A cooking appliance with an electromagnetic wire coil

Abstract

The utility model discloses a kind of electromagnetic wire disc for cooking utensil, including disc body, the electromagnetic coil of being wound in disc body, and the wire pressing rib being set to disc body, wire pressing rib and disc body between still being provided with isolation rib, first wire channel is formed between isolation rib and disc body, second wire channel is formed between isolation rib and wire pressing rib, electromagnetic coil is wound respectively in first wire channel and second wire channel to form double-layer coil structure, wire pressing rib and isolation rib are set in up and down staggered, the thickness of wire pressing rib is greater than the thickness of isolation rib. The elastic deformation ability of isolation rib wall thickness is relatively thin to improve, deformation occurs when winding conveniently using toughness, and then electromagnetic coil is embedded into first wire channel, the distance between outer coil and utensil is reduced, so that outer coil and utensil coupling distance is controlled in the range of efficient magnetic induction intensity. The thickness of wire pressing rib is relatively thick, can withstand the tension of electromagnetic coil winding, guarantee the neatness of inner and outer coil winding.

Description

Technical Field

[0001] This utility model belongs to the field of kitchen appliance technology, specifically relating to an electromagnetic coil for cooking utensils. Background Technology

[0002] IH (electromagnetic) heating technology achieves efficient heating based on the principle of electromagnetic induction and has become a core technology for high-end cooking appliances. The winding structure and positioning stability of its core component, the electromagnetic coil, directly affect the uniformity of the magnetic field distribution and heating efficiency. Currently, most mainstream electromagnetic coils use single-layer winding or simple double-layer winding, with positioning ribs on the surface of the coil pressing the coil against the surface.

[0003] However, the limiting ribs are mostly single-specification ribs, which cannot effectively limit double or multi-layer coils. After the coil outside the limiting rib is wound, it is prone to displacement under factors such as vibration and temperature changes due to poor limiting effect, causing the current element position to deviate from the design value. According to the Biot-Savart law, the relative position change of the current element and the vector diameter will directly change the magnetic induction intensity. Actual measurements show that when the coil is displaced by 0.5mm, the local magnetic field intensity fluctuation can reach 15%-20%, which seriously affects the heating stability. As for double-layer limiting ribs, they are usually set up in a corresponding manner to meet the limiting requirements of multi-layer coils. However, this setting makes the mold core-pulling structure complicated, and interference is prone to occur during demolding. The yield rate is only 80%-85%, and the production cycle of a single piece is also long, resulting in high manufacturing costs.

[0004] Based on this, Chinese patent CN204518116U discloses a multi-layer coil that achieves three-dimensional isolation between upper and lower single turns to prevent short circuits between turns. It includes a coil support, a magnetic strip, and enameled wire. Horizontal fan-shaped insulating winding ribs are provided between the coil layers, and the fan-shaped insulating winding ribs between each layer are staggered to limit the coil of each layer.

[0005] In the above scheme, although the purpose of good positioning of each layer of coil can be achieved, each sector-shaped insulating winding rib is also of a single specification, making it difficult to balance winding convenience and structural stability. If the thickness of the winding rib is too large, it will lead to an excessive gap between the outer coil and the pot. According to the magnetic field attenuation law, for every 1mm increase in gap, the magnetic field coupling efficiency decreases by 8%-12%, and a large amount of magnetic field leakage reduces the heating efficiency by 5%-8%.

[0006] Furthermore, the contradiction between the ease of winding and the structural strength makes the design of the thickness of the winding ribs particularly difficult. If the winding ribs are too thick, it is difficult to adapt to the direction of the coil through elastic deformation during winding, which can easily lead to problems such as wire jamming and wire breakage. If the winding ribs are too thin, they cannot withstand the coil tension and are prone to deformation after winding, which can lead to the collapse of the coil structure. Utility Model Content

[0007] This utility model provides an electromagnetic coil for cooking utensils to solve the problems of existing electromagnetic coils where the limiting ribs are difficult to effectively limit the coils of multiple layers, the high processing difficulty, and the uniformity of the limiting ribs in each layer, making it difficult to balance the convenience of winding and structural stability.

[0008] The technical solution adopted in this utility model is as follows:

[0009] An electromagnetic coil for cooking appliances includes a coil body, an electromagnetic coil wound on the coil body, and a pressure rib on the coil body. An isolation rib is also provided between the pressure rib and the coil body. A first winding channel is formed between the isolation rib and the coil body, and a second winding channel is formed between the isolation rib and the pressure rib. The electromagnetic coil is wound in the first winding channel and the second winding channel to form a double-layer coil structure. The pressure rib and the isolation rib are staggered vertically, and the thickness of the pressure rib is greater than the thickness of the isolation rib.

[0010] In this invention, the insulating ribs, together with the surface of the disc, limit the inner coil within the first winding channel, while the pressure ribs, together with the insulating ribs, limit the outer coil within the second winding channel. This ensures the stability of the double-layer coil routing structure, reduces fluctuations in the current element position, and guarantees the stability of the magnetic field distribution. The pressure ribs and insulating ribs are staggered left and right, significantly increasing the overall width of each limiting structure compared to the traditional top-bottom aligned arrangement, thereby significantly improving the overall structural stability of the limiting structure. Simultaneously, the staggered design of the pressure ribs and insulating ribs ensures a single core-pulling direction in the mold, avoiding interference problems caused by top-bottom aligned layouts and improving demolding smoothness.

[0011] Furthermore, the thinner wall design of the insulating ribs enhances their elastic deformation capability. This flexibility allows them to deform under the pressure of the electromagnetic coil during winding, thus embedding the electromagnetic coil into the first winding channel. It also reduces the distance between the outer coil and the cookware, keeping the coupling distance within a highly efficient magnetic induction intensity range. Meanwhile, the thicker pressure ribs withstand the tension during electromagnetic coil winding, acting as a limit while clamping the inner and outer coils to ensure neat winding and maintain magnetic field stability.

[0012] The offset of the isolation bar relative to the pressure bar along the circumference of the disc is L, where L = 5mm - 10mm.

[0013] In this design, by offsetting the isolation ribs and pressure ribs relative to each other circumferentially (left-right offset), and considering their own width, the overall width of each set of limiting structures formed by them can reach 10-20mm. This is 30%-50% wider than the completely overlapping arrangement (width approximately 5-10mm), thus improving the overall structural stability of the limiting structure by more than 40%. Simultaneously, this structural design improves the smoothness of demolding by 60%.

[0014] The width of the isolation reinforcement bar shall not be less than the width of the pressure reinforcement bar.

[0015] In this design, the insulating rib serves a dual purpose: limiting the electromagnetic coils within both the first and second winding channels. Therefore, increasing the width of the insulating rib expands the limiting area for both the inner and outer electromagnetic coils, thus improving the limiting effect. Furthermore, since the insulating rib is relatively thin and has low structural strength, increasing its width increases its structural strength while maintaining the same thickness (keeping the coupling distance between the outer coil and the cookware constant). This ensures structural stability and reduces the risk of breakage during the winding of the inner coil. Conversely, the smaller width of the pressure rib reduces material usage while maintaining structural stability and the limiting effect on the electromagnetic coils, thereby saving costs.

[0016] The length of the isolation rib along the radial direction of the disc is greater than the length of the pressure rib along the radial direction of the disc, so that the number of turns of the electromagnetic coil in the first winding channel is greater than the number of turns in the second winding channel.

[0017] In this design, the use of pressure ribs and isolation ribs ensures that the inner and outer coils are well-positioned during and after winding, guaranteeing their regularity and tension, and preventing loosening. Furthermore, the isolation ribs are longer than the pressure ribs, making the second winding channel wider than the first winding channel in the radial direction of the coil body. This facilitates the outward offset of the inner coil relative to the outer coil during winding, achieving misalignment of the heating rings of the two coils.

[0018] The electromagnetic coil includes an inner coil wound in a first winding channel and an outer coil wound in a second winding channel. The area of ​​the inner coil is larger than that of the outer coil, so that the surface of the disk has an overlapping heating area where the inner and outer coils coincide, and an isolated heating area where the inner and outer coils are misaligned.

[0019] In this scheme, the inner and outer coils are each considered as current-carrying coils composed of countless current elements. When the inner and outer coils are staggered, the magnetic induction intensity generated by each current element in space is synthesized according to the principle of vector superposition. Furthermore, the region of stronger magnetic induction intensity generated by the current elements of the inner coil (heating ring) and the region of stronger magnetic induction intensity generated by the current elements of the outer coil (heating ring) are partially staggered in space, forming isolated heating regions, and partially overlap, forming overlapping heating regions. In the overlapping heating region, the magnetic induction intensity is the superposition of the magnetic induction induction intensity generated by each of the two coils, forming a strong magnetic field; in the isolated heating region, each coil still retains a portion of its own heating ring, thus maintaining a relatively strong magnetic induction intensity. At this point, the total heating ring area is the sum of the heating ring areas of the inner and outer coils minus the area of ​​the overlapping heating ring. Compared to a scheme where the two heating rings completely overlap, this significantly increases the total heating ring area, thereby increasing the heating area of ​​the cookware. This allows a larger area of ​​the cookware to be covered by the heating rings, improving the uniformity of heating and ensuring that food is heated more evenly in all areas, thus enhancing the taste and texture of the cooked food. Simultaneously, the larger heating area allows for a reduction in heating power or heating time, helping to lower energy consumption.

[0020] The disc body is also provided with a first shaping rib located on one side of the pressure line rib along the circumferential direction, and a second shaping rib located on the other side of the pressure line rib. The first shaping rib is fixed to the pressure line rib, and the second shaping rib is fixed to the isolation rib. The first shaping rib and the second shaping rib are arranged at an angle to form a bending angle.

[0021] In this design, the shaping ribs are used to restrict the winding shape of the electromagnetic coil, ensuring its regular shape and thus guaranteeing the stable position of each current element. Because the first and second shaping ribs form bending angles within the first and second winding channels, the electromagnetic coil bends at these angles, forming a corner and thus creating a polygonal shape for the entire coil. Compared to circular winding, the electromagnetic coil experiences higher tension at the bending angles, while the coil extends smoothly between the two bending angles with lower tension, making it easier to maintain a regular shape. Furthermore, in this design, the bending angles with higher tension are located directly below the pressure ribs and isolation ribs—the part of the electromagnetic coil that bends—and are aligned vertically with the limiting structure, receiving pressure and restraint from the limiting structure, thereby maintaining a relatively regular shape.

[0022] Multiple pressure ribs are spaced apart along the circumference of the disc body. Each pressure rib and the disc body are separated by an isolation rib. At least some of the isolation ribs are equipped with a hook structure, which forms a limiting groove for the conductor to pass through.

[0023] In this design, the two layers of electromagnetic coils in the first and second winding channels are wound with a single wire. The hook structure allows the outer coil to begin winding after the inner coil is wound via a limiting groove. The limiting groove ensures a smoother and more regular transition between the two coil layers, guaranteeing that the outer coil can be wound with sufficient tension after the inner coil is finished, thus improving the tension effect of both the inner and outer coil layers.

[0024] The electromagnetic wire reel also includes a magnetic strip support fixed to the reel body. The magnetic strip support is equipped with a magnetic strip, and the magnetic strip is staggered with the wire pressing ribs and the isolation ribs.

[0025] In this design, after the magnetic strip support is fixed to the reel body, the magnetic strip also functions as a pressing and limiting element for the electromagnetic coil. Thus, the magnetic strip, along with the pressure ribs and isolation ribs, jointly press and limit the electromagnetic coil. Furthermore, the limiting structure is staggered with the magnetic strip, meaning it presses different positions on the electromagnetic coil, resulting in a more dispersed and even pressing effect. This improves the limiting effect on the electromagnetic coil and makes the coil fit more closely and neatly to the reel body. Simultaneously, this design gives the magnetic strip more functions, simplifying the overall structure of the electromagnetic coil and saving costs.

[0026] The disc body includes a bottom wall, side walls, and an arc-shaped portion located between the bottom wall and the side walls. Pressure ribs and isolation ribs are provided on the bottom wall and the arc-shaped portion to form a first winding area on the bottom wall and a second winding area on the arc-shaped portion. The side wall is provided with a winding groove to form a third winding area.

[0027] The first winding area corresponds to the bottom wall of the upper pot, the third winding area corresponds to the side wall of the pot or the transition area between the side wall and the bottom wall, and the second winding area also corresponds to the transition area, so that the electromagnetic coils in the three winding areas can form a three-dimensional heating of the pot and improve the heat uniformity of the food in the pot.

[0028] The electromagnetic coil is wound in a double-layer dense winding structure in the first and second winding regions, and in a single-layer sparse winding structure in the third winding region.

[0029] In this design, the bottom wall and the curved edge of the cookware are the core heating areas. A multi-layered, densely wound structure allows for a greater number of coil turns within a limited area, significantly enhancing the magnetic field strength in the bottom wall and curved areas. This strong magnetic field induces stronger eddy currents at the bottom of the cookware, thereby significantly improving the heating power and efficiency in the central area. The double-layered winding structure fully utilizes vertical space, increasing the number of coil turns despite limited radial area. The loosely wound coils on the side walls provide an auxiliary magnetic field, helping to improve the heating uniformity of the side walls and bottom edge areas. Furthermore, since the side walls are not the core heating area, appropriately reducing the number of coil turns and the winding density allows for cost control while maintaining a certain heating effect. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0031] Figure 1 This is a cross-sectional view of an electromagnetic coil according to one embodiment of the present invention.

[0032] Figure 2 for Figure 1 A magnified view of area A in the middle;

[0033] Figure 3 This is a schematic diagram of the structure of an electromagnetic coil according to one embodiment of the present invention, wherein the magnetic strip support is not shown;

[0034] Figure 4 for Figure 3 A schematic diagram of the structure of the electromagnetic coil from another perspective;

[0035] Figure 5 for Figure 3 A schematic diagram of the structure of the electromagnetic coil from another perspective;

[0036] Figure 6 This is a schematic diagram of the structure of the disc body according to one embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of an electromagnetic coil according to one embodiment of the present invention.

[0038] in;

[0039] 1. Disc body; 11. Bottom wall; 111. First winding area; 112. Winding gap; 12. Arc-shaped part; 121. Second winding area; 13. Side wall; 131. Third winding area; 132. Wire separator rib; 133. Winding groove; 14. Wire pressing rib; 141. Second winding channel; 142. First rib position; 143. Second rib position; 15. Isolation rib; 151. First winding channel; 16. First shaping rib; 17. Second shaping rib; 171. Wire hook structure; 18. Overlapping heating area; 19. Isolated heating area;

[0040] 2. Electromagnetic coil; 21. Inner coil; 22. Outer coil;

[0041] 3. Magnetic strip support; 31. Magnetic strip; 311. First magnet; 312. Second magnet. Detailed Implementation

[0042] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0043] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0044] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this 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.

[0047] like Figure 1 , Figure 2 , Figure 6As shown, an electromagnetic coil for a cooking appliance includes a coil body 1, an electromagnetic coil 2 wound around the coil body 1, and a pressure rib 14 disposed on the coil body 1. An isolation rib 15 is also disposed between the pressure rib 14 and the coil body 1. A first winding channel 151 is formed between the isolation rib 15 and the coil body 1, and a second winding channel 141 is formed between the isolation rib 15 and the pressure rib 14. The electromagnetic coil 2 is wound in the first winding channel 151 and the second winding channel 141 respectively to form a double-layer coil structure. The pressure rib 14 and the isolation rib 15 are staggered vertically, and the thickness of the pressure rib 14 is greater than the thickness of the isolation rib 15.

[0048] In this invention, the isolation rib 15 can limit the inner coil 21 in the first winding channel 151 with the surface of the disc 1, and the pressure rib 14 can limit the outer coil 22 in the second winding channel 141 with the isolation rib 15, ensuring the stability of the double-layer coil routing structure, reducing the fluctuation of the current element position, and ensuring the stability of the magnetic field distribution. The pressure rib 14 and the isolation rib 15 are staggered left and right, which greatly increases the overall width of each limiting structure composed of the pressure rib 14 and the isolation rib 15 compared to the traditional top-bottom corresponding arrangement, thereby significantly improving the overall structural stability of the limiting structure. At the same time, the staggered design of the pressure rib 14 and the isolation rib 15 ensures a single mold core-pulling direction, avoiding interference problems caused by the top-bottom corresponding layout and improving the smoothness of mold release.

[0049] Furthermore, the thinner wall design of the insulating rib 15 enhances its elastic deformation capability, allowing it to deform under the pressure of the electromagnetic coil 2 during winding, thus embedding the electromagnetic coil 2 into the first winding channel 151. It also reduces the distance between the outer coil 22 and the cookware, keeping the coupling distance between them within a highly efficient magnetic induction intensity range. The thicker pressure rib 14 withstands the tension during the winding of the electromagnetic coil 2, acting as a limit while clamping the inner and outer coils 22, ensuring the neatness of the winding and guaranteeing magnetic field stability.

[0050] Preferably, in this invention, the disc body 1 is made of high-temperature resistant plastic material. The electromagnetic coil 2 is preferably wound with multi-strand enameled wire with a diameter of 0.1-0.3mm. The electromagnetic coil 2 is wound into a circle or polygon, and the number of turns of the inner and outer coils is adjusted according to the heating effect.

[0051] Preferably, the thickness of the insulating rib 15 is 1mm-3mm, and more preferably, it is 2mm thick. It is made of high-strength PET + 30% glass fiber material and has an elastic deformation range of 0.5mm-1mm. Tests have shown that at this thickness, the winding throughput of the insulating rib 15 is increased to over 99%. Furthermore, at this thickness, the distance between the outer coil 22 and the cookware is no more than 5mm (in traditional limiting rib structures, the distance between the outer coil 22 and the cookware is 6mm-8mm), further controlling the coupling distance between the electromagnetic coil 2 and the cookware to 3mm-5mm. According to the magnetic field coupling formula, at this distance, the magnetic field leakage rate is reduced to 3%-5% (compared to 8%-12% in traditional structures).

[0052] Preferably, the thickness of the pressure rib 14 is 3mm-6mm, and more preferably, it is 5mm. It is made of high-strength PET + 30% glass fiber material. According to the test, the bending strength of the pressure rib 14 at this thickness is ≥80MPa, which can withstand the tension of about 5N-8N when the electromagnetic coil 2 is wound. It plays a limiting role and clamps the inner and outer coils 22. After the actual winding is completed, the displacement of the electromagnetic coil 2 is ≤0.2mm, which is much lower than the 0.5mm-1mm of the traditional structure.

[0053] Preferably, such as Figure 6 As shown, there are multiple pressure ribs 14 and isolation ribs 15, which are spaced apart circumferentially along the disc body 1. Each pressure rib 14 and isolation rib 15 extends radially along the disc body 1. The end near the center of the disc body 1 is fixed to the disc body 1, and the end away from the center of the disc body 1 is free, so that the pressure rib 14 and isolation rib 15 can elastically deform around the connecting end to allow the coil to pass through.

[0054] According to the Biot-Savart law, the magnetic induction intensity of a coil is determined by the spatial distribution of its current elements. In this invention, through thickness design of the pressure ribs 14 and isolation ribs 15, as well as structural design, the positional deviation of the current elements in the inner and outer coils is controlled within 0.2mm. Calculations show that the fluctuation of the magnetic induction intensity is ≤5%, which is 67%-75% lower than that of the traditional structure (fluctuation reaches 15%-20%). The stable magnetic field controls the heating temperature difference of the cookware within 3℃-5℃, while the traditional structure is 8℃-12℃, improving heating uniformity by 40%-60%. Furthermore, the stable magnetic field and uniform heating reduce the rate of food burning to below 0.3% (compared to 5%-8% in the traditional structure). Taking steamed rice as an example, cooking experiments show that the moisture content deviation of the rice is ≤2% (compared to 4%-6% in the traditional structure), the softness and glutinousness of the texture is improved by 20%-30%, and the nutrient retention rate is increased by 5%-8%.

[0055] In a preferred embodiment of this utility model, the offset of the isolation rib 15 relative to the pressure rib 14 along the circumference of the disc body 1 is L, where L = 5mm-10mm.

[0056] By offsetting the isolation ribs 15 and pressure ribs 14 relative to each other (left and right) along the circumference of the disc body 1, and considering their own width, the overall width of each set of limiting structures formed by the two can reach 10-20mm. This is 30%-50% wider than the arrangement where they completely overlap vertically (width approximately 5-10mm), thus improving the overall structural stability of the limiting structure by more than 40%. Simultaneously, this structural design improves the smoothness of demolding by 60%.

[0057] Specifically, such as Figure 6 As shown, the pressure bar 14 and the isolation bar 15 have overlapping and misaligned portions in the vertical direction.

[0058] Preferably, such as Figure 6 As shown, the width of the isolation rib 15 is not less than the width of the pressure rib 14.

[0059] The insulating rib 15 serves a dual purpose: limiting the electromagnetic coil 2 within both the first winding channel 151 and the second winding channel 141. Therefore, increasing the width of the insulating rib 15 increases the limiting area for both the inner and outer electromagnetic coils 2, thus improving the limiting effect. Furthermore, since the insulating rib 15 is relatively thin and has low structural strength, increasing its width improves its structural strength while maintaining the same thickness (the coupling distance between the outer coil 22 and the cookware remains constant), thereby ensuring structural stability and reducing the risk of breakage during the winding of the inner coil 21. Conversely, the smaller width of the pressure rib 14 reduces material usage while maintaining structural stability and the limiting effect on the electromagnetic coil 2, thus saving costs.

[0060] As a preferred embodiment of this utility model, such as Figure 2 As shown, the length of the isolation rib 15 along the radial direction of the disc body 1 is greater than the length of the pressure rib 14 along the radial direction of the disc body 1, so that the number of turns of the electromagnetic coil 2 in the first winding channel 151 is greater than the number of turns in the second winding channel 141.

[0061] By setting the pressure ribs 14 and the isolation ribs 15, the inner coil 21 and the outer coil 22 are well constrained during and after winding, thus ensuring the regularity and tension of the inner coil 21 and the outer coil 22 and preventing loosening. Furthermore, the length of the isolation ribs 15 is greater than that of the pressure ribs 14, making the width of the second winding channel 141 in the radial direction of the disc 1 greater than that of the first winding channel 151. This facilitates the outward offset of the inner coil 21 relative to the outer coil 22 during winding, achieving misalignment of the heating rings of the two coils.

[0062] Furthermore, such as Figure 2 As shown, the electromagnetic coil 2 includes an inner coil 21 wound in the first winding channel 151 and an outer coil 22 wound in the second winding channel 141. The area of ​​the inner coil 21 is larger than the area of ​​the outer coil 22, so that the surface of the disk 1 has an overlapping heating area 18 where the inner coil 21 and the outer coil 22 overlap, and an isolated heating area 19 where the inner coil 21 and the outer coil 22 are misaligned.

[0063] The inner coil 21 and the outer coil 22 can be considered as current-carrying coils composed of countless current elements. When the inner and outer coils are staggered, the magnetic induction intensity generated by each current element in space is synthesized according to the principle of vector superposition. Furthermore, the region of stronger magnetic induction intensity (heating ring) generated by the current elements of the inner coil 21 and the region of stronger magnetic induction intensity (heating ring) generated by the current elements of the outer coil 22 are partially staggered in space, forming an isolated heating region 19, and partially overlap, forming an overlapping heating region 18. In the overlapping heating region 18, the magnetic induction intensity is the superposition of the magnetic induction induction intensity generated by each of the two coils, forming a strong magnetic field; in the isolated heating region 19, each coil still has a portion of its own heating ring, thus maintaining a relatively strong magnetic induction intensity. At this point, the total heating ring area is the sum of the heating ring areas of the inner coil 21 and the outer coil 22, minus the area of ​​the overlapping heating ring. Compared to a scheme where the two heating rings completely overlap, this significantly increases the total area of ​​the heating rings, thereby increasing the heating area of ​​the cookware. This allows a larger area of ​​the cookware to be covered by the heating rings, improving the uniformity of heating and ensuring more even heating of the food in each area, thus enhancing the cooking experience. Simultaneously, the larger heating area allows for a reduction in heating power or heating time, helping to lower energy consumption.

[0064] Specifically, such as Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the inner coil 21 is offset relative to the outer coil 22 in a direction away from the center of the disk body 1 along the radial direction of the disk body 1, so as to form an isolated heating zone 19 at the end of the inner coil 21 away from the center of the disk body 1.

[0065] Specifically, such as Figures 3 to 5 As shown, the centers of the inner coil 21 and the outer coil 22 are both located on the axis of the disk body 1, that is, the inner coil 21 and the outer coil 22 are concentric circles. The outer edge of the inner coil 21 is located outside the outer edge of the outer coil 22, thus forming an isolated heating zone 19.

[0066] Preferably, the inner coil 21 is offset outward by 5mm-20mm relative to the outer coil 22, thus shifting the heating ring of the inner coil 21 outward by 5mm-20mm relative to the heating ring of the outer coil 22. Using a certain model of electromagnetic coil for testing, the width of the central heating ring of the outer coil 22 was measured to be 25mm-30mm, and the width of the central heating ring of the inner coil 21 was also 25mm-30mm. Based on calculations using the Biot-Savart law and actual measurements, when the inner and outer coils are misaligned by 5mm-20mm, in the overlapping area, the magnetic induction intensity is the sum of the magnetic induction intensities generated by each coil, forming a strong magnetic field; in the non-overlapping areas of their respective rings, a relatively strong magnetic induction intensity is also maintained. At this point, the total heating ring area is the sum of the areas of the upper and lower heating rings minus the overlapping area. The overlapping area is only 20%-30% of the total area of ​​the two heating rings. Therefore, the total heating ring width reaches 40mm-50mm, which is 60%-100% larger than that of the traditional single-layer coil.

[0067] Further testing of the cooking effect revealed that, under the same heating power, the increased heating area resulted in a more even distribution of heat across the cookware, with temperature differences between different areas controlled within 5℃-8℃, compared to 15℃-20℃ for traditional coil cookware. This improved heating uniformity also ensures more even heating of the food within the cookware, preventing food from burning at the bottom due to high temperatures. Experiments verified that rice cooked in this electromagnetic coil rice cooker is soft, sticky, and with distinct grains, with a burning rate reduced to below 0.5%, compared to 5%-8% for traditional coil rice cookers. Due to the superior heating uniformity, there is no need to extend heating time or increase heating power to ensure thorough heating, resulting in energy savings of 10%-15% when cooking the same amount of rice.

[0068] This new electromagnetic coil utilizes more magnetic field energy for heating the cookware, resulting in an 8%-12% increase in energy conversion efficiency. Furthermore, the more uniform heating reduces the total energy input required to achieve the desired cooking effect. Under the same cooking conditions, rice cookers using traditional single-layer or double-layer coils typically achieve an energy efficiency rating of Level 2, while those using this new electromagnetic coil exceed Level 1, meeting higher energy efficiency standards. This saves users long-term operating costs and aligns with the social trend towards energy conservation and environmental protection.

[0069] In one embodiment, the inner coil 21 can be offset outward relative to the outer coil 22, that is, the inner diameter of the inner coil 21 is larger than the inner diameter of the outer coil 22, and the outer diameter is also larger than the outer diameter of the outer coil 22. As a result, isolated heating areas 19 are formed at one end near the center of the bottom wall 11 of the disk body 1 and at the other end away from the center of the disk body 1, and an overlapping heating area 18 is formed between the two.

[0070] As a preferred embodiment, such as Figure 2 As shown, the diameter of the inner coil 21 is larger than the diameter of the outer coil 22. The inner coil 21 has a first proximal end near the center of the disk body 1, and the outer coil 22 has a second proximal end near the center of the disk body 1. The first and second proximal ends are flush.

[0071] Since the center of the cookware is where the food gathers, the inner coil 21 and the outer coil 22 are flush with each other at the end near the center of the pan body 1 to form an overlapping heating area 18. The magnetic fields of the two are superimposed here, which can specifically improve the heating effect on the central area of ​​the cookware, so that more heat is concentrated in the central area of ​​the cookware. In the edge area of ​​the cookware, the heating is carried out by the magnetic field formed independently by the inner coil 21, so that the heat distribution is more adapted to the distribution of the food, improves the rationality of heat distribution, and helps to save costs while ensuring heating efficiency.

[0072] In a preferred embodiment, such as Figures 4 to 6 As shown, the disc body 1 is also provided with a first shaping rib 16 located on one side of the pressure rib 14 along the circumferential direction, and a second shaping rib 17 located on the other side of the pressure rib 14. The first shaping rib 16 is fixed to the pressure rib 14, and the second shaping rib 17 is fixed to the isolation rib 15. The first shaping rib 16 and the second shaping rib 17 are arranged at an angle to form a bending angle.

[0073] The shaping ribs are used to restrict the winding shape of the electromagnetic coil 2, ensuring its regular shape and thus ensuring the stable position of each current element. Because the first shaping rib 16 and the second shaping rib 17 form bending angles within the first winding channel 151 and the second winding channel 141, the electromagnetic coil 2 bends at these angles, forming a corner and thus the electromagnetic coil 2 is arranged in a polygonal shape. Compared to circular winding, the electromagnetic coil 2 experiences greater tension at the bending angles, while the coil 2 extends smoothly between the two bending angles with less tension, making it easier to maintain a regular posture. Furthermore, in this design, the bending angles where the electromagnetic coil 2 experiences greater tension are located below the pressure rib 14 and the isolation rib 15, i.e., the part where the electromagnetic coil 2 bends. These points are aligned vertically with the limiting structure and are pressed and limited by the limiting structure, thus maintaining a relatively regular posture. This allows the limiting structure to specifically limit the bending position of the electromagnetic coil 2, ensuring that the electromagnetic coil 2 is wound in a regular polygonal shape, greatly improving the overall yield of the electromagnetic coil, and ensuring the stability and reliability of the magnetic field generated by the electromagnetic coil 2, thus guaranteeing heating efficiency.

[0074] Furthermore, the shaping ribs are located near the pressure ribs 14 and 15, which allows them to enhance each other's structural strength. Since the pressure ribs 14 and 15 are fixed at the near end and free at the far end, during the winding process, the pressure ribs 14 and 15 will swing up and down around the near end under the compression of the coil. Therefore, the near end is subjected to greater force. Through the structural strengthening effect of the shaping ribs, the structural strength of the pressure ribs 14 and 15 at the near end can be improved, reducing the risk of breakage of the pressure ribs 14 and 15, and further improving the product yield.

[0075] Of course, the first shaping rib 16 and the second shaping rib 17 can also work together to form an arc surface so that the electromagnetic coil 2 can be wound along the arc surface to form a circular structure, which is not limited here.

[0076] Specifically, such as Figure 6 As shown, from this perspective, the pressure reinforcement 14 is offset to the right by a certain distance relative to the isolation reinforcement 15 and is fixedly connected to the first shaping reinforcement 16 on the right side, while the isolation reinforcement 15 is fixedly connected to the second shaping reinforcement 17 on the left side. This not only improves the structural strength of the isolation reinforcement 15 and the pressure reinforcement 14 by utilizing the shaping reinforcements, but also simplifies the structure and reduces processing difficulty through the proximity of the connections.

[0077] Preferably, such as Figure 4 As shown, multiple pressure ribs 14 are arranged at intervals along the circumference of the disc body 1. Each pressure rib 14 and the disc body 1 are provided with an isolation rib 15. At least some of the isolation ribs 15 are provided with a hook structure 171, which forms a limiting groove for the wire to pass through.

[0078] The two layers of electromagnetic coils 2 in the first winding channel 151 and the second winding channel 141 are wound with a single wire. The hook structure 171 allows the outer coil 22 to be wound after the inner coil 21 is wound, via the limiting groove. Under the limiting action of the limiting groove, the transition between the two coil layers is smoother and more regular, ensuring that the outer coil 22 can be wound with sufficient tension after the inner coil 21 is wound, thus improving the tension effect of the inner and outer coil layers.

[0079] It should be noted that, as Figure 4 , Figure 5 As shown, the number of pressure ribs 14 determines the number of polygonal corners in the winding of the electromagnetic coil 2. Preferably, the polygon has 5-8 bends. More preferably, as... Figures 4 to 6As shown, there are six pressure ribs 14, evenly arranged along the circumference of the disc body 1, so that the electromagnetic coil 2 is wound in a hexagonal shape. The electromagnetic coil 2 extends smoothly in the area between two adjacent pressure ribs 14, and can extend in a straight line or in an arc, without limitation. Specifically, the pressure ribs 14 include first rib positions 142 located on the bottom wall 11 and second rib positions 143 located on the arc-shaped portion 12. The number of second rib positions 143 is not less than the number of first rib positions 142, for example... Figure 5 As shown, there are 5 first rib positions 142 and 6 second rib positions 143.

[0080] Preferably, such as Figure 7 As shown, the electromagnetic coil also includes a magnetic strip support 3 fixed to the coil body 1. The magnetic strip support 3 is equipped with a magnetic strip 31, which is staggered from the wire pressing rib 14 and the isolation rib 15.

[0081] After the magnetic strip bracket 3 is fixed to the disc body 1, the magnetic strip 31 can also press and limit the electromagnetic coil 2. Thus, the magnetic strip 31, together with the pressure rib 14 and the isolation rib 15, press and limit the electromagnetic coil 2. The limiting structure is staggered with the magnetic strip 31, pressing different positions of the electromagnetic coil 2 respectively. This makes the pressing position of the electromagnetic coil 2 more dispersed and even, improving the limiting effect and making the electromagnetic coil 2 fit more neatly and correctly with the disc body 1. At the same time, it gives the magnetic strip 31 more functions, simplifying the overall structure of the electromagnetic coil and saving costs.

[0082] As a preferred embodiment of this utility model, such as Figure 1 , Figures 3 to 5 , Figure 7 As shown, the disc body 1 includes a bottom wall 11, a side wall 13, and an arcuate portion 12 located between the bottom wall 11 and the side wall 13. The wire pressing rib 14 and the isolation rib 15 are disposed on the bottom wall 11 and the arcuate portion 12 to form a first winding area 111 on the bottom wall 11 and a second winding area 121 on the arcuate portion 12. The side wall 13 is provided with a winding groove 133 to form a third winding area 131.

[0083] Specifically, such as Figures 4 to 6 As shown, the pressure rib 14 includes a first rib position 142 disposed on the bottom wall 11 and a second rib position 143 disposed on the arc-shaped portion 12. Isolation ribs 15 are provided between the first rib position 142 and the bottom wall 11, and between the second rib position 143 and the arc-shaped portion 12. This ensures that the electromagnetic coil 2 forms a double-layer winding structure in both the first winding region 111 and the second winding region 121.

[0084] The magnetic strip 31 includes a first magnet 311 and a second magnet 312. The first magnet 311 corresponds to the first winding area 111 and is used to press and limit the electromagnetic coil 2 in the first winding area 111. It is also offset from the first rib 142. The second magnet 312 corresponds to the second winding area 121 and is used to press and limit the electromagnetic coil 2 in the second winding area 121. It is also offset from the second rib 143.

[0085] The first winding area 111 corresponds to the bottom wall 11 of the upper pot, the third winding area 131 corresponds to the side wall 13 of the pot or the transition area between the side wall 13 and the bottom wall 11, and the second winding area 121 also corresponds to the transition area, so that the electromagnetic coils 2 in the three winding areas can form a three-dimensional heating of the pot and improve the uniformity of heating of the food in the pot.

[0086] It should be noted that this invention does not limit the winding method of the electromagnetic coil 2 in the three winding regions. In one embodiment, three sets of electromagnetic coils 2 are wound separately in the first winding region 111, the second winding region 121, and the third winding region 131, so that the electromagnetic coils 2 in the three regions can be heated independently. In another embodiment, one set of electromagnetic coils 2 is wound separately in the first winding region 111, and another set of electromagnetic coils 2 is wound together in the second winding region 121 and the third winding region 131, so that the electromagnetic coils 2 in the second winding region 121 and the third winding region 131 can be heated together.

[0087] Furthermore, such as Figure 3 , Figure 4 As shown, the electromagnetic coil 2 is wound in a double-layer dense winding structure in the first winding region 111 and the second winding region 121, and the electromagnetic coil 2 is wound in a single-layer sparse winding structure in the third winding region 131.

[0088] The bottom wall 11 and the arc-shaped portion 12 at the edge of the bottom wall 11 are the core heating areas. A multi-layered, densely wound structure allows for a greater number of coil turns within a limited area, significantly enhancing the magnetic field strength in the bottom wall 11 and arc-shaped portion 12. This strong magnetic field induces stronger eddy currents at the bottom of the pot, thus significantly improving the heating power and efficiency in the central area of ​​the pot bottom. The double-layered winding structure fully utilizes vertical space, increasing the number of coil turns despite limited radial area. The loosely wound coils on the side wall 13 provide a certain auxiliary magnetic field, helping to improve the heating uniformity of the side wall 13 and the edge area of ​​the bottom wall 11. Furthermore, since the side wall 13 is not a core heating area, appropriately reducing the number of coil turns and the winding density allows for cost control while maintaining a certain heating effect.

[0089] Specifically, such as Figure 6As shown, the third winding area 131 is provided with a plurality of spacer ribs 132 arranged at intervals along the height direction of the disk body 1. A winding groove 133 is formed between adjacent spacer ribs 132. The single wire of the electromagnetic coil 2 is located in the winding groove 133 so that the upper and lower turns of wire do not contact each other, forming a loose winding structure.

[0090] like Figure 4 As shown, a winding gap 112 is provided between the electromagnetic coil 2 in the first winding region 111 and the electromagnetic coil 2 in the second winding region 121, as well as between the electromagnetic coil 2 in the second winding region 121 and the electromagnetic coil 2 in the third winding region 131.

[0091] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0092] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0093] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An electromagnetic coil for a cooking utensil, comprising a coil body, an electromagnetic coil wound around the coil body, and pressure ribs disposed on the coil body, characterized in that, An isolation rib is also provided between the pressure rib and the disc body. The isolation rib and the disc body form a first winding channel, and the isolation rib and the pressure rib form a second winding channel. The electromagnetic coil is wound in the first winding channel and the second winding channel respectively to form a double-layer coil structure. The pressure rib and the isolation rib are staggered vertically, and the thickness of the pressure rib is greater than the thickness of the isolation rib.

2. The electromagnetic coil for cooking appliances according to claim 1, characterized in that, The offset of the isolation rib relative to the pressure rib along the circumference of the disc body is L, where L = 5mm-10mm.

3. The electromagnetic coil for cooking appliances according to claim 1, characterized in that, The width of the isolation reinforcement bar is not less than the width of the pressure bar.

4. The electromagnetic coil for cooking appliances according to claim 1, characterized in that, The length of the isolation rib along the radial direction of the disc is greater than the length of the pressure rib along the radial direction of the disc, so that the number of turns of the electromagnetic coil in the first winding channel is greater than the number of turns in the second winding channel.

5. The electromagnetic coil for cooking appliances according to claim 4, characterized in that, The electromagnetic coil includes an inner coil wound in the first winding channel and an outer coil wound in the second winding channel. The area of ​​the inner coil is larger than the area of ​​the outer coil, so that the surface of the disk has an overlapping heating area where the inner coil and the outer coil coincide, and an isolated heating area where the inner coil and the outer coil are misaligned.

6. The electromagnetic coil for cooking appliances according to claim 1, characterized in that, The disc body is also provided with a first shaping rib located on one side of the pressure rib along the circumferential direction, and a second shaping rib located on the other side of the pressure rib. The first shaping rib is fixed to the pressure rib, and the second shaping rib is fixed to the isolation rib. The first shaping rib and the second shaping rib are arranged at an angle to form a bending angle.

7. The electromagnetic coil for cooking appliances according to claim 6, characterized in that, Multiple pressure ribs are spaced apart along the circumference of the disc body. Each pressure rib and the disc body are provided with an isolation rib. At least some of the isolation ribs are provided with a hook structure, and the hook structure forms a limiting groove for the wire to pass through.

8. The electromagnetic coil for cooking appliances according to claim 1, characterized in that, The electromagnetic wire reel also includes a magnetic strip support fixed to the reel body. The magnetic strip support is equipped with a magnetic strip, which is offset from the pressure rib and the isolation rib.

9. The electromagnetic coil for cooking appliances according to claim 1, characterized in that, The disc body includes a bottom wall, a side wall, and an arc-shaped portion located between the bottom wall and the side wall. The pressure ribs and the isolation ribs are disposed on the bottom wall and the arc-shaped portion to form a first winding area on the bottom wall and a second winding area on the arc-shaped portion. The side wall is provided with a winding groove to form a third winding area.

10. The electromagnetic coil for cooking appliances according to claim 9, characterized in that, The electromagnetic coil is wound in a double-layer dense winding structure in the first winding region and the second winding region, and the electromagnetic coil is wound in a single-layer sparse winding structure in the third winding region.

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