Uniformly heated large diameter coil panel

Abstract

The utility model provides a kind of large size diameter heating coil disc of uniform heating, wherein the large size diameter heating coil disc of uniform heating includes a coil disc support, a coil winding and a magnetic strip, wherein the coil winding is set to one side of the coil disc support and is distributed in the radial direction sparsely and alternately on the side of the coil disc support, wherein the magnetic strip is set to the other side of the coil disc support, to make the magnetic flux of the large size diameter heating coil disc of uniform heating dispersed based on the winding along radial direction sparsely and alternately distributed, which is beneficial to improve the magnetic field uniformity of middle magnetic field and edge magnetic field.

Description

Technical Field

[0001] This utility model relates to the field of household appliances, and in particular to a large-diameter heating coil that provides uniform heating. Background Technology

[0002] An induction cooker is a device that converts electrical energy into heat energy using the principle of electromagnetic induction. Current induction cookers typically have a heating coil consisting of a base and a heating coil formed by tightly wound copper strands wound clockwise or counterclockwise around the base. Currently, the diameter of the heating coil is generally limited to less than 6 inches. This is because the strength of the magnetic field generated by the heating coil gradually decreases from the center to the periphery during operation. Therefore, even increasing the diameter of the heating coil cannot produce a large-area heating effect. When large cookware is placed on the heating coil, a phenomenon of high temperature in the center and low temperature at the periphery occurs. The uniformity of the magnetic field distribution has become a technical barrier to expanding the size of the heating coil.

[0003] To increase the area of ​​the coil disk with a given number of coil turns, refer to... Figure 1 As shown, a schematic diagram of an induction cooker coil structure disclosed in Chinese Utility Model Patent Publication No. CN203219533U is presented. The induction cooker coil structure includes a coil support 10, coil windings 20 disposed on the upper part of the coil support 10, and magnetic strips 30 radially disposed on the lower part of the coil support 10. In the coil windings 20, the distance between adjacent coils and the coil support gradually increases from the inside to the outside along the diameter direction. The coil windings are wound in a sparse manner with a large spacing, which is sufficient to cover more than 80% of the area of ​​the cookware, solving the problem of insufficient heating at the bottom and top of the cookware. However, this technical solution cannot solve the problem of uneven magnetic field distribution in the middle and outer edge areas of the coil. When large-sized cookware is placed on the induction cooker coil structure, although the induction cooker coil structure can cover the large-sized cookware, it cannot form a uniform heating effect on the large-sized cookware.

[0004] Therefore, existing induction cookers cannot achieve uniform heating of large cookware. On the one hand, the existing 6-inch heating coil cannot cover the bottom of large cookware, resulting in the edges of large cookware not being covered by the heating coil and thus lacking a heat source. On the other hand, even if designers increase the diameter of the heating coil to enlarge the cooktop, the magnetic field strength generated by the heating coil gradually decreases from the center to the periphery. In fact, the heating intensity of large cookware is weaker at the edges compared to the center, and the larger the size, the more obvious the magnetic field attenuation becomes, failing to achieve uniform heating. Compared to smaller heating coils, this offers no significant advantage and also results in a waste of resources.

[0005] Based on the above factors, many consumers still prefer gas stoves, especially professional chefs in the catering industry. Induction cookers, due to their limited size, cannot replace gas stoves in achieving even cooking results. This is particularly true for techniques like reducing sauces over high heat, where efficient and even heat distribution is crucial, and existing induction cookers cannot meet these needs. Furthermore, existing induction cookers are prone to localized overheating in the central area, affecting the final cooking outcome. Utility Model Content

[0006] One objective of this invention is to provide a large-diameter heating coil plate with uniform heating, wherein the large-diameter heating coil plate has a diameter of 8 inches or more to meet the cooking needs of large-sized kitchen utensils.

[0007] Another objective of this invention is to provide a large-diameter heating coil that provides uniform heating. This large-diameter heating coil can achieve uniform heating while maintaining a large diameter, thus meeting the requirement for uniform heating of large-sized kitchen utensils.

[0008] Another objective of this invention is to provide a large-diameter heating coil with uniform heating, wherein the large-diameter heating coil with uniform heating can improve the uniformity of magnetic field distribution, thereby breaking the size limitations of existing coils and setting the size to 8 inches or more to meet market demand.

[0009] Another objective of this invention is to provide a large-diameter heating coil with uniform heating. The large-diameter heating coil with uniform heating adopts a coil winding method with alternating sparse and dense coils to disperse the magnetic flux and improve the uniformity of the magnetic field distribution. This ensures that the bottom of the kitchenware is heated evenly when using eddy current heating for large-sized kitchenware.

[0010] Another objective of this invention is to provide a large-diameter heating coil with uniform heating, wherein the large-diameter heating coil with uniform heating is guided by magnetic strips to diffuse the central heating field to the edge heating field, thereby further improving the heating uniformity of the large-diameter heating coil with uniform heating.

[0011] Another objective of this invention is to provide a large-diameter heating coil with uniform heating. The large-diameter heating coil with uniform heating includes a coil support, a coil winding, and a magnetic strip. The coil winding is disposed on one side of the coil support and is distributed with alternating density along the radial direction on that side. The magnetic strip is disposed on the other side of the coil support. Based on the alternating density of the winding along the radial direction, the magnetic flux of the large-diameter heating coil with uniform heating is dispersed, which is beneficial to improving the magnetic field uniformity between the central magnetic field and the edge magnetic field.

[0012] Another objective of this invention is to provide a large-diameter heating coil with uniform heating, wherein the coil winding has at least three winding zones distributed radially outward from its physical center point, wherein there is a winding gap between two adjacent winding zones, and wherein the windings of the coil winding are distributed in each winding zone and spaced apart by the winding gap, thereby forming a structure in which the coil windings are alternately distributed in the radial direction, which is beneficial to the dispersion of magnetic flux, so that the large-diameter heating coil with uniform heating can overcome the size limitations of the prior art and be set in a size of 8 inches or more.

[0013] Another objective of this invention is to provide a large-diameter heating coil with uniform heating, wherein the magnetic strip has an inner end located in the middle of the coil support and is configured to extend outward from the inner end along the radial direction of the large-diameter heating coil with uniform heating, and wherein the other end of the magnetic strip extends from the magnet to the other side of the coil support and protrudes from the magnet, so that the magnetic strip extends to the outer edge of the large-diameter heating coil with uniform heating, thereby guiding the central heating field to diffuse to the edge heating field, further improving the heating uniformity of the large-diameter heating coil with uniform heating.

[0014] Another objective of this invention is to provide a large-diameter heating coil with uniform heating, wherein the magnetic strip further extends from the inner end to the other side of the coil support with a central protrusion to further enhance the guiding effect of the central heating field to the outer edge heating field, thereby improving the uniformity of heating inside and outside the large-diameter heating coil.

[0015] Another objective of this invention is to provide a large-diameter heating coil with uniform heating. Based on the partitioned design of the coil winding, even when the corresponding kitchen utensils are small, such as 3-inch diameter utensils, the large-diameter heating coil with uniform heating can achieve good heating effect based on the winding area in the middle. Thus, the large-diameter heating coil with uniform heating is suitable for both large and small kitchen utensils, improving its practicality.

[0016] Another objective of this invention is to provide a large-diameter heating coil with uniform heating, wherein the windings of each of the winding areas are connected in series. The large-diameter heating coil with uniform heating includes a data acquisition circuit and a control circuit. The data acquisition circuit is used to acquire the current of the coil winding. The current varies when the number of winding areas covered by the coil winding is different. The control circuit controls the power of the coil winding according to the acquisition structure of the data acquisition circuit, thereby maximizing the heating power of containers of different diameters and ensuring uniform heating at the bottom of the container.

[0017] Another objective of this invention is to provide a large-diameter heating coil with uniform heating, wherein each of the winding regions has at least two turns of winding and the gap between two adjacent winding regions is greater than the diameter of the winding, thereby enabling the magnetic flux to be dispersed to achieve uniform heating and ensuring the heating effect in each winding region.

[0018] Another objective of this invention is to provide a large-diameter heating coil with uniform heating, wherein the winding gap between two adjacent winding areas is less than five times the diameter of the winding wire, so as to ensure the dispersion of magnetic flux and avoid the winding from being too dispersed, which would affect the heating effect.

[0019] Another objective of this invention is to provide a large-diameter heating coil with uniform heating, wherein there are multiple magnetic strips, which are divided into long magnetic strips and short magnetic strips according to the length of the magnet. The inner end of the long magnetic strip is located in the first turn of the coil winding corresponding to the coil coil support, and the inner end of the short magnetic strip is located in the coil coil support corresponding to one of the winding gaps. This distribution of long and short magnetic strips further improves the heating uniformity of the large-diameter heating coil with uniform heating.

[0020] Another objective of this invention is to provide a large-diameter heating coil with uniform heating, wherein a plurality of magnetic strips are arranged on the coil support in a state in which the long magnetic strips and the short magnetic strips are alternately distributed along the circumferential direction of the large-diameter heating coil with uniform heating, thereby facilitating the increase of the magnetic field density of the outer coil winding and the balanced magnetic field distribution based on the distribution of the short magnetic strips.

[0021] According to one aspect of the present invention, a large-diameter heating coil with uniform heating is provided, wherein the large-diameter heating coil with uniform heating comprises:

[0022] One coil support;

[0023] A coil winding, wherein the coil winding has at least three winding regions spaced radially outward from its physical center point, wherein a winding gap exists between two adjacent winding regions, wherein the windings of the coil winding are concentrically wound in each winding region and spaced apart from the winding gap, wherein each turn of winding in each winding region is concentric; and

[0024] A magnetic strip, wherein the magnetic strip is disposed on the other side of the coil disk support.

[0025] In one embodiment, each of the winding regions has at least two turns of wire and the gap between two adjacent winding regions is greater than the wire diameter.

[0026] In one embodiment, the winding gap between two adjacent winding regions is less than five times the diameter of the winding.

[0027] In one embodiment, the diameter of the winding is greater than or equal to 0.15 mm and less than or equal to 0.25 mm.

[0028] In one embodiment, the number of winding areas is four. The four winding areas are named, respectively, a first winding area, a second winding area, a third winding area, and a fourth winding area, radiating outwards from the center of the uniformly heated large-diameter heating coil. The winding gap between the first and second winding areas is named the first winding gap, the winding gap between the second and third winding areas is named the second winding gap, and the winding gap between the third and fourth winding areas is named the third winding gap. The first winding area has five to nine turns of winding, and the width of the first winding gap is less than twice the diameter of the winding wire. The second winding area has two to four turns of winding, and the width of the second winding gap is greater than three times the diameter of the winding wire. The third winding area has one to three turns of winding, and the width of the third winding gap is less than twice the diameter of the winding wire. The fourth winding area has three to seven turns of winding.

[0029] In one embodiment, the magnetic strip has an inner end located in the middle of the coil support and is configured to extend outward from the inner end along the radial direction of the uniformly heated large-diameter heating coil, wherein the other end of the magnetic strip extends from the magnet to the other side of the coil support and protrudes from the magnet.

[0030] In one embodiment, the number of magnetic strips is multiple, and the multiple magnetic strips are divided into long magnetic strips and short magnetic strips according to the length of the magnet. The inner end of the long magnetic strip is disposed in the first turn of the coil winding corresponding to the coil winding of the coil disc support, and the inner end of the short magnetic strip is disposed in the coil disc support corresponding to one of the winding gaps.

[0031] In one embodiment, a plurality of magnetic strips are disposed on the coil support in a manner in which the long magnetic strips and the short magnetic strips are alternately distributed along the circumferential direction of the large-diameter heating coil for uniform heating.

[0032] In one embodiment, the long magnetic strip is divided into a first long magnetic strip and a second long magnetic strip, wherein the second long magnetic strip further includes, relative to the first long magnetic strip, a central protruding section extending from the inner end toward the other side of the coil support, wherein the central protruding section protrudes from the inner end toward the first turn of the coil winding.

[0033] In one embodiment, the first long magnetic strip and the second long magnetic strip are alternately distributed along the circumferential direction of the uniformly heated large-diameter heating coil, and the short magnetic strip is disposed between the first long magnetic strip and the second long magnetic strip.

[0034] The further objectives and advantages of this invention will become fully apparent from the following description and accompanying drawings. Attached Figure Description

[0035] Figure 1 This is an induction cooker coil disclosed in existing patent literature.

[0036] Figure 2 This is a schematic diagram of a large-diameter heating coil with uniform heating according to an embodiment of the present invention from a perspective.

[0037] Figure 3 This is a structural schematic diagram of the large-diameter heating coil with uniform heating according to the above embodiment of the present invention from another perspective.

[0038] Figure 4A This is a schematic diagram of the structure of a type of magnetic strip of a large-diameter heating coil disk with uniform heating according to the above embodiments of the present invention.

[0039] Figure 4B This is a schematic diagram of the structure of a type of magnetic strip of a large-diameter heating coil disk with uniform heating according to the above embodiments of the present invention.

[0040] Figure 4C This is a schematic diagram of the structure of a type of magnetic strip of a large-diameter heating coil disk with uniform heating according to the above embodiments of the present invention. Detailed Implementation

[0041] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0042] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," 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, the above terms should not be construed as limitations on this utility model.

[0043] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0044] Refer to the accompanying drawings in the specification of this utility model. Figure 2 and Figure 3 According to an embodiment of the present invention, a large-diameter heating coil 100 with uniform heating is shown. The large-diameter heating coil 100 with uniform heating is provided with a diameter of 8 inches or more and can achieve uniform heating while achieving a large diameter, thereby meeting the requirement of uniform heating for large-sized kitchen utensils.

[0045] Specifically, the large-diameter heating coil 100 with uniform heating includes a coil winding 10, a coil support 20, and a magnetic strip 30. The coil winding 10 is disposed on one side of the coil support 20 and is distributed alternately in density along the radial direction on that side. The magnetic strip 30 is disposed on the other side of the coil support 20. Based on the alternating density of the winding in the radial direction, the magnetic flux of the large-diameter heating coil 100 with uniform heating is dispersed, which helps to improve the magnetic field uniformity between the central magnetic field and the edge magnetic field. Thus, when using large-sized kitchen utensils for eddy current heating, the bottom of the kitchen utensils is heated evenly.

[0046] refer to Figure 2The coil winding 10 has at least three winding regions distributed radially outward from its physical center point, wherein there is a winding gap between two adjacent winding regions. The windings of the coil winding 10 are distributed in each winding region and spaced apart by the winding gap, thereby forming a structure in which the coil winding 10 is alternately distributed in the radial direction. This is beneficial for dispersing the magnetic flux, so that the large-diameter heating coil disk 100 with uniform heating can overcome the size limitations of the prior art and be set with a size of 8 inches or more.

[0047] It is worth mentioning that the coil winding 10 is concentrically wound in each of the winding areas, thereby forming multiple turns of winding at intervals. When energized, each turn of winding forms a heating area for the cookware, and the magnetic flux is dispersed in each of the winding areas based on the interval distribution of the multiple turns of winding, avoiding the magnetic flux from concentrating in the central area of ​​the coil winding 10, which is conducive to achieving uniform heating of the cookware.

[0048] Specifically, in this embodiment of the present invention, the number of winding areas is four. Starting from the center of the uniformly heated large-diameter heating coil 100, the four winding areas are named, respectively, first winding area 11, second winding area 12, third winding area 13, and fourth winding area 14, in a radial direction outwards. The winding gap between the first winding area 11 and the second winding area 12 is named first winding gap 101, the winding gap between the second winding area 12 and the third winding area 13 is named second winding gap 102, and the gap between the third winding area 13 and the fourth winding area 14 is named third winding gap 101. 03. When large-sized kitchen utensils are used to cover all winding areas, the first winding area 11, the second winding area 12, the third winding area 13, and the fourth winding area 14 respectively generate alternating magnetic fields. Based on the winding gaps left by the first winding gap 101, the second winding gap 102, and the third winding gap 103, the magnetic lines of force are diffused to the surrounding areas, avoiding the magnetic flux from being concentrated in the middle region of the coil winding 10. This is conducive to forming a more uniform magnetic flux in the first winding area 11, the second winding area 12, the third winding area 13, and the fourth winding area 14, so that the corresponding kitchen utensils can be heated evenly.

[0049] It is worth mentioning that each of the winding regions has at least two turns of winding, and the gap between two adjacent winding regions is greater than the wire diameter. This ensures the heating effect of each winding region based on the multiple turns of winding, and the gap, which is greater than the wire diameter, ensures that the magnetic lines of force can diffuse and achieve uniform heating.

[0050] Specifically, the winding gap between two adjacent winding regions is less than five times the diameter of the winding wire to ensure the dispersion of magnetic flux while avoiding excessive dispersion of the winding wire, which would affect the heating effect.

[0051] Specifically, in this embodiment of the present invention, the first winding area 11 has five to nine turns of winding, the width of the first winding gap 101 is greater than one time the diameter of the winding and less than twice the diameter of the winding; the second winding area 12 has two to four turns of winding, the width of the second winding gap 102 is greater than three times the diameter of the winding and less than five times the diameter of the winding; the third winding area 13 has one to three turns of winding, the width of the third winding gap 103 is greater than one time the diameter of the winding and less than twice the diameter of the winding; and the fourth winding area 14 has three to seven turns of winding.

[0052] Corresponding to Figure 2 As shown, the first winding area 11 has seven concentric turns of wire, with a winding area spaced one turn apart to form the first winding gap 101. The second winding area 12 is further formed by three concentric turns of wire, with a winding area spaced three turns apart to form the second winding gap 102. The third winding area 13 is further formed by two concentric turns of wire, with a winding area spaced one turn apart to form the third winding gap 103. The fourth winding area 14 is further formed by five concentric turns of wire.

[0053] In other words, corresponding to Figure 2 The structure shown has a coil winding 10 with 22 concentric windings, wherein the first to seventh windings form the first winding area 11, the eighth winding is left empty to form the first winding gap 101, the ninth to eleventh windings form the second winding area 12, the twelfth to fourteenth windings are left empty to form the second winding gap 102, the fifteenth and sixteenth windings form the third winding area 13, the seventeenth winding is left empty to form the third winding gap 103, and the eighteenth to twenty-second windings form the fourth winding area 14, for a total of 17 windings, each winding having the same center.

[0054] It is worth mentioning that the diameter of the winding wire is greater than or equal to 0.15mm and less than or equal to 0.25mm, and each turn of the winding wire in each winding area is tightly wound. The tightly wound winding can be a winding method in which two adjacent turns of the winding wire are tightly attached together, or a winding method in which two adjacent turns of the winding wire are wound with a small gap between them. The gap between two tightly wound turns of the winding wire is less than the diameter of the winding wire.

[0055] In particular, to further understand this utility model, this utility model also provides a coil winding method, see reference. Figure 2The coil winding method includes the following steps:

[0056] S1. Wrap the wire concentrically from the inside out five to nine times to form a first winding zone 11;

[0057] S2. A gap of one to two times the diameter of the winding is formed to form a first winding interval 101, and two to four turns of winding are continued to be wound outward concentrically to form a second winding area 12.

[0058] S3. A gap of three to five times the diameter of the winding wire is formed to form a second winding interval 102, and one to three turns of winding wire are continued to be wound outward concentrically to form a third winding area 13.

[0059] S4. A gap of one to two times the diameter of the winding is formed to create a third winding interval 103, and three to seven concentric turns of winding are continued outward to form a fourth winding area 14.

[0060] It is worth mentioning that the windings of each of the winding areas are connected in series, and the large-diameter heating coil 100 with uniform heating further includes a data acquisition circuit and a control circuit. The data acquisition circuit is used to acquire the current of the coil winding. The current is different when the number of winding areas covered by the coil winding is different. The control circuit controls the power of the coil winding according to the acquisition structure of the data acquisition circuit, so as to maximize the heating power of containers with different diameters and ensure uniform heating at the bottom of the container.

[0061] For example, when using large-sized cookware, the bottom of the cookware covers each of the winding areas. The acquisition circuit identifies the coverage of each winding area by collecting the current of the coil winding. The control circuit determines that a large-sized cookware is being used and drives it with high power, for example, controlling a programmable pulse generator (PPG) to output wide pulses to drive the IGBT and heat the cookware with high power. When using small-sized cookware, such as a 3-inch diameter cookware, the bottom of the cookware covers the middle winding area. The acquisition circuit identifies the coverage of each winding area by collecting the current of the coil winding. When it is identified as a small-sized cookware, it drives the middle winding area, such as the first winding area 11 and the second winding area 12, to heat it. In other words, the large-diameter heating coil 100 with uniform heating is suitable for both large-sized and small-sized cookware, improving the practicality of the large-diameter heating coil 100 with uniform heating.

[0062] It is worth mentioning that, in this embodiment of the present invention, the size of the coil winding 10 is set to 10 inches. Based on the setting of the present invention, the heating uniformity is ensured under the large diameter structure of 10 inches. Therefore, in specific implementation, stove products of 13 to 13.5 inches can be launched to meet the market demand for reliable large diameter induction cookers.

[0063] Furthermore, referring to the accompanying drawings in the specification of this utility model... Figures 3 to 4C The magnetic strip 30 has an inner end 301 located in the middle of the coil support 20 and is configured to extend outward from the inner end 301 along the radial direction of the uniformly heated large-diameter heating coil 100. The other end 303 of the magnetic strip 30 extends from the magnet 302 to the other side of the coil support 20 (i.e., the side where the coil winding 10 is located) and protrudes from the magnet 302, so that the magnetic strip 30 extends to the outer edge of the uniformly heated large-diameter heating coil 100, thereby guiding the central heating field to diffuse to the edge heating field, and further improving the heating uniformity of the uniformly heated large-diameter heating coil 100.

[0064] Specifically, this invention also enhances the density of the magnetic strips 30 by distributing the alternating long and short magnetic strips 30 on the coil support 20, thereby increasing the magnetic field strength of the uniformly heated large-diameter heating coil 100. Specifically, the number of magnetic strips 30 is multiple, and these multiple magnetic strips are divided into long magnetic strips 31 and short magnetic strips 32 according to the length of the magnet. The inner end 301 of the long magnetic strip 31 is positioned within the first turn of the coil winding 10 on the coil support 20, and the inner end 301 of the short magnetic strip 32 is positioned at a position corresponding to one of the winding gaps on the coil support 20. Specifically, in this embodiment of the invention, the inner end 301 of the short magnetic strip 32 is positioned at a position corresponding to the second winding gap 102 on the coil support 20, thereby further improving the heating uniformity of the uniformly heated large-diameter heating coil 100 based on the distribution of long and short magnetic strips.

[0065] It is worth mentioning that multiple magnetic strips 30 are arranged on the coil support 20 in a state where the long magnetic strips 31 and the short magnetic strips 32 are alternately distributed along the circumferential direction of the large-diameter heating coil 100 that is heated evenly. This is beneficial to improve the magnetic field density of the outer coil winding and balance the magnetic field distribution based on the distribution of the short magnetic strips 32.

[0066] Specifically, the long magnetic strip 31 is divided into a first long magnetic strip 311 and a second long magnetic strip 312, for comparison with reference. Figure 4A and Figure 4BThe second long magnetic strip 321 further includes a central protrusion 304 extending from the inner end 301 toward the other side of the coil support 20 relative to the first long magnetic strip 311. This corresponds to the state in which the second long magnetic strip 321 is disposed on one side of the coil support 20. The central protrusion 304 protrudes from the inner end 301 toward the first turn of the coil winding 10 on the other side of the coil support 20, thereby improving the effect of the magnetic strip 30 diffusing from the central heating field of the uniformly heated large-diameter heating coil 100 to the outer edge.

[0067] It is worth mentioning that, for reference Figure 3 The first long magnetic strip 311 and the second long magnetic strip 312 are alternately distributed along the circumferential direction of the uniformly heated large-diameter heating coil 100, and the short magnetic strip 32 is disposed between the first long magnetic strip 311 and the second long magnetic strip 312, for example, with Figure 3 Starting from the 12 o'clock position, the magnetic strips 30 are arranged clockwise as follows: the second long magnetic strip 312, the short magnetic strip 32, the first long magnetic strip 311, the short magnetic strip 32, the second long magnetic strip 312, the short magnetic strip 32, the first long magnetic strip 311, the short magnetic strip 32, the second long magnetic strip 312, the short magnetic strip 32, the first long magnetic strip 311, the short magnetic strip 32, the second long magnetic strip 312, the short magnetic strip 32, the first long magnetic strip 311, and the short magnetic strip 32, for a total of 16 magnetic strips 30. This enhances the magnetic field density of the uniformly heated large-diameter heating coil 100 and guides the heating field in the center of the uniformly heated large-diameter heating coil 100 to diffuse outwards, thereby improving the uniform heating effect of the uniformly heated large-diameter heating coil 100.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., 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 the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A large-diameter heating coil for uniform heating, characterized in that: include: One coil support; A coil winding, wherein the coil winding is disposed on one side of the coil disk support, the coil winding having at least three winding regions spaced radially outward from its physical center point, wherein a winding gap exists between two adjacent winding regions, wherein the windings of the coil winding are concentrically wound in each winding region and spaced apart from the winding gap, wherein each turn of winding in the winding region is concentric; and A magnetic strip is disposed on the other side of the coil support. The magnetic strip has an inner end located in the middle of the coil support and is configured to extend outward from the inner end along the radial direction of the uniformly heated large-diameter heating coil. The other end of the magnetic strip extends from the magnet toward one side of the coil support and protrudes from the magnet. The number of magnetic strips is plurality of them, and the plurality of magnetic strips are divided into long magnetic strips and short magnetic strips according to the length of the magnet. The inner end of the long magnetic strip is disposed on the first turn of the corresponding coil winding of the coil support. The inner end of the short magnetic strip is positioned at a location corresponding to one of the winding gaps in the coil support. Multiple magnetic strips are arranged on the coil support in a manner where long and short magnetic strips are alternately distributed along the circumferential direction of the uniformly heated large-diameter heating coil. The long magnetic strip is divided into a first long magnetic strip and a second long magnetic strip. The second long magnetic strip, relative to the first long magnetic strip, further includes a central protruding section extending from the inner end toward one side of the coil support. This central protruding section protrudes from the inner end toward the first turn of the coil winding.

2. The large-diameter heating coil with uniform heating according to claim 1, wherein each of the winding regions has at least two turns of winding and the winding gap between two adjacent winding regions is greater than the wire diameter of the winding.

3. The large-diameter heating coil with uniform heating according to claim 2, wherein the winding gap between two adjacent winding areas is less than five times the diameter of the winding wire.

4. The large-diameter heating coil with uniform heating according to claim 3, wherein the diameter of the winding wire is greater than or equal to 0.15 mm and less than or equal to 0.25 mm.

5. The uniformly heated large-diameter heating coil according to claim 4, wherein the number of winding areas is four, wherein the four winding areas are named as a first winding area, a second winding area, a third winding area, and a fourth winding area respectively from the center of the uniformly heated large-diameter heating coil outward in the radial direction, and the winding gap between the first winding area and the second winding area is named the first winding gap, the winding gap between the second winding area and the third winding area is named the second winding gap, and the winding gap between the third winding area and the fourth winding area is named the third winding gap, wherein the first winding area has five to nine turns of winding, and the width of the first winding gap is less than twice the diameter of the winding wire, the second winding area has two to four turns of winding, and the width of the second winding gap is greater than three times the diameter of the winding wire, the third winding area has one to three turns of winding, and the width of the third winding gap is less than twice the diameter of the winding wire, and the fourth winding area has three to seven turns of winding.

6. The uniformly heated large-diameter heating coil according to any one of claims 1 to 5, wherein the first long magnetic strip and the second long magnetic strip are alternately distributed along the circumferential direction of the uniformly heated large-diameter heating coil, and the short magnetic strip is disposed between the first long magnetic strip and the second long magnetic strip.

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