Pot container and electromagnetic cooking utensil

Abstract

The utility model discloses a pot liner and an electromagnetic cooking utensil, the pot liner comprises a low-permeability metal base body and at least one local high-permeability magnet, and the low-permeability metal base body forms a pot body with an accommodating cavity; the local high magnetizers are arranged on the low-permeability metal 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, and the distance D is related to at least one of the heat conductivity coefficients lambda1 and lambda2, the thicknesses d1 and d2, the maximum temperature difference delta T and the heat flow density q. According to the utility model, an obvious temperature gradient can be generated in a local temperature difference area during cooking, and heat convection in the pot becomes fast and violent by utilizing the temperature gradient, so that liquid and food materials in the pot are boiled and turned over more fully, the food materials are heated more uniformly, and cooked food tastes better.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, 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 metal materials, which usually have no magnetic conductivity or low magnetic conductivity, so a magnetic inductive 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. Utility Model Content

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

[0006] In order to at least partially solve the above problems, the utility model provides a pot inner shell for electromagnetic cooking apparatus, the pot inner shell comprising:

[0007] A low magnetic permeability metal substrate, wherein the low magnetic permeability metal substrate forms a pot body having a receiving cavity; and

[0008] At least one local high magnetic permeability body, the local high magnetic permeability body is arranged on the outer surface of the low magnetic permeability metal substrate, and two adjacent local high magnetic permeabilities or adjacent parts of a single local high magnetic permeability 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] In which, the low magnetic permeability metal matrix has a first thickness d1 and a first thermal conductivity λ1, the local high magnetic permeability body has a second thickness d2 and a second thermal conductivity λ2, the local temperature difference area has a maximum temperature difference ΔT, the heat flux density of the low magnetic permeability metal matrix is ​​q, and there is a spacing D between two adjacent local high magnetic permeabilities or between adjacent parts of a single local high magnetic permeability body itself, and the spacing D is related to at least one of the first thermal conductivity λ1, the second thermal conductivity λ2, the first thickness d1, the second thickness d2, the maximum temperature difference ΔT and the heat flux density q.

[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 the adjacent parts of a single high-sensitivity magnetic area are separated by a low-sensitivity magnetic area, and the heat-generating area of ​​the metal 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 outer surface of the pot has a temperature point T1, and the local temperature difference area has a highest temperature point T2 and a lowest temperature point T3, wherein T2 corresponds to T1 in the thickness direction, the maximum temperature difference ΔT=T2-T3, and ΔT is a°C to b°C;

[0013] The heat transfer distance from the temperature point T1 to the highest temperature point T2 is L1, and the heat transfer distance from the temperature point T1 to the lowest temperature point T3 is L2, where L1 = d = d1 + d2; and

[0014] The spacing D is related to the first thermal conductivity λ1, the second thermal conductivity λ2, the first thickness d1, the second thickness d2, the maximum temperature difference ΔT and the heat flux density q, and satisfies the following relationship:

[0015] as well as

[0016]

[0017] According to this solution, when the thermal conductivity λ1 of the low magnetic permeability metal 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℃.

[0018] Optionally, the maximum temperature difference ΔT is 15°C to 30°C, the first thermal conductivity λ1 is 30w / (m·k) to 250w / (m·k), the second thermal conductivity λ2 is 0.01w / (m·k) to 100w / (m·k), the first thickness d1 is 1.9mm to 8mm, the second thickness d2 is 0.1mm to 2mm, and the spacing D is 7mm to 100mm.

[0019] According to this solution, the metal pot can obtain the desired temperature gradient of 15°C to 30°C, and the thermal convection effect of the liquid and ingredients in the pot is good, which can meet cooking needs.

[0020] 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 30% to 90%.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Optionally, the local high magnetic permeability includes a first local high magnetic permeability and a second local high magnetic permeability, and 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 pot.

[0026] The relative magnetic permeabilities of the first local high magnetic permeability and the second local high magnetic permeability are different.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Optionally, the local high magnetic permeability is attached to the outer surface of the low magnetic permeability metal substrate; thereby, the pot body formed by the low magnetic permeability metal substrate can have a uniform thickness, which facilitates the production of the pot body.

[0031] Alternatively, the local high magnetic permeability is embedded into the low magnetic permeability metal matrix from the outer surface of the low magnetic permeability metal 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.

[0032] Optionally, the relative magnetic permeability μ of the low magnetic permeability metal 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

[0033] The difference Δμ between the relative magnetic permeability of the low magnetic permeability metal matrix and the relative magnetic permeability of the local high magnetic permeability r Δμr≥100.

[0034] 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.

[0035] Optionally, the low magnetic permeability metal matrix is ​​made of a low magnetic permeability metal material, and the low magnetic permeability metal material includes at least one of aluminum, copper, low magnetic permeability stainless steel, magnesium, and titanium; and / or the local high magnetic permeability body is made of a high magnetic permeability metal material or a high magnetic 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 non-metallic material includes graphite.

[0036] 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.

[0037] Optionally, the local high permeability magnetic bodies are arranged in an array, a ring or a spiral.

[0038] 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.

[0039] 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.

[0040] According to this solution, the inner pot can have more functions such as non-stick function, anti-scratch function, etc.

[0041] According to another aspect of the utility model, an electromagnetic cooking utensil 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.

[0042] 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.

[0043] 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.

[0044] 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

[0045] The following drawings of the present invention are used as a part of the present invention for understanding the present invention. The drawings show the implementation of the present invention and its description, and are used to explain the principle of the present invention.

[0046] In the attached figure:

[0047] Figure 1 It is a partial cross-sectional view of a pot according to an embodiment of the utility model;

[0048] Figure 2It is a partial cross-sectional view of a pot according to another embodiment of the utility model;

[0049] Figure 3 It is a partial cross-sectional view of a pot according to another embodiment of the utility model;

[0050] Figure 4 It is a partial cross-sectional view of a pot according to another embodiment of the utility model;

[0051] Figure 5 It is a partial cross-sectional view of a pot according to another embodiment of the utility model;

[0052] Figure 6 It is a partial cross-sectional view of a pot according to another embodiment of the utility model;

[0053] Fig. 7A for Figure 1 A three-dimensional view of the pot shown in FIG.

[0054] Figure 7B for Figure 1 The schematic diagram of the position of the pot and the heating coil shown in FIG.

[0055] Figure 8 for Figure 1 A partial schematic diagram of a pot shown in , wherein a layout shape of a local high-permeability magnetic body is shown;

[0056] 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;

[0057] 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;

[0058] Fig.11 A graph showing the relationship between power and time of an electromagnetic cooking appliance having the pot of the utility model during cooking;

[0059] Fig.12 Schematic diagram of sampling location for moisture deviation test;

[0060] Fig.13 It is a partial cross-sectional view of the pot inner body according to the utility model, wherein temperature points T1, T2 and T3 are shown.

[0061] Description of reference numerals:

[0062] 10 Low magnetic permeability metal substrate

[0063] 20 Local high permeability magnetic body

[0064] 21 The first local high permeability magnetic body

[0065] 22 Second local high permeability magnetic body

[0066] 23 Local auxiliary magnetic conductor

[0067] 30 Electromagnetic heating device

[0068] S Projection area

[0069] S1 High sensitivity area

[0070] S2 Low magnetic sensitivity area

[0071] S11 function setting area

[0072] S12 Non-function setting area DETAILED DESCRIPTION

[0073] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0074] In order to thoroughly understand the present invention, a detailed description will be provided in the following description. Obviously, the implementation of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0075] 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 utility model. 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.

[0076] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers 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".

[0077] 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.

[0078] Now, exemplary embodiments according to the present utility model 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 utility model thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art.

[0079] The utility model 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 electromagnetic 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 the function of cooking rice.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] In order to improve the heat convection in the pot during cooking, the utility model 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 permeability metal matrix 10 and at least one local high magnetic permeability body 20. The low magnetic permeability metal matrix 10 is a structural support body of the pot body, which constitutes a pot body with a receiving cavity. The local high magnetic permeability body 20 is arranged on the low magnetic permeability metal matrix 10.

[0085] 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.

[0086] The low magnetic permeability metal substrate 10 is made of a low magnetic permeability metal material, which has a low relative magnetic permeability. The low magnetic permeability metal substrate 10 is not limited to one layer, and multiple layers can be set as needed, for example, by compounding multiple layers of low magnetic permeability metal materials. The low magnetic permeability metal material includes, for example, at least one of aluminum, copper, low magnetic permeability stainless steel, magnesium, titanium, etc. The local high magnetic permeability body 20 is made of a high magnetic permeability metal material or a high magnetic 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 magnetic permeability metal material includes, for example, any suitable material such as magnetic stainless steel and magnetic permeability magnet, and the state of these materials can be a formed material such as a sheet, or an unformed material such as a magnetic permeability 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, so the high magnetic permeability metal material also includes, for example, at least one of a magnetic permeability magnet film, a magnetic permeability silver film, a magnetic permeability aluminum film, etc. The high magnetic permeability non-metallic material includes, for example, any suitable material such as graphite.

[0087] When the cooking utensil is working, the low magnetic permeability metal 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.

[0088] 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 on the low permeability magnetic metal matrix 10 in a continuous or intermittent manner to form a local temperature difference area on the inner surface of the pot.

[0089] 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.

[0090] 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.

[0091] Arranged in this way, refer to Figure 1 , the 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 metal inner pot is reduced. When the cooking utensil is working, the local high-permeability magnetic body 20 generates heat, 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.

[0092] In order to make the temperature gradient of the local temperature difference area more obvious, the relative magnetic permeability of the low magnetic permeability metal substrate 10 and the local high magnetic permeability 20 needs to be significantly different. For example, the relative magnetic permeability μ of the low magnetic permeability metal substrate 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 magnetic permeability metal substrate 10 and the relative magnetic permeability of the local high magnetic permeability 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.

[0093] like Figures 1 to 6 As shown, the local high magnetic permeability 20 is attached to the surface of the low magnetic permeability metal substrate 10 and / or is at least partially located in the low magnetic permeability metal 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.

[0094] Figure 1 It is shown that the local high magnetic permeability 20 is attached to the inner surface of the low magnetic permeability metal substrate 10. Of course, it can also be attached to the outer surface of the low magnetic permeability metal 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 metal substrate 10 can have a uniform thickness, which is convenient for the production and manufacturing of the pot body.

[0095] Figure 2 It is shown that the local high magnetic permeability 20 is embedded in the low magnetic permeability metal matrix 10 from the inner surface of the low magnetic permeability metal matrix 10. Of course, it can also be embedded in the low magnetic permeability metal matrix 10 from the outer surface of the low magnetic permeability metal matrix 10. For example, the local high magnetic permeability 20 is fully embedded in the low magnetic permeability metal 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 permeability metal matrix 10. Figure 3 It is shown that the local high magnetic permeability 20 is embedded in the low magnetic permeability metal matrix 10, so that it is completely hidden in 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.

[0096] 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.

[0097] for Figure 1 In the configuration, there is a space between two adjacent first local high-permeability magnetic bodies 21. Figure 2 and Figure 3In the configuration mode, two adjacent first local high magnetic permeability bodies 21 are separated by a portion of the low magnetic permeability metal substrate 10 .

[0098] like Figure 4 and Figure 5 As 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.

[0099] 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.

[0100] 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.

[0101] The spacing D can be 7mm≤D≤100mm, for example, it can be any value such as 7mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, etc. The thickness of the inner pot is generally 2mm 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 2mm, the spacing D can be 7mm≤D≤80mm; when the thickness of the inner pot is 10mm, the spacing D can be 35mm≤D≤100mm. For general inner pots, the spacing D is preferably not less than 20mm, preferably not more than 80mm, for example, it can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm. Preferably, 20mm≤D≤60mm.

[0102] For a pot having a local high magnetic conductivity on the outer surface, for example, Figure 1 The outer surface of the pot shown is attached with a local high magnetic permeability, and the outer surface of the pot not shown is embedded with a local high magnetic permeability. Heat is transferred from the outer surface of the pot to the inner surface of the pot, and there is heat loss. In order to obtain a temperature gradient within a desired range on the inner surface of the pot, the utility model 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.

[0103] Specifically, Fourier heat conduction formula:

[0104]

[0105] 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)], ΔTi is the temperature difference formed by heat transfer in the thickness direction of the pot (℃), and d is the thickness of the pot (m).

[0106] Transforming the above formula we get:

[0107]

[0108] 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 and lowest points on the inner surface of the pot) is increased, if the power of the pot remains unchanged, the heat transfer distance needs to be increased.

[0109] For this embodiment, Fig.13As shown, the low magnetic permeability metal matrix 10 has a first thickness d1 and a first thermal conductivity λ1. The local high magnetic permeability 20 has a second thickness d2 and a second thermal conductivity λ2. There is a maximum temperature difference ΔT in the local temperature difference area, 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 first thermal conductivity λ1, the second thermal conductivity λ2, the first thickness d1, the second thickness d2, the maximum temperature difference ΔT and the heat flux density q. Specifically, the spacing D can be related to any one, two, three or four or more of these parameters.

[0110] Select a temperature point T1 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; select two temperature points T2 and T3 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 the highest temperature point T2 is L1, and the heat transfer distance from the temperature point T1 to the lowest temperature point T3 is L2, where L1 = d = d1 + d2.

[0111] The formula for the maximum temperature difference ΔT is

[0112]

[0113] 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.

[0114] Substituting the range of ΔT into formula (3), we obtain:

[0115]

[0116] Transformed into:

[0117]

[0118] Depend on Fig.13 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 , substituting L1=d1+d2 into the transformation, we get:

[0119]

[0120] Therefore, the spacing D is related to the first thermal conductivity λ1, the second thermal conductivity λ2, the first thickness d1, the second thickness d2, the maximum temperature difference ΔT and the heat flux q, and needs to satisfy the above-mentioned relationship equations (5) and (6). It can be seen that when the thermal conductivity λ of the low magnetic permeability metal 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℃.

[0121] For a general pot inner shell, the first thermal conductivity λ1 is different depending on the material of the low magnetic permeability metal substrate, and the second thermal conductivity λ2 is different depending on the material of the local high magnetic permeability. For the low magnetic permeability metal material and high magnetic permeability material suitable for the pot inner shell of the present application, the first thermal conductivity λ1 can be 30w / (m·k)~250w / (m·k), and the second thermal conductivity λ2 is 0.01w / (m·k)~100w / (m·k). For example, λ1 can be a suitable value such as 30w / (m·k), 50w / (m·k), 80w / (m·k), 100w / (m·k), 120w / (m·k), 150w / (m·k), 180w / (m·k), 200w / (m·k), 220w / (m·k), and 250w / (m·k); λ2 can be a suitable value such as 0.01w / (m·k), 0.1w / (m·k), 1.0w / (m·k), 5.0w / (m·k), 10w / (m·k), 20w / (m·k), 30w / (m·k), 40w / (m·k), 50w / (m·k), 60w / (m·k), 70w / (m·k), 80w / (m·k), 90w / (m·k), and 100w / (m·k). As mentioned above, the thickness d of the inner pot is generally 2mm to 10mm, wherein the first thickness d1 is 1.9mm to 8mm, and the second thickness d2 is 0.1mm to 2mm. For example, d1 can be 1.9mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc.; for example, d2 can be 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, etc. Based on the above relationship of the spacing D, the approximate range of the spacing D can be obtained, which is 7mm to 100mm.

[0122] 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.

[0123] 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 proportion of the local high permeability magnetic body 20 in the function setting area is 30% to 90%, for example, the area proportion can be any suitable proportion such as 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%. The area proportion 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.

[0124] 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 30% 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 30% to 90%.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] Figure 8It 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 magnetic metal 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.

[0130] 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 7mm to 35mm, and preferably the spacing D is 20mm to 40mm, so that a significant heat convection effect can be achieved.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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 2 The spacing 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.

[0136] 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.

[0137] According to Fourier's law of heat conduction, the temperature difference generated in the pot during cooking is also related to the heating power. Therefore, the utility model 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 cooking type such as cooking porridge and rice.

[0138] Fig.11 The figure schematically shows the change of power over time. Fig.11As shown, the control method includes heating the inner pot with a first preset power P1 during the water absorption process, wherein the first preset power P1 is a constant power, which can be in the range of (1 / 30-1 / 3)P.

[0139] The water absorption process uses medium and small power heating, and does not require high temperature. Try to ensure that the temperature of the pot is uniform so that the rice can absorb water evenly.

[0140] The cooking method further includes heating the pot inner body with a second preset power P2 in the heating process, wherein the second preset power P2 is equal to the maximum power P, or close to the maximum power P.

[0141] 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.

[0142] The cooking method further includes heating the pot with a third preset power P3 during the boiling process, wherein the third preset power P3 gradually decreases from the second preset power P2 as the heating time increases. Fig. 9 As shown, it gradually decreases in a linear manner, and the third preset power P3 decreases to about 1 / 3P.

[0143] The boiling process uses medium and high power. The temperature difference generated by the inner surface of the pot in different local temperature difference areas can enhance the convection of the ingredients and water in the pot, making the ingredients boil and tumble more fully. To prevent the boiling from being too intense and affecting the flatness of the rice, the power gradually decreases with the heating time. Considering that the amount of water in the pot gradually decreases during the boiling process, the convection effect is weakened, and the power can be reduced to about 1 / 3P.

[0144] The cooking method also includes heating the inner pot with a fourth preset power P4 during the rice stewing process, wherein the fourth preset power P4 is a constant power, which can be in the range of (1 / 30 to 1 / 3)P.

[0145] 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.

[0146] Experimental Testing

[0147] Preparation of pot 1, 2 and 3.

[0148] The embodiments 1, 2 and 3 all include a low-permeability metal matrix and a local high-permeability magnet. The materials and dimensions such as thickness of the low-permeability metal matrix are the same, and the materials and dimensions such as thickness and area ratio of the local high-permeability magnet are the same. The difference is that the local high-permeability magnet 20 in the embodiment 1 is arranged in a ring shape, the local high-permeability magnet 20 in the embodiment 2 is arranged in a block array, and the local high-permeability magnet 20 in the embodiment 3 is arranged in a point array.

[0149] Use control pot

[0150] A common pot with the same model as that of the pots 1, 2 and 3 is selected as a control pot. The common pot adopts a non-magnetic metal substrate, and a layer of magnetic sensitive material is evenly coated on the outer surface of the substrate.

[0151] Using the control method of this embodiment, a cooking test of cooking rice was conducted on the implementation pots 1, 2 and 3 and the control pot. The amount of water and rice added was the same, and the control conditions were the same. After the cooking was completed, the moisture deviation of the rice cooked using the implementation pots 1, 2 and 3 and the control pot was tested.

[0152] Among them, the test method for moisture deviation is:

[0153] Take a clean aluminum or glass flat weighing bottle, place it in a drying oven at 101℃~105℃, place the bottle cap on the side of the bottle, dry for 1.0h, take it out, cover it, cool it in a dryer for 0.5h, weigh it, and repeat the drying until the difference between the two masses does not exceed 2mg, which is constant weight, and record the mass m0. Open the lid immediately after the rice is cooked, and quickly follow the Fig.12 Take rice from 9 locations 1cm-2cm away from the edge of the pot, and weigh 3g-8g of rice at each location.

[0154] Place the sample in a weighing bottle and immediately cover it, weigh it accurately to obtain m1. Then place the weighing bottle with the sample in a drying oven at 101℃~105℃, with the bottle cap tilted on the side of the bottle, dry it for 2.0h~4.0h, take it out, cover it, cool it in a dryer for 0.5h, weigh it, and repeat the drying until the difference between the two masses does not exceed 2mg, which is constant weight, and record the mass m2.

[0155] Results Analysis

[0156] The test results of moisture deviation are shown in Table 1 below.

[0157] Table 1

[0158] Pot Comparison pot Implementation of the pot 1 Implementing the pot 2 Implementing the pot 3 moisture deviation 5.31％ 3.22％ 4.24％ 5.00％

[0159] As can be seen from Table 1, compared with the control pot, the moisture content of the rice cooked using the pots 1, 2 and 3 is relatively low, indicating that the convection heating is achieved by using the local temperature difference, so that the ingredients boil and tumble more fully, the rice is more uniform, and the taste is better. In addition, the moisture deviation of the pot 1 is small, so it can be inferred that the more the local high-permeability magnetic body 20 is arranged in an annular shape, the better the convection heating effect.

[0160] 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 invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0161] The present invention has been described 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 invention is not limited to the above-mentioned embodiments. According to the teachings of the present invention, more variations and modifications can be made, and these variations and modifications all fall within the scope of protection required by the present invention.

Claims

1. A pot for electromagnetic cooking, characterized in that: The pot comprises: A low magnetic permeability metal substrate, wherein the low magnetic permeability metal substrate forms a pot body having a receiving cavity; and At least one local high magnetic permeability body, the local high magnetic permeability body is arranged on the outer surface of the low magnetic permeability metal substrate, and two adjacent local high magnetic permeabilities or adjacent parts of a single local high magnetic permeability 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, In which, the low magnetic permeability metal matrix has a first thickness d1 and a first thermal conductivity λ1, the local high magnetic permeability body has a second thickness d2 and a second thermal conductivity λ2, the local temperature difference area has a maximum temperature difference ΔT, the heat flux density of the low magnetic permeability metal matrix is ​​q, and there is a spacing D between two adjacent local high magnetic permeabilities or between adjacent parts of a single local high magnetic permeability body itself, and the spacing D is related to at least one of the first thermal conductivity λ1, the second thermal conductivity λ2, the first thickness d1, the second thickness d2, the maximum temperature difference ΔT and the heat flux density q.

2. The pot according to claim 1, characterized in that: The outer surface of the pot has a temperature point T1, and the local temperature difference area has a highest temperature point T2 and a lowest temperature point T3, wherein T2 corresponds to T1 in the thickness direction, the maximum temperature difference ΔT=T2-T3, and ΔT is a°C to b°C; The heat transfer distance from the temperature point T1 to the highest temperature point T2 is L1, and the heat transfer distance from the temperature point T1 to the lowest temperature point T3 is L2, where L1 = d = d1 + d2; and The spacing D is related to the first thermal conductivity λ1, the second thermal conductivity λ2, the first thickness d1, the second thickness d2, the maximum temperature difference ΔT and the heat flux density q, and satisfies the following relationship: as well as 3. The inner pot of claim 1, characterized in that: The maximum temperature difference ΔT is 15℃~30℃, the first thermal conductivity λ1 is 30w / (m·k)~250w / (m·k), the second thermal conductivity λ2 is 0.01w / (m·k)~100w / (m·k), the first thickness d1 is 1.9mm~8mm, the second thickness d2 is 0.1mm~2mm, and the spacing D is 7mm~100mm.

4. The pot according to 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 30% to 90%.

5. The inner pot of claim 4, characterized in that: The function setting area is defined based on the 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 metal 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 magnetic permeability metal matrix and the relative magnetic permeability of the local high magnetic permeability 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 metal substrate; or The local high magnetic permeability body is embedded into the low magnetic permeability metal substrate from the outer surface of the low magnetic permeability metal substrate.

10. The inner pot according to any one of claims 1 to 8, characterized in that: The low magnetic permeability metal substrate is made of a low magnetic permeability metal material, wherein the low magnetic permeability metal material includes one of aluminum, copper, low magnetic permeability stainless steel, magnesium, and titanium; 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 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.

Images