Cooking apparatus

Abstract

This invention provides a cooking device, relating to the field of household appliance technology. The cooking device includes a control panel; a coil for generating an alternating magnetic field; and a non-magnetic conductor, which is disposed on the side of the control panel facing the coil, or on the side of the control panel away from the coil, and is configured to generate heat in the alternating magnetic field. The cooking device provided by this invention is applicable to cookware made of different materials, exhibiting high applicability.

Description

[0001] This application claims priority to Chinese Patent Application No. 202510210015.9, filed on February 24, 2025, entitled "A Cooking Apparatus", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of household appliance technology, and more particularly to a cooking device. Background Technology

[0003] An induction cooker is a common cooking appliance with advantages such as high heating efficiency, fast heating speed, and safe use of electric heating.

[0004] In the existing technology, an induction cooker has a panel and a coil. When the coil is energized, it can generate an alternating magnetic field. When an iron pot with magnetic properties is placed on the panel, the alternating magnetic field can cut the pot, thereby generating an alternating current (i.e., eddy current) at the bottom of the pot, causing the pot to heat up on its own to heat the food.

[0005] However, conventional induction cookers can only heat cookware made of magnetic materials; they cannot heat cookware made of other materials, such as ceramic pots and earthenware pots. Summary of the Invention

[0006] In view of the above problems, embodiments of the present invention provide a cooking device that can heat both magnetic and non-magnetic cookware, and has high applicability.

[0007] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0008] This invention provides a cooking device, comprising:

[0009] panel;

[0010] Coil disk, used to generate alternating magnetic fields;

[0011] A non-magnetic conductor is disposed on the side of the panel facing the coil disk, or the non-magnetic conductor is disposed on the side of the panel away from the coil disk, and the non-magnetic conductor is configured to generate heat in the alternating magnetic field.

[0012] The thickness of the non-magnetic conductor satisfies the following relationship:

[0013] ,

[0014] ,

[0015] Where H is the thickness of the non-magnetic conductor (mm), δ is the skin depth (mm), ω is the angular frequency of the alternating magnetic field (rad / s), σ is the conductivity of the non-magnetic conductor (S / m), and μ is the permeability of the non-magnetic conductor (H / m).

[0016] Thus, when the thickness H of the non-magnetic conductor meets certain conditions, it can be partially heated by an alternating magnetic field. This alternating magnetic field can also pass through the non-magnetic conductor. When using a magnetic cookware, the alternating magnetic field can pass through the non-magnetic conductor and act directly on the cookware, generating an alternating current and causing it to heat up rapidly. Furthermore, because the non-magnetic conductor can induce heat in the alternating magnetic field, it can conduct heat outwards, for example, towards the cookware, thus heating it. Therefore, whether using magnetic or non-magnetic cookware, the cookware can be heated via the control panel, making this cooking equipment highly versatile.

[0017] In some embodiments, the coil includes a coil, and the projection of the non-magnetic conductor on the panel at least partially overlaps with the projection of the coil on the panel. This allows the alternating magnetic field to act on the non-magnetic conductor as much as possible, reducing magnetic field leakage and improving the heating efficiency of the cooking equipment.

[0018] In some embodiments, the coil disk includes a coil and a magnetic element, the coil being disposed between the panel and the magnetic element;

[0019] The first end of the magnetic element is bent and extends toward one side of the panel and surrounds the outside of the coil, and the gap between the first end of the magnetic element and the panel is less than or equal to the thickness of the non-magnetic conductor.

[0020] This allows the alternating magnetic field to act more concentratedly on the non-magnetic conductor, which helps to make the induced heat generated in various parts of the non-magnetic conductor more uniform, and also allows the alternating magnetic field to act more concentratedly on the cookware.

[0021] In some embodiments, the coil is ring-shaped, and the second end of the magnetic element is bent and extended toward one side of the panel, with the coil wrapping around the outside of the second end of the magnetic element.

[0022] This allows for lower attenuation loss of the alternating magnetic field during conduction, enabling the alternating magnetic field to exert more energy on the cookware and non-magnetic conductors, thereby improving the heating efficiency of the cooking equipment.

[0023] In some embodiments, the non-magnetic conductor is attached to the inner wall surface of the panel facing the coil disk. This improves the thermal conductivity between the non-magnetic conductor and the panel, reducing heat loss.

[0024] In some embodiments, the non-magnetic conductor is applied to the outer wall surface of the panel opposite to the coil by spraying or melting. This allows the heat generated by the non-magnetic conductor to be directly transferred to the cookware, reducing heat loss during conduction and improving heat transfer efficiency.

[0025] In some embodiments, the cooking device further includes a heat insulation element disposed between the non-magnetic conductor and the coil. This reduces the heat conducted away from the panel by the non-magnetic conductor, allowing more heat to be conducted towards the panel, resulting in higher heating efficiency of the panel.

[0026] In some embodiments, the heat insulation member is provided with a receiving groove, the opening of which faces the panel, and the non-magnetic conductor is disposed within the receiving groove. This reduces the amount of heat conducted by the non-magnetic conductor toward the side away from the panel and toward the direction parallel to the panel, allowing more heat to be conducted toward the panel, resulting in higher heating efficiency for the panel.

[0027] In some embodiments, the panel covers the opening of the receiving groove. This reduces heat loss at the opening of the receiving groove, allowing more heat to be conducted towards one side of the panel, resulting in higher heating efficiency of the panel.

[0028] In some embodiments, a heat-insulating gap is provided between the heat insulation element and the coil of the coil disk. This reduces the heat conducted from the heat insulation element toward the coil disk and facilitates heat dissipation and cooling of both the heat insulation element and the coil disk through the heat-insulating gap.

[0029] In some embodiments, the material of the non-magnetic conductor is at least one selected from titanium, graphite, graphene, aluminum, and copper. Thus, the non-magnetic conductor has no magnetic permeability or poor magnetic permeability, allowing the alternating magnetic field to pass through it and act directly on the cookware. Furthermore, the non-magnetic conductor can have good conductivity, generating more eddy currents and heat in the alternating magnetic field.

[0030] In some embodiments, the non-magnetic conductor is made of graphite, and its thickness is 0.5mm-20mm. This allows graphite to generate more induced heat and conduct more heat through the cookware.

[0031] In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems that the cooking equipment provided by the embodiments of the present invention can solve, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific embodiments. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the cooking equipment provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the exploded structure of a cooking device provided in an embodiment of the present invention;

[0035] Figure 3 This is another structural schematic diagram of the cooking device provided in an embodiment of the present invention;

[0036] Figure 4 A cross-sectional view of the coil and non-magnetic conductor in the cooking device provided in an embodiment of the present invention;

[0037] Figure 5 This is a cross-sectional view of the cooking equipment provided in an embodiment of the present invention.

[0038] Figure label:

[0039] 1-Cooking equipment;

[0040] 10-panel;

[0041] 20-coil;

[0042] 30 - Non-magnetic conductor;

[0043] 40 - Thermal insulation component; 41 - Receiving groove;

[0044] 50-Coil bracket;

[0045] 60 - Magnetic component; 61 - Body section; 62 - First bending section; 63 - Second bending section;

[0046] 70 - Housing; 71 - Receiving cavity;

[0047] M - Thermal insulation gap;

[0048] 2-Cookware. Detailed Implementation

[0049] To make the above-mentioned objectives, features, and advantages of the embodiments of the present invention more apparent and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] An induction cooker is a commonly used cooking appliance. Unlike traditional open-flame stoves, it has the advantages of high heating efficiency, fast heating speed, and safe electric heating.

[0051] In related technologies, induction cookers contain a coil. When the coil is energized, it generates an alternating magnetic field. According to the principle of electromagnetic induction, when a magnetic cookware is placed on the induction cooker, the alternating magnetic field cuts through the cookware, thereby generating an alternating current (eddy current) at the bottom of the cookware, causing the cookware to heat up and cook the food.

[0052] In other words, based on the working principle of induction cookers, they are generally only suitable for cookware with magnetic properties, such as iron pots or other alloy pots containing magnetic components (iron, cobalt, nickel and their alloys), and not suitable for cookware with non-magnetic properties or poor magnetic properties, such as ceramic pots, earthenware pots, glass pots, aluminum pots, copper pots, etc. In other words, induction cookers cannot heat cookware with non-magnetic properties or poor magnetic properties, and their applicability is relatively poor.

[0053] In view of this, this application provides a cooking device with a coil and a non-magnetic conductor. When the coil is energized, it generates an alternating magnetic field. The non-magnetic conductor is a conductor that is not magnetic or has poor magnetic permeability; specifically, it is a conductor that does not contain ferromagnetic elements (iron, cobalt, nickel), such as titanium, graphite, graphene, aluminum, and copper. The inventors have discovered that when the thickness of the non-magnetic conductor is less than or equal to three times its skin depth in a magnetic field, the non-magnetic conductor can be partially heated by the alternating magnetic field, and part of the alternating magnetic field can pass through the non-magnetic conductor. Therefore, when a magnetic cookware is placed on the cooking device, the alternating magnetic field can directly act on the cookware, generating an alternating current at the bottom of the cookware, causing it to heat up. Simultaneously, the non-magnetic conductor can also induced heat in the alternating magnetic field, thus conducting heat to the outside, for example, through the control panel to the cookware. When non-magnetic cookware is placed on the cooking equipment, the non-magnetic conductor is induced to heat in the alternating magnetic field, and the heat is conducted to the outside of the non-magnetic conductor, such as to the cookware, thus heating different types of cookware. In this way, the cooking equipment can heat both magnetic and non-magnetic cookware, making it highly versatile.

[0054] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments.

[0055] Please see Figures 1 to 5 This embodiment provides a cooking device 1, which can heat a pot 2, thereby heating food. The cooking device 1 can be an induction cooker, an induction stove, a built-in induction stove, etc. This embodiment does not limit the specific form of the cooking device 1; for ease of explanation, an induction cooker will be used as an example for the following description.

[0056] In some embodiments, the cooking device 1 may include a panel 10 and a housing 70, the panel 10 being used to support the pot 2, and the housing 70 being connected to the panel 10 and forming a receiving cavity 71.

[0057] In some embodiments, panel 10 may be a microcrystalline panel, a black crystal panel, a tempered glass panel, etc. Alternatively, panel 10 may be a composite panel composed of multiple panels; for example, panel 10 is a composite panel consisting of a microcrystalline panel and a stainless steel plate. In some embodiments, the thickness of panel 10 may be 3mm-6mm; this embodiment does not limit the type and thickness of panel 10.

[0058] In some embodiments, panel 10 may be a flat panel, a panel recessed towards the inside of the receiving cavity, or a panel of other shapes. This embodiment does not limit the shape of panel 10; for ease of explanation, panel 10 will be described as a flat panel below.

[0059] In some embodiments, the cooking device 1 further includes a control component (not shown) and a coil plate, both of which are disposed within the accommodating cavity 71. The control component may include a circuit board electrically connected to the coil plate to control the coil plate to generate an alternating magnetic field.

[0060] Thus, when heating food using a magnetic cookware 2, such as an iron pot, stainless steel pot, or other magnetic cookware, the cookware 2 can be placed on the control panel 10. After the cooking device 1 is powered on, the circuit board can control the coil to generate an alternating magnetic field. Since the control panel 10 is not magnetic or has poor magnetic permeability and is relatively thin, its influence on the conduction of the alternating magnetic field is minimal. Therefore, the alternating magnetic field can pass through the control panel 10 with minimal attenuation loss and act on the cookware 2, inducing eddy currents within the cookware 2. Because the cookware 2 has resistance, according to Joule's law, the eddy currents flowing within the cookware 2 are converted into heat energy, i.e., the cookware 2 generates induced heat, causing it to heat up. In other words, the cooking device 1 can use a magnetic cookware 2 to heat food.

[0061] In some embodiments, the coil disk may include a coil 20 and a coil support 50. The coil 20 is disposed on the coil support 50. The coil support 50 may be integrally formed with the housing 70, or it may be installed and fixed in the housing 70 by means of snap-fit, screw connection or other methods. This embodiment does not limit the scope of the invention.

[0062] In some embodiments, the coil disk may also include a magnetic element 60, such as a ferrite magnetic element, and the coil 20 is disposed between the panel 10 and the magnetic element 60, that is, the panel 10 and the magnetic element 60 are located on opposite sides of the coil.

[0063] In some embodiments, an insulating structure (not shown) is provided between the magnetic element 60 and the coil 20, such as an insulating pad or an insulating coating on the surface of the magnetic element 60, to prevent electric sparks from occurring between the magnetic element 60 and the coil 20 and to prevent the coil 20 from being broken down. This embodiment does not limit the insulating structure between the magnetic element 60 and the coil 20.

[0064] Understandably, the coil can generate an alternating magnetic field along the thickness of the panel 10 and diffuse it outwards. The magnetic component 60 is magnetically conductive, and a magnetic channel can be formed within the magnetic component 60 to change the direction of the alternating magnetic field, guiding it to the position of the panel 10. On the one hand, this helps the cookware 2 to heat up more quickly, increasing the heating speed of the cookware 2. On the other hand, it can also reduce magnetic leakage of the alternating magnetic field in other directions (the bottom of the cooking device 1 and the circumferential sides of the cooking device 1), protecting the safety of the user and the control components.

[0065] In some embodiments, the cooking device 1 further includes a non-magnetic conductor 30 through which an alternating magnetic field can pass.

[0066] Understandably, components that can be passed through by an alternating magnetic field refer to those that do not generate significant heat due to eddy current effects or hysteresis losses within the alternating magnetic field. Their permeability can approach the vacuum permeability μ0 = 4π × 10⁻⁶. -7 H / m. It is understood that for components with a permeability slightly greater than that of vacuum, the material can be, for example, ferritic stainless steel, nickel-copper alloy, etc. The permeability of such components can be in the range of 1.01μ0-5μ0. Since the attenuation loss caused by the alternating magnetic field passing through such material components is small, such components can also be considered to belong to the category of "subject to magnetic field passage" described in this embodiment.

[0067] In other words, the non-magnetic conductor 30 has no magnetic permeability or poor magnetic permeability, and its influence on the conduction of the alternating magnetic field is small. Thus, when a cookware 2 with magnetic permeability is used, the alternating magnetic field can pass through the non-magnetic conductor 30 and the panel 10 in sequence with a small attenuation loss and act on the cookware 2.

[0068] In some embodiments, the non-magnetic conductor 30 also exhibits electrical conductivity. According to the skin effect, when the coil 20 generates an alternating magnetic field, and the non-magnetic conductor 30 is situated within this field, eddy currents can be induced within it. These eddy currents are alternating currents and typically accumulate near the surface of the non-magnetic conductor 30 and flow there. Since the non-magnetic conductor 30 has resistance, according to Joule's law, the eddy currents flowing within it are converted into heat energy; that is, the non-magnetic conductor 30 can generate heat in an alternating magnetic field.

[0069] In other words, the non-magnetic conductor 30 can generate heat in an alternating magnetic field. In this way, the heat generated by the non-magnetic conductor 30 can be conducted to its surroundings. For example, some of the heat can be conducted in a direction parallel to the panel 10.

[0070] In some embodiments, the non-magnetic conductor 30 may be disposed on the side of the panel 10 facing the coil disk. In this way, both the coil 20 and the non-magnetic conductor 30 are located on the side of the coil support 50 near the panel 10, that is, the coil 20 is mounted on the coil support 50, and the non-magnetic conductor 30 is disposed on the side of the coil 20 facing the panel 10.

[0071] In this way, some of the heat generated by the non-magnetic conductor 30 can also be conducted to one side of the panel 10 to conduct heat to the panel 10. After the panel 10 absorbs heat, its temperature rises. When food is heated using a cookware 2, such as a magnetic cookware 2 or a non-magnetic cookware 2, after the cookware 2 is placed on the panel 10, the heat on the panel 10 can be conducted to the cookware 2 through thermal conduction and thermal radiation, causing the cookware 2 to heat up.

[0072] In some embodiments, the non-magnetic conductor 30 may be disposed on the side of the panel 10 away from the coil, that is, the non-magnetic conductor 30 may be disposed on the wall surface of the panel 10 that supports the pot 2.

[0073] In this way, when using the cookware 2 to heat food, whether it is a magnetic cookware 2 or a non-magnetic cookware 2, after the cookware 2 is placed on the panel 10, the cookware 2 is in direct contact with the non-magnetic conductor 30. The heat on the non-magnetic conductor 30 can be directly conducted to the cookware 2 through heat conduction, so that the cookware 2 heats up and the heat conduction efficiency is high.

[0074] In some embodiments, a non-magnetic conductor 30 may be provided on both the side of the panel 10 facing the cookware and the side of the panel 10 facing the coil. This embodiment does not limit the placement of the non-magnetic conductor 30.

[0075] In other words, the cooking device 1 provided in this embodiment can heat a pot 2 with magnetic properties, including but not limited to iron pots, stainless steel pots, cast iron pots, or other magnetic pots 2. It can also heat a pot 2 without magnetic properties, including but not limited to casserole, ceramic pots, glass pots, aluminum pots, and copper pots. The cooking device 1 has a wide range of applications.

[0076] Furthermore, the cooking device 1 provided in this embodiment does not require the control component to detect and identify the type of cookware 2. As long as the cookware 2 is placed on the panel 10, the cooking device 1 can heat the cookware 2 after being powered on, which simplifies the control component and the structure of the cooking device 1.

[0077] In some embodiments, when using a magnetic cookware 2, the heat source on the cookware 2 can be obtained through various means, including heat generated by the alternating magnetic field acting directly on the cookware 2, heat transferred to the cookware 2 by the panel 10 or the non-magnetic conductor 30 through heat conduction and heat radiation, etc. Compared with heating the magnetic cookware 2 using the coil 20 alone, the cooking device 1 provided in this embodiment can enable the magnetic cookware 2 to obtain more heat and has higher heating efficiency.

[0078] The following examples illustrate the materials of the non-magnetic conductor 30, and do not constitute a limitation on the materials of the non-magnetic conductor 30, as long as they are conductive and not magnetic or have poor magnetic permeability.

[0079] In some embodiments, the material of the non-magnetic conductor 30 can be a metal, such as titanium (Ti), aluminum (Al), copper (Cu), silver (Ag), gold (Au), zinc (Zn), tin (Sn), copper-zinc alloy, copper-tin alloy, etc.

[0080] In some embodiments, the material of the non-magnetic conductor 30 can be a polymer material, which can be a composite polymer material with added conductive filler. The conductive filler can be a carbon-based filler, such as graphite-filled polyethylene, carbon nanotube-reinforced epoxy resin, conductive carbon black-modified polyurethane, etc. The conductive filler can also be a metal oxide filler, such as indium tin oxide powder-filled silicone rubber, aluminum-doped zinc oxide particles-modified polypropylene.

[0081] In some embodiments, the material of the non-magnetic conductor 30 can be a semiconductor material, such as gallium arsenide (GaAs), silicon carbide (SiC), gallium nitride (GaN), or other compound semiconductors.

[0082] In some embodiments, the material of the non-magnetic conductor 30 may also be graphite, graphene, etc.

[0083] In some embodiments, when the material of the non-magnetic conductor 30 is graphite, the graphite can undergo an anti-oxidation treatment. The anti-oxidation treatment method may include setting an anti-oxidation coating (e.g., silicon carbide coating, boron nitride coating) on ​​the graphite surface, impregnating the graphite (the impregnating agent may be phosphoric acid, boric acid, sodium silicate solution, or molten borax, phosphate), or forming an oxide film on the graphite surface by oxidation. This embodiment does not limit the anti-oxidation treatment method of graphite.

[0084] In some embodiments, the thickness of the non-magnetic conductor 30 satisfies the following relationship:

[0085] ,

[0086] ,

[0087] Where H is the thickness of the non-magnetic conductor (mm), δ is the skin depth (mm), ω is the angular frequency of the alternating magnetic field (rad / s), σ is the conductivity of the non-magnetic conductor 30 (S / m), and μ is the permeability of the non-magnetic conductor 30 (H / m).

[0088] The skin depth refers to the depth at which the current density drops to 1 / e (approximately 36.8%) of the surface area. It can be understood as the degree of concentration of eddy currents on the surface of the non-magnetic conductor 30. A smaller skin depth indicates that the eddy currents are more concentrated on the surface of the non-magnetic conductor 30. In other words, the eddy currents generated within the non-magnetic conductor 30 are mainly concentrated near its surface, and there is almost no current inside the non-magnetic conductor 30.

[0089] Therefore, when the thickness of the non-magnetic conductor 30 is too large, for example, much larger than its skin depth, the portion of the non-magnetic conductor 30 exceeding its skin depth generates fewer eddy currents and correspondingly less induced heat. Simultaneously, it absorbs the induced heat generated on the surface of the non-magnetic conductor 30, leading to heat loss. Furthermore, it increases the conduction path length of the alternating magnetic field, increasing the attenuation loss of the alternating magnetic field.

[0090] By limiting the thickness of the non-magnetic conductor 30 to less than 3 times the skin depth, the non-magnetic conductor 30 can be easily processed and shaped, and the heat loss of the non-magnetic conductor 30 can be reduced. Furthermore, the attenuation loss of the alternating magnetic field passing through the non-magnetic conductor 30 is relatively small.

[0091] According to the above calculation formula, the skin depth of the non-magnetic conductor 30 is related to its permeability, conductivity and the frequency of the alternating magnetic field, and the higher the frequency of the alternating magnetic field, the smaller the skin depth of the non-magnetic conductor 30.

[0092] In some embodiments, the material of the non-magnetic conductor 30 is graphite, whose permeability is approximately equal to the free permeability μ = 4π × 10⁻⁶. -7 H / m ≈ 1.2566 × 10 -6 H / m, when its conductivity σ is 100000S / m, and it is set at a frequency of 25000Hz (corresponding to angular frequency) When the graphite is placed in an alternating magnetic field, substituting the above calculation formula, its skin depth δ is approximately 10.1 mm. Therefore, the thickness of the graphite can be set to less than 30 mm; for example, the thickness of the non-magnetic conductor 30 can be 0.5 mm to 20 mm. This avoids both insufficient induced heat generation due to excessively thin graphite, which would prevent effective heating of the cookware 2, and excessive heat loss due to excessively thick graphite.

[0093] In other words, by limiting the thickness of the non-magnetic conductor 30 to less than three times the skin depth, when the non-magnetic conductor 30 is located in an alternating magnetic field, a portion of the alternating magnetic field can pass through the non-magnetic conductor with minimal loss, thus acting on the magnetic cookware 2. A portion of the alternating magnetic field can induce heat in the non-magnetic conductor 30, and the heat generated by the non-magnetic conductor 30 can be conducted to one side of the cookware 2 and heat the cookware 2.

[0094] It should be noted that the numerical values ​​and ranges involved in the embodiments of this application are approximate values. Due to the influence of the manufacturing process, there may be a certain range of errors, which can be considered negligible by those skilled in the art.

[0095] In some embodiments, the projection of the non-magnetic conductor 30 onto the panel 10 at least partially overlaps with the projection of the coil 20 onto the panel 10. Wherein, the portion not corresponding to the coil 20, for example, in a direction parallel to the panel 10, extends beyond the coil 20. This portion of the non-magnetic conductor 30 generates less or no induced heat due to less magnetic field passing through it, resulting in uneven induced heat generation across different portions of the non-magnetic conductor 30, leading to some heat loss.

[0096] In other words, by setting the non-magnetic conductor 30 opposite to the coil 20, the projection of the non-magnetic conductor 30 on the panel 10 overlaps with the projection of the coil 20 on the panel 10, so that the alternating magnetic field can act on the non-magnetic conductor 30 as much as possible, reducing magnetic field leakage, which helps to generate more induced heat on the non-magnetic conductor 30 and improve the heating efficiency of the cooking device 1.

[0097] The projection shape of the non-magnetic conductor 30 on the panel 10 can be circular, square, or other shapes. The size of the non-magnetic conductor 30 can be smaller than or equal to the size of the coil 20. This embodiment does not limit the shape, size, etc. of the non-magnetic conductor 30. For example, the projection shape and size of the non-magnetic conductor 30 on the panel 10 are the same as the projection shape and size of the coil 20 on the panel 10. This can avoid uneven induced heat on the non-magnetic conductor 30 and reduce heat loss.

[0098] Understandably, the shape of the magnetic element 60 varies depending on the shape of the coil 20. For example, the coil 20 may be a planar coil, a concave coil recessed towards the side away from the panel 10, etc. The magnetic element 60 may include multiple magnetic strips, with the multiple magnetic strips spaced apart circumferentially along the coil 20. The above are illustrative examples of the coil 20 and the magnetic element 60 and do not constitute a limitation on the coil 20 and the magnetic element 60.

[0099] In some embodiments, the first end of the magnetic element 60 is bent and extends toward one side of the panel 10 and surrounds the outer side of the coil 20 circumferentially.

[0100] In other words, the magnetic component 60 can have an approximately L-shaped multi-segment structure, including a body portion 61 and a first bent segment 62. The body portion 61 is located on the side of the coil 20 away from the panel 10, and the extension direction of the body portion 61 can be parallel to or at an angle to the panel 10. The first bent segment 62 is at an angle to the body portion 61 and extends toward the panel 10. For example, the extension direction of the first bent segment 62 is perpendicular to the panel 10, and the end of the first bent segment 62 away from the body portion 61 constitutes the first end of the magnetic component 60.

[0101] By setting the body part 61, the alternating magnetic field can be guided to conduct along the extension direction of the body part 61, thereby reducing magnetic leakage of the alternating magnetic field at the bottom of the cooking device 1.

[0102] By setting the first bending section 62, the alternating magnetic field can be guided to conduct in the direction toward or away from the panel 10 and concentrated on the cookware 2 and the non-magnetic conductor 30, reducing the magnetic leakage of the alternating magnetic field in the circumference of the cooking device 1, which helps the cookware 2 and the non-magnetic conductor 30 to be heated evenly.

[0103] In some embodiments, the gap between the first end of the magnetic element 60 and the panel 10 is less than or equal to the thickness of the non-magnetic conductor 30. For example, the first end of the magnetic element 60 may be attached to the panel 10.

[0104] In other words, in the direction parallel to the panel 10, the first bending segment 62 is located on the outer side of the heat insulation member 40 and the non-magnetic conductor 30 in the circumferential direction. The first bending segment 62 surrounds the outer side of the heat insulation member 40 and the non-magnetic conductor 30. In this way, the alternating magnetic field can be concentrated on the non-magnetic conductor 30, which helps to make the induced heat generated in each part of the non-magnetic conductor 30 more uniform, and also allows the alternating magnetic field to be concentrated on the cookware 2.

[0105] In some embodiments, the coil 20 is annular, that is, the middle part of the coil 20 is not wound, and the second end of the magnetic element 60 is bent and extended toward one side of the panel 10. The second end of the magnetic element 60 extends into the middle part of the coil 20 so that the coil 20 is wrapped around the outside of the second end of the magnetic element 60.

[0106] Thus, the magnetic component 60 has an approximately U-shaped multi-segment structure. The magnetic component 60 also includes a second bent segment 63. The first bent segment 62 and the second bent segment 63 are respectively connected to both ends of the body portion 61. The second bent segment 63 is angled to the body portion 61 and extends towards the panel 10. For example, the extension direction of the second bent segment 63 is perpendicular to the panel 10. The end of the second bent segment 63 away from the body portion 61 constitutes the second end of the magnetic component 60. The coil 20 is located within the area enclosed by the body portion 61, the first bent segment 62, and the second bent segment 63.

[0107] By setting the second bending section 63, the alternating magnetic field can be guided to conduct in the direction toward or away from the panel 10, and act more concentratedly on the cookware 2 and the non-magnetic conductor 30, reducing the magnetic leakage of the alternating magnetic field in the circumference of the cooking device 1, which helps the cookware 2 and the non-magnetic conductor 30 to be heated evenly.

[0108] In other words, by setting an approximately U-shaped magnetic component 60, a conduction path with low attenuation loss can be provided for the alternating magnetic field, so that the alternating magnetic field can act on the cookware 2 and the non-magnetic conductor 30 with more energy, thereby improving the heating efficiency of the cooking device 1.

[0109] Regarding the structure of the magnetic element 60, the magnetic element 60 can be a sheet-like structure (not shown), and the magnetic element 60 is recessed on the side facing the panel 10 to form an annular groove for accommodating the coil 20. The magnetic element 60 can also be strip-shaped and spaced apart circumferentially along the coil 20 to reduce cost. Alternatively, when the magnetic element 60 is strip-shaped, each magnetic element 60 can be an approximately U-shaped magnetic strip. Alternatively, the approximately U-shaped magnetic element 60 can also be formed by splicing two approximately L-shaped magnetic strips together (e.g., Figure 2 (As shown).

[0110] The above are examples illustrating the shape and quantity of the magnetic component 60. This embodiment does not limit the shape and quantity of the magnetic component 60. For example, the magnetic component 60 can also be composed of a combination of approximately U-shaped magnetic strips and approximately L-shaped magnetic strips.

[0111] The extension positions of the first and second ends of the magnetic component 60 can be defined by the extension lengths of the first bent segment 62 and the second bent segment 63. The extension lengths of the first bent segment 62 and the second bent segment 63 can be the same. For example, when the first bent segment 62 is in contact with the panel 10, the second bent segment 63 can sequentially pass through the heat insulation component 40 and the non-magnetic conductor 30 and be in contact with the panel 10. The extension lengths of the first bent segment 62 and the second bent segment 63 can also be different. For example, the second bent segment 63 can extend through the middle of the coil 20 to the position of the heat insulation component 40, and the length of the first bent segment 62 can be greater than the length of the second bent segment 63.

[0112] In some embodiments, when the non-magnetic conductor 30 is disposed on the side of the panel 10 facing the coil, the non-magnetic conductor 30 and the panel 10 can be spaced apart, i.e., there is a gap between the non-magnetic conductor 30 and the panel 10. Thus, when the cooking device 1 is used, the non-magnetic conductor 30 induced heat in the alternating magnetic field. The heat from the non-magnetic conductor 30 can be conducted to the panel 10 via thermal radiation, or it can be conducted to the air within the gap. The air within the gap absorbs heat and then conducts it to the panel 10.

[0113] In some embodiments, the non-magnetic conductor 30 can also be attached to the inner wall surface of the panel 10 facing the coil 20. In this way, the non-magnetic conductor 30 can be in direct contact with the panel 10, and the non-magnetic conductor 30 can directly conduct its heat to the panel 10, resulting in high heat transfer efficiency and low heat loss.

[0114] In some embodiments, the non-magnetic conductor 30 can be bonded to the panel 10 with thermally conductive adhesive. This results in a larger contact area between the non-magnetic conductor 30 and the panel 10, which is beneficial for improving heat conduction efficiency.

[0115] Considering that the panel 10 can reach a high temperature, such as 500°C, when the cooking device 1 is working, in some embodiments, the non-magnetic conductor 30 can also be mounted on the coil support 50 and mounted on the panel 10 via the coil support 50. For example, the non-magnetic conductor 30 can be sandwiched between the panel 10 and the coil support 50. In this way, the adhesion stability between the non-magnetic conductor 30 and the panel 10 is high, avoiding the thermal adhesive from weakening due to the high temperature of the panel 10 when the cooking device 1 is working, thus preventing the non-magnetic conductor 30 from falling off the panel 10.

[0116] In some embodiments, when the non-magnetic conductor 30 is disposed on the side of the panel 10 away from the coil disk, the non-magnetic conductor 30 can be bonded to the panel 10 with thermally conductive adhesive. In this way, the contact area between the non-magnetic conductor 30 and the panel 10 is large, which is beneficial to improving the heat conduction efficiency.

[0117] In some embodiments, the non-magnetic conductor 30 can also be disposed on the outer wall surface of the panel 10 away from the coil disk by spraying or melting.

[0118] Taking graphite as an example, the material of the non-magnetic conductor 30 can be atomized or melted and sprayed onto the panel 10 at a height. After the graphite is deposited and solidified, a graphite coating is formed.

[0119] In this way, the connection between the non-magnetic conductor 30 and the panel 10 is highly reliable and less affected by temperature. The thickness, position and shape of the non-magnetic conductor 30 are easy to control precisely, and the heat generated by the non-magnetic conductor 30 can be directly transferred to the cookware 2, reducing heat loss during the conduction process and resulting in high heat conduction efficiency.

[0120] In some embodiments, considering that the temperature of the non-magnetic conductor 30 is high when it is heated, for example, the temperature of the non-magnetic conductor 30 can reach 600°C-700°C, and when the non-magnetic conductor 30 is disposed on the side of the panel 10 away from the coil, the cooking device 1 may also include a heat insulation component 40. The material of the heat insulation component 40 may be silicon dioxide, glass fiber, aerogel, etc., which has high thermal resistance and low thermal conductivity.

[0121] In some embodiments, the heat insulation element 40 is disposed between the non-magnetic conductor 30 and the coil 20. That is, in the thickness direction of the panel 10, the heat insulation element 40 can physically isolate the non-magnetic conductor 30 and the coil 20, avoiding direct heat conduction between the non-magnetic conductor 30 and the coil 20, reducing the heat conducted between the non-magnetic conductor 30 and the coil 20 by thermal radiation, and when the non-magnetic conductor 30 and the coil 20 transfer heat through the air, they need to bypass the heat insulation element 40, and the heat transfer path becomes longer.

[0122] In this way, even if the heat insulation component 40 can absorb some of the heat conducted by the non-magnetic conductor 30 and generate heat, the amount of heat directly obtained by the coil 20 from the heat insulation component 40 will be reduced. Furthermore, due to the longer path length for heat transfer between the non-magnetic conductor 30 and the coil 20 via the air, the amount of heat obtained by the coil 20 from the air will also be reduced. This prevents the coil 20 from overheating and generating high temperatures, improves the lifespan of the coil 20, and reduces heat loss from the non-magnetic conductor 30 towards the side away from the panel 10, allowing more heat to be conducted to the side of the panel 10.

[0123] In some embodiments, the heat insulation element 40 may be mounted on the coil support 50, for example by adhesive, snap-fit ​​or other means. This embodiment does not limit the mounting form of the heat insulation element 40.

[0124] In some embodiments, the heat insulation member 40 is provided with a receiving groove 41, the opening of the receiving groove 41 facing the panel 10, that is, the wall surface of the heat insulation member 40 facing the panel 10 is recessed towards the side away from the panel 10, and the non-magnetic conductor 30 is disposed in the receiving groove 41.

[0125] In some embodiments, the size of the receiving groove 41 may be larger than the size of the non-magnetic conductor 30 to facilitate the installation of the non-magnetic conductor 30 within the receiving groove 41. Alternatively, the size of the receiving groove 41 may be comparable to the size of the non-magnetic conductor 30, so that when the non-magnetic conductor 30 is installed within the receiving groove 41, the sidewall of the non-magnetic conductor 30 can contact the sidewall of the receiving groove 41 to provide a snap-fit ​​and limit the non-magnetic conductor 30, preventing the non-magnetic conductor 30 from shifting in a direction parallel to the panel 10.

[0126] In some embodiments, when the non-magnetic conductor 30 is spaced apart from the panel 10, the heat insulation member 40 can contact the panel 10. In this case, the panel 10 can cover the opening of the receiving groove 41, thereby reducing heat loss at the opening of the receiving groove 41.

[0127] In some embodiments, when the non-magnetic conductor 30 is attached to the panel 10, the heat insulation member 40 can also be attached to the panel 10. In this way, the panel 10 can cover the opening of the receiving groove 41, which can reduce the heat loss of the non-magnetic conductor 30 through the air.

[0128] The above example, assuming the heat insulation component 40 is in contact with the panel 10, illustrates the relative position between the non-magnetic conductor 30 and the panel 10. This does not constitute a limitation on the relative position between the heat insulation component 40 and the panel 10. For example, the heat insulation component 40 may be spaced apart from the panel 10; in this case, the non-magnetic conductor 30 and the panel 10 may be in contact or spaced apart.

[0129] By placing the non-magnetic conductor 30 within the receiving groove 41, the stacking thickness of the non-magnetic conductor 30, the heat insulation member 40, and the coil 20 in the thickness direction of the panel 10 is reduced, which helps to reduce the size of the cooking device 1. Furthermore, since the sidewall of the receiving groove 41 surrounds the circumferentially outer side of the non-magnetic conductor 30, heat loss from the non-magnetic conductor 30 in the direction parallel to the panel 10 can also be reduced, and more heat can be conducted towards the panel 10 through the guidance of the sidewall of the receiving groove 41.

[0130] In some embodiments, when the non-magnetic conductor 30 is disposed in the receiving groove 41 and both the non-magnetic conductor 30 and the heat insulation component 40 are in contact with the panel 10, the non-magnetic conductor 30 and the heat insulation component 40 can be pressed against the panel 10 by the coil bracket 50. In this way, the assembly method of the non-magnetic conductor 30 and the heat insulation component 40 is relatively simple, and the fixing method of the non-magnetic conductor 30 and the heat insulation component 40 is not affected by the temperature inside the cooking device 1, and the reliability is high.

[0131] In some embodiments, a heat insulation gap M is provided between the heat insulation member 40 and the coil 20 of the coil disk.

[0132] The heat insulation gap M can be formed in different ways. For example, the heat insulation component 40 can be separated from the coil disk, with the heat insulation component 40 spaced apart from the coil disk as a whole (not shown). Alternatively, the heat insulation component 40 can be connected to the coil disk and spaced apart from a portion of the coil disk's structure. For example, the heat insulation component 40 can be connected to the coil support 50 and spaced apart from the coil 20 (e.g., ...). Figure 4 (As shown). This embodiment does not limit the forming method of the thermal insulation gap M.

[0133] For ease of explanation, the following example illustrates the situation where the heat insulation component 40 is connected to the coil support 50, and the heat insulation component 40 and the coil 20 are spaced apart, with no direct physical contact between the heat insulation component 40 and the coil 20.

[0134] This reduces the stacking dimensions of the heat insulation component 40 and the coil disc in the thickness direction of the panel 10 (e.g., Figure 3 and Figure 4 As shown in the figure, it can avoid direct heat conduction between the heat insulation component 40 and the coil 20, which would cause the temperature of the coil 20 to rise. In addition, the contact area between the heat insulation component 40 and the air, as well as between the coil 20 and the air, is increased. The air flow in the heat insulation gap M can also cool down the heat insulation component 40 and the coil 20, which helps to reduce the temperature of the heat insulation component 40 and the coil 20.

[0135] Understandably, if the gap between the coil 20 and the non-magnetic conductor 30 is too small, the temperature of the coil 20 may be too high. If the gap between the coil 20 and the non-magnetic conductor 30 is too large, the strength of the alternating magnetic field at the location of the non-magnetic conductor 30 and the location of the cookware 2 may be too small, resulting in smaller eddy currents generated on the non-magnetic conductor 30 and the cookware 2, and a decrease in the thermal efficiency of the cooking device 1.

[0136] Therefore, the distance between the coil 20 and the non-magnetic conductor 30 can be set within a suitable range, so that the cooking device 1 can have a high heating efficiency without overheating the coil 20. For example, the distance between the coil 20 and the non-magnetic conductor 30 can be 2mm-25mm, wherein the thickness of the heat insulation member 40 can be 3mm-15mm, and the size of the heat insulation gap M can be 0.5mm-5mm.

[0137] The above are examples illustrating the spacing between the coil 20 and the non-magnetic conductor 30, the thickness of the heat insulation component 40, and the heat insulation gap M. They do not constitute a limitation on the spacing between the coil 20 and the non-magnetic conductor 30, the thickness of the heat insulation component 40, and the heat insulation gap M.

[0138] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0139] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooking device, characterized in that, include: panel; Coil disk, used to generate alternating magnetic fields; A non-magnetic conductor is disposed on the side of the panel facing the coil disk, or the non-magnetic conductor is disposed on the side of the panel away from the coil disk, and the non-magnetic conductor is configured to generate heat in the alternating magnetic field. The thickness of the non-magnetic conductor satisfies the following relationship: ， ， Where H is the thickness of the non-magnetic conductor (mm), δ is the skin depth (mm), ω is the angular frequency of the alternating magnetic field (rad / s), σ is the conductivity of the non-magnetic conductor (S / m), and μ is the permeability of the non-magnetic conductor (H / m).

2. The cooking apparatus according to claim 1, characterized in that, The coil disk includes a coil, and the projection of the non-magnetic conductor on the panel at least partially overlaps with the projection of the coil on the panel.

3. The cooking apparatus according to claim 1, characterized in that, The coil disk includes a coil and a magnetic element, with the coil disposed between the panel and the magnetic element; The first end of the magnetic element is bent and extends toward one side of the panel and surrounds the outside of the coil, and the gap between the first end of the magnetic element and the panel is less than or equal to the thickness of the non-magnetic conductor.

4. The cooking apparatus according to claim 3, characterized in that, The coil is ring-shaped, and the second end of the magnetic element is bent and extends toward one side of the panel, with the coil wrapped around the outside of the second end of the magnetic element.

5. The cooking apparatus according to any one of claims 1-4, characterized in that, The non-magnetic conductor is attached to the inner wall surface of the panel facing the coil disk.

6. The cooking apparatus according to any one of claims 1-4, characterized in that, The non-magnetic conductor is applied to the outer wall surface of the panel away from the coil disk by spraying or melting.

7. The cooking apparatus according to claim 5, characterized in that, The cooking device also includes a heat insulation component disposed between the non-magnetic conductor and the coil.

8. The cooking apparatus according to claim 7, characterized in that, The heat insulation component is provided with a receiving groove, the opening of which faces the panel, and the non-magnetic conductor is disposed in the receiving groove.

9. The cooking apparatus according to claim 8, characterized in that, The panel covers the opening of the receiving groove.

10. The cooking apparatus according to claim 7, characterized in that, There is a heat insulation gap between the heat insulation component and the coil of the coil disk.

11. The cooking apparatus according to any one of claims 1-4, characterized in that, The material of the non-magnetic conductor is at least one of titanium, graphite, graphene, aluminum, and copper.

12. The cooking apparatus according to claim 11, characterized in that, The non-magnetic conductor is made of graphite and has a thickness of 0.5mm-20mm.

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