Pot container and electromagnetic cooking utensil

Abstract

The invention discloses a pot container and an electromagnetic cooking utensil, the pot container comprises a low-permeability nonmetal base body and at least one local high-permeability magnet, and the low-permeability nonmetal base body forms a pot body with an accommodating cavity; the local high magnetizers are arranged on the low-permeability nonmetal base body, and every two adjacent local high magnetizers or the adjacent part of a single local high magnetizer are arranged in a spaced mode in at least one of the radial direction, the circumferential direction and the height direction of the pot body. A distance D is formed between two adjacent local high magnetizers or between adjacent parts of a single local high magnetizer, the maximum temperature difference delta T exists in the local temperature difference area, and the distance D is related to at least one of the heat conductivity coefficient lambda, the maximum temperature difference delta T, the heat flow density q and the thickness d. When cooking is conducted, an obvious temperature gradient can be generated in the local temperature difference area, heat convection in the pot becomes fast and violent through the temperature gradient, liquid and food materials in the pot are boiled and turned over more sufficiently, the food materials are heated more evenly, and cooked food is better in taste.

Description

Technical Field

[0001] The present application relates to the technical field of kitchen appliances, and in particular to a pot and an electromagnetic cooking utensil. Background Art

[0002] Existing electromagnetic cooking appliances such as IH rice cookers and induction cookers are generally equipped with a pot that can be electromagnetically heated. Some pot base materials are made of non-metallic materials, which usually have no magnetic conductivity or low magnetic conductivity, so a magnetically sensitive material is evenly coated on the outer surface of the pot base material.

[0003] When the inner pot is electromagnetically heated, the entire inner pot will sense and generate heat, causing the heat to only rise from the bottom to the top, resulting in insufficient boiling and tumbling of the ingredients.

[0004] Therefore, a pot and an electromagnetic cooking device are needed to at least partially solve the above problems. Summary of the invention

[0005] The content of the invention introduces a series of simplified concepts, which will be further described in detail in the detailed description. The content of the invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, the present application provides a pot inner shell for an electromagnetic cooking device, the pot inner shell comprising:

[0007] A low-magnetic-permeability non-metallic matrix, wherein the low-magnetic-permeability non-metallic matrix forms a pot body having a receiving cavity; and

[0008] At least one local high-permeability magnetic body, the local high-permeability magnetic body is arranged on the outer surface of the low-permeability non-metallic matrix, and two adjacent local high-permeability magnetic bodies or adjacent parts of a single local high-permeability magnetic body are arranged at intervals in at least one of the radial direction, circumferential direction and height direction of the pot body to form a local temperature difference area on the inner surface of the pot body,

[0009] Among them, the thermal conductivity of the low magnetic permeability non-metallic matrix is ​​λ, the heat flux density of the low magnetic permeability non-metallic matrix is ​​q and its thickness is d, there is a spacing D between two adjacent local high magnetic permeabilities or between adjacent parts of a single local high magnetic permeability itself, and there is a maximum temperature difference ΔT in the local temperature difference area, and the spacing D is related to at least one of the thermal conductivity λ, the maximum temperature difference ΔT, the heat flux density q and the thickness d.

[0010] According to this solution, the inner pot can have a high-sensitivity magnetic area corresponding to the local high-permeability magnetic body and a low-sensitivity magnetic area corresponding to the interval between the local high-permeability magnetic bodies. Two adjacent high-sensitivity magnetic areas or adjacent parts of a single high-sensitivity magnetic area are separated by a low-sensitivity magnetic area, and the heat-generating area of ​​the non-metallic inner pot is reduced. When the cooking utensil is working, the local high-permeability magnetic body generates heat, and the temperature of the inner surface of the inner pot in the high-sensitivity magnetic area is higher, and the temperature of the inner surface of the inner pot in the low-sensitivity magnetic area is lower, thereby forming a local temperature difference area between the two areas, which can produce a significant temperature gradient. The temperature gradient is used to make the heat convection in the pot faster and more intense, so that the liquid and ingredients in the pot boil and roll more fully, the ingredients are heated more evenly, and the cooked food tastes better.

[0011] By setting the distance D reasonably, a temperature gradient within the desired range can be obtained, and the thermal convection effect between the liquid and ingredients in the pot is good, which can meet cooking needs.

[0012] Optionally, the maximum temperature difference ΔT in the local temperature difference area is a°C to b°C, and the spacing D is related to the thermal conductivity λ, the maximum temperature difference ΔT, the heat flux density q and the thickness d, and satisfies the following relationship:

[0013]

[0014] According to this solution, when the thermal conductivity λ of the low magnetic permeability non-metallic substrate used is large, a larger spacing D needs to be set to ensure that the maximum temperature difference ΔT is within the expected range of a℃ to b℃; for a pot with a larger thickness, a larger spacing D also needs to be set to ensure that the maximum temperature difference ΔT is within the expected range of a℃ to b℃; for a pot with a larger rated power, a smaller spacing D needs to be set to ensure that the maximum temperature difference ΔT is within the expected range of a℃ to b℃.

[0015] Optionally, the maximum temperature difference ΔT is 15° C. to 30° C., the thermal conductivity λ is 0.1w / (m·k) to 10w / (m·k), the thickness d is 3mm to 10mm, and the spacing D is 6mm to 80mm.

[0016] According to this solution, the non-metallic pot inner shell can obtain the desired temperature gradient of 15°C to 30°C, and the thermal convection effect of the liquid and food in the pot is good, which can meet cooking needs.

[0017] Optionally, the inner pot has a function setting area for arranging the local high magnetic permeability, and the area of ​​the local high magnetic permeability in the function setting area accounts for 50% to 90%.

[0018] According to this solution, the area ratio of the local high magnetic permeability is reasonably set so that the heat generated by the local high magnetic permeability can meet the cooking needs and the heating power reaches the expected level.

[0019] Optionally, the function setting area is defined based on the projection area of ​​the electromagnetic coil of the electromagnetic cooking utensil on the pot. Thus, the magnetic field generated by the electromagnetic coil completely covers the area with local high magnetic permeability, so that heat convection is generated within the range covered by the magnetic field, and the electromagnetic heating efficiency is high.

[0020] And / or, the inner pot has a height H, and the function setting area is located in an area below 2 / 3H of the inner pot.

[0021] According to this solution, the local temperature difference area formed on the inner surface of the pot is present below the normal height of the liquid and food in the pot, which can more effectively promote thermal convection between the liquid and food.

[0022] Optionally, the relative magnetic permeability μ of the low magnetic permeability non-metallic substrate is r1 Less than the preset relative permeability threshold μ r It is preset that the relative magnetic permeability μ of the local high-permeability magnetic body is r2 Greater than or equal to the preset relative permeability threshold μ r Preset, where 10≤μ r预设 ≤100; and / or

[0023] The difference Δμ between the relative magnetic permeability of the low-permeability non-metallic matrix and the relative magnetic permeability of the local high-permeability magnetic body r Δμr≥100.

[0024] According to this solution, the temperature gradient in the local temperature difference area can be made more obvious, which can achieve a better heat convection effect.

[0025] Optionally, the local high permeability magnetic body includes a first local high permeability magnetic body and a second local high permeability magnetic body, and the first local high permeability magnetic body and the second local high permeability magnetic body are arranged at intervals in at least one of the radial, circumferential and height directions of the pot, wherein the relative magnetic permeabilities of the first local high permeability magnetic body and the second local high permeability magnetic body are different.

[0026] According to this solution, different high magnetic permeability materials can be selected to form local high magnetic permeability bodies on the inner part of the pot. Different local high magnetic permeabilities generate different amounts of heat, which can increase the temperature difference and further promote faster and more intense heat convection in the pot, making the liquid and ingredients in the pot boil and tumble more fully, thereby increasing the degree of design freedom.

[0027] Optionally, the pot inner body also includes a first local high magnetic permeability and a local auxiliary magnetic permeability, and the local auxiliary magnetic permeability is located between two adjacent first local high magnetic permeabilities or between adjacent parts of a single first local high magnetic permeability, wherein the relative magnetic permeabilities of the local auxiliary magnetic permeability and the first local high magnetic permeability are different.

[0028] According to this solution, the local auxiliary magnetic conductor can also generate heat through magnetism, and assist in heating the inner pot, so that the temperature of the inner pot will not be too low in the low magnetic sensitivity area, thereby increasing the overall heating temperature of the inner pot.

[0029] Optionally, the local high magnetic permeability is attached to the outer surface of the low magnetic permeability non-metallic substrate; thereby, the pot body formed by the low magnetic permeability non-metallic substrate can have a uniform thickness, which facilitates the production of the pot body.

[0030] Alternatively, the local high magnetic permeability is embedded into the low magnetic permeability non-metallic matrix from the outer surface of the low magnetic permeability non-metallic matrix. Thus, the thickness of the inner pot can be set smaller without being affected by the thickness of the local high magnetic permeability, and the stability of the combination of the local high magnetic permeability and the pot body is better, and the structure of the inner pot is firm and stable.

[0031] Optionally, the low magnetic permeability non-metallic matrix is ​​made of a low magnetic permeability non-metallic material, and the low magnetic permeability non-metallic material includes at least one of ceramic, glass, and carbon; and / or the local high magnetic permeability body is made of a high magnetic permeability metal material or a high magnetic permeability non-metallic material, and the high magnetic permeability metal material includes at least one of magnetic stainless steel, magnetic magnet, magnetic magnet film, magnetic silver film, and magnetic aluminum film, and the high magnetic permeability non-metallic material includes graphite.

[0032] According to this solution, common high magnetic permeability metal materials and high magnetic permeability non-metallic materials can be selected to make the inner pot, and the material cost is low.

[0033] Optionally, the local high permeability magnetic bodies are arranged in an array, a ring or a spiral.

[0034] According to this solution, by arranging local high-permeability magnetic bodies in an array, ring or spiral shape, neatly arranged local temperature difference areas can be formed, which is conducive to better controlling the thermal convection heating of the liquid and food in the pot, the thermal convection effect is better, and the food at various positions in the pot is heated more evenly.

[0035] Optionally, the inner pot further includes at least one auxiliary functional layer, and the auxiliary functional layer is arranged on the outer surface and / or inner surface of the pot body with the local high magnetic permeability.

[0036] According to this solution, the inner pot can have more functions such as non-stick function, anti-scratch function, etc.

[0037] According to another aspect of the present application, an electromagnetic cooking appliance is provided, comprising an electromagnetic heating device and the inner pot according to any one of the above aspects, wherein the electromagnetic heating device is used for electromagnetically heating the inner pot.

[0038] According to this solution, a local temperature difference area can be formed on the inner surface of the pot by using a pot with local high magnetic conductivity. When cooking, a significant temperature gradient can be generated in the local temperature difference area. The temperature gradient is used to make the heat convection in the pot faster and more intense, so that the liquid and ingredients in the pot boil and roll more fully, the ingredients are heated more evenly, and the cooked food tastes better.

[0039] Optionally, the electromagnetic heating device includes a bottom electromagnetic heating device located at the bottom of the pot and / or a side electromagnetic heating device located at the side of the pot, and the local high magnetic permeability of the pot is arranged within the projection area of ​​the bottom electromagnetic heating device and / or the side electromagnetic heating device on the pot.

[0040] According to this solution, the magnetic field generated by the electromagnetic coil completely covers the area with local high magnetic permeability, so that heat convection is generated within the range covered by the magnetic field, and the electromagnetic heating efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The following drawings of the present application are used as a part of the present application for understanding the present application. The drawings show the implementation modes of the present application and the description thereof, and are used to explain the principle of the present application.

[0042] In the attached figure:

[0043] Figure 1 A partial cross-sectional view of a pot according to an embodiment of the present application;

[0044] Figure 2 is a partial cross-sectional view of a pot according to another embodiment of the present application;

[0045] Figure 3 is a partial cross-sectional view of a pot according to another embodiment of the present application;

[0046] Figure 4 is a partial cross-sectional view of a pot according to another embodiment of the present application;

[0047] Figure 5 is a partial cross-sectional view of a pot according to another embodiment of the present application;

[0048] Figure 6 is a partial cross-sectional view of a pot according to another embodiment of the present application;

[0049] Fig. 7A for Figure 1 A three-dimensional view of the pot shown in FIG.

[0050] Figure 7B for Figure 1 The schematic diagram of the position of the pot and the heating coil shown in FIG.

[0051] Figure 8for Figure 1 A partial schematic diagram of a pot shown in , wherein a layout shape of a local high-permeability magnetic body is shown;

[0052] Fig. 9 for Figure 1 Another partial schematic diagram of the pot shown in , wherein another arrangement shape of the local high permeability magnetic body is shown;

[0053] Fig.10 for Figure 1 Another partial schematic diagram of the inner pot shown in , wherein another arrangement shape of the local high permeability magnetic body is shown;

[0054] Fig.11 A graph showing the relationship between power and time of an electromagnetic cooking appliance having a pot of the present application during cooking;

[0055] Fig.12 It is a partial cross-sectional view of the inner pot according to the present application, wherein temperature points T1, T2 and T3 are shown.

[0056] Description of reference numerals:

[0057] 10 Low magnetic permeability non-metallic substrate

[0058] 20 Local high permeability magnets

[0059] 21The first local high permeability magnet

[0060] 22 Second local high permeability magnetic body

[0061] 23 Local auxiliary magnetic conductor

[0062] 30Electromagnetic heating device

[0063] S Projection Area

[0064] S1 High Sensitivity Area

[0065] S2 low magnetic sensitivity area

[0066] S11 function setting area

[0067] S12 non-function setting area DETAILED DESCRIPTION

[0068] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0069] In order to thoroughly understand the present application, a detailed description will be provided in the following description. Obviously, the implementation of the embodiments of the present application is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other embodiments.

[0070] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of the features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0071] Ordinal numbers such as “first” and “second” cited in the present application are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term “first component” itself does not imply the existence of the “second component”, and the term “second component” itself does not imply the existence of the “first component”.

[0072] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in this document are for illustrative purposes only and are not limiting.

[0073] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art.

[0074] The present application provides an electromagnetic cooking appliance that can cook food using electromagnetic heating technology. The electromagnetic cooking appliance can be, for example, an IH rice cooker, an induction cooker equipped with a pot, an IH pressure cooker or other cooking appliances, and the cooking appliance can have various functions such as cooking porridge in addition to cooking rice.

[0075] The electromagnetic cooking device comprises a pot and an electromagnetic heating device 30 disposed under the pot (see Figure 7B The electromagnetic heating device 30 includes an electromagnetic coil and a coil disk for winding the electromagnetic coil. The pot body includes a magnetic conductive material, has magnetic induction capability, and can generate heat by induction when the electromagnetic coil is energized.

[0076] For cooking appliances such as IH rice cookers, they include a cooker body and a cover body. The cooker body has a cylindrical pot inner storage portion. The pot inner can be fixedly arranged at the pot inner storage portion, or can be freely placed in the pot inner storage portion or taken out from the pot inner storage portion to facilitate the cleaning of the pot inner. The pot inner is usually made of metal material and has a circular opening on the upper surface for holding materials to be heated, such as rice, soup, etc. The cooker body includes an electromagnetic heating device 30 for heating the pot inner, such as an electromagnetic coil disk, to heat the pot inner.

[0077] The cover has a shape that is substantially the same as that of the pot body. The cover can be opened and closed on the pot body. Specifically, the cover is pivotally connected to the pot body via a pivot shaft and can freely pivot between a closed position and an open position relative to the pot body around a pivot axis where the pivot shaft is located, so as to facilitate closing and opening the pot body. When the cover is closed on the pot body, it covers the inner pot and forms a cooking space between the inner pot and the inner pot. The cover is usually also provided with a pot mouth sealing ring, which can be made of, for example, a rubber material, and is arranged between the cover and the inner pot to seal the cooking space when the cover is in the closed state.

[0078] For cooking appliances such as induction cookers, the pot and the induction cooker are independent of each other, and the pot can be placed on the upper surface of the induction cooker when in use.

[0079] In order to improve the heat convection in the pot during cooking, the present application provides a pot with better heat convection. Figure 1 A partial cross-sectional view of the inner pot is schematically shown, as shown in FIG. Figure 1 As shown, it includes a low-magnetic non-metallic matrix 10 and at least one local high-magnetic body 20. The low-magnetic non-metallic matrix 10 is a structural support for the inner pot, which constitutes a pot body with a receiving cavity. The local high-magnetic body 20 is arranged on the low-magnetic non-metallic matrix 10.

[0080] It should be noted that the term "body" used in this article includes a structure formed by mold forming, a block formed by a formed material such as a sheet, a layered body formed by a material such as a coating, and any other structure. Specifically, the local high-permeability magnetic body 20 includes a high-permeability block formed by a formed material such as a sheet, a high-permeability layer formed by a material such as a coating, or any other form of structure.

[0081] The low-permeability non-metallic matrix 10 is made of a low-permeability non-metallic material, which has a low relative magnetic permeability. The low-permeability non-metallic matrix 10 is not limited to one layer, and multiple layers can be set as needed, for example, by a composite of multiple layers of low-permeability non-metallic materials. Low-permeability non-metallic materials include, for example, at least one of ceramics, glass, carbon, etc. The local high-permeability magnetic body 20 is made of a high-permeability metal material or a high-permeability non-metallic material, which has a high relative magnetic permeability and can generate a large amount of heat under the action of a magnetic field. Among them, the high-permeability metal material includes, for example, any suitable material such as magnetic stainless steel and magnetic magnet, and the state of these materials can be a formed material such as a sheet, or an unformed material such as a magnetic powder containing it. Under a high-frequency magnetic field, if the common non-magnetic material is in the form of a very thin film, it can also be electromagnetically inductively heated due to increased resistance. Therefore, the high-permeability metal material also includes, for example, at least one of a magnetic magnet film, a magnetic silver film, a magnetic aluminum film, etc. The high-permeability non-metallic material includes, for example, any suitable material such as graphite.

[0082] When the cooking utensil is working, the low magnetic permeability non-metallic substrate 10 cannot induce heat because it cannot sense the magnetic field, or the induced magnetic field is weak and generates less heat; the local high magnetic permeability 20 can induce heat under the action of the magnetic field generated by the electromagnetic heating device 30, forming a local high temperature area.

[0083] The specific arrangement of the local high permeability magnetic bodies 20 is as follows: two adjacent local high permeability magnetic bodies 20 or adjacent parts of a single local high permeability magnetic body 20 are arranged at intervals in at least one of the radial, circumferential and height directions of the pot body. That is to say, the local high permeability magnetic bodies 20 are locally arranged in the low permeability non-metallic matrix 10 in a continuous or intermittent manner to form a local temperature difference area on the inner surface of the pot.

[0084] It can be understood that when the local high-permeability magnetic bodies 20 are arranged at the bottom of the pot body, for a pot body with a straight-walled bottom, the local high-permeability magnetic bodies 20 are arranged at intervals in at least one of the radial and circumferential directions of the pot body; for a pot body with an arc-shaped / spherical bottom, the local high-permeability magnetic bodies 20 are arranged at intervals in at least one of the radial, circumferential and height directions of the pot body.

[0085] When the local high permeability magnetic bodies 20 are arranged on the side of the pot body, for the pot body with a straight wall on the side, the local high permeability magnetic bodies 20 are arranged at intervals in at least one of the circumferential and height directions of the pot body; for the pot body with an arc-shaped / spherical side, the local high permeability magnetic bodies 20 are arranged at intervals in at least one of the radial, circumferential and height directions of the pot body.

[0086] Arranged in this way, refer to Figure 1The inner pot can have a high-sensitivity magnetic area S1 corresponding to the local high-permeability magnetic body 20 and a low-sensitivity magnetic area S2 corresponding to the interval between the local high-permeability magnetic body 20. The two adjacent high-sensitivity magnetic areas S1 or the adjacent parts of a single high-sensitivity magnetic area S1 are separated by the low-sensitivity magnetic area S2, and the heat generation area of ​​the non-metallic inner pot is reduced. When the cooking utensil is working, the local high-permeability magnetic body 20 generates heat, and the temperature of the inner surface of the inner pot is higher in the high-sensitivity magnetic area S1, and the temperature of the inner surface of the inner pot is lower in the low-sensitivity magnetic area S2, thereby forming a local temperature difference area between the two areas, which can produce a significant temperature gradient. The temperature gradient is used to make the heat convection in the pot faster and more intense, so that the liquid and ingredients in the pot boil and roll more fully, the ingredients are heated more evenly, and the cooked food tastes better.

[0087] In order to make the temperature gradient of the local temperature difference area more obvious, the relative magnetic permeability of the low-permeability non-metallic matrix 10 and the local high-permeability magnetic matrix 20 needs to be significantly different. For example, the relative magnetic permeability μ of the low-permeability non-metallic matrix 10 is r1 Greater than or equal to the preset relative permeability threshold μ r预设 , the relative magnetic permeability μ of the local high permeability magnetic body 20 r2 Less than the preset relative permeability threshold μ r预设 , where 10≤μ r预设 ≤100. μ can be set according to factors such as the rated power and thickness of the pot. r预设 The value of μ r预设 For example, it is set to any suitable value such as 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, etc. The difference Δμ between the relative magnetic permeability of the low-permeability non-metallic matrix 10 and the relative magnetic permeability of the local high-permeability magnetic body 20 is r It can be Δμ r ≥100, difference Δμ r For example, it may be any suitable value such as 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, etc.

[0088] like Figures 1 to 6 As shown, the local high magnetic permeability 20 is attached to the surface of the low magnetic permeability non-metallic substrate 10 and / or is at least partially located in the low magnetic permeability non-metallic substrate 10. The local high magnetic permeability 20 can be set to be exposed on the pot body or hidden inside the pot body as needed, and both can generate a large amount of heat by induction, with a large degree of design freedom.

[0089] Figure 1It is shown that the local high magnetic permeability 20 is attached to the inner surface of the low magnetic permeability non-metallic substrate 10. Of course, it can also be attached to the outer surface of the low magnetic permeability non-metallic substrate 10. The term "attachment" used in this article refers to connecting a material to an independent component by any means such as melt spraying. The material can be a formed material such as a sheet or an unformed material such as a coating. In this solution, the pot body composed of the low magnetic permeability non-metallic substrate 10 can have a uniform thickness, which is convenient for the production and manufacturing of the pot body.

[0090] Figure 2 It is shown that the local high magnetic permeability 20 is embedded in the low magnetic non-metallic matrix 10 from the inner surface of the low magnetic non-metallic matrix 10. Of course, it can also be embedded in the low magnetic non-metallic matrix 10 from the outer surface of the low magnetic non-metallic matrix 10. For example, the local high magnetic permeability 20 is completely embedded in the low magnetic non-metallic matrix 10, and the formed pot can have a flat inner surface. Or the local high magnetic permeability 20 is partially embedded in the low magnetic non-metallic matrix 10. Figure 3 It is shown that the local high magnetic permeability 20 is embedded in the low magnetic permeability non-metallic matrix 10, so that it is completely hidden inside the pot body. In the embedded and embedded solution, the thickness of the pot body can be set smaller without being affected by the thickness of the local high magnetic permeability 20, and the stability of the combination of the local high magnetic permeability 20 and the pot body is better, and the structure of the pot body is firm and stable.

[0091] The local high permeability magnetic body 20 can be arranged in the following manner: Figures 1 to 3 As shown, the local high permeability magnet 20 only includes the first local high permeability magnet 21 with the same relative magnetic permeability, and two adjacent first local high permeability magnets 21 or the adjacent parts of a single first local high permeability magnet 21 itself can be arranged at intervals in at least one of the radial, circumferential and height directions of the pot body. A non-magnetic material can be selected to form the local high permeability magnet 20 on the inner pot, which has a simple structure, is easy to produce and manufacture, and has a low material cost. This article defines different high permeability magnets based on relative magnetic permeability. For example, the first local high permeability magnets 21 at various positions in the inner pot have the same relative magnetic permeability.

[0092] for Figure 1 In the configuration, there is a space between two adjacent first local high-permeability magnetic bodies 21. Figure 2 and Figure 3 In the configuration mode, two adjacent first local high magnetic permeability bodies 21 are separated by a portion of the low magnetic permeability non-metallic matrix 10 .

[0093] like Figure 4 and Figure 5As shown, the local high permeability magnet 20 includes a first local high permeability magnet 21 and at least one second local high permeability magnet 22, and the relative magnetic permeabilities of the first local high permeability magnet 21 and the second local high permeability magnet 22 are different. The first local high permeability magnet 21 can be arranged with the second local high permeability magnet 22 in at least one of the radial, circumferential and height directions of the pot. Different high permeability materials can be selected to form the local high permeability magnet 20 on the pot. Different local high permeability magnets 20 generate different heat due to magnetic induction, which can increase the temperature difference, further promote the faster and more intense heat convection in the pot, and make the liquid and food in the pot boil and roll more fully, thereby improving the degree of design freedom.

[0094] like Figure 6 As shown, for Figures 1 to 3 In the scheme of the first local high permeability magnetic body 21 shown, the inner pot may further include a local auxiliary magnetic body 23. The local auxiliary magnetic body 23 can be located between two adjacent first local high permeability magnetic bodies 21 or between adjacent parts of a single first local high permeability magnetic body 21 itself. And the relative magnetic permeabilities of the local auxiliary magnetic body 23 and the first local high permeability magnetic body 21 are different. For example, the relative magnetic permeability difference between the first local high permeability magnetic body 21 and the local auxiliary magnetic body 23 is greater than or equal to 100, and usually the relative magnetic permeability of the former is greater than that of the latter. In this scheme, the local auxiliary magnetic body 23 can also generate heat through magnetism, and assist in heating the inner pot, so that the temperature of the inner pot in the low magnetic sensitivity area S2 will not be too low, thereby increasing the overall heating temperature of the inner pot.

[0095] In order to form a desired temperature gradient, there is a distance D between two adjacent local high permeability magnetic bodies 20 or between adjacent parts of a single local high permeability magnetic body 20 (see Figure 1 ), it can be understood that the spacing refers to the spacing on the plane or curved surface of the pot body; for example, for a pot with a straight-walled bottom, the spacing refers to the spacing on the plane of the pot body; for a pot with an arc-shaped / spherical bottom, the spacing refers to the spacing on the curved surface of the pot body.

[0096] The spacing D can be 6mm≤D≤80mm, for example, it can be any value such as 6mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, etc. The thickness of the inner pot is generally 3mm to 10mm. The range of spacing D can be set to be different for inner pots of different thicknesses. For example, schematically, when the thickness of the inner pot is 3mm, the spacing D can be 6mm≤D≤60mm; when the thickness of the inner pot is 10mm, the spacing D can be 20mm≤D≤80mm. For general inner pots, the spacing D is preferably not less than 20mm, preferably not more than 60mm, for example, it can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm. Preferably, 20mm≤D≤40mm.

[0097] The surface is attached with a local high-permeability magnetic body, and the outer surface of the pot body (not shown) is embedded with a local high-permeability magnetic body. Heat is transferred from the outer surface of the pot to the inner surface of the pot body, and there is heat loss. In order to obtain a temperature gradient within a desired range on the inner surface of the pot body, the present application sets the range of the spacing D based on Fourier's heat conduction law. In general, the spacing D is related to at least one of the thermal conductivity λ, the heat flux density q, and the thickness d.

[0098] Specifically, Fourier heat conduction formula:

[0099]

[0100] For the present application, in formula (1), q is the heat flux density (w / m 2 ), λi is the thermal conductivity of the pot [w / (m·k)], ΔT i is the temperature difference caused by heat transfer in the thickness direction of the pot (℃), and d is the thickness of the pot (m).

[0101] For this embodiment, since the thickness of the local high magnetic permeability is usually very small relative to the pot body and can be basically ignored, the thermal conductivity of the pot body can be considered separately, that is, the thermal conductivity of the low magnetic permeability non-metallic matrix λ replaces λ i .

[0102] Transforming the above formula we get:

[0103]

[0104] It can be seen from formula (2) that if the lateral temperature difference of the inner surface of the pot (i.e., the temperature difference between the highest temperature point and the lowest temperature point on the inner surface of the pot in adjacent high magnetic sensitivity areas and low magnetic sensitivity areas) is increased, if the power of the pot remains unchanged, the heat transfer distance needs to be increased.

[0105] The local temperature difference area has the maximum temperature difference ΔT, that is, the temperature difference between the highest temperature point and the lowest temperature point on the inner surface of the pot. The spacing D is related to at least one of the thermal conductivity λ, the maximum temperature difference ΔT, the heat flux density q and the thickness d. Specifically, the spacing D can be related to any one, two, three or four of these parameters.

[0106] like Fig.12As shown, a temperature point T1 is selected on the outer surface of the pot, where the temperature point T1 is located at the edge of the local high-permeability magnetic body at the interval; two temperature points T2 and T3 are selected on the inner surface of the pot, where the temperature point T2 corresponds to the position of the temperature point T1 in the thickness direction, which is the highest temperature point mentioned above, and the temperature point T3 corresponds to the center position of the spacing D of the local high-permeability magnetic body, which is the lowest temperature point mentioned above. Therefore, the maximum temperature difference ΔT = T2-T3. The heat transfer distance from the temperature point T1 to T2 is L1, and the heat transfer distance from the temperature point T1 to T3 is L2, where L1 = d.

[0107] The formula for the maximum temperature difference ΔT is:

[0108]

[0109] According to Fourier's law, in order to make a certain temperature difference between T2 and T3, the maximum temperature difference ΔT is set to a℃~b℃, that is, a is the minimum temperature difference and b is the maximum temperature difference. According to experimental test results, the maximum temperature difference ΔT is most suitable in the range of 15℃~30℃, so that the heat convection is enhanced while the bottom ingredients in the pot will not be undercooked due to excessive temperature difference.

[0110] Substituting the range of ΔT into formula (3), we obtain:

[0111]

[0112] Substituting L1=d into equation (4), we obtain:

[0113]

[0114] Depend on Fig.12 It can be seen that the temperature points T1, T2 and T3 form a right triangle on the cross section, so (D / 2) 2 +L1 2 =L2 2 , and put it and L1=d into the relation (5), we get:

[0115]

[0116] Therefore, the spacing D is related to the maximum temperature difference ΔT, thermal conductivity λ, heat flux q and thickness d, and needs to satisfy the above relationship (6). Based on the above relationship (6), it can be seen that when the thermal conductivity λ of the low magnetic permeability non-metallic substrate is large, a larger spacing D needs to be set to ensure that the maximum temperature difference ΔT is within the expected range of a℃~b℃; for a pot with a larger thickness, a larger spacing D also needs to be set to ensure that the maximum temperature difference ΔT is within the expected range of a℃~b℃; for a pot with a larger rated power, a smaller spacing D needs to be set to ensure that the maximum temperature difference ΔT is within the expected range of a℃~b℃.

[0117] For a general pot, the thermal conductivity is different according to the material of the low magnetic non-metallic substrate. For the low magnetic non-metallic material suitable for the pot of the present application, its thermal conductivity λ can be 0.1w / (m·k) to 10w / (m·k), for example, it can be 0.1w / (m·k), 0.5 / (m·k), 1.0w / (m·k), 1.5w / (m·k), 2.0w / (m·k), 3.0w / (m·k), 4.0w / (m·k), 5.0w / (m·k), 6.0w / (m·k), 7.0w / (m·k), 8.0w / (m·k), 9.0w / (m·k), 10.0w / (m·k), etc. The thickness d of the pot is generally 3mm to 10mm as mentioned above. Based on the above relationship of the spacing D, the approximate range of the spacing D can be obtained, which is 6mm to 80mm.

[0118] It should be noted that the maximum temperature difference ΔT may be optionally set within the range of 15° C. to 30° C. If necessary and / or desired, the maximum temperature difference ΔT may also fluctuate within the range of 15° C. to 30° C.

[0119] The area for setting the local high permeability magnetic body 20 also needs to be at a desired level. Specifically, the pot has a function setting area S11 for arranging the local high permeability magnetic body 20, wherein see Fig. 7A The function setting area S11 takes the horizontal reference plane where the highest position point of the local high permeability magnetic body 20 in the height direction is located as the boundary P. Fig. 7A The dotted line schematically shows the approximate position of the boundary P. The area below the boundary P is the function setting area S11, and the area above the boundary P is the non-function setting area S12. The area ratio of the local high permeability magnetic body 20 in the function setting area is 50% to 90%, for example, the area ratio can be any suitable ratio such as 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%. The area ratio of the local high permeability magnetic body 20 is reasonably set so that the heat generated by the local high permeability magnetic body 20 can meet the cooking requirements and the heating power reaches the desired level.

[0120] Optionally, the function setting area can be defined based on the projection area S of the electromagnetic coil of the electromagnetic cooking appliance on the inner pot, and the projection area S is the function setting area S11, wherein the projection area has the vertical projection of the outermost contour of the electromagnetic coil on the outer surface of the inner pot as the outermost boundary, and has the vertical projection of the innermost contour of the electromagnetic coil on the outer surface of the inner pot as the innermost boundary. The local high-permeability magnetic body 20 can be arranged in the projection area S of the electromagnetic coil on the inner pot, and the pot body outside the projection area S is not provided with the local high-permeability magnetic body 20, so that the magnetic field generated by the electromagnetic coil completely covers the area with the local high-permeability magnetic body 20, so that heat convection is generated within the range covered by the magnetic field, and the electromagnetic heating efficiency is high. For example, the electromagnetic heating device 30 includes a bottom electromagnetic heating device located at the bottom or below the inner pot, Figure 7B The schematic diagram shows the area covered by the bottom electromagnetic heating device relative to the inner pot. The local high permeability magnetic body 20 is arranged in the projection area S of the bottom electromagnetic heating device on the inner pot (see Figure 7B ), and the area in the projection area S accounts for 50% to 90%. For electromagnetic cooking appliances such as IH rice cookers, the electromagnetic heating device 30 also includes a side electromagnetic heating device located at the side of the inner pot, and the local high-permeability magnetic body 20 of the inner pot is arranged in the projection area S of the side electromagnetic heating device on the inner pot, and the area in the projection area S accounts for 50% to 90%.

[0121] Alternatively, the pot has a height H, and the function setting area is located in the area below 2 / 3H of the pot. That is to say, the local high permeability magnetic body 20 is arranged in the area below 2 / 3H of the pot. It can be understood that the local high permeability magnetic body 20 needs to be located within the projection area S of the electromagnetic heating device 30 first, and then can be arranged in the area below 2 / 3H of the pot. This solution makes the local temperature difference area formed on the inner surface of the pot exist below the normal height of the liquid and food in the pot, which can more effectively promote the thermal convection of the liquid and food.

[0122] The local high-permeability magnetic body 20 can be formed by any method such as spraying, coating or mechanical inlay, and the formed local high-permeability magnetic body 20 can fit tightly with the pot body and is not easy to separate. A whole piece of material can be selected and formed into the pot body, and then the local material at the desired position is removed to form the local high-permeability magnetic body 20. The removal method can be turning, sandblasting, corrosion, etc. Alternatively, multiple pieces of material can be selected and the multiple pieces of material can be formed together or separately into the desired position of the pot body to form the local high-permeability magnetic body 20.

[0123] In addition to the local high magnetic permeability 20 provided on the pot body, the pot inner shell may further include at least one auxiliary functional layer, which is provided on the outer surface and / or inner surface of the pot body with the local high magnetic permeability 20. In other words, the auxiliary functional layer is located on the outer layer or the inner layer of the local high magnetic permeability 20 and the pot body, and the auxiliary functional layer may include any structural layer such as a non-stick coating and a protective layer.

[0124] The arrangement shape of the local high permeability magnetic body 20 is not limited, such as Figures 8 to 10 As shown, the local high-permeability magnetic bodies 20 are arranged in a ring or array. By arranging the local high-permeability magnetic bodies 20 in a ring or array, neatly arranged local temperature difference areas can be formed, which is conducive to better controlling the thermal convection heating of the liquid and food in the pot, the thermal convection effect is better, and the food at various positions in the pot is heated more evenly.

[0125] Figure 8 It is shown that the local high permeability magnetic bodies 20 are arranged in a ring shape. Specifically, the local high permeability magnetic bodies 20 are arranged in a ring shape along the circumference of the pot, and in a concentric ring array along the radial direction of the pot and / or in a row along the height direction of the pot. Between two adjacent local high permeability magnetic bodies 20 is a ring-shaped low permeability non-metallic substrate 10, thereby forming a ring-shaped low magnetic sensitivity area S2. As described above, for a pot with a straight wall at the bottom, the local high permeability magnetic bodies 20 are arranged in a concentric ring array along the radial direction of the pot at the bottom of the pot body; for a pot with an arc-shaped / spherical bottom, the local high permeability magnetic bodies 20 are arranged in a concentric ring array along the radial direction of the pot at the bottom of the pot body and are arranged in sequence along the height direction of the pot. The radius of the annular local high permeability magnetic body 20 located at the radially outermost side can correspond to the radius of the outer contour of the electromagnetic coil at the bottom; the radius of the annular local high permeability magnetic body 20 located at the radially innermost side can correspond to the radius of the inner contour of the electromagnetic coil at the bottom.

[0126] For a pot with a straight wall on the side, the local high-permeability magnetic bodies 20 are arranged in sequence along the height direction of the pot on the side of the pot; for a pot with an arc-shaped / spherical side, the local high-permeability magnetic bodies 20 are arranged in sequence along the height direction of the pot in a concentric ring array on the side of the pot along the radial direction of the pot. The spacing D between two adjacent annular local high-permeability magnetic bodies 20 is greater than or equal to 6mm to 20mm, and preferably the spacing D is 20mm to 40mm, so that a significant heat convection effect can be achieved.

[0127] In an embodiment not shown, the local high permeability magnetic bodies 20 may be arranged in a spiral shape. The spiral design is similar to the above-mentioned ring shape, and can form continuous local high permeability magnetic bodies 20 in the circumferential direction. In addition, the local high permeability magnetic bodies 20 may also be arranged in other shapes similar to ring shapes.

[0128] Regarding the description of the two adjacent local high permeability magnets 20 or the adjacent parts of a single local high permeability magnet 20 itself, for example, in the annular arrangement scheme, there are two local high permeability magnets 20 that are adjacent to each other and spaced apart. If necessary and / or desired, a connection can be formed between the two adjacent local high permeability magnets 20 so that there is no gap at their connection; in the spiral arrangement scheme, a single local high permeability magnet 20 has two parts that are adjacent to each other due to the gap.

[0129] Fig. 7A , Fig. 9 and Fig.10 It is shown that the local high permeability magnetic bodies 20 are arranged in a circumferential array. The difference is that Fig. 7A and Fig. 9 The area of ​​the pattern formed by the local high permeability magnetic body 20 is larger than Fig.10 The area of ​​the figure formed by the local high permeability magnetic body 20. Fig. 7A and Fig. 9 The middle pattern is arranged in a block array along the circumference. Fig.10 The middle figure forms a dot array arrangement along the circumferential direction. For these two circumferential array arrangements, the local high-permeability magnetic bodies 20 are arranged in an annular array along the circumference of the inner pot, and are arranged in rows along the radial and / or height direction of the inner pot, and the local high-permeability magnetic bodies 20 in adjacent rows are aligned or staggered.

[0130] Fig. 7A The block pattern of the local high permeability magnetic body 20 is shown to be circular in shape. Fig. 9 The block pattern of the local high permeability magnetic body 20 is shown to be an ellipse. Fig. 9 Four elliptical block patterns are schematically shown. The number of patterns should be no less than 2, preferably 3 to 16, so that a better heat convection effect can be achieved. The maximum radius of the elliptical pattern corresponds to the radius of the outer contour of the electromagnetic coil at the bottom, and the minimum radius corresponds to the radius of the inner contour of the electromagnetic coil at the bottom. Through this arrangement, multiple circumferential convection areas can be formed in the pot to promote boiling effect. In addition to the elliptical shape, the pattern of the local high permeability magnetic body 20 can also be any arbitrary shape such as a square shape, a long strip shape, etc.

[0131] Fig.10 The dotted pattern of the local high permeability magnetic body 20 is shown to be circular in shape. Fig.10 12 circular dot patterns are schematically shown. The number of patterns should preferably be no less than 3, preferably 4 to 20, and the area of ​​each pattern should be within 0.1 cm 2 ~50cm 2The spacing D between the patterns can be set to be greater than 7mm to 35mm according to the thickness of the pot, so that there can be a significant heat convection effect. In addition to the circular shape, the pattern of the local high permeability magnetic body 20 can also be any arbitrary shape such as an ellipse, a polygon, etc.

[0132] It can be understood that the local high permeability magnetic bodies 20 can be arranged in the pot in the same graphic arrangement, that is, the graphic arrangement includes one of an annular arrangement, a block array arrangement, and a dot array arrangement. Of course, the graphic arrangement can also include a combination of two or three of the annular arrangement, the block array arrangement, and the dot array arrangement.

[0133] According to Fourier's law of heat conduction, the temperature difference generated by the pot during cooking is also related to the heating power. Therefore, the present application provides a control method so that the temperature difference can be adjusted according to the cooking process to improve the cooking effect. The control method can be applied to any type of cooking, such as cooking porridge and rice.

[0134] Fig.11 The figure schematically shows the change of power over time. Fig.11 As shown, the control method includes heating the inner pot with a first preset power P1 in a heating process, wherein the first preset power P1 is equal to the maximum power P, or close to the maximum power P.

[0135] The heating process uses high-power heating, and the inner surface of the pot produces a large temperature difference in different local temperature difference areas. The large temperature difference is used to enhance the convection of food and water in the pot, so that the temperature of the water in the pot can be quickly transferred and heated.

[0136] The cooking method further includes heating the pot with a second preset power P2 during the boiling process, wherein the second preset power P2 gradually decreases from the first preset power P1 as the heating time increases. Fig.11 As shown, it decreases gradually in a linear manner, and the second preset power P2 is in the range of (1 / 30-1 / 3)P.

[0137] The power of the boiling process gradually decreases with the heating time, and the inner surface of the pot produces a smaller temperature difference in different local temperature difference areas. The convection degree of food and water in the pot is reduced, avoiding the phenomenon of overflowing due to excessive power after boiling.

[0138] It should be noted that the above powers are all average powers of the process, and heating can be achieved by adjusting the power or the power ratio.

[0139] Experimental Testing

[0140] Preparation of pot 1, 2 and 3.

[0141] The embodiments of the pot inner shell 1, 2 and 3 all include a low-permeability non-metallic matrix and a local high-permeability magnetic body. The materials and dimensions such as thickness of the low-permeability non-metallic matrix are the same, and the materials and dimensions such as thickness and area ratio of the local high-permeability magnetic body are the same. The difference is that the local high-permeability magnetic body 20 in the embodiment of the pot inner shell 1 is arranged in a ring shape, the local high-permeability magnetic body 20 in the embodiment of the pot inner shell 2 is arranged in a block array, and the local high-permeability magnetic body 20 in the embodiment of the pot inner shell 3 is arranged in a point array.

[0142] Use control pot

[0143] A common pot with the same model as that of the pots 1, 2 and 3 is selected as the control pot. The common pot adopts a non-magnetic non-metallic substrate, and a layer of magnetic sensitive material is evenly coated on the outer surface of the substrate.

[0144] Using the control method of this embodiment, a cooking test of porridge was conducted on the implementation pots 1, 2 and 3 and the control pot. 1300g of water and 150g of rice were added, and the control conditions were the same. After the cooking was completed, the porridge cooked using the implementation pots 1, 2 and 3 and the control pot was tested for water evaporation and viscosity.

[0145] The test method for water evaporation is to obtain the weight difference between the ingredients and water before and after cooking. The weight is the water evaporation. The test method for viscosity is to stir the cooked porridge for several times and take the upper layer of juice, and test the viscosity of the porridge with a texture analyzer.

[0146] Results Analysis

[0147] The test results of water evaporation and viscosity are shown in Table 1 below.

[0148] Table 1

[0149]

[0150]

[0151] From Table 1 above, it can be seen that the amount of water evaporated from the porridge cooked using the implementation pots 1, 2 and 3 and the control pot fluctuates around 90g, and the amount of water evaporated varies slightly, which is basically the same. Compared with the control pot, the viscosity of the porridge cooked using the implementation pots 1, 2 and 3 is improved to a certain extent, and the increase ranges from 5% to 10%, indicating that the convection heating is achieved by using the local temperature difference, so that the porridge is cooked more thoroughly, more precipitates are produced, and the taste is better. In addition, the viscosity corresponding to the implementation pots 1, 2 and 3 gradually increases. It can be inferred that the more dispersed the local high-conductivity magnetic body 20 is, the better the convection heating effect is.

[0152] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present application. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present application. The features described herein in one embodiment may be applied to another embodiment individually or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0153] The present application has been illustrated through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and explanation, and the present application is not limited to the above-mentioned embodiments. According to the teachings of the present application, more variations and modifications can be made, and these variations and modifications all fall within the scope of protection claimed by the present application.

Claims

1. A pot for electromagnetic cooking, characterized in that: The pot comprises: A low-magnetic-permeability non-metallic matrix, wherein the low-magnetic-permeability non-metallic matrix forms a pot body having a receiving cavity; and At least one local high-permeability magnetic body, the local high-permeability magnetic body is arranged on the outer surface of the low-permeability non-metallic matrix, and two adjacent local high-permeability magnetic bodies or adjacent parts of a single local high-permeability magnetic body are arranged at intervals in at least one of the radial direction, circumferential direction and height direction of the pot body to form a local temperature difference area on the inner surface of the pot body, Among them, the thermal conductivity of the low magnetic permeability non-metallic matrix is ​​λ, the heat flux density of the low magnetic permeability non-metallic matrix is ​​q and its thickness is d, there is a spacing D between two adjacent local high magnetic permeabilities or between adjacent parts of a single local high magnetic permeability itself, and there is a maximum temperature difference ΔT in the local temperature difference area, and the spacing D is related to at least one of the thermal conductivity λ, the maximum temperature difference ΔT, the heat flux density q and the thickness d.

2. The pot according to claim 1, characterized in that: The maximum temperature difference ΔT in the local temperature difference area is a°C to b°C, and the spacing D is related to the thermal conductivity λ, the maximum temperature difference ΔT, the heat flux density q and the thickness d, and satisfies the following relationship:

3. The inner pot of claim 1, characterized in that: The maximum temperature difference ΔT is 15°C to 30°C, the thermal conductivity λ is 0.1w / (m·k) to 10w / (m·k), the thickness d is 3mm to 10mm, and the spacing D is 6mm to 80mm.

4. The inner pot of claim 1, characterized in that: The inner pot has a function setting area for arranging the local high magnetic permeability, and the area of ​​the local high magnetic permeability in the function setting area accounts for 50% to 90%.

5. The inner pot of claim 4, characterized in that: The function setting area is defined based on a projection area of ​​the electromagnetic coil of the electromagnetic cooking appliance on the inner pot; and / or The inner pot has a height H, and the function setting area is located in an area below 2 / 3H of the inner pot.

6. The pot according to claim 1, characterized in that: The relative magnetic permeability μ of the low magnetic permeability non-metallic substrate r1 Less than the preset relative permeability threshold μ r预设 , the relative magnetic permeability μ of the local high permeability magnetic body r2 Greater than or equal to the preset relative permeability threshold μ r预设 , where 10≤μ r预设 ≤100; and / or The difference Δμ between the relative magnetic permeability of the low-permeability non-metallic matrix and the relative magnetic permeability of the local high-permeability magnetic body r =Δμ r ≥100.

7. The pot according to claim 1, characterized in that: The local high magnetic permeability includes a first local high magnetic permeability and a second local high magnetic permeability, wherein the first local high magnetic permeability and the second local high magnetic permeability are arranged at intervals in at least one of the radial direction, the circumferential direction and the height direction of the inner pot. The relative magnetic permeabilities of the first local high magnetic permeability and the second local high magnetic permeability are different.

8. The pot according to claim 1, characterized in that: The local high permeability magnetic body includes a first local high permeability magnetic body and a local auxiliary permeability magnetic body, wherein the local auxiliary permeability magnetic body is located between two adjacent first local high permeability magnetic bodies or between adjacent parts of a single first local high permeability magnetic body. Wherein, the relative magnetic permeabilities of the local auxiliary magnetic conductor and the first local high magnetic conductor are different.

9. The inner pot according to any one of claims 1 to 8, characterized in that: The local high magnetic permeability body is attached to the outer surface of the low magnetic permeability non-metallic substrate; or The local high magnetic permeability body is embedded into the low magnetic permeability non-metallic matrix from the outer surface of the low magnetic permeability non-metallic matrix.

10. The inner pot according to any one of claims 1 to 8, characterized in that: The low magnetic permeability non-metallic matrix is ​​made of a low magnetic permeability non-metallic material, wherein the low magnetic permeability non-metallic material includes at least one of ceramic, glass, and carbon; and / or The local high magnetic permeability body is made of a high magnetic permeability metal material or a high magnetic permeability non-metal material. The high magnetic permeability metal material includes at least one of magnetic stainless steel, magnetic magnet, magnetic magnet film, magnetic silver film, and magnetic aluminum film. The high magnetic permeability non-metal material includes graphite.

11. The inner pot according to any one of claims 1 to 8, characterized in that: The local high-permeability magnetic bodies are arranged in an array, a ring or a spiral.

12. The inner pot according to any one of claims 1 to 8, characterized in that: The inner pot also includes at least one auxiliary functional layer, and the auxiliary functional layer is arranged on the outer surface and / or inner surface of the pot body with the local high magnetic permeability.

13. An electromagnetic cooking appliance, characterized in that: The electromagnetic cooking appliance comprises an electromagnetic heating device and the inner pot according to any one of claims 1 to 12, wherein the electromagnetic heating device is used for electromagnetically heating the inner pot.

14. The electromagnetic cooking device according to claim 13, characterized in that: The electromagnetic heating device includes a bottom electromagnetic heating device located at the bottom of the pot and / or a side electromagnetic heating device located at the side of the pot. The local high magnetic permeability of the pot is arranged in the projection area of ​​the bottom electromagnetic heating device and / or the side electromagnetic heating device on the pot.

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