the fresh-keeping effect of the food materials at the low temperature is improved; the attenuation rate of the magnetic induction intensity in the magnetic field storage space is larger than or equal to 0.05 gauss per centimeter, so that additionally configured magnetic conductive materials can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of low-temperature storage, in particular to a magnetic field preservation refrigerator. Background Art

[0002] As a common household appliance, a refrigerator can store food materials at a low temperature, thereby extending the storage period of the food materials. Although the refrigerator extends the storage period of the food materials, the quality of the food materials after low-temperature storage will inevitably decline to some extent. With continuous research, it is found that the magnetic field has a good auxiliary effect on the low-temperature storage of food materials, which can not only further extend the preservation period of the food materials, but also help to maintain the freshness of the food materials during a longer storage time. Therefore, the refrigerator field is also actively exploring the introduction of the magnetic field into the refrigerator to achieve low-temperature storage under the magnetic field. Summary of the Utility Model

[0003] An object of the utility model is to provide a magnetic field preservation refrigerator that can store food materials under a magnetic field and reduce costs.

[0004] In particular, the utility model provides a magnetic field preservation refrigerator, comprising:

[0005] A box body, in which a magnetic field storage space for storing food materials is arranged; and

[0006] At least one permanent magnet piece, which is arranged close to the magnetic field storage space to generate a magnetic field covering the magnetic field storage space, and the permanent magnet piece 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.

[0007] Optionally, the permanent magnet piece is configured such that the attenuation rate of the magnetic induction intensity in the magnetic field storage space is greater than or equal to 0.2 gauss per centimeter and less than or equal to 0.6 gauss per centimeter.

[0008] Optionally, the magnetic field preservation refrigerator comprises two permanent magnet pieces, and the two permanent magnet pieces are respectively arranged on opposite sides of the magnetic field storage space, and the magnetic pole distribution directions of the two permanent magnet pieces are the same.

[0009] Optionally, the distance between the center point of the area between the two permanent magnet pieces and the corner point of the permanent magnet piece is less than or equal to 45 centimeters, and the permanent magnet piece is configured such that the magnetic induction intensity in the magnetic field storage space is 10-100 Gs.

[0010] Optionally, the magnetic field storage space is arranged in the refrigerating compartment of the refrigerator, and the thickness of the permanent magnet piece is greater than or equal to 2 millimeters and less than or equal to 5 millimeters.

[0011] Optionally, the magnetic field storage space is arranged 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.

[0012] Optionally, the magnetic field fresh-keeping refrigerator comprises a uniform magnetic plate, which is arranged in close contact with the permanent magnetic sheet, and the uniform magnetic plate is arranged on a side of the corresponding permanent magnetic sheet away from the magnetic field storage space.

[0013] Optionally, the thickness of the magnetic shim plate is greater than or equal to 0.35 mm and less than or equal to 2 mm.

[0014] Optionally, the permanent magnet sheet is at least one of a permanent ferrite, a rare earth permanent magnet sheet, a composite permanent magnet sheet or an alloy permanent magnet sheet.

[0015] Optionally, the magnetic field fresh-keeping refrigerator includes a storage container, and the storage container forms the magnetic field storage space.

[0016] The magnetic field fresh-keeping refrigerator of the utility model is provided with a permanent magnetic sheet in the box body, the permanent magnetic sheet can generate a magnetic field covering the magnetic field storage space, and the permanent magnetic sheet is configured so 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, so that the food stored in the magnetic field storage space can be affected by the magnetic field during the low-temperature storage process, thereby improving the fresh-keeping effect of the food at low temperatures, that is, it helps to keep the food fresh for a longer period of time. The permanent magnetic sheet is configured so 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, on the one hand, to avoid too large a difference in the magnetic induction intensity of each part of the magnetic field storage space, that is, to make the magnetic induction intensity of each part of the entire magnetic field storage space roughly consistent, so as to ensure the uniformity of the food preservation effect. On the other hand, if too high uniformity is pursued, additional configuration is required. A common practice is to use a box-shaped magnetic conductive component with openings at both ends to surround the permanent magnet sheet. Therefore, by making the attenuation rate of the magnetic induction intensity in the magnetic field storage space greater than or equal to 0.05 Gauss per centimeter, it helps to reduce the additional configuration of magnetic conductive materials, thereby helping to reduce costs while ensuring a better magnetic field preservation effect.

[0017] Based on the detailed description of the specific embodiments of the present invention in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other purposes, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0019] Figure 1 is a schematic diagram of a magnetic field preservation refrigerator according to an embodiment of the present utility model;

[0020] Figure 2 is a partial schematic diagram of a magnetic field preservation refrigerator according to an embodiment of the present utility model;

[0021] Figure 3 is a schematic diagram of a permanent magnet sheet and a connecting member in a magnetic field preservation refrigerator according to an embodiment of the present utility model;

[0022] Figure 4 is a schematic diagram of a permanent magnet sheet and a magnetic field homogenizing plate in a magnetic field preservation refrigerator according to an embodiment of the present utility model. Detailed implementation manners

[0023] Those skilled in the art should understand that the embodiments described below are only a part of the embodiments of the present utility model, rather than all the embodiments of the present utility model. This part of the embodiments is intended to explain the technical principle of the present utility model, rather than to limit the protection scope of the present utility model. Based on the embodiments provided by the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts should still fall within the protection scope of the present utility model.

[0024] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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 drawings. It is only for the convenience of describing the present utility model 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 of the present utility model.

[0025] Furthermore, it should be noted that in the description of the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can also be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0026] Such as Figure 1 and Figure 2As shown, in one embodiment, the refrigerator 1 includes a cabinet 100, a storage container 200, and two permanent magnet sheets 300. A magnetic field storage space 201 for storing food materials is arranged inside the cabinet 100. The permanent magnet sheets 300 are arranged against the magnetic field storage space 201 to generate a magnetic field covering the magnetic field storage space 201, and the permanent magnet sheets 300 are configured such that 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.

[0027] Referring to Figure 1 and Figure 2 As shown, specifically, the cabinet 100 is formed with a plurality of accommodation compartments 101. The plurality of accommodation compartments 101 are distributed longitudinally. The storage container 200 forms the 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.

[0028] Continuing to refer to Figure 1 and Figure 2 As shown, the permanent magnet sheets 300 are square sheet-like structures. The two permanent magnet sheets 300 are respectively arranged on opposite sides of the magnetic field storage space 201, and the magnetic pole distribution directions of the two permanent magnet sheets 300 are the same. The two permanent magnet sheets 300 are respectively arranged on the top side and the bottom side of the magnetic field storage space 201, that is, respectively arranged on the top side and the bottom side of the drawer, so that the magnetic fields generated by the two permanent magnet sheets 300 cover the magnetic field storage space 201. The magnetic pole distribution directions of the two permanent magnet sheets 300 are the same, that is, when the upper permanent magnet sheet 300 has its N pole facing up and S pole facing down, the lower permanent magnet sheet 300 also has its N pole facing up and S pole facing down; when the lower permanent magnet sheet 300 has its N pole facing down and S pole facing up, the lower permanent magnet sheet 300 also has its N pole facing down and S pole facing up.

[0029] It should be noted that the accommodation compartments of the refrigerator are usually multiple and are used to achieve different functions, such as a refrigerating compartment, a freezing compartment, a variable-temperature compartment, and so on. The specific number and functions of the accommodation compartments can be configured according to prior requirements. The refrigerator in this embodiment is only an example, and those skilled in the art can configure the specific number, functions, and layout modes of the accommodation compartments according to requirements. In addition, the permanent magnet sheets can be arranged in any accommodation compartment with any function, that is, the magnetic field storage space can be configured in any accommodation compartment with any function.

[0030] Referring to Figure 1 and Figure 2As shown, 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. That is to say, for any two points within the magnetic field storage space 201 with a distance of 1 centimeter between them, 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. Exemplarily, the attenuation rate of the magnetic induction intensity within the magnetic field storage space 201 can be allowed to 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.

[0031] Preferably, 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 0.2 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 can be allowed to 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.

[0032] In the solution of this embodiment, by arranging permanent magnet sheets 300 inside the box body 100, the permanent magnet sheets 300 can generate a magnetic field covering the magnetic field storage space 201, and the permanent magnet sheets 300 are configured such that 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. Thus, the food materials stored in the magnetic field storage space 201 can be affected by the magnetic field during the low-temperature storage process, thereby improving the freshness preservation effect of the food materials at low temperature, that is, helping to keep the food materials in a better freshness state for a longer time. Specifically, during the freezing process, the magnetic field can limit the free path of water molecules, break the hydrogen bonds in the water molecule clusters, thereby inhibiting the growth of crystal nuclei inside the food materials, generating small ice crystals inside the food materials, and further reducing the damage caused by the ice crystals to the food cells. Therefore, it helps to reduce the juice loss after the food materials are thawed, thereby reducing the nutrient loss of the food materials and ensuring the taste of the food materials. During the refrigeration process, the magnetic field can reduce the supercooling degree of the food materials, that is, in the case of applying the magnetic field, the food materials can remain in a non-frozen state at a lower temperature. In other words, it can reduce the refrigeration temperature of the food materials, thereby further reducing the growth of bacteria and helping to preserve the food materials.

[0033] The permanent magnet sheets 300 are configured such that 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. On the one hand, it is to avoid too large a difference in the magnetic induction intensity in each part of the magnetic field storage space 201, that is, to make the magnetic induction intensity everywhere in the entire magnetic field storage space 201 generally consistent to ensure the uniformity of the freshness preservation effect of the food materials. On the other hand, because if too high a uniformity is pursued, additional configurations are required. Commonly, a box-shaped magnetic conduction member with both ends open is used to surround the permanent magnet sheets. Therefore, by making the attenuation rate of the magnetic induction intensity in the magnetic field storage space 201 greater than or equal to 0.05 gauss per centimeter, it helps to reduce the additional magnetic conduction materials configured, thereby being beneficial to reducing the cost on the basis of ensuring a good magnetic field freshness preservation effect.

[0034] Furthermore, the permanent magnet sheets 300 are configured such that the attenuation rate of the magnetic induction intensity in 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 additional magnetic conduction materials required, thereby being beneficial to further reducing the cost.

[0035] Refer to Figure 1 to Figure 2 As shown, furthermore, 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 centimeters, 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.

[0036] Specifically, 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 sheet 300 is configured such that the magnetic induction intensity in 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 sheet 300 is configured such that the magnetic induction intensity in the magnetic field storage space 201 is 15 - 85 Gauss.

[0037] In this way, by configuring the space size 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 sheet 300 is configured such that the magnetic induction intensity in the magnetic field storage space 201 is 10 - 100 Gauss. Thus, when 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, a better magnetic field preservation effect is achieved for the magnetic induction intensity at various positions in the magnetic field storage space 201.

[0038] Exemplarily, 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 region between the two permanent magnet sheets 300 and the corner point of the permanent magnet sheet 300 is 269 mm, that is, 26.9 cm.

[0039] It can be understood that there is enough space between the two permanent magnet sheets 300 to configure the magnetic field storage space 201, so 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 greater than or equal to 15 cm.

[0040] Such as Figure 1 and Figure 2As shown, the uppermost accommodation compartment 101 of the refrigerator 1 is a refrigerating compartment, and two permanent magnetic sheets 300 are arranged in the uppermost accommodation compartment 101, that is, in the refrigerating compartment. The storage container 200 and the permanent magnetic sheets 300 are both arranged in the refrigerating compartment, that is, the magnetic field storage space 201 is configured in the refrigerating compartment, and the thickness of the permanent magnetic sheet 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 refrigerating compartment, by making the thickness of the permanent magnetic sheet greater than or equal to 2 mm and less than or equal to 5 mm, it is possible to ensure that the attenuation rate of the magnetic induction intensity in the magnetic field storage space 201 meets the requirements, and the magnetic induction intensity at each place in the magnetic field storage space 201 is a value that makes the fresh-keeping effect better under refrigeration.

[0041] It should be noted that in some other embodiments, the magnetic field storage space can also be configured in the freezing compartment. When the magnetic field storage space is configured in the freezing compartment of the refrigerator, the thickness of the permanent magnetic 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 freezing compartment, by making the thickness of the permanent magnetic 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 the magnetic induction intensity at each place in the magnetic field storage space is a value that makes the fresh-keeping effect better under freezing. Since the preferably magnetic induction intensity under freezing is lower than that under refrigeration, the thickness of the permanent magnetic sheet can be relatively small.

[0042] Refer to Figure 1 to Figure 3 As shown, in one embodiment, the refrigerator 1 includes two connecting members 400. The two ends of the connecting member 400 are respectively connected to the two permanent magnetic sheets 300, and the two connecting members 400 are respectively located on opposite sides of the magnetic field storage space 201. Specifically, the two permanent magnetic sheets 300 are respectively arranged on the top and bottom sides of the magnetic field storage space 201, and the two connecting members 400 are respectively arranged on the left and right sides of the magnetic field storage space 201. The top end of the connecting member 400 is connected to the upper permanent magnetic sheet 300, and the bottom end of the connecting member 400 is connected to the lower permanent magnetic sheet 300.

[0043] Furthermore, the ratio of the width of the connecting member 400 to the length of the side of the adjacent permanent magnet sheet 300 is greater than or equal to 0.05 and less than or equal to 0.1. Exemplarily, for the connecting member 400 on the left side of the permanent magnet sheet 300, that is, the ratio of the dimension of the connecting member 400 in the extending direction of the left side of the permanent magnet sheet 300 to the length of the left side of the permanent magnet sheet 300. Exemplarily, the ratio of the width of the connecting member to the width of the side of the adjacent permanent magnet sheet can be 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1. For example, if the length of the side of the permanent magnet sheet 300 is 330 mm, the width of the connecting member 400 can be 16.5 mm, 19.8 mm, 23.1 mm, 26.4 mm, 29.7 mm or 33 mm.

[0044] By providing the connecting member 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, so that the attenuation rate of the magnetic induction intensity in the magnetic field storage space 201 can be within a required range and smaller. And compared with the way of completely wrapping the permanent magnet sheet, the cost of only providing the connecting member 400 is relatively low.

[0045] Referring to Figure 1 、 Figure 2 and Figure 4 As shown, in one embodiment, the refrigerator 1 includes two magnetic field homogenizing plates 500, and the two magnetic field homogenizing plates 500 are respectively attached to the two permanent magnet sheets 300, and the magnetic field homogenizing plates 500 are arranged 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 magnetic field homogenizing plates 500, and the two magnetic field homogenizing plates 500 are respectively attached to the two permanent magnet sheets 300. Specifically, the two permanent magnet sheets 300 are respectively arranged on the top and bottom sides of the magnetic field storage space 201, one magnetic field homogenizing plate 500 is arranged above the permanent magnet sheet 300 on the top side of the magnetic field storage space 201, and the other magnetic field homogenizing plate 500 is arranged below the permanent magnet sheet 300 on the bottom side of the magnetic field storage space 201.

[0046] By providing the magnetic field homogenizing plates 500, it is beneficial to guide the magnetic field generated by the permanent magnet sheets 300, which helps to concentrate the magnetic field between the two permanent magnet sheets 300, so that the attenuation rate of the magnetic induction intensity in the magnetic field storage space 201 can be within a range of greater than or equal to 0.05 Gauss per centimeter and less than or equal to 1 Gauss per centimeter, and compared with the way of completely wrapping the permanent magnet sheet, the cost of only providing the magnetic field homogenizing plates 500 is relatively low.

[0047] In some other embodiments, two shimming plates and two connecting pieces may be provided at the same time, and the two shimming plates are provided on the sides of the two permanent magnet sheets away from the magnetic field storage space, and the two ends of the connecting piece are connected to the two shimming plates. Compared with only providing connecting pieces or shimming plates, this method has a better effect on concentrating the magnetic field, so a smaller size can be used. Therefore, on the basis of making the attenuation rate of the magnetic induction intensity in the magnetic field storage space 201 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 relatively low compared with the method of completely wrapping the permanent magnet sheets.

[0048] Furthermore, the thickness of the shim 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. The cost of the shim plate can be kept low while ensuring that the attenuation rate of the magnetic induction intensity in the magnetic field storage space meets the requirements.

[0049] Reference Figure 1 and Figure 2 As shown, further, the permanent magnet sheet 300 is at least one of permanent ferrite, rare earth permanent magnet sheet, composite permanent magnet sheet or alloy permanent magnet sheet. Specifically, the permanent magnet sheet 300 can be a single type of permanent magnet sheet, or a polymer permanent magnet sheet composed of multiple types of permanent magnet sheets.

[0050] In one embodiment, the permanent magnet sheet is a permanent magnet ferrite and a bonded permanent magnet ferrite, and its residual magnetic induction intensity satisfies greater than or equal to 60 millites and less than or equal to 350 millites, preferably, greater than or equal to 240 millites and less than or equal to 270 millites. Combined with the distance relationship between the two permanent magnet sheets 300 that meet the requirements configured in the foregoing, the magnetic induction intensity in the magnetic field storage space 201 is within the range of 10-100 gauss mentioned in the foregoing, so that the attenuation rate of the magnetic induction intensity in the magnetic field storage space meets the requirements, and the magnetic induction intensity value in the magnetic field storage space is good, providing a better preservation effect.

[0051] When the permanent magnet sheet is a bonded permanent magnet ferrite, the shim plate is made of pure iron or iron alloy material, and the thickness of the shim plate can be configured to be greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0052] In addition, 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 to maintain sufficient magnetic induction intensity during the long-term use of the permanent magnet sheet.

[0053] Further, in another embodiment, the permanent magnet sheet is a permanent ferrite and a sintered permanent ferrite, and its residual magnetic induction intensity satisfies being greater than or equal to 200 mT and less than or equal to 490 mT, preferably greater than or equal to 370 mT and less than or equal to 390 mT. Combining with the distance relationship of the two permanent magnet sheets 300 configured to meet the requirements in the previous text, the magnetic induction intensity in the magnetic field storage space 201 is within the range of 10 - 100 Gauss described above, so that the attenuation rate of the magnetic induction intensity in the magnetic field storage space meets the requirements, and the value of the magnetic induction intensity in the magnetic field storage space is good, providing a good fresh-keeping effect.

[0054] When the permanent magnet sheet is a sintered permanent ferrite, the uniform magnetic plate is made of silicon steel material, and the thickness of the uniform magnetic plate can be configured to be greater than or equal to 0.35 mm and less than or equal to 1 mm.

[0055] Further, the coercivity of the permanent magnet sheet 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 sheet 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 sheet 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 to maintain sufficient magnetic induction intensity during the long-term use of the permanent magnet sheet.

[0056] Since the bonded permanent ferrite has a stronger ability to emit magnetic induction intensity outward than the sintered permanent ferrite, under the same size, the residual magnetic induction intensity of the bonded permanent magnet ferrite can be relatively smaller, and the magnetic induction intensity within the same intensity range can be achieved in the magnetic field storage space.

[0057] It should be noted that in some other embodiments, only one permanent magnet sheet can also be provided. Under this condition, only one uniform magnetic sheet needs to be provided to cooperate with the permanent magnet sheet.

[0058] In addition, it should be noted that in some other embodiments, instead of providing a storage container, a partition or directly a permanent magnet sheet can be used to hold the stored food ingredients. Then, the space where the attenuation rate of the magnetic induction intensity under the magnetic field generated by the permanent magnet sheet is in the range of greater than or equal to 0.05 gauss per centimeter and less than or equal to 1 gauss per centimeter, that is, the magnetic field storage space, can be marked with scales on the inner wall of the refrigerator cabinet to mark the range of the magnetic field storage space.

[0059] At this point, those skilled in the art should recognize that although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and determined to cover all these other variations or modifications.

Claims

1. A magnetic field fresh-keeping refrigerator, characterized in that: include: A box body, wherein a magnetic field storage space for storing food is arranged inside the box body; and At least one permanent magnet sheet is disposed adjacent to 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 an attenuation rate of 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 sheet is configured so that the attenuation rate of the magnetic induction intensity in 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 fresh-keeping refrigerator comprises two permanent magnet sheets, which are respectively arranged on opposite sides of the magnetic field storage space, and the magnetic pole distribution directions of the two permanent magnet sheets are the same.

4. The magnetic field fresh-keeping refrigerator according to claim 3, characterized in that: The distance between the center point of the area 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 so 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 arranged in the refrigerating compartment of the refrigerator, 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 arranged 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 claim 1, characterized in that: The magnetic field fresh-keeping refrigerator comprises a uniform magnetic plate, which is arranged in contact with the permanent magnetic sheet and is arranged on a side of the corresponding permanent magnetic sheet 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 magnetic shim 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 a permanent ferrite, a rare earth permanent magnet sheet, a composite permanent magnet sheet or an alloy permanent magnet sheet.

10. The magnetic field fresh-keeping refrigerator according to claim 1, characterized in that: The magnetic field fresh-keeping refrigerator comprises a storage container, and the storage container forms the magnetic field storage space.

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