Coil disk assembly and electromagnetic heating device

Abstract

The present application relates to the technical field of electromagnetic heating. Disclosed are a coil disk assembly and an electromagnetic heating device. The coil disk assembly comprises a support and at least one pair of winding units, each winding unit is annularly shaped and has a first winding segment close to the center of the support and a second winding segment close to the edge of the support, and in one pair of winding units, the current directions of the two winding units are set to be opposite, so that opposite magnetic poles are formed in the middles of the two winding units.

Description

Coil assembly and electromagnetic heating device

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202421388735.1, filed on June 17, 2024, and Chinese patent application No. 202421388759.7, filed on June 17, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of electromagnetic heating technology, and in particular to a coil assembly and an electromagnetic heating device. Background Technology

[0004] Conventional induction cooker coils have a single-ring spiral winding structure. Their heating effect on cookware is limited by their own physical electromagnetic field, and the heat is concentrated inward. When the item to be heated is a wok, the heat cannot be concentrated on the pot wall due to the large distance between the coils on the side walls, resulting in poor heating of the pot wall. Even if the diameter of the coil is increased, it is difficult to increase the heat of the pot wall. Summary of the Invention

[0005] The main purpose of this application is to propose a coil assembly and an electromagnetic heating device, which aims to solve the problem that existing induction cookers have poor heating effect on the pot wall, and it is difficult to increase the heat of the pot wall even if the coil diameter is increased.

[0006] To achieve the above objectives, the coil assembly proposed in this application includes:

[0007] stents; and,

[0008] At least one pair of winding units, each pair of winding units includes two winding units disposed on the bracket and distributed along the circumference of the bracket, each of the winding units being arranged in a ring, having a first winding loop segment near the center of the bracket and a second winding loop segment near the edge of the bracket;

[0009] In the pair of winding units, the current directions of the two winding units are set to be opposite, so that opposite magnetic poles are formed in the middle of the two winding units, and in at least one of the winding units, the width of at least a portion of the first winding loop segment is d1, and the width of at least a portion of the second winding loop segment is d2, wherein d1 is greater than d2.

[0010] This application also provides a coil disk assembly, including:

[0011] stents; and,

[0012] At least one pair of winding units, each pair of winding units includes two winding units disposed on the bracket and distributed along the circumference of the bracket, each of the winding units being arranged in a ring, having a first winding loop segment near the center of the bracket and a second winding loop segment near the edge of the bracket;

[0013] In the pair of winding units, the current directions of the two winding units are set to be opposite, so that opposite magnetic poles are formed in the middle of the two winding units, and in at least one of the winding units, the winding center of the winding unit is located on the side of its geometric center close to the second winding loop segment.

[0014] In one embodiment, at least a portion of the winding gap of the first winding loop segment is greater than the winding gap of the second winding loop segment.

[0015] In one embodiment, the support is provided with a winding structure for the winding unit to wind, the winding structure comprising:

[0016] The first winding portion includes a plurality of first winding grooves formed on one side of the bracket;

[0017] The second winding portion defines a second winding groove with its opening facing the periphery of the bracket; and,

[0018] The first winding loop segment is correspondingly disposed in the plurality of first winding slots, and the second winding loop segment is confined to the second winding slot.

[0019] In one embodiment, the support is provided with a winding structure for the winding unit to wind, the winding structure comprising:

[0020] At least two third winding portions are spaced apart in a direction outward from the center of the bracket, and each third winding portion defines a third winding groove with its opening facing the periphery of the bracket; and,

[0021] The fourth winding portion defines a fourth winding groove with its opening facing the periphery of the bracket; and,

[0022] Wherein, a portion of the first winding loop segment is confined to one of the third winding slots, another portion of the first winding loop segment is confined to another of the third winding slots, and the second winding loop segment is confined to the fourth winding slot.

[0023] In one embodiment, the number of layers of the winding unit at the first winding loop segment is N1, and the number of layers of the winding unit at the second winding loop segment is N2, wherein N2 is greater than N1.

[0024] In one embodiment, the first winding loop segment protrudes from both ends toward the middle section near the center of the bracket.

[0025] In one embodiment, the included angle formed at the bend of the first winding loop segment is A, where 80°≤A≤100°.

[0026] In one embodiment, at least 3 / 4 turns of the coil in the winding unit are wound in the same direction.

[0027] In one embodiment, the plurality of winding units are arranged in series or in parallel.

[0028] In one embodiment, in a pair of said winding units, the two winding units include:

[0029] A first winding unit has a first input terminal, a first winding, and a first output terminal. The first winding is wound outwards from the first input terminal in a first clockwise direction. The first output terminal is connected to the outer end of the first winding.

[0030] The second winding unit has a second input terminal, a second winding, and a second output terminal. The second winding is wound outward from the second input terminal along a second clockwise direction opposite to the first clockwise direction. The second output terminal is connected to the outer end of the second winding.

[0031] In one embodiment, the coil assembly further includes a magnet structure comprising two magnetic end portions disposed at the middle of two of the two winding units in a pair of winding units, and an extension portion located between the two magnetic end portions.

[0032] In one embodiment, the two magnetic end portions and the extension portion are integrally disposed; or,

[0033] The extension includes two connecting portions that are integrally formed with the two magnetic end portions.

[0034] In one embodiment, the coil assembly further includes a shielding structure, the shielding structure including a first shielding portion disposed on the side of the winding unit facing the support.

[0035] In one embodiment, the shielding structure further includes a second shielding portion disposed around each pair of winding units.

[0036] In one embodiment, the material of at least a portion of the shielding structure includes one of ferrite, nanocrystals, and silicon steel sheets.

[0037] This application also provides an electromagnetic heating device, including a coil assembly, the coil assembly comprising:

[0038] stents; and,

[0039] At least one pair of winding units, each pair of winding units includes two winding units disposed on the bracket and distributed along the circumference of the bracket, each of the winding units being arranged in a ring, having a first winding loop segment near the center of the bracket and a second winding loop segment near the edge of the bracket;

[0040] In the pair of winding units, the current directions of the two winding units are set to be opposite, so that opposite magnetic poles are formed in the middle of the two winding units, and in at least one of the winding units, the width of at least a portion of the first winding loop segment is d1, and the width of at least a portion of the second winding loop segment is d2, wherein d1 is greater than d2.

[0041] This application also provides an electromagnetic heating device, including a coil assembly, the coil assembly comprising:

[0042] stents; and,

[0043] At least one pair of winding units, each pair of winding units includes two winding units disposed on the bracket and distributed along the circumference of the bracket, each of the winding units being arranged in a ring, having a first winding loop segment near the center of the bracket and a second winding loop segment near the edge of the bracket;

[0044] In the pair of winding units, the current directions of the two winding units are set to be opposite, so that opposite magnetic poles are formed in the middle of the two winding units, and in at least one of the winding units, the winding center of the winding unit is located on the side of its geometric center close to the second winding loop segment.

[0045] In the technical solution provided in this application, the coil assembly includes a support and multiple winding units. The multiple winding units are disposed on the support and are distributed circumferentially along the support. Each winding unit is arranged in a ring and has a first winding loop segment near the center of the support and a second winding loop segment near the edge of the support. In a pair of winding units, the current directions of the two winding units are set to be opposite so that opposite magnetic poles are formed in the middle of the two winding units, thereby forming a closed magnetic field between the two winding units. In at least one winding unit, the magnetic pole formed in its middle is close to the side of the corresponding second winding loop segment, so that the magnetic field can couple with the corresponding pot wall from the side near the edge of the support, increasing the heating range of the pot wall and improving the uniformity of heating the bottom and wall of the pot. This solves the problem that existing induction cookers have poor heating effect on the pot wall, and it is difficult to increase the heat of the pot wall even if the coil diameter is increased. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0047] Figure 1 is a perspective structural schematic diagram of an embodiment of the coil disk assembly provided in this application;

[0048] Figure 2 is a schematic diagram of the coil assembly and cookware shown in Figure 1;

[0049] Figure 3 is a schematic diagram of multiple winding units in Figure 1;

[0050] Figure 4 is a schematic diagram of the current direction after multiple winding units in Figure 3 are energized;

[0051] Figure 5 is a partial structural schematic diagram of the coil disk assembly in Figure 1;

[0052] Figure 6 is a schematic diagram of the coil disk assembly in Figure 1 from another perspective;

[0053] Figure 7 is a top view of the coil assembly in Figure 6;

[0054] Figure 8 is a schematic diagram of the magnetic field formed by each pair of winding units in Figure 1;

[0055] Figure 9 is a structural schematic diagram of another embodiment of the coil disk assembly provided in this application;

[0056] Figure 10 is a cross-sectional schematic diagram of the coil disk assembly in Figure 9;

[0057] Figure 11 is a plan view of the coil assembly addressed in this application;

[0058] Figure 12 is a schematic diagram of a partial structure of the coil disk assembly provided in this application;

[0059] Figure 13 is a three-dimensional schematic diagram of the coil disk assembly provided in this application;

[0060] Figure 14 is a three-dimensional schematic diagram of multiple winding units in Figure 13;

[0061] Figure 15 is a schematic diagram of multiple winding units, the first temperature measuring element, and the second temperature measuring element in Figure 13;

[0062] Figure 16 is a plan view of an embodiment of the multiple winding units in Figure 13;

[0063] Figure 17 is a plan view of another embodiment of the multiple winding units in Figure 13.

[0064] Explanation of icon numbers:

[0065] 100. Coil assembly; 1. Bracket; 11. Second winding section; 12. Third winding section; 13. Fourth winding section; 2. Winding unit; 201. First winding loop segment; 202. Second winding loop segment; 21. First winding unit; 211. First input terminal; 212. First winding; 213. First output terminal; 22. Second winding unit; 221. Second input terminal; 222. Second winding; 223. Second output terminal; 3. Shielding structure; 31. First shielding section; 41. Magnetic extreme end section; 42. Extension section; a. First non-wiring area; b. Second non-wiring area; 2011. Side; 5. First temperature sensing element; 6. Second temperature sensing element;

[0066] 200. Cookware; 2001. Bottom of the pot; 2002. The side of the pot.

[0067] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0068] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0069] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0070] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0071] Conventional induction cooker coils have a single-ring spiral winding structure. Their heating effect on cookware is limited by their own physical electromagnetic field, and the heat is concentrated inward. When the item to be heated is a wok, the heat cannot be concentrated on the pot wall due to the large distance between the coils on the side walls, resulting in poor heating of the pot wall. Even if the diameter of the coil is increased, it is difficult to increase the heat of the pot wall.

[0072] To address this technical problem, this application provides a coil assembly to solve the issue of poor heating effect of existing induction cookers on the pot wall, where even increasing the coil diameter does not significantly increase the heat output of the pot wall.

[0073] Please refer to Figures 1 to 4. In a coil assembly 100 provided in this application, the coil assembly 100 includes a support 1 and at least a pair of winding units 2. Each pair of winding units 2 includes two winding units 2 disposed on the support 1 and distributed along the circumference of the support 1. Each winding unit 2 is arranged in a ring and has a first winding loop segment 201 near the center of the support 1 and a second winding loop segment 202 near the edge of the support 1. In the pair of winding units 2, the current directions of the two winding units 2 are set to be opposite, so that opposite magnetic poles are formed in the middle of the two winding units 2. In at least one of the winding units 2, the width of at least a portion of the first winding loop segment 201 is d1, and the width of at least a portion of the second winding loop segment 202 is d2, wherein d1 is greater than d2.

[0074] In another coil assembly 100 provided in this application, the coil assembly 100 includes a support 1 and at least a pair of winding units 2. Each pair of winding units 2 includes two winding units 2 disposed on the support 1 and distributed circumferentially along the support 1. Each winding unit 2 is arranged in a ring and has a first winding loop segment 201 near the center of the support 1 and a second winding loop segment 202 near the edge of the support 1. In the pair of winding units 2, the current directions of the two winding units 2 are set to be opposite, so that opposite magnetic poles are formed in the middle of the two winding units 2. In at least one of the winding units 2, the winding center of the winding unit 2 is located on the side of its geometric center near the second winding loop segment 202.

[0075] It should be noted that in the existing technology, the conventional coil is set as a circular spiral winding structure, and the gap between two adjacent windings is uniform and the same. When the conventional coil is coupled with the cookware, especially the wok type, the shape of the wok limits the distance between the side wall and the bottom of the cookware. As a result, the magnetic field density of the coil is relatively small, and the heating efficiency is low.

[0076] It should be noted that the shapes of the winding units 2 in the "multiple winding units 2" mentioned in this application can be the same or different. Each winding unit 2 is formed by winding multiple turns of coil. Each turn of coil in each winding unit 2 can be regarded as a ring structure. Of course, the ring structure is not limited to being circular; it can be square or elliptical. Each winding unit 2 can be laid flat along a surface area, which can be a plane or a curved surface. Each winding unit 2 can also be bent. The specifics can be determined according to the actual situation, and the embodiments in this specification do not limit this.

[0077] "The plurality of winding units 2 are distributed along the circumference of the bracket 1" can mean that the plurality of winding units 2 are distributed in a ring on the same side of the bracket 1, or that some winding units 2 are located on one side of the bracket 1 and other winding units 2 are located on the other side of the bracket 1. However, as long as they are distributed in a ring on the projection surface of the bracket 1, they can be regarded as "the plurality of winding units 2 are distributed along the circumference of the bracket 1".

[0078] "Current direction" refers to the direction in which the current of the winding unit 2 flows clockwise or counterclockwise. "The current directions of the two winding units 2 are set to be opposite" means that when the current direction of one winding unit 2 is clockwise, the current direction of the other winding unit 2 is counterclockwise.

[0079] It should be noted that, according to Ampere's law: if you hold a current-carrying solenoid with your right hand and point your four fingers in the direction of the current, then the end pointed to by your thumb is the N pole of the current-carrying solenoid. Thus, as shown in Figure 8, when the current directions of the two winding units 2 are set to opposite, a closed magnetic field is formed between the two winding units 2. For example, one of the two winding units 2 is set as the first winding unit and the other as the second winding unit. When the first winding unit and the second winding unit are laid flat in the horizontal direction, the N pole is formed on the upper side of the first winding unit and the S pole is formed on the lower side. At the same time, the S pole is formed on the upper side of the second winding unit and the N pole is formed on the lower side. In this way, the magnetic field lines run from the N pole of the first winding unit to the S pole of the second winding unit, then from the S pole of the second winding unit to the N pole, then from the N pole of the second winding unit to the S pole of the first winding unit, and then from the S pole of the first winding unit back to the N pole of the first winding unit, thus forming a closed magnetic field.

[0080] Therefore, when a pair of winding units 2 are energized, the closed magnetic field formed between the two irregular magnetic poles formed by the two winding units 2 can couple with the pot wall which is far away from the winding unit 2, thereby heating the pot wall.

[0081] The "width" in "at least a portion of the width of the first winding loop segment 201 is d1, at least a portion of the width of the second winding loop segment 202 is d2, and d1 is greater than d2" refers to the distance between the innermost coil and the outermost coil in the multi-turn coil of the winding unit 2, in the direction outward from the geometric center of the winding unit 2. Specifically, as shown in Figure 7, this can be achieved by reducing the winding length in the corresponding area of ​​the second winding loop segment 202; or by setting the winding gap of the first winding loop segment 201 to be greater than that of the second winding loop segment 202 when adjacent winding segments in the first and second winding loop segments are arranged in parallel. Of course, when adjacent winding segments in each winding loop segment are not arranged in parallel, the winding gap will be uneven, but other winding segments can be adaptively adjusted to ultimately achieve d1 greater than d2.

[0082] "The winding center of the winding unit 2 is located on the side of its geometric center close to the second winding loop segment 202", which can be achieved by setting the winding unit 2 into a fan-shaped, triangular, or other shape, and adjusting the shape of the winding unit 2 to achieve the adjustment of the geometric center.

[0083] Understandably, according to Ampere's law, the magnetic poles formed by the winding unit 2 correspond to the inner ring region of the ring. When "d1 is greater than d2" or "the winding center is located on the side of its geometric center close to the second winding ring segment 202", the magnetic poles of the corresponding winding unit 2 are formed in the region close to the support and the outer periphery, thereby achieving the largest possible heating range for the pot wall.

[0084] Of course, the specific ways to make the width of the first winding loop segment 201 greater than the width of the second winding loop segment 202, and to make the winding center of the winding unit 2 located on the side of its geometric center close to the second winding loop segment 202, are not limited to the examples above. Those skilled in the art may make other changes under the guidance of the technical essence of the embodiments in this specification. However, as long as the functions and effects achieved are the same as or similar to those in the embodiments of this specification, they should all be covered within the protection scope of the embodiments of this specification.

[0085] In the technical solution provided in this application, by placing the magnetic pole formed in the middle of at least one winding unit 2 close to the side of the corresponding second winding ring segment 202, the magnetic pole formed in the middle of the winding unit 2 can be closer to the edge of the support 1, and can be coupled with the position of the corresponding pot wall 2002, thereby increasing the heating range of the pot wall 2002 and improving the uniformity of heating the bottom 2001 and the pot wall 2002 of the cookware 200. This solves the problem that the existing induction cooker has poor heating effect on the pot wall, and it is difficult to increase the heat of the pot wall even if the diameter of the coil is increased.

[0086] Furthermore, to ensure that the magnetic fields generated by the first winding loop segment 201 and the second winding loop segment 202 are uniform, and that the cookware 200 is heated evenly, in this embodiment, at least a portion of the winding gap of the first winding loop segment 201 is larger than the winding gap of the second winding loop segment 202. With this configuration, only the winding gap of the second winding loop segment 202 needs to be adjusted to make it denser. This ensures that while the magnetic field generated by the second winding loop segment 202 is greater than that generated by the first winding loop segment 201, the magnetic field within the range generated by the second winding loop segment 202 can be distributed more uniformly, resulting in uniform heating of the area acting on the cookware wall 2002.

[0087] Specifically, in one embodiment, referring to FIG1, the bracket 1 is provided with a winding structure for the winding unit 2 to be wound. The winding structure includes a first winding portion and a second winding portion 11. The first winding portion includes a plurality of first winding grooves formed on one side of the bracket 1. The second winding portion 11 and the bracket 1 define a second winding groove with the groove opening facing the periphery of the bracket 1. The first winding loop segment 201 is correspondingly provided in the plurality of first winding grooves, and the second winding loop segment 202 is limited to the second winding groove.

[0088] Thus, on the bracket 1, the first winding loop segment 201 can be loosely wound in the first winding groove, and the second winding loop segment 202 can be side-wound and confined in the first winding groove.

[0089] Specifically, in another embodiment, please refer to Figures 9 and 10. The bracket 1 is provided with a winding structure for the winding unit 2 to be wound. The winding structure includes at least two third winding portions 12 and a fourth winding portion 13. The at least two third winding portions 12 are spaced apart in the direction outward from the center of the bracket 1. Each third winding portion 12 defines a third winding groove with its opening facing the periphery of the bracket 1 between itself and the bracket 1. The fourth winding portion 13 defines a fourth winding groove with its opening facing the periphery of the bracket 1 between itself and the bracket 1. The first winding loop segment 201 is partially located in one of the third winding grooves, another part of the first winding loop segment 201 is located in another third winding groove, and the second winding loop segment 202 is located in the fourth winding groove.

[0090] Thus, on the bracket 1, the first winding loop segment 201 can be partially wound in one of the third winding slots using a side-winding method, and the other part can also be wound in another of the third winding slots using a side-winding method. The second winding loop segment 202 can also be confined in the fourth winding slot using a side-winding method. In order to make the magnetic field density generated by the first winding loop segment 201 less than the magnetic field density generated by the second winding loop segment 202, the distance between the two third winding slots can be increased, thereby making the width of the first winding loop segment 201 less than the width of the second winding loop segment 202.

[0091] Furthermore, in one embodiment of this application, the number of layers of the winding unit 2 at the first winding loop segment 201 is N1, and the number of layers of the winding unit 2 at the second winding loop segment 202 is N2, wherein N2 is greater than N1.

[0092] Since the winding unit 2 is arranged in a ring, the number of coils in the first winding ring segment 201 and the second winding ring segment 202 is the same. When N2 is greater than N1, it can be understood that the second winding ring segment 202 is higher than the first winding ring segment 201 in height. Therefore, the second winding ring segment 202 can also be smaller than the first winding ring segment 201 in width, so that the magnetic pole formed in the middle of the winding unit 2 is close to the side of the corresponding second winding ring segment 202.

[0093] Furthermore, in the embodiments of this application, the first winding loop segment 201 is arranged to protrude from both ends toward the middle section near the center of the bracket 1.

[0094] It should be noted that "protrusion" means that it protrudes further towards the center than the arcs at both ends of the first winding loop segment 201. With this setting, multiple first winding loop segments 201 protrude in a direction that is close to each other, thereby avoiding the formation of a weak magnetic field area in the inner area formed by multiple winding units 2.

[0095] In practical applications, when the cookware is too small to cover the area corresponding to the second winding loop 202, cookware of different diameters can all heat the area where the first winding loop 201 is located.

[0096] Furthermore, in the embodiments of this application, the included angle formed at the bend of the first winding loop segment 201 is A, where 80°≤A≤100°.

[0097] Heating of the pot bottom 2001 is achieved by the magnetic field induction area generated by the close proximity of the wire segments of two adjacent winding units 2 and the pot 200. If the included angle A is too large, the number of winding units 2 will decrease accordingly, and the number of magnetic field induction areas will also decrease. This will result in poor heating efficiency of the pot 200 and poor heating uniformity of the pot bottom 2001.

[0098] If the included angle A is too small, the distance between the two bent segments of the first winding loop segment 201 will be relatively close, and the current directions of the two bent segments will tend to be reversed in the radial direction of the bracket 1. The magnetic field of the first winding loop segment 201 itself will be reduced, and the energy efficiency will be reduced.

[0099] Furthermore, in the embodiments of this application, at least 3 / 4 turns of the coil in the winding unit 2 are arranged in the same winding direction.

[0100] It is understandable that when the cookware 200 is placed, food is more likely to gather at the bottom of the cookware 200 in the area required for cooking. With this arrangement, the area of ​​the heating zone formed by the multiple first winding loop segments 201 in the middle of the corresponding support 1 is larger than the area of ​​the annular heating zone formed by the multiple second winding loop segments 202 at the edge of the corresponding support 1, so that the coil assembly 100 can be better suited for real-world cooking scenarios.

[0101] In this embodiment, the multiple winding units 2 are arranged in series or in parallel.

[0102] When multiple winding units 2 are arranged in series, the current direction of adjacent winding units 2 can be reversed when energized simply by adjusting the winding direction. Specifically, referring to Figures 4 and 7, in one embodiment, two adjacent winding units 2 include a first winding unit 21 and a second winding unit 22. The first winding unit 21 has a first input terminal 211, a first winding 212, and a first output terminal 213. The first winding 212 is wound outward from the first input terminal 211 in a first clockwise direction, and the first output terminal 213 is connected to the outer end of the first winding 212. The second winding unit 22 has a second input terminal 221, a second winding 222, and a second output terminal 223. The second winding 222 is wound outward from the second input terminal 221 in a second clockwise direction opposite to the first clockwise direction, and the second output terminal 223 is connected to the outer end of the second winding 222. Thus, the winding method is simple and convenient for production and processing.

[0103] When multiple winding units 2 are arranged in parallel, each winding unit 2 can be individually controlled to energize. This not only allows for reverse current directions between adjacent winding units 2, but also enables flexible control of the current direction in special scenarios, making electrical control more flexible and convenient. Furthermore, if some winding units 2 fail, the others remain unaffected and continue to operate normally.

[0104] Specifically, in this embodiment, two adjacent winding units 2 are riveted, welded, or screwed together to ensure stable connection and conduction between the multiple winding units 2. Of course, other possible connection methods can also be used, and the specific method can be determined according to the actual situation. This embodiment does not limit this.

[0105] Furthermore, in an embodiment of this application, the coil assembly 100 further includes a magnet structure, which includes two magnetic end portions 41 disposed at the middle of the two winding units in a pair of winding units, and an extension portion 42 located between the two magnetic end portions 41.

[0106] The two magnetic extreme ends 41 of the magnet structure allow more magnetic flux to pass through the magnetic circuit, reducing magnetic leakage, changing the path of the magnetic circuit, and making the magnetic field more concentrated and evenly distributed in the required area, thereby improving the efficiency and performance of the magnetic circuit. It can also increase the strength of the magnetic field in the middle of the two winding units, further improving the energy efficiency of the coupling with the cookware.

[0107] Specifically, in one embodiment, the two magnetic end portions 41 and the extension portion 42 are integrally disposed; since two different magnetic poles can be formed at the two ends of a magnet, each magnetic pole corresponds to the middle of a corresponding winding unit 2, and since the magnetic poles formed in the middle of the two winding units 2 in a pair of winding units 2 are disposed differently on the same side, the strength of the magnetic field of the two winding units can be enhanced by only setting one magnet, so as to minimize the number of parts.

[0108] In another embodiment, the extension 42 includes two connecting portions that are integrally formed with the two magnetic end portions 41. In this way, by setting the two magnets in segments, the strength of the magnetic field of the two winding units can be enhanced, and more arrangement forms can be provided to adapt to more application scenarios of coils.

[0109] Further, referring to Figures 6 and 7, in this embodiment, the coil assembly 100 further includes a shielding structure 3, which includes a first shielding portion 31 disposed on the side of the winding unit 2 facing the bracket 1.

[0110] Thus, the first shielding part 31, with its good magnetic permeability, helps to concentrate magnetic lines of force, thereby improving the heating power and efficiency of the coil assembly 100. Simultaneously, it isolates the electronic components located below the coil assembly 100 from the coil's magnetic field, ensuring their reliability. When the induction cooker with the coil assembly 100 is used on a metal surface, it prevents the magnetic field below from heating the metal surface at the bottom of the cooker.

[0111] Furthermore, the shielding structure 3 also includes a second shielding portion disposed around each pair of winding units. Since the magnetic pole formed in the middle of the winding unit 2 is close to one side of the corresponding second winding loop segment, the magnetic field near the periphery of the coil assembly 100 will be correspondingly enhanced. To prevent electromagnetic interaction between the winding unit 2 and magnetically conductive tools and objects around the coil assembly 100, which could cause accidental heating, the second shielding portion effectively achieves magnetic field shielding.

[0112] Specifically, in this embodiment, the material of at least a portion of the first shielding part 31 includes one of ferrite, nanocrystals, and silicon steel sheets. The first shielding part 31 can also be other soft magnetic materials, which can be determined according to the actual situation, and this specification does not limit this embodiment.

[0113] It is understood that the shielding structure may include the magnet structure, which, while conducting magnetism, can also achieve magnetic shielding for each pair of winding units 2 in the bottom and side directions.

[0114] The conventional coil of an induction cooker is a single-ring spiral winding structure. Its heating effect on cookware is limited by its own physical electromagnetic field, with heat concentrated inward. When the object to be heated is a wok, the large spacing between the coils on the side walls prevents heat from concentrating on the pot wall, resulting in poor heating. Even increasing the coil diameter does not significantly increase the heat on the pot wall. This application addresses the above-mentioned technical problems (see Figures 2 and 11). This application considers using multiple ring-shaped winding units arranged along the circumference of a support frame. The density of the ring segments near the outer edge of the support frame is increased to increase the induction height of the electromagnetic field, allowing the pot wall to be heated as well. Since the area between two adjacent winding units is the area of ​​strong electromagnetic field, i.e., the strongest heating effect, when energized, the area of ​​the pot wall above it becomes a hot zone, prone to overheating, dry heat, and scorching. Meanwhile, other areas are relatively too cold, resulting in uneven heating. How to solve this uneven heating is a further problem faced by this design.

[0115] To address this technical problem, this application provides a coil assembly to solve the problem of uniform heating of cookware.

[0116] Please refer to Figures 12 to 14. The coil assembly 100 includes a support 1 and at least one pair of winding units 2. Each pair of winding units 2 includes two winding units 2 disposed on the support 1 and distributed along the circumference of the support 1. Each winding unit 2 is arranged in a ring and has a first winding loop segment 201 near the center of the support 1 and a second winding loop segment 202 near the edge of the support 1. In the pair of winding units 2, the current directions of the two winding units 2 are set to be opposite, so that opposite magnetic poles are formed in the middle of the two winding units 2. In at least one of the winding units 2, the width of the first winding loop segment 201 is d1 and the width of the second winding loop segment 202 is d2, wherein d1 is greater than d2. In the circumference of the support 1, a first non-wiring area a is formed between two adjacent first winding loop segments 201, and the width of the first non-wiring area a is d≥5mm.

[0117] In another coil assembly 100 provided in this application, the coil assembly 100 includes a support 1 and at least a pair of winding units 2. Each pair of winding units 2 includes two winding units 2 disposed on the support 1 and distributed along the circumference of the support 1. Each winding unit 2 is arranged in a ring and has a first winding loop segment 201 near the center of the support 1 and a second winding loop segment 202 near the edge of the support 1. In the pair of winding units 2, the current directions of the two winding units 2 are set to be opposite, so that opposite magnetic poles are formed in the middle of the two winding units 2. In at least one of the winding units 2, the winding center of the winding unit 2 is located on the side of its geometric center near the second winding loop segment 202. In the circumference of the support 1, a first non-wiring area a is formed between two adjacent first winding loop segments 201, and the width d of the first non-wiring area a is ≥ 5 mm.

[0118] It should be noted that in the existing technology, the conventional coil is set as a circular spiral winding structure, and the gap between two adjacent windings is uniform and the same. When the conventional coil is coupled with the cookware 200, especially the wok type cookware 200, the side wall of the cookware 200 is far from the bottom due to the shape characteristics of the wok, and the magnetic field density of the coil is relatively small, resulting in low heating efficiency.

[0119] It should be noted that the shapes of the winding units 2 in the "multiple winding units 2" mentioned in this application can be the same or different. Each winding unit 2 is formed by winding multiple turns of coil. Each turn of coil in each winding unit 2 can be regarded as a ring structure. Of course, the ring structure is not limited to being circular; it can be square or elliptical. Each winding unit 2 can be laid flat along a surface area, which can be a plane or a curved surface. Each winding unit 2 can also be bent. The specifics can be determined according to the actual situation, and the embodiments in this specification do not limit this.

[0120] "The plurality of winding units 2 are distributed along the circumference of the bracket 1" can mean that the plurality of winding units 2 are distributed in a ring on the same side of the bracket 1, or that some winding units 2 are located on one side of the bracket 1 and other winding units 2 are located on the other side of the bracket 1. However, as long as they are distributed in a ring on the projection surface of the bracket 1, they can be regarded as "the plurality of winding units 2 are distributed along the circumference of the bracket 1".

[0121] "Current direction" refers to the direction in which the current of the winding unit 2 flows clockwise or counterclockwise. "The current directions of the two winding units 2 are set to be opposite" means that when the current direction of one winding unit 2 is clockwise, the current direction of the other winding unit 2 is counterclockwise.

[0122] It should be noted that, according to Ampere's law: if you hold a current-carrying solenoid with your right hand and point your four fingers in the direction of the current, then the end pointed to by your thumb is the N pole of the current-carrying solenoid. Thus, as shown in Figure 17, when the current directions of the two winding units 2 are set to opposite, a closed magnetic field is formed between the two winding units 2. For example, one of the two winding units 2 is set as the first winding unit and the other as the second winding unit. When the first winding unit and the second winding unit are laid flat in the horizontal direction, the N pole is formed on the upper side of the first winding unit and the S pole is formed on the lower side. At the same time, the S pole is formed on the upper side of the second winding unit and the N pole is formed on the lower side. In this way, the magnetic field lines run from the N pole of the first winding unit to the S pole of the second winding unit, then from the S pole of the second winding unit to the N pole, then from the N pole of the second winding unit to the S pole of the first winding unit, and then from the S pole of the first winding unit back to the N pole of the first winding unit, thus forming a closed magnetic field.

[0123] Therefore, when a pair of winding units 2 are energized, the closed magnetic field formed between the two irregular magnetic poles formed by the two winding units 2 can couple with the pot wall which is far away from the winding unit 2, thereby heating the pot wall.

[0124] "The width of the first winding loop segment 201 is d1, and the width of the second winding loop segment 202 is d2, where d1 is greater than d2." This can be achieved by reducing the winding length in the corresponding area of ​​the second winding loop segment 202; alternatively, when adjacent winding segments in the first and second winding loop segments 201 are arranged in parallel, the winding gap of the first winding loop segment 201 is set to be greater than the winding gap of the second winding loop segment 202. Of course, when adjacent winding segments in each winding loop segment are not arranged in parallel, the winding gap will be uneven, but other winding segments can be adaptively adjusted to ultimately achieve d1 greater than d2.

[0125] "The winding center of the winding unit 2 is located on the side of its geometric center close to the second winding loop segment 202". The winding unit 2 can be set into a fan-shaped, triangular or other shape. The geometric center can be adjusted by adjusting the shape of the winding unit 2.

[0126] Understandably, according to Ampere's law, the magnetic poles formed by the winding unit 2 correspond to the inner ring region of the ring. When "d1 is greater than d2" or "the winding center is located on the side of its geometric center close to the second winding ring segment 202", the magnetic poles of the corresponding winding unit 2 are formed in the region close to the support and the outer periphery, thereby achieving the largest possible heating range for the pot wall.

[0127] Of course, the specific ways to make the width of the first winding loop segment 201 greater than the width of the second winding loop segment 202, and to make the winding center of the winding unit 2 located on the side of its geometric center close to the second winding loop segment 202, are not limited to the examples above. Those skilled in the art may make other changes under the guidance of the technical essence of the embodiments in this specification. However, as long as the functions and effects achieved are the same as or similar to those in the embodiments of this specification, they should all be covered within the protection scope of the embodiments of this specification.

[0128] "A first non-wired area a is formed between two adjacent first winding loop segments 201" means that no coil is laid in the area between each pair of adjacent first winding loop segments 201, so that there is a certain distance between the two adjacent winding units 2, and they are not in a tightly fitted state.

[0129] In the technical solution provided in this application, by placing the magnetic pole formed in the middle of at least one winding unit 2 closer to the side of the corresponding second winding loop segment 202, the magnetic pole formed in the middle of the winding unit 2 can be closer to the edge of the support 1, and can couple with the position of the corresponding pot wall 2002, thereby increasing the heating range of the pot wall 2002 and improving the uniformity of heating the bottom 2001 and the pot wall 2002 of the cookware 200. Since the current direction of the conductor segments of the two adjacent first winding loop segments 201 is consistent, the magnetic field in this area is relatively concentrated. By making the distance d ≥ 5mm between the two adjacent first winding loop segments 201, the magnetic field strength of the connecting area between the two adjacent winding units 2 is adjusted, weakening the heating concentration at the bottom 2001 of the pot, thereby further improving the heating uniformity of the cookware 200.

[0130] Furthermore, d≤40mm. "The width d≤40mm of the first non-wiring area a" means that the two adjacent first winding loop segments 201 are controlled within this range to avoid excessive spacing, which would reduce the magnetic field too much and form a heating blind zone.

[0131] Further, referring to Figures 16 and 17, in the embodiments of this application, one end of the plurality of first winding loop segments 201 near the center of the support 1 defines a second non-wiring area b, the diameter D of the second non-wiring area b being ≤10mm. This arrangement ensures a strong electromagnetic field in the central region of the coil assembly 100, resulting in good heating of the corresponding pot 200 center and further improving heating uniformity, while also providing space for placing a temperature sensing element in the second non-wiring area b.

[0132] Furthermore, referring to Figure 15, the coil assembly 100 further includes at least one first temperature sensing element 5, which is disposed in the first non-wiring area a; and / or, the coil assembly 100 further includes a first temperature sensing element 6 disposed in the second non-wiring area b. Thus, temperature sensing elements can be disposed in multiple first non-wiring areas a and second non-wiring areas b, achieving multi-point temperature measurement, improving temperature sensitivity, and making the temperature control of the cooking appliance more accurate.

[0133] It should also be noted that because multi-point temperature measurement is used, the temperature control is more accurate and the power of the coil assembly 100 can be adjusted in time when the temperature is too high. Therefore, when the coil assembly 100 is applied to an induction cooker, the microcrystalline glass with good thermal conductivity can be replaced with borosilicate glass with relatively poor thermal conductivity. This can achieve a sufficiently accurate temperature control function while also reducing the cost of panel manufacturing.

[0134] It should also be noted that when "d≥5mm", space is provided for the arrangement of temperature sensing elements (such as thermistors). Temperature sensing elements can be installed in multiple non-wiring areas, enabling multi-point temperature measurement, improving temperature sensitivity, and making the temperature control of cooking utensils more accurate.

[0135] When the cookware 200 is placed, food tends to accumulate at the bottom of the cookware 200 in the area required for stir-frying. Therefore, the area of ​​the coil assembly 100 corresponding to the bottom 2001 of the cookware needs to be appropriately increased. Furthermore, in this embodiment, d1 > 1.2d2. With this setting, when the ratio of d1 to d2 is constrained to be greater than 1.2, the area of ​​the heating region formed by the plurality of first winding loop segments 201 in the middle of the support 1 is greater than the area of ​​the annular heating region formed by the plurality of second winding loop segments 202 at the edge of the support 1, making the coil assembly 100 better suited for real-world stir-frying scenarios.

[0136] Specifically, the first winding loop segment 201 is arranged to protrude from both ends toward the middle section near the center of the bracket 1, and has two sides 2011 arranged at an angle, each side 2011 being arranged in a straight line; in each pair of adjacent winding units 2, the first non-wiring area a is defined between the two oppositely arranged sides 2011.

[0137] It should be noted that "protrusion" means that it protrudes further towards the center than the arcs at both ends of the first winding loop segment 201. With this setting, multiple first winding loop segments 201 protrude in a direction that is close to each other, thereby avoiding the formation of a weak magnetic field area in the inner area formed by multiple winding units 2.

[0138] In practical applications, when the cookware is too small to cover the area corresponding to the second winding loop 202, cookware of different diameters can all heat the area where the first winding loop 201 is located.

[0139] Thus, when the multiple winding units 2 carry current in opposite directions, the current directions of the conductor segments of two adjacent winding units 2 that are close to each other are consistent. The magnetic fields in this area are superimposed, which can generate a higher magnetic field. The first winding loop segment 201 is bent, and the number of magnetic field lines in the blank area enclosed by the first winding loop segment 201 is small, thereby improving the problem of uneven heating caused by excessive heating at the bottom of the pot 200.

[0140] "Each of the aforementioned sides 2011 is arranged in a straight line." Because the magnetic field generation method of a straight conductor segment is relatively simple, it can reduce energy loss in the coil, thus improving energy utilization efficiency. Furthermore, the magnetic field generated by a straight conductor segment is easier to calculate and control, typically resulting in a more uniform magnetic field distribution, which helps improve the efficiency and stability of the coil. In addition, the structure of a straight conductor segment is simpler, making processing and installation more convenient and faster, reducing the engineering complexity of the system, simplifying the design and debugging process, and contributing to improved system reliability and stability.

[0141] In one embodiment, referring to Figure 16, two adjacent winding units 2 are arranged with their two sides 2011 parallel to each other. The magnetic field directions of the two sides 2011 are also parallel, which helps to reduce electromagnetic interference between coils and avoids unnecessary electromagnetic coupling and interference caused by the winding units 2 crossing or interleaving each other, thus affecting the performance and stability of the circuit. At the same time, it can reduce energy loss and improve the efficiency of electromagnetic energy transmission.

[0142] In another embodiment, referring to Figure 17, in the direction from the center to the edge of the bracket 1, the distance between the two opposite sides 2011 of two adjacent winding units 2 gradually increases. Thus, the first temperature sensing element 5 can be installed at a reasonable distance between the two sides 2011 according to the installation requirements, facilitating installation.

[0143] Furthermore, the multiple winding units 2 can be arranged in series or in parallel. When the multiple winding units 2 are arranged in series, the current direction of adjacent winding units 2 can be reversed when energized simply by adjusting the winding direction. Specifically, referring to Figure 14, each pair of adjacent winding units 2 includes a first winding unit 21 and a second winding unit 22. The first winding unit 21 has a first input terminal 211, a first winding 212, and a first output terminal 213. The first winding 212 is wound outward from the first input terminal 211 in a first clockwise direction, and the first output terminal 213 is connected to the outer end of the first winding 212. The second winding unit 22 has a second input terminal 221, a second winding 222, and a second output terminal 223. The second winding 222 is wound outward from the second input terminal 221 in a second clockwise direction opposite to the first clockwise direction, and the second output terminal 223 is connected to the outer end of the second winding 222. In this way, the winding method is simple and convenient for production and processing.

[0144] This application also provides an electromagnetic heating device, which includes a coil assembly 100 and an electronic control device as described in the above embodiments. The specific structure of the coil assembly 100 is as described in the above embodiments. Since this electromagnetic heating device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0145] The electromagnetic heating device can be an induction cooker or an electric pressure cooker, etc. Only electromagnetic heating devices with the coil assembly 100 belong to the electromagnetic heating devices described in this application.

[0146] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A coil disk assembly, wherein, The coil disk assembly includes: stents; and, At least one pair of winding units, each pair of winding units includes two winding units disposed on the bracket and distributed along the circumference of the bracket, each winding unit being arranged in a ring, having a first winding loop segment near the center of the bracket and a second winding loop segment near the edge of the bracket; In the pair of winding units, the current directions of the two winding units are set to be opposite, so that opposite magnetic poles are formed in the middle of the two winding units, and in at least one of the winding units, the width of at least a portion of the first winding loop segment is d1, the width of at least a portion of the second winding loop segment is d2, and d1 is greater than d2.

2. A coil disk assembly, wherein, The coil disk assembly includes: stents; and, At least one pair of winding units, each pair of winding units includes two winding units disposed on the bracket and distributed along the circumference of the bracket, each winding unit being arranged in a ring, having a first winding loop segment near the center of the bracket and a second winding loop segment near the edge of the bracket; In the pair of winding units, the current directions of the two winding units are set to be opposite, so that opposite magnetic poles are formed in the middle of the two winding units, and in at least one of the winding units, the winding center of the winding unit is located on the side of its geometric center close to the second winding loop segment.

3. The coil assembly as claimed in claim 1 or 2, wherein, At least a portion of the winding gap of the first winding loop segment is greater than the winding gap of the second winding loop segment.

4. The coil assembly as claimed in claim 3, wherein, The support is provided with a winding structure for the winding unit to wind, the winding structure including: The first winding portion includes a plurality of first winding grooves formed on one side of the bracket; The second winding portion defines a second winding groove with its opening facing the periphery of the bracket; and, The first winding loop segment is correspondingly disposed in the plurality of first winding slots, and the second winding loop segment is confined to the second winding slot.

5. The coil assembly as claimed in claim 3, wherein, The support is provided with a winding structure for the winding unit to wind, the winding structure including: At least two third winding portions are spaced apart in a direction outward from the center of the bracket, and each third winding portion defines a third winding groove with its opening facing the periphery of the bracket; and, The fourth winding portion defines a fourth winding groove with its opening facing the periphery of the bracket; and, Wherein, a portion of the first winding loop segment is confined to one of the third winding slots, another portion of the first winding loop segment is confined to another of the third winding slots, and the second winding loop segment is confined to the fourth winding slot.

6. The coil assembly as claimed in claim 1 or 2, wherein, The number of layers of the winding unit at the first winding loop segment is N1, and the number of layers of the winding unit at the second winding loop segment is N2, wherein N2 is greater than N1.

7. The coil assembly as claimed in claim 1 or 2, wherein, The first winding loop segment protrudes from both ends toward the middle section, close to the center of the bracket.

8. The coil assembly as claimed in claim 7, wherein, The included angle formed at the bend of the first winding loop segment is A, where 80°≤A≤100°.

9. The coil assembly as claimed in claim 1 or 2, wherein, At least 3 / 4 of the turns of the coil in the winding unit are wound in the same direction.

10. The coil assembly as claimed in claim 1 or 2, wherein, The multiple winding units are arranged in series or in parallel.

11. The coil assembly as claimed in claim 1 or 2, wherein, In a pair of said winding units, the two winding units include: A first winding unit has a first input terminal, a first winding, and a first output terminal. The first winding is wound outwards from the first input terminal in a first clockwise direction. The first output terminal is connected to the outer end of the first winding. The second winding unit has a second input terminal, a second winding, and a second output terminal. The second winding is wound outward from the second input terminal along a second clockwise direction opposite to the first clockwise direction. The second output terminal is connected to the outer end of the second winding.

12. The coil assembly as claimed in claim 1, wherein, The coil assembly further includes a magnet structure, which includes two magnetic end portions disposed at the middle of the two winding units in a pair of winding units, and an extension portion located between the two magnetic end portions.

13. The coil assembly of claim 12, wherein, The two magnetic end portions and the extension portion are integrally formed; or... The extension includes two connecting portions that are integrally formed with the two magnetic end portions.

14. The coil assembly as claimed in claim 1, wherein, The coil assembly also includes a shielding structure, which includes a first shielding portion disposed on the side of the winding unit facing the support.

15. The coil assembly of claim 14, wherein, The shielding structure also includes a second shielding portion surrounding each pair of winding units.

16. The coil assembly of claim 14, wherein, The shielding structure is made of at least one of the following materials: ferrite, nanocrystals, and silicon steel sheets.

17. The coil assembly as claimed in claim 1 or 2, wherein, In the circumferential direction of the bracket, a first non-wiring area is formed between two adjacent first winding loop segments, and the width d of the first non-wiring area is ≥ 5 mm.

18. The coil assembly of claim 17, wherein, d≤40mm.

19. The coil assembly of claim 17, wherein, The first winding loop segments near the center of the bracket define a second non-wiring area, the diameter of which is D≤10mm.

20. The coil assembly of claim 17, wherein, The coil assembly further includes at least one first temperature sensing element, which is disposed in the first non-wiring area; and / or, The plurality of first winding segments define a second non-wiring area at one end near the center of the bracket, and the coil assembly further includes a second temperature sensing element disposed in the second non-wiring area.

21. The coil assembly as claimed in claim 1, wherein, d1 > 1.2d2.

22. The coil assembly of claim 17, wherein, The first winding loop segment protrudes from both ends toward the middle section, close to the center of the bracket, and has two sides arranged at an angle, with each side arranged in a straight line. In each pair of adjacent winding units, the first non-wiring area is defined between the two oppositely positioned sides.

23. The coil assembly of claim 22, wherein, The two adjacent winding units are arranged with their two sides parallel to each other.

24. The coil assembly of claim 22, wherein, In the direction from the center of the bracket towards the edge, the distance between the two sides of two adjacent winding units that are arranged opposite each other gradually increases.

25. An electromagnetic heating device, wherein, The electromagnetic heating device includes a coil assembly as described in any one of claims 1 to 24.

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