CN113518482B - Magnetic conduction heating structure and cooking utensil - Google Patents
Magnetic conduction heating structure and cooking utensil Download PDFInfo
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- CN113518482B CN113518482B CN202110944032.7A CN202110944032A CN113518482B CN 113518482 B CN113518482 B CN 113518482B CN 202110944032 A CN202110944032 A CN 202110944032A CN 113518482 B CN113518482 B CN 113518482B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 85
- 238000010411 cooking Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 55
- 230000020169 heat generation Effects 0.000 claims abstract description 39
- 230000035699 permeability Effects 0.000 claims abstract description 8
- 238000013461 design Methods 0.000 claims abstract description 6
- 230000005284 excitation Effects 0.000 claims abstract description 5
- 239000010935 stainless steel Substances 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 11
- 229910000838 Al alloy Inorganic materials 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 230000007547 defect Effects 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 description 10
- 241000209094 Oryza Species 0.000 description 9
- 235000007164 Oryza sativa Nutrition 0.000 description 9
- 238000013178 mathematical model Methods 0.000 description 9
- 235000009566 rice Nutrition 0.000 description 9
- 235000013305 food Nutrition 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005674 electromagnetic induction Effects 0.000 description 4
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- 239000002699 waste material Substances 0.000 description 4
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- 230000002500 effect on skin Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000000956 alloy Substances 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/004—Cooking-vessels with integral electrical heating means
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
- A47J27/086—Pressure-cookers; Lids or locking devices specially adapted therefor with built-in heating means
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Abstract
The invention provides a magnetic conduction heating structure andthe cooking utensil, wherein, magnetic conduction heating structure includes two at least material layers, and two at least material layers include the vortex heat generation layer, the thickness delta of vortex heat generation layer satisfies following formula:
and is
Wherein, P is the rated power of the magnetic conduction heating structure, delta0A skin depth for the vortex heat generation layer; delta is the design thickness of the eddy current heat generating layer; a is the external surface area of the vortex heat generating layer; ρ is the density of the material of the vortex heat generating layer; c is the specific heat capacity of the material of the vortex heat generation layer; b is a constant; f is the frequency of the excitation of the magnetic conduction heating structure coil; mu.srIs the relative permeability of the eddy current heat generating layer material; mu.s0Is a vacuum magnetic conductivity; σ is the electrical conductivity of the eddy current heat generating layer material. The technical scheme of the invention overcomes the defect of low magnetic-thermal conversion efficiency of the inner pot of the electric cooker in the prior art.
Description
Technical Field
The invention relates to the technical field of cooking appliances, in particular to a magnetic conduction heating structure and a cooking appliance.
Background
The IH electric cooker is a cooking appliance for heating food by an electromagnetic induction principle, energy efficiency is an important evaluation index of basic performance of the electric cooker, and low-energy-efficiency products are gradually eliminated. Since the energy efficiency of the IH rice cooker is generally higher than that of the heating plate rice cooker, high energy efficiency products represented by the IH technology have become a major trend in the development of the rice cooker industry.
The IH electric cooker has the working principle that: the coil panel at the bottom of the pot body inputs high-frequency alternating current, the current flows through the excitation coil to generate an alternating magnetic field, the alternating magnetic field acts on the inner pot with the magnetic conduction layer, and magnetic lines of force generate induction eddy current in the inner pot to generate eddy current heat to heat food in the pot and the pot. The traditional IH rice cooker inner pot is generally compounded by magnetic conductive stainless steel and aluminum alloy, wherein the magnetic conductive stainless steel is used as a vortex heat generation layer and mainly used for generating heat in an alternating magnetic field and providing heat for the inner pot. The aluminum alloy material is used as the heat conduction layer, the heat conduction coefficient is high, and the heat conduction layer can quickly and uniformly transfer the heat generated by the magnetic conduction stainless steel layer to all positions of the inner pot.
When the inner pot is designed, if the eddy heat generation layer of the inner pot is too thin, the heat generation amount of the eddy heat generation layer is less, and the magnetic-heat conversion efficiency is lower. If the inner pot eddy current heat generation layer is too thick, the eddy current heat generation layer and the inner pot body are heated before food materials are heated, the eddy current heat generation layer can absorb a large amount of heat, heat waste is caused, the heating speed is low, the heating efficiency is low, material waste is caused, and the material cost is increased. However, the prior art lacks a design method for the high-efficiency inner-pot eddy current heat generating layer, which causes the problem that the inner-pot eddy current heat generating layer of the current electric cooker has lower magnetic-heat conversion efficiency.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect of low magnetic-thermal conversion efficiency of the eddy current heat generating layer of the inner pot of the electric rice cooker in the prior art, so as to provide a magnetic conductive heating structure with high magnetic-thermal conversion efficiency and a cooking utensil.
In order to solve the above problems, the present invention provides a magnetic conductive heating structure, comprising at least two material layers, wherein the at least two material layers comprise a vortex heat generating layer, and the thickness δ of the vortex heat generating layer satisfies the following formula:
wherein, P is the rated power of the magnetic conduction heating structure, and the unit is W; delta0The skin depth of the eddy heat generating layer is m; delta is the designed thickness of the eddy current heat generating layer, and the unit is m; a is the external surface area of the vortex heat generation layer and is expressed by m2(ii) a Rho is the density of the material of the vortex heat generation layer and has the unit of Kg/m3(ii) a c is the specific heat capacity of the material of the vortex heat generation layer, and the unit is J/(Kg DEG C);b is a constant.
The magnetic conduction heating structure delta also meets the following formula:
wherein f is the frequency of coil excitation in Hz; mu.srIs the relative magnetic permeability of the material; mu.s0Magnetic permeability in vacuum with a unit of 4 π × 107H/m; σ is the material conductivity.
The magnetic conduction heating structure has the thermal efficiency of more than or equal to 86 percent and B of 2.5 multiplied by 10-10。
The magnetic conduction heating structure at least comprises a heat conduction layer, and the eddy current heating layer is positioned on the outer side of the heat conduction layer.
According to the magnetic conduction heating structure, the eddy current heating layer is made of stainless steel, and the heat conduction layer is made of aluminum alloy and/or copper.
The thickness of the eddy current heat generating layer of the magnetic conduction heat generating structure is in the range of 0.356mm to 1.43 mm.
The thickness of the eddy current heat generating layer of the magnetic conduction heat generating structure is 0.61 mm.
The magnetic conduction heating structure is a cooker.
The invention also provides a cooking appliance which comprises the magnetic conduction heating structure.
The cooking appliance is an electric cooker or an electric pressure cooker, and comprises a pot body and a pot cover covered on the pot body, wherein the bottom of the pot body is provided with a coil panel, the cooking appliance also comprises an inner pot, the inner pot is placed in the pot body and positioned above the coil panel, and the inner pot forms a magnetic conduction heating structure.
The invention has the following advantages:
by utilizing the technical scheme of the invention, the material thickness, the material characteristics and the heating efficiency of the eddy current heat-generating layers with different magnetic conduction heating structures are recorded and tested, and a mathematical model of heat-generating heat energy and heat-absorbing heat energy is established. When the magnetic conduction heating structure is designed, a target electromagnetic heating efficiency corresponding constant B to be designed and material characteristics are substituted into a mathematical model of heat generation energy and heat absorption energy, so that the material thickness of the eddy current heating layer of the magnetic conduction heating structure meeting the target electromagnetic heating efficiency can be designed, the eddy current heating layer of the magnetic conduction heating structure is ensured to have higher magnetic-thermal conversion efficiency, the material waste and the heat loss are reduced, and the magnetic conduction heating structure is ensured to have higher heating efficiency. Meanwhile, the material thickness of the eddy current heat generation layer of the magnetic conduction heating structure is designed through the mathematical model of heat generation heat energy and heat absorption heat energy, and the method has the characteristics of fast design and high efficiency. Therefore, the technical scheme of the invention overcomes the defect of low magnetocaloric conversion rate of the inner pot eddy current heat generating layer of the electric cooker in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 shows a schematic structural view of the inner pan of the present invention;
FIG. 2 shows an enlarged schematic view at C of FIG. 1;
FIG. 3 is a schematic heat diagram of the eddy current heat generating layers of different thicknesses of the magnetically conductive heat generating structure of the present invention;
fig. 4 shows a schematic thermal efficiency diagram of eddy current heat generation layers with different thicknesses of the magnetic conductive heat generation structure of the present invention.
Description of reference numerals:
10. a vortex heat generating layer; 20. a heat conductive layer; 100. an inner pot.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 to fig. 2, the present embodiment provides a magnetic conductive heat generating structure, which at least includes a vortex heat generating layer 10, and a thickness δ of the vortex heat generating layer 10 satisfies the following formula:
wherein, P is the rated power of the magnetic conduction heating structure, and the unit is W; delta0Is the skin depth of the vortex heat generating layer 10, and is expressed in m; δ is the design thickness of the vortex heat generating layer 10, and the unit is m; a is the external surface area of the vortex heat generating layer 10 and is expressed by m2(ii) a Rho is the density of the material of the eddy heat-generating layer 10 and has the unit of Kg/m3(ii) a c is the specific heat capacity of the material of the vortex heat generation layer 10, and the unit isJ/(Kg. DEG C); b is a constant. The main function of the eddy current heat generating layer 10 is to generate heat in an alternating magnetic field.
The material thickness, material characteristics and heating efficiency of the eddy current heat-generating layers 10 of different magnetic conduction heat-generating structures are recorded and tested, and a mathematical model of heat generation energy and heat absorption energy is established. When the magnetic conduction heating structure is designed, the constant B corresponding to the heating efficiency of the target magnetic conduction heating structure to be designed and the material characteristics are substituted into the mathematical model of heat generation energy and heat absorption energy, so that the material thickness of the eddy current heating layer 10 meeting the heating efficiency of the target magnetic conduction heating structure can be designed, the eddy current heating layer 10 of the magnetic conduction heating structure is ensured to have higher magnetic heat conversion efficiency, the material waste and the heat loss are reduced, and the magnetic conduction heating structure is ensured to have higher heating efficiency. Meanwhile, the material thickness of the eddy current heat generation layer 10 of the magnetic conduction heating structure is designed through a mathematical model of heat generation heat energy and heat absorption heat energy, and the method has the characteristics of fast design and high efficiency. Therefore, the technical scheme of the invention solves the defect of low magnetocaloric conversion rate of the inner pot 100 eddy current heat generating layer 10 of the electric cooker in the prior art.
The material properties of the eddy current heat generating layer 10 of the magnetic conductive heat generating structure refer to relative magnetic permeability, electric conductivity, thermal conductivity, density, specific heat capacity, and the like of the eddy current heat generating layer 10. The material thickness, the material characteristics and the heating efficiency of the eddy current heat generation layer 10 with different magnetic conduction heating structures are tested, and the test data results are subjected to function fitting, so that a mathematical model of heat generation energy and heat absorption energy of the eddy current heat generation layer 10 with the magnetic conduction heating structure can be obtained. The mathematical model of the heat generating and absorbing heat of the eddy heat generating layer 10 comprises
Those skilled in the art will understand that the structure for heating by electromagnetic induction can be used as a magnetic conductive heating structure, for example, the magnetic conductive heating structure can be an inner pot 100 of an IH electric rice cooker or an electric pressure cooker, or a pot for an electromagnetic oven, an electromagnetic hot pot, a heat conducting component of a wall hanging electromagnetic oven, a heat conducting component of an electromagnetic heating mold, and so on. For convenience of explanation, the present embodiment is described below with reference to the inner pan 100, and it is understood by those skilled in the art that the technical contents described in the following embodiments can be fully applied to the various electromagnetic heating components exemplified above.
The mathematical model of the heat generating heat energy and the heat absorbing heat energy of the eddy current heat generating layer 10 is obtained by the following formula:
basic equation of magnetic field intensity distribution:
equivalent current equation:
and the equivalent power equation:
wherein, IrIs the current density value at a depth x from the outer surface; i is0Is the current density value of the outer surface; x is the distance from the outer surface to the measurement point; delta0Is the skin depth of the eddy currents. Due to the skin effect, the eddy current density induced by the eddy current heat generating layer 10 in the alternating magnetic field is not uniformly distributed, the eddy current density of the eddy current heat generating layer 10 near the outer surface of the structure generating the alternating magnetic field is large, and the eddy current gradually decreases as the distance from the outer surface is farther. The eddy current and the eddy power are mainly concentrated on the outer surface of the eddy heat generating layer 10, the eddy current and the eddy power are reduced in an exponential rule along with the increase of the distance between the eddy heat generating layer 10 and the outer surface, and 87.5 percent of the eddy energy is generated at a position delta from the surface0Within the thickness of (a).
The above three formulas are all conventional theoretical formulas, and those skilled in the art can understand the specific meanings and calculation methods thereof, so that the detailed description is omitted.
In the magnetic conduction heating structure in this embodiment, δ further satisfies the following formula:
wherein f is the frequency of coil excitation in Hz; mu.srIs the relative magnetic permeability of the material; mu.s0Magnetic permeability in vacuum with a unit of 4 π × 107H/m; σ is the material conductivity. According to the skin effect, the magnetic conduction heating structure also meets the condition that delta is more than or equal to delta0(ii) a Wherein,
as shown in fig. 3 and 4, when the thickness of the vortex heat generating layer 10 is increased from the skin depth to a certain thickness, the thickness of the vortex heat generating layer 10 is further increased, the induced vortex heat generation amount of the vortex heat generating layer 10 is not substantially increased, the heat absorption amount of the inner pot 100 is linearly increased all the time, the heat absorption amount is larger and larger, and the heat loss of the vortex heat generating layer 10 is increased all the time, so that the difference between the heat generation amount and the heat absorption amount of the vortex heat generating layer 10 is the largest when the thickness of the vortex heat generating layer 10 is a certain thickness, at this time, the thermal efficiency of the vortex heat generating layer 10 is the highest, and the thermal efficiency of the corresponding magnetic conductive heat generating structure is the highest.
The above formula, the relevant parameters of the different eddy current heat generation layers 10, the induction heating simulation calculation of the inner pot 100, the heat schematic diagram of the eddy current heat generation layers 10 with different thicknesses shown in fig. 3, and the heat efficiency schematic diagram of the eddy current heat generation layers 10 with different thicknesses shown in fig. 4 are obtained through theoretical derivation, simulation and experimental data analysis, the influence rule of heat generation energy and heat absorption energy of the eddy current heat generation layers 10 is obtained, the thickness calculation function of the eddy current heat generation layers 10 of the magnetic conduction heating structure such as the inner pot 100 is fitted, and the efficient heating of the magnetic conduction heating structure is realized.
The applicant obtains a large amount of data through simulation calculation, analyzes the relationship among physical property parameters, structural parameters, magnetic-thermal conversion efficiency and heating efficiency of the eddy heat generation layer 10 of the inner pot 100 based on simulation data, fits the functions of material density, specific heat capacity, heat conductivity coefficient, thickness and magnetic-thermal conversion efficiency and equivalent heating efficiency of the eddy heat generation layer 10, and verifies the functions through energy efficiency test experiments of the national standard electric cooker. The larger the ratio of the heat generating energy to the heat absorbing energy of the eddy heat generating layer 10 is, the higher the heating efficiency of the inner pot 100 is, i.e. the higher the thermal efficiency of the IH rice cooker is.
For example, in the present embodiment, when the target heating efficiency is 86%, the corresponding constant B is 2.5 × 10-10。
Preferably, the above parameter B is 2.5X 10 when the target heating efficiency is the highest-8. Of course, the person skilled in the art can adjust the parameter B according to the fitting result of the experimental data.
As shown in fig. 1 and fig. 2, the magnetic conductive heat generating structure in the present embodiment further includes at least a heat conductive layer 20, and the eddy current heat generating layer 10 is located outside the heat conductive layer 20. The heat conducting layer 20 has a high thermal conductivity and is used for rapidly and uniformly transferring the heat generated by the eddy current heat generating layer 10 to the magnetic conductive heat generating structure such as the inner pot 100.
In this embodiment, the eddy current heat generating layer 10 is made of stainless steel, and the heat conducting layer 20 is made of aluminum alloy, wherein the thickness of the eddy current heat generating layer 10 is obtained by the above-mentioned ratio model of heat generating energy to heat absorbing energy and the skin depth. In order to generate heat by induced eddy current, a heating heat source is provided for the IH electric cooker, and the outermost layer of the inner cooker 100 must be made of magnetic conductive stainless steel material.
Alternatively, the eddy current heat generating layer 10 may be made of stainless steel and the heat conductive layer 20 may be made of copper.
As an alternative embodiment, the material layers may include a first material layer, a second material layer, and a third material layer, which are sequentially disposed from the outside to the inside, the first material layer being the eddy current heat generating layer 10 made of stainless steel, the second material layer being made of an aluminum alloy, and the third material layer being made of copper.
In a specific embodiment of this embodiment, when the thermal efficiency of the magnetic conduction heating structure is greater than 86%, the constant B is 2.5 × 10-10That is, the thickness of the eddy current heat generating layer 10 satisfies the following two formulas at the same time:
the thickness of the eddy current heat generating layer 10 of the magnetic conduction heat generating structure such as the inner pot 100 is calculated according to the two formulas and is in the range of 0.356mm to 1.43 mm.
In this example, the constant B is 2.5X 10-8Meanwhile, the magnetic-thermal conversion efficiency of electromagnetic induction heating is close to the highest value, the thermal efficiency of magnetic conduction heating structures such as IH electric cookers is close to the highest value, and at the moment, the thickness of the eddy current heating layer 10 meets the following formula:
the optimum thickness of the heat generating layer 10 is for the eddy current. In the present embodiment, the optimum thickness of the vortex heat generating layer 10 is 0.61 mm.
In this embodiment, the eddy current heat generating layer 10 is generally made of a magnetic conductive stainless steel material, a high-frequency alternating current is introduced into the coil of the IH electric cooker to generate an alternating magnetic field in a space around the coil, and the magnetic conductive stainless steel layer generates an induced eddy current in the alternating magnetic field, and the induced eddy current generates heat as a heat source for the IH electric cooker to heat the inner pot 100 and the food materials in the inner pot 100. The heat conducting layer 20 is generally made of high heat conducting materials such as aluminum alloy and copper, and is used for conducting heat generated by the heat generating layer to the whole inner pot 100, so that the whole body of the inner pot 100 is heated up rapidly, the average pot body temperature of the inner pot 100 is increased, the heat exchange performance between the inner pot 100 and food materials in the pot is enhanced, and the heating efficiency is improved.
The 100 magnetic conduction stainless steel layers of pot in the IH electric rice cooker induce the eddy current to produce heat, the heat is conducted to the whole 100 pot bodies of the inner pot through the heat conduction layer 20, so that the whole body of the inner pot 100 pot is heated up rapidly, the average temperature of the inner pot 100 pot body is improved, the temperature difference between the inner pot 100 pot body and the inner pot food is increased, the heat exchange performance between the inner pot 100 pot and the inner pot food is enhanced, and the heating efficiency is further improved.
The speed of heat transfer of heat in the inner pot 100 mainly depends on the heat conductivity coefficient and the material thickness of the material of the inner pot 100, the larger the heat conductivity coefficient and the thickness of the inner pot 100 are, the faster the heat transfer speed in the pot body is, and the more uniform the temperature of the inner pot 100 is; the temperature rising speed of the inner pot 100 mainly depends on the specific heat capacity, the density and the thickness of the material, the smaller the specific heat capacity, the smaller the density and the smaller the thickness of the material are, the faster the temperature rising speed of the inner pot 100 is, the larger the temperature difference between the inner pot 100 and the food material in the pot is, the faster the heat exchange speed is, and the higher the heating efficiency is.
In this embodiment, the magnetic conductive heating structure is a pot, preferably an inner pot 100 of a cooking appliance.
The embodiment also provides a cooking appliance, which comprises the magnetic conduction heating structure.
The cooking utensil is electric rice cooker or electric pressure cooker, and the cooking utensil includes the pot body and covers the pot cover of establishing on the pot body, and the bottom of the pot body is provided with the coil panel, and the cooking utensil still includes interior pot 100, and interior pot 100 is placed in the pot body and is located the top of coil panel, and interior pot 100 forms the magnetic conduction heating structure.
Of course, the cooking appliance may be other cooking appliances that perform heating by electromagnetic induction.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A magnetic conductive heat generating structure, characterized by comprising at least a vortex heat generating layer (10), wherein a thickness δ of the vortex heat generating layer (10) satisfies the following formula:
wherein, P is the rated power of the magnetic conduction heating structure, and the unit is W; delta0Is the skin depth of the vortex heat generating layer (10) and has the unit of m; delta is the design thickness of the eddy current heat generating layer (10) and the unit is m; a is the external surface area of the vortex heat generating layer (10) and the unit is m2(ii) a Rho is the density of the material of the eddy heat-generating layer (10) and has the unit of Kg/m3(ii) a c is the specific heat capacity of the material of the vortex heat-generating layer (10), and the unit is J/(Kg ℃); b is a constant.
2. A magnetic conduction heating structure as claimed in claim 1, wherein δ further satisfies the following formula:
wherein f is the frequency of coil excitation in Hz; mu.srIs the relative magnetic permeability of the material; mu.s0Magnetic permeability in vacuum with a unit of 4 π × 107H/m; σ is the material conductivity.
3. A magnetically conductive heating structure as claimed in claim 1, wherein when the thermal efficiency of the magnetically conductive heating structure is greater than or equal to 86%, B is 2.5 x 10-10。
4. A magnetic and heat conducting structure according to any one of claims 1 to 3, further comprising at least a heat conducting layer (20), wherein the eddy current heat generating layer (10) is located outside the heat conducting layer (20).
5. A magnetically conductive heating structure according to claim 4, wherein the eddy current heat generating layer (10) is made of stainless steel and the heat conducting layer (20) is made of aluminum alloy and/or copper.
6. A magnetically permeable, heat generating structure according to claim 4, wherein the thickness of the eddy current heat generating layer (10) is in the range of 0.356mm to 1.43 mm.
7. A magnetically permeable, heat generating structure according to claim 6, wherein the thickness of the eddy current heat generating layer (10) is 0.61 mm.
8. A magnetic conduction and heat generation structure as claimed in any one of claims 1 to 3 and 5 to 7, wherein the magnetic conduction and heat generation structure is a pot.
9. A cooking appliance comprising a magnetically conductive heat generating structure according to any one of claims 1 to 8.
10. The cooking appliance according to claim 9, wherein the cooking appliance is an electric cooker or an electric pressure cooker, the cooking appliance comprises a pot body and a pot cover covering the pot body, a coil panel is arranged at the bottom of the pot body, the cooking appliance further comprises an inner pot (100), the inner pot (100) is placed in the pot body and positioned above the coil panel, and the inner pot (100) forms the magnetic conductive heating structure.
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