Electromagnetic heating devices and electromagnetic cooking appliances
By introducing magnetic field adjustment and pressing components into the electromagnetic heating device, the processing difficulty and installation inconvenience of existing electromagnetic heating cooking appliances are solved, achieving uniform heating and tumbling of food inside the pot, and improving the cooking effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG SUPOR ELECTRICAL APPLIANCES MFG CO LTD
- Filing Date
- 2024-12-16
- Publication Date
- 2026-05-26
Smart Images
Figure CN224290106U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates generally to the technical field of kitchen appliances, and more specifically to an electromagnetic heating device and an electromagnetic cooking appliance. Background Technology
[0002] Currently, electromagnetic heating cooking appliances such as IH rice cookers and IH electric pressure cookers all generate a magnetic field through a coil wound around a wire, which induces eddy currents in the inner pot to heat the food inside. Existing cooking appliances use a magnetic component on the outside of the inner pot. During the electromagnetic heating process, a temperature difference is generated inside the inner pot, causing thermal convection between the liquid and food, resulting in more even heating and ensuring uniform and consistent cooking results. However, in existing technologies, if the magnetic component is integrated with the inner pot, the manufacturing difficulty of the inner pot increases, hindering production reduction. Conversely, if the magnetic component is separate from the inner pot, installation is inconvenient, and its position relative to the coil is prone to change, affecting the cooking effect.
[0003] Therefore, there is a need to provide an electromagnetic heating device and an electromagnetic cooking appliance to at least partially solve the above problems. Utility Model Content
[0004] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.
[0005] To at least partially solve the above problems, the first aspect of this utility model provides an electromagnetic heating device for electromagnetically heating the cooking container of an electromagnetic cooking appliance, the electromagnetic heating device comprising:
[0006] Coil;
[0007] A coil, the coil being disposed on the side of the coil disc facing away from the cooking container;
[0008] A magnetic field adjustment component for locally altering the magnetic field distribution generated by energizing the coil, the magnetic field adjustment component being located on the side of the coil facing the cooking container; and
[0009] A clamping member is located on the side of the magnetic field adjusting member facing away from the coil disk and is connected to the coil disk. The magnetic field adjusting member is clamped between the clamping member and the coil disk.
[0010] According to this solution, the magnetic field adjustment component can locally interfere with the magnetic field at the position between the coil and the cooking container; causing the magnetic field lines radiating towards the cooking container to be unevenly distributed; when electromagnetically heating the cooking container, it changes the heat distribution generated by the cooking container, forming locally uneven heating, creating areas with different temperatures, and generating local temperature differences. This promotes faster and more intense thermal convection of the liquid and food in the cooking container, resulting in more thorough boiling and churning of the liquid and food, more even heating of the food, and better taste of the cooked food. The position of the magnetic field adjustment component can be limited by the clamping component, preventing the magnetic field adjustment component from falling off or shifting its position after long-term use. Furthermore, the magnetic field adjustment component is easy to fix and install, reducing the assembly difficulty of the whole system consisting of the magnetic field adjustment component, coil, and clamping component.
[0011] Optionally, the magnetic field adjustment component includes a plurality of first partial functional bodies, which are arranged in a circumferential array or radially spaced along the electromagnetic heating device, and the pressing component includes a stop portion, which abuts against the first partial functional bodies on the side facing away from the cooking container.
[0012] According to this solution, the orderly arrangement of multiple first partial functional units enables the coil to create an effective uneven heating effect on the cooking container, ensuring heat convection between the liquid and food within the container. Furthermore, the abutment portion defines the position of the first partial functional units, preventing them from detaching or shifting.
[0013] Optionally, the clamping member further includes a plurality of limiting portions connected to the side of the abutment portion facing away from the cooking container. The plurality of limiting portions are arranged at intervals, and each of the first partial functional bodies is sandwiched between adjacent limiting portions.
[0014] According to this solution, in addition to pressing the first local functional body, the degree of freedom of the first local functional body in the circumferential or radial direction of the electromagnetic heating device is also restricted to ensure that the position of the first local functional body will not change, so that the magnetic field line distribution of the entire coil area remains unchanged, thus ensuring the uneven heating effect on the cooking container.
[0015] Optionally, when the plurality of first partial functional units are arranged along the circumferential array, the abutting portion is integrally constructed as a ring extending along the circumferential direction, and the ring-shaped abutting portion abuts against the plurality of first partial functional units;
[0016] When the plurality of first partial functional bodies are arranged at radial intervals, the abutment portion is configured as a strip extending radially, the abutment portions of the strip are arranged at circumferential intervals, and each abutment portion abuts against the plurality of first partial functional bodies.
[0017] According to this solution, a suitable abutment is designed based on the shape of the first partial functional body to ensure the fixing effect of the first partial functional body.
[0018] Optionally, the magnetic field adjustment component is constructed as a magnetic shield, and the distance s between the two contour edges of the first local functional body is in the range of 5mm ≤ s ≤ 85mm; or
[0019] The magnetic field adjustment component is constructed as a magnet, and the spacing s between two adjacent first local functional bodies is in the range of 5mm≤s≤85mm.
[0020] According to this solution, the uneven heating of the cooking container is more effective, resulting in better heating of the food. The heat exchange formed inside the cooking container allows the liquid and food inside to boil and tumble more fully, resulting in more even heating of the food and preventing it from being undercooked.
[0021] Optionally, the width of each of the first partial functional bodies in the circumferential direction gradually increases from the radial direction outward and / or the height direction upward of the electromagnetic heating device.
[0022] According to this solution, multiple local functional bodies, including fan-shaped and similar patterns, can be formed on the coil. Compared to other shapes such as rings, circles, and polygons, the local functional bodies with gradually widening patterns have the structural characteristic of being narrower closer to the bottom center of the cooking container and wider further away from the bottom center. This allows the local functional bodies to cover a larger area of the cooking container, at least at the bottom. The adjustment area for heat distribution within the cooking container is also larger, resulting in a larger coverage area for local temperature difference zones and achieving a wide-range, uneven heating and boiling effect. Furthermore, when the local functional bodies form the inner or outer surface of the pot, the appearance of the product can be shaped based on the gradually widening pattern, making the overall appearance simpler, more aesthetically pleasing, and visually appealing.
[0023] Optionally, the coil disk has a positioning structure in the middle, and the magnetic field adjustment component further includes a ring-shaped second partial functional body. The second partial functional body is located in the middle of the coil disk, and the narrow ends of the plurality of first partial functional bodies are all connected to the second partial functional body. The second partial functional body cooperates with the positioning structure.
[0024] According to this scheme, the second local functional body of the magnetic field adjustment component corresponds and cooperates with the positioning structure of the coil disk, reducing the difficulty of operation during installation. After the magnetic field adjustment component is installed, the installation position is determined, ensuring the adjustment effect of the magnetic field lines of the coil disk.
[0025] Optionally, the coil disk has a recessed portion on the side near the magnetic field adjustment member, the recessed portion having an arc-shaped concave surface, and both the pressing member and the magnetic field adjustment member are integrally constructed into an arc shape adapted to the arc-shaped concave surface.
[0026] According to this solution, the coil, magnetic field adjustment component, and pressing component together form a recessed structure, which facilitates the placement of the cooking container inside the coil, and the pressing component and magnetic field adjustment component do not affect the placement of the cooking container.
[0027] Optionally, the coil disc has a positioning structure in the middle, and the clamping member further includes an annular positioning part located in the middle of the clamping member, which cooperates with the positioning structure.
[0028] According to this scheme, the clamping component and the coil disc are easy to operate during installation. Once the clamping component is installed, the installation position is determined, ensuring the limiting effect on the magnetic field adjustment component.
[0029] Optionally, the magnetic field adjustment component has a total coverage area corresponding to the coil. When the magnetic field adjustment component is constructed as a magnetic shield, the proportion of the total coverage area to the winding area of the coil ranges from 10% to 50%. When the magnetic field adjustment component is constructed as a magnetizing body, the proportion of the total coverage area to the winding area of the coil ranges from 40% to 80%.
[0030] According to this solution, both the overall heating effect and the local convection effect of the cooking container can be taken into account, thus ensuring the cooking quality of the food.
[0031] Optionally, the thickness of the coil disk is D1, and the thickness of the magnetic field adjustment component is D2, wherein 20% ≤ D2 / D1 ≤ 80%.
[0032] According to this scheme, the thickness of the magnetic field adjustment component is appropriate, which can not only ensure the structural strength of the magnetic field adjustment component itself, but also facilitate the processing of the magnetic field adjustment component.
[0033] Optionally, the magnetic field adjustment component is a magnetizing body or a magnetic shield.
[0034] According to this scheme, magnetic concentrators are used to enhance the local magnetic field strength, so that the magnetic field lines radiating toward the cooking container are concentrated in a small area, thereby radiating more magnetic field lines to the corresponding part of the cooking container, i.e. the concentrating part. The concentrating part can generate more heat than the non-concentrating part, forming a local high-temperature area, while the non-concentrating part forms a low-temperature area. Heat is transferred from the local high-temperature area to the low-temperature area to generate thermal convection.
[0035] By using a magnetic shield, the local magnetic field strength is weakened, so that the magnetic field lines radiating toward the cooking container are shielded by a small area and cannot radiate to the corresponding part of the cooking container, i.e. the shielded part. Because the shielded part cannot sense the magnetic field, it cannot sense the heat generation, or the sensed magnetic field is weak and generates less heat, forming a local low-temperature area; the unshielded part senses the heat generation and forms a high-temperature area. The heat is transferred from the high-temperature area to the local low-temperature area to generate thermal convection.
[0036] Optionally, the clamping member is secured to the coil disc by a plurality of fasteners or a plurality of snaps.
[0037] According to this scheme, the clamping component is easier to disassemble, maintain, and repair than the coil disc, and correspondingly, the magnetic field adjustment component is also easier to disassemble, repair, and clean.
[0038] The second aspect of this utility model provides an electromagnetic cooking appliance, which includes a cooking container and an electromagnetic heating device according to the first aspect of this utility model. The electromagnetic heating device is used to heat the cooking container. The magnetic field adjustment member is located between the coil and the cooking container. The cooking container includes a magnetic conductive layer.
[0039] According to this solution, the cooking container has magnetic sensing capability, which can sense heat generation when the coil is energized, thereby improving the heating and cooking effect on the food. Attached Figure Description
[0040] The following drawings, which illustrate embodiments of the present invention, are incorporated herein as part of the present invention for understanding the invention. The drawings show embodiments of the present invention and their descriptions, serving to explain the principles of the present invention. In the drawings,
[0041] Figure 1 This is an exploded view of the cooking container and electromagnetic heating device in an electromagnetic cooking appliance according to a preferred embodiment of the present invention.
[0042] Figure 2 for Figure 1 A bottom view of the electromagnetic heating device shown;
[0043] Figure 3 for Figure 1 The schematic cross-sectional view of the electromagnetic cooking appliance shown shows that the tangent of the cross-section is parallel to the center line extending in the front-back direction of the electromagnetic cooking appliance.
[0044] Figure 4 for Figure 3 Enlarged view of section A;
[0045] Figure 5 for Figure 1A top view of the magnetic field adjustment component in the electromagnetic cooking appliance shown.
[0046] Figure 6 for Figure 5 The diagram shows a cross-sectional view of the magnetic field adjustment component, wherein the tangent of the cross-section is perpendicular to the axis of the magnetic field adjustment component.
[0047] Figure 7 for Figure 1 A top view of the electromagnetic heating device in the electromagnetic cooking appliance shown;
[0048] Figure 8 for Figure 7 A bottom view of the mounting and fitting of the clamping component and the magnetic field adjustment component in the electromagnetic heating device shown;
[0049] Figure 9 This is a top view schematic diagram showing the installation and cooperation of the clamping member and the magnetic field adjustment member according to another preferred embodiment of the present invention;
[0050] Figure 10 This is a schematic diagram showing the distribution of the magnetic field adjustment component relative to the coil disk according to another preferred embodiment of the present invention;
[0051] Figure 11 This is a schematic diagram showing the distribution of the magnetic field adjustment component relative to the coil disk according to another preferred embodiment of the present invention.
[0052] Figure 12 for Figure 11 A top view showing the installation and assembly of the magnetic field adjustment component and the corresponding clamping component;
[0053] Figure 13 for Figure 11 A bottom view showing the installation and mating of the magnetic field adjustment component and the corresponding clamping component; and
[0054] Figure 14 This is a schematic diagram illustrating the adjustment of the temperature distribution of a cooking container using a magnetic field adjustment component according to a preferred embodiment of the present invention.
[0055] Explanation of reference numerals in the attached figures:
[0056] 100 Electromagnetic Cooking Appliances
[0057] 110 Electromagnetic heating device
[0058] 111 Coil
[0059] 112 coil
[0060] 113 Depression
[0061] 114 Positioning protrusion
[0062] 120 / 220 / 320 / 420 magnetic field adjustment components
[0063] 121 / 221 First Local Functional Unit
[0064] 122 Second Local Functional Entity
[0065] 130 / 230 / 330 clamping components
[0066] 131 / 231 / 331 Reception Department
[0067] 132 / 232 / 332 Limiting section
[0068] 133 / 233 Locking Hole
[0069] 140 Cooking Container
[0070] 141 Magnetic layer
[0071] 142 Thermal conductive layer
[0072] 234 / 334 Positioning Department
[0073] 235 Connecting section
[0074] S1 bypass area
[0075] S2 Total Coverage Area
[0076] A1 Covered Area
[0077] A2 Coverage Area Detailed Implementation
[0078] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with embodiments of the present invention.
[0079] To fully understand the embodiments of this utility model, a detailed structure will be presented in the following description. Obviously, the implementation of the embodiments of this utility model is not limited to the specific details familiar to those skilled in the art.
[0080] It should be understood that the terminology used herein is intended only to describe particular embodiments and is not intended to limit the invention. The singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. When the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.
[0081] The ordinal numbers such as "first" and "second" used in this utility model are merely identifiers and do not have any other meaning, such as a specific order. Furthermore, for example, the term "first component" does not imply the existence of a "second component," and the term "second component" does not imply the existence of a "first component." It should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and similar expressions used in this utility model are for illustrative purposes only and are not intended to be limiting.
[0082] The specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings, which show representative embodiments of the present invention and are not intended to limit the present invention.
[0083] This invention provides an electromagnetic cooking appliance that can cook food using electromagnetic heating technology.
[0084] The electromagnetic cooking appliance 100 can be, for example, an IH rice cooker, an induction cooker equipped with a cooking container 140, an IH pressure cooker, or other cooking appliances, and in addition to the function of cooking rice, the cooking appliance can also have various functions such as cooking porridge.
[0085] The electromagnetic cooking appliance 100 includes a cooking container 140 and an electromagnetic heating device 110. The electromagnetic heating device 110 includes a coil 112 and a coil disc 111 for winding the coil 112. The cooking container 140 can be a single-layer or multi-layer composite structure; the cooking container 140 includes a magnetically conductive layer, and optionally, it may also include a heat-conducting layer located inside the magnetically conductive layer. Further optionally, it may also include an outer layer, a non-stick coating, etc. Because the cooking container 140 includes a magnetically conductive layer, it has magnetic induction capability, and thus can generate heat induction when the coil 112 is energized, and transfer the heat to the food inside the cooking container 140.
[0086] For IH rice cookers, the cooking appliance includes a pot body and a lid. The cooking container 140 is the inner pot, and the pot body has a cylindrical inner pot storage section. The inner pot can be fixedly installed in the inner pot storage section, or it can be freely placed into or removed from the inner pot storage section for easy cleaning. The inner pot is usually made of metal and has a circular opening on its upper surface for holding materials to be heated, such as rice or soup. The pot body includes an electromagnetic heating device 110 for heating the inner pot. In this cooking appliance, the bottom of the inner pot has a bottom coil 111, which is integrally constructed as a recessed structure, and the bottom of the inner pot is accommodated within this recessed structure. Some cooking appliances have annular side coils 111 on the side of the inner pot.
[0087] The lid has a shape that substantially corresponds to the pot body. The lid is cladably mounted on the pot body; specifically, it is pivotally connected to the pot body via a pivot axis and can freely pivot between a closed and open position relative to the pot body about the pivot axis, facilitating the closing and opening of the pot body. When the lid is closed on the pot body, it covers the inner pot, forming a cooking space between them. The lid typically also has a sealing ring, which can be made of, for example, rubber, and is positioned between the lid and the inner pot to seal the cooking space when the lid is closed.
[0088] For induction cookers, the cooking container 140 can be a pot, a cup, or the like. The cooking container 140 is independent of the induction cooker, and can be placed on the upper surface of the induction cooker during use. In this cooking appliance, the coil 111 is constructed as a flat structure.
[0089] To improve heat convection within the cooking container 140 during cooking, this invention provides an electromagnetic heating device 110 for electromagnetically heating the cooking container 140 of an electromagnetic cooking appliance 100. In addition to the aforementioned coil 111 and coil 112, the electromagnetic heating device 110 also includes a magnetic field adjustment component 120 for locally altering the magnetic field distribution generated by the energized coil 112. The magnetic field adjustment component 120 is located between the coil 111 and the cooking container 140. For details, please refer to... Figures 1 to 4 The coil 112 is disposed on the side of the coil disk 111 facing away from the cooking container 140; the magnetic field adjusting member 120 is located on the other side of the coil disk 111 facing the cooking container 140. To secure the magnetic field adjusting member 120 to the coil disk 111, the electromagnetic heating device 110 also includes a clamping member 130. The clamping member 130 is located on the side of the magnetic field adjusting member 120 facing away from the coil disk 111 and is connected to the coil disk 111. The magnetic field adjusting member 120 is clamped between the clamping member 130 and the coil disk 111 of the coil assembly (coil disk 111 + coil 112).
[0090] According to the electromagnetic heating device 110 of this solution, the magnetic field adjustment component 120 can locally interfere with the magnetic field at the position between the coil 112 and the cooking container 140; causing the magnetic field lines radiating towards the cooking container 140 to be unevenly distributed; when electromagnetically heating the cooking container 140, it changes the heat distribution generated by the cooking container 140, forming locally uneven heating, creating areas with different temperatures, generating local temperature differences, causing the heat convection inside the cooking container 140 to become faster and more intense, making the liquid and food inside the cooking container 140 boil and tumble more fully, the food is heated more evenly, and the cooked food tastes better. Furthermore, the magnetic field adjustment component 120 is sandwiched between the clamping component 130 and the coil assembly. The installation position of the magnetic field adjustment component 120 is determined, allowing for precise control and guidance of the magnetic field, making the heat generated in the cooking container 140 controllable, generating uniform heat exchange during cooking, and ensuring consistent food cooking results. Preferably, the coil disk 111 has a recess 113 on the side near the magnetic field adjustment member 120. The recess 113 has an arc-shaped concave surface. Both the pressing member 130 and the magnetic field adjustment member 120 are integrally constructed into an arc shape that matches the arc-shaped concave surface.
[0091] Please see Figure 4 It should be noted that the thickness of the coil 111 is D1, and the thickness of the magnetic field adjusting component 120 is D2. The thickness of the magnetic field adjusting component 120 is typically 20% to 80% of the thickness of the coil 111, i.e., 20% ≤ D2 / D1 ≤ 80%; for example, 20%, 30%, 40%, 50%, 60%, 70%, or 80%, preferably 40% ≤ D2 / D1 ≤ 60%. This ensures both ease of manufacturing and optimal cooking results.
[0092] For details, please refer to Figure 5 and Figure 6 The magnetic field adjustment component 120 includes a plurality of first local functional bodies 121, which are arranged in a circumferential array along the electromagnetic heating device 110. Furthermore, the width of each first local functional body 121 in the circumferential direction gradually increases from the radial direction outward and / or the height direction upward of the electromagnetic heating device 110.
[0093] In this state, please refer to Figure 7 and Figure 8 The clamping member 130 includes an abutment portion 131, which abuts against the first partial functional body 121 on the side facing away from the cooking container 140. The clamping member 130 also includes a plurality of limiting portions 132, which are connected to the side of the abutment portion 131 facing away from the cooking container 140. The limiting portions 132 are spaced apart, and each first partial functional body 121 is sandwiched between adjacent limiting portions 132. For example... Figure 8In the electromagnetic heating device 110, multiple limiting portions 132 are arranged in a circumferential array. When multiple first partial functional bodies 121 are arranged in the circumferential array, the abutment portion 131 can be integrally constructed as a ring extending circumferentially, and the ring-shaped abutment portion 131 abuts against the multiple first partial functional bodies 121. Furthermore, to ensure the installation effect of the magnetic field adjustment component 120, a positioning structure can be provided in the middle of the coil disk 111; the magnetic field adjustment component 120 also includes a ring-shaped second partial functional body 122, which is located in the middle of the coil disk 111. The narrow ends of the multiple first partial functional bodies 121 are all connected to the second partial functional body 122, and the second partial functional body 122 cooperates with the positioning structure in the middle of the coil disk 111. The clamping component 130 can be fixed to the coil disk 111 by multiple fasteners or multiple clips. For example Figure 8 In the middle, the clamping member 130 is provided with a locking hole 133, which can be understood as being used to install fasteners such as screws. (Return to reference) Figure 3 and Figure 4 Both the coil disk 111 and the magnetic field adjustment component 120 have through holes in their middle portions. Near the edge of the through hole in the coil disk 111, a positioning protrusion 114 is provided. The positioning protrusion 114 is adapted to the through hole in the magnetic field adjustment component 120, so that the coil disk 111 and the magnetic field adjustment component 120 form a nested positioning effect. In an embodiment not shown, the magnetic field adjustment component 120 can be positioned by providing correspondingly shaped grooves or positioning holes on the surface of the coil disk 111, and fastened by pressure plates, screws, buckles, etc.
[0094] Furthermore, in embodiments not shown, the plurality of first partial functional units may also be configured to be arranged radially spaced along the electromagnetic heating device 110. When the plurality of first partial functional units are arranged at intervals along the radial direction, the aforementioned abutment portion is configured as a strip extending radially; correspondingly, the strip-shaped abutment portions are arranged circumferentially spaced, and each abutment portion abuts against the plurality of first partial functional units.
[0095] Please see Figure 9 Alternatively, the magnetic field adjustment component 220 may consist only of a plurality of first local functional bodies 221 arranged in a circumferential array as described above. In this state, Figure 9 A clamping member 230 suitable for a magnetic field adjustment member 220 is shown. The clamping member 230 includes an annular abutment portion 231. Furthermore, a positioning structure is provided in the middle of the coil disk 111; correspondingly, the clamping member 230 also includes an annular positioning portion 234, located in the middle of the clamping member 230. It is understood that the positioning portion 234 cooperates with the positioning structure of the coil disk 111. A connecting portion 235 is provided between the positioning portion 234 and the abutment portion 231, so that the positioning portion 234 and the abutment portion 231 are interconnected.
[0096] Please see Figure 10 The magnetic field adjustment member 320 is constructed in a sheet shape and arranged in a circumferential array as described above. It can be understood that, in this state, the clamping member can be constructed as strips distributed radially at intervals along the electromagnetic heating device.
[0097] Alternatively, please refer to Figure 11 The magnetic field adjustment component 420 is constructed in a ring shape, with multiple first local functional units spaced apart and nested together along the radial direction of the electromagnetic heating device. In this state, please refer to... Figure 12 and Figure 13 This paper illustrates a clamping member 330 suitable for a magnetic field adjustment member 420. Specifically, the clamping member 330 includes abutment portions 331 and positioning portions 334. Multiple abutment portions 331 are spaced apart circumferentially along the electromagnetic heating device, and the positioning portions 334 can be constructed as annular and located in the middle of the clamping member 330, connected to the abutment portions 331. Furthermore, each abutment portion 331 has multiple limiting portions 332 on its side facing away from the cooking container 140, and these limiting portions 332 are spaced apart radially along the electromagnetic heating device. The annular magnetic field adjustment member 420 is sandwiched between adjacent limiting portions 332 along the radial direction of the electromagnetic heating device.
[0098] Figure 10 and Figure 11 The diagram shows the distribution of the magnetic field adjustment components (or the projection of the magnetic field adjustment components onto the coil disk 111) relative to the coil disk 111. The blank areas represent the uncovered areas A1, while the shaded areas represent the covered areas A2.
[0099] Figure 14 The cooking container 140 is shown to include a magnetically conductive layer 141 and a heat-conducting layer 142, with the magnetically conductive layer 141 closer to the coil assembly than the heat-conducting layer 142. The magnetic field adjustment member 120 (first local functional body 121) is a magnetizing body or a magnetic shield, such as a magnetic shield. The material of the magnetic shield can be aluminum, a ferromagnetic alloy, conductive plastic, or magnetically shielded glass, etc. When the cooking container 140 is heated, a high-temperature point T1 is generated at the edge of the first local functional body (or the uncovered area A1 of the coil 111). After heat conduction, a high-temperature point T2 and a low-temperature point T3 are generated on the inner surface of the cooking container 140, where the high-temperature point T2 corresponds to the high-temperature point T1 in the thickness direction, and the low-temperature point T3 corresponds to the first local functional body 121 in the thickness direction. After a temperature difference is generated on the inner surface of the cooking container 140, heat flows from the high-temperature area to the low-temperature area (i.e., from T2 to T3), promoting tumbling and convection of food within the cooking container 140, resulting in uniform cooking.
[0100] The spacing s is the distance between the two contour edges of the first local functional body 121 that are spaced apart from itself. A test was conducted using an example cooking container 140 of this invention, and the relationship between temperature difference and spacing s was obtained, as shown in the table below.
[0101]
[0102] Therefore, as the spacing s increases, the temperature difference between the high-temperature point T2 and the low-temperature point T3 also increases. If the spacing is too small, the temperature difference is too small, the rice's tumbling force is too weak, and the moisture content of the cooked rice is uneven. If the spacing is too large, the temperature difference is too large, the temperature in the low-temperature zone is too low, and the rice is prone to being undercooked in the low-temperature zone. At the same time, because the area of the temperature difference zone decreases with the larger spacing, the tumbling will also be uneven. Therefore, the spacing s is set to 5mm to 85mm, for example, 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, etc.; preferably 10mm to 60mm.
[0103] Alternatively, the magnetic field adjustment component 120 can be constructed as a magnet, and the material of the magnet can be ferrite, ferrosilicon alloy, iron-nickel alloy, or nanomaterials, etc. When the cooking container 140 is heated, a high-temperature point is generated at the first local functional body (or the covered area A2 of the coil). After heat conduction, a high-temperature point T3 and a low-temperature point T2 are generated on the inner surface of the cooking container 140, wherein the high-temperature point T3 corresponds to the position of the covered area A2 in the thickness direction, and the low-temperature point T2 corresponds to the uncovered area A1 in the thickness direction. After a temperature difference is generated on the inner surface of the cooking container 140, heat flows from the high-temperature area to the low-temperature area, promoting the tumbling and convection of food within the cooking container 140, resulting in uniform cooking. In this scheme, the spacing s is the distance between two adjacent first local functional bodies, and the spacing s is set to 5mm to 85mm, preferably 10mm to 60mm.
[0104] Return to reference Figure 1 The coil 112 has a winding area S1 corresponding to the coil disk 111, and the magnetic field adjustment member 120 has a total coverage area S2 corresponding to the coil 112.
[0105] By appropriately setting the area ratio of the magnetic field adjustment component 120, the overall heat of the cooking container 140 can meet the cooking requirements while ensuring both overall heating effect and local convection effect. When the magnetic field adjustment component 120 is a magnetic shield, the proportion of the total coverage area S2 of the magnetic field adjustment component 120 corresponding to the coil 112 to the aforementioned winding area S1 is 10% to 50%, for example, the area ratio can be suitable proportions such as 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc., preferably 40%. If the area ratio of the magnetic shield is too large, the heat transfer will be slow, the thermal efficiency will be low, and the cooking time will be long; if the area ratio is too small, the temperature difference will be small, and the large-scale tumbling effect will not be achieved.
[0106] When the magnetic field adjusting member 120 is constructed as a magnetizing body, the proportion of the total coverage area S2 of the magnetic field adjusting member 120 corresponding to the coil 112 to the aforementioned winding area S1 is 40% to 80%. For example, the area proportion can be a suitable proportion such as 40%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc., preferably 55%. If the area proportion of the magnetizing body is too large, the temperature difference in the gap area will be too small, and the convection effect will be reduced. If the area proportion is too small, the thermal efficiency will be insufficient.
[0107] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of the invention. Terms such as “set” appearing herein can refer to either a component being directly attached to another component or a component being attached to another component via an intermediary. A feature described in one embodiment may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.
[0108] This utility model has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this utility model to the described embodiments. Those skilled in the art will understand that many more variations and modifications can be made based on the teachings of this utility model, and all such variations and modifications fall within the scope of protection claimed by this utility model.
Claims
1. An electromagnetic heating device for electromagnetic heating of a cooking vessel of an electromagnetic cooking appliance, characterized in that, The electromagnetic heating device includes: Coil disc; A coil, the coil being disposed on the side of the coil disc facing away from the cooking container; A magnetic field adjustment component for locally altering the magnetic field distribution generated by energizing the coil, the magnetic field adjustment component being located on the side of the coil facing the cooking container; and A clamping member is located on the side of the magnetic field adjusting member facing away from the coil disk and is connected to the coil disk. The magnetic field adjusting member is clamped between the clamping member and the coil disk.
2. The electromagnetic heating device according to claim 1, characterized in that, The magnetic field adjustment component includes a plurality of first local functional bodies, which are arranged in a circumferential array or radially spaced along the electromagnetic heating device. The pressing component includes a stop portion, which abuts against the first local functional bodies on the side facing away from the cooking container.
3. The electromagnetic heating device according to claim 2, characterized in that, The clamping member further includes a plurality of limiting parts, which are connected to the side of the abutment facing away from the cooking container. The plurality of limiting parts are arranged at intervals, and each of the first partial functional bodies is sandwiched between adjacent limiting parts.
4. The electromagnetic heating device according to claim 2, characterized in that, When the plurality of first partial functional units are arranged along the circumferential array, the abutting part is constructed as a ring extending along the circumferential direction, and the ring-shaped abutting part abuts against the plurality of first partial functional units. When the plurality of first partial functional bodies are arranged at radial intervals, the abutment portion is configured as a strip extending radially, the abutment portions of the strip are arranged at circumferential intervals, and each abutment portion abuts against the plurality of first partial functional bodies.
5. The electromagnetic heating device according to claim 2, characterized in that, The magnetic field adjustment component is constructed as a magnetic shield, and the distance s between the two separated contour edges of the first local functional body is in the range of: 5mm ≤ s ≤ 85mm; or The magnetic field adjustment component is constructed as a magnet, and the spacing s between two adjacent first local functional bodies is in the range of 5mm≤s≤85mm.
6. The electromagnetic heating device according to claim 2, characterized in that, The width of each of the first partial functional units in the circumferential direction gradually increases from the radial direction outward and / or the height direction upward of the electromagnetic heating device.
7. The electromagnetic heating device according to claim 6, characterized in that, The coil disk has a positioning structure in the middle, and the magnetic field adjustment component also includes a ring-shaped second local functional body. The second local functional body is located in the middle of the coil disk, and the narrow ends of the plurality of first local functional bodies are all connected to the second local functional body. The second local functional body cooperates with the positioning structure.
8. The electromagnetic heating device according to any one of claims 1 to 7, characterized in that, The coil disk has a recessed portion on the side near the magnetic field adjustment member. The recessed portion has an arc-shaped concave surface. Both the pressing member and the magnetic field adjustment member are integrally constructed into an arc shape that matches the arc-shaped concave surface.
9. The electromagnetic heating device according to any one of claims 1 to 6, characterized in that, The coil disc has a positioning structure in the middle, and the clamping member also includes an annular positioning part, which is located in the middle of the clamping member and cooperates with the positioning structure.
10. The electromagnetic heating device according to any one of claims 1 to 7, characterized in that, The magnetic field adjustment component has a total coverage area corresponding to the coil. When the magnetic field adjustment component is constructed as a magnetic shield, the proportion of the total coverage area to the winding area of the coil ranges from 10% to 50%. When the magnetic field adjustment component is constructed as a magnetizing body, the proportion of the total coverage area to the winding area of the coil ranges from 40% to 80%. And / or The thickness of the coil disk is D1, and the thickness of the magnetic field adjustment component is D2, wherein 20% ≤ D2 / D1 ≤ 80%.
11. The electromagnetic heating device according to any one of claims 1 to 7, characterized in that, The magnetic field adjustment component is a magnet or a magnetic shield, and / or the clamping component is fixed to the coil disc by multiple fasteners or multiple clips.
12. An electromagnetic cooking appliance, characterized in that, The electromagnetic cooking appliance includes a cooking container and an electromagnetic heating device according to any one of claims 1 to 11, the electromagnetic heating device being used to heat the cooking container, the magnetic field adjustment member being located between the coil and the cooking container, and the cooking container including a magnetic conductive layer.