Heating device and cooking utensil
By setting a magnetic permeable structure on the mounting bracket of the heating device, the magnetic field is guided to the corner part, and the problem of insufficient heating of the existing square coil heating device at the corner position is solved, thereby achieving a more uniform heating effect of the pot.
Patent Information
- Application Number
- CN202420604198.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-03-26
AI Technical Summary
The existing square coil heating device has weak heating at the corner position, resulting in a weak heat field at the four corners of the pot, making it impossible to achieve the square heating effect of the coil shape.
A heating device is designed, including a mounting bracket, a coil winding and a magnetically conductive structure. The magnetically conductive structure extends from the middle part of the coil winding to the corner part through the first magnetic strip, and uses the magnetic convergence of the magnetic strip to guide the magnetic field to the corner part, thereby enhancing the heat field.
Through the design of the magnetic permeable structure, the heat field at the corners of the pot is effectively enhanced, the problem of heating blind spots in the corners of the square plate is solved, and a more uniform heating effect is achieved.
Smart Images
Figure CN222706657U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electromagnetic heating, in particular to a heating device and a cooking utensil. Background Art
[0002] In household appliances, electromagnetic heating is almost universal. Electromagnetic heating uses a coil disk as a magnetic field provider, and generates a heating current through the effect of the magnetic field on the pot. The heating current acts on the cooking pot to generate heat, and the location and area of the heat field generated in the cooking pot depends on the location of the coil winding, that is, the area where the heat field is formed will not exceed the coil area.
[0003] For conventional induction cookers (ranges), the cooking support surface is almost flat, and the bottom of the pot it supports is also flat; while the heating coil shape of our conventional products, in order to increase its heating area, also uses a square coil to match the square inner pot to achieve a larger heating area (see Figure 1 , 2 As shown), the heating at the corners of this conventional square coil is weaker because the magnetic fields of the coils on both sides of the corners cancel each other out. When a square pot is used for cooking, the heat field at the four corners of the pot will also be weak. Therefore, this conventional square coil solution will cause the problem of weak heat field in the corners and cannot truly achieve the square heating effect of the coil shape. Utility Model Content
[0004] The main purpose of the utility model is to provide a heating device and a cooking utensil, aiming to solve the problem that there are heating blind areas in the corners of the existing square dishes, resulting in weak thermal fields in the corners.
[0005] In order to achieve the above-mentioned purpose, the utility model provides a heating device, which comprises:
[0006] A mounting bracket, wherein the mounting bracket has a corner portion;
[0007] a coil winding mounted on the mounting bracket; and
[0008] The magnetic conductive structure is arranged on one side of the coil winding, and the magnetic conductive structure includes a first magnetic strip, and the first magnetic strip extends from the middle of the coil winding toward the outside and extends to the corner.
[0009] Optionally, the mounting bracket is arranged in a quasi-square shape to have a plurality of first side edges, and the corner portion is formed at the intersection of two adjacent first side edges.
[0010] Optionally, the first magnetic strips are arranged in a straight line.
[0011] Optionally, the first magnetic strip includes a first main section extending from the middle of the coil winding to the corner portion, and a first protruding section bent from at least one end of the first main section toward the other side of the coil winding, and the first protruding section is located on the outside of the outermost coil of the coil winding.
[0012] Optionally, the mounting bracket has a plurality of corner portions, and correspondingly, a plurality of the first magnetic strips are provided.
[0013] Optionally, the coil winding includes a first coil winding and a second coil winding arranged around the first coil winding, the second coil winding is arranged in a square ring shape to have multiple second sides, and a chamfer is arranged at the intersection of two adjacent second sides, and the chamfer is arranged corresponding to the corner portion.
[0014] Optionally, the magnetic conductive structure further comprises a plurality of magnetic strips spaced apart along the circumference of the mounting bracket, each of the magnetic strips extending from the middle of the coil winding to the circumference thereof.
[0015] Optionally, the multiple magnetic strips include multiple second magnetic strips and multiple third magnetic strips, the length of the second magnetic strips is set to be greater than the third magnetic strips, each of the second magnetic strips is located between each adjacent two of the first magnetic strips, and each of the third magnetic strips is located between the adjacent first magnetic strips and the second magnetic strips.
[0016] Optionally, each of the second magnetic strips extends from the inner side of the innermost circle of the first coil winding to the outer side of the outermost circle of the second coil winding; and / or,
[0017] Each of the third magnetic strips extends from the inner side of the innermost circle of the second coil winding to the outer side of the outermost circle of the second coil winding.
[0018] Optionally, the second magnetic strip includes a second main body section extending from the middle of the coil winding to the corner portion, and a second protruding section bent from at least one end of the second main body section from one side of the coil winding to the other side thereof, and the second protruding section is located on the inner side of the innermost coil of the coil winding.
[0019] Optionally, the magnetic permeability of each of the second magnetic strips is set to be smaller than that of each of the first magnetic strips and each of the third magnetic strips.
[0020] Optionally, the coil winding is arranged in a quasi-square shape, and the side length of the coil winding is set to A, wherein 170mm≤A≤260mm.
[0021] Optionally, the quasi-square shape includes one of a rectangle, a square and a racetrack shape.
[0022] The utility model also provides a cooking utensil, the cooking utensil comprising a heating device, the heating device comprising:
[0023] A mounting bracket, wherein the mounting bracket has a corner portion;
[0024] a coil winding mounted on the mounting bracket; and
[0025] The magnetic conductive structure is arranged on one side of the coil winding, and the magnetic conductive structure includes a first magnetic strip, and the first magnetic strip extends from the middle of the coil winding toward the outside and extends to the corner.
[0026] Optionally, the cooking utensil comprises an induction cooker or an induction range.
[0027] In the technical solution provided by the utility model, the coil winding is installed on the mounting bracket. Since the mounting bracket has corners, the magnetic field generated by the coil winding is difficult to reach the corners, that is, it is difficult to form a thermal field at the position of the cookware corresponding to the corners, thereby causing uneven heating of the cookware. By extending the first magnetic strip from the middle of the coil winding toward the outside and extending it to the corners, the magnetic field is guided to the corners by utilizing the magnetic focusing effect of the magnetic strip, so that the magnetic field at the corners is increased, thereby achieving the thermal field enhancement of the cookware at the position corresponding to the corners, so as to solve the problem that there is a heating blind spot in the corners of the existing square plate, resulting in a weak thermal field in the corners. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0029] Figure 1 It is a plan view of the coil winding involved in the utility model;
[0030] Figure 2 It is a schematic diagram of the thermal field range formed by the square coil disk;
[0031] Figure 3 A schematic plan view of an embodiment of a heating device provided by the utility model;
[0032] Figure 4 A schematic diagram of the thermal field range formed by the square coil winding of the heating device provided by the utility model;
[0033] Figure 5The utility model is an exploded schematic diagram of an embodiment of the cooking device provided by the utility model.
[0034] Description of Figure Numbers:
[0035] Label name Label name 1 Mounting Bracket 22 Second coil winding 11 Corner 221 Second side 12 First side 3 First magnetic stripe 2 Coil Winding 4 Second magnetic strip 21 First coil winding 5 The third magnetic strip
[0036] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0040] In household appliances, electromagnetic heating is almost universal. Electromagnetic heating uses a coil disk as a magnetic field provider, and generates a heating current through the effect of the magnetic field on the pot. The heating current acts on the cooking pot to generate heat, and the position and area of the heat field generated in the cooking pot depends on the position of the coil winding, that is, the area where the heat field is formed will not exceed the coil area; for the commonly used induction cookers (stoves), the cooking support surface is almost flat, and the bottom of the pot it supports is also flat; and the shape of the heating coil of our conventional products, in order to increase its heating area, also uses a square coil to match the square inner pot to achieve a larger heating area (see Figure 1 , 2 As shown), the heating at the corners of this conventional square coil is weaker because the magnetic fields of the coils on both sides of the corners cancel each other out. When a square pot is used for cooking, the heat field at the four corners of the pot will also be weak. Therefore, this conventional square coil solution will cause the problem of weak heat field in the corners and cannot truly achieve the square heating effect of the coil shape.
[0041] In order to solve the above problems, the utility model provides a heating device. Figure 1 It is a plan view of the coil winding involved in the utility model; Figure 2 It is a schematic diagram of the thermal field range formed by the square coil disk; Figure 3 A schematic plan view of an embodiment of a heating device provided by the utility model; Figure 4 A schematic diagram of the thermal field range formed by the square coil winding of the heating device provided by the utility model; Figure 5 The utility model is an exploded schematic diagram of an embodiment of the cooking device provided by the utility model.
[0042] See also Figure 3 to Figure 4 The heating device includes a mounting bracket 1, a coil winding 2 and a magnetic conductive structure, wherein the mounting bracket 1 has a corner portion 11; the coil winding 2 is mounted on the mounting bracket 1; the magnetic conductive structure is arranged on one side of the coil winding 2, and the magnetic conductive structure includes a first magnetic strip 3, which extends outward from the middle of the coil winding 2 and extends to the corner portion 11.
[0043] It should be noted that the corner portion 11 can be understood as a non-arc shape, so the coil disk is a non-circular shape, that is, the coil disk is set to have a shape of a corner portion 11, such as a polygon, a sector, etc.
[0044] It is understandable that the magnetic strip, as a magnetic conductor, can concentrate and guide the magnetic field, making the magnetic field more concentrated and powerful. By setting up the magnetic strip, the present application can, on the one hand, reduce the loss of the magnetic field, thereby enhancing the magnetic field strength of the coil; on the other hand, the magnetic strip can help orient and focus the magnetic field, making the magnetic field more concentrated and more directional, and the magnetic field can be guided according to the layout direction and shape of the magnetic strip.
[0045] In the technical solution provided by the utility model, the coil winding 2 is installed on the mounting bracket 1. Since the mounting bracket 1 has a corner portion 11, the magnetic field generated by the coil winding 2 is difficult to reach the corner portion 11, that is, it is difficult to form a thermal field at the position of the cookware corresponding to the corner portion 11, thereby causing uneven heating of the cookware. By extending the first magnetic strip 3 from the middle of the coil winding 2 toward the outside and extending it to the corner portion 11, the magnetic field is guided to the corner portion 11 by utilizing the magnetic concentration effect of the magnetic strip, so that the magnetic field at the corner portion 11 is increased, thereby achieving the thermal field enhancement of the cookware at the position corresponding to the corner portion 11, so as to solve the problem that there is a heating blind spot in the corner of the existing square plate, resulting in a weak thermal field in the corner.
[0046] Specifically, in this embodiment, the mounting bracket 1 is arranged in a square shape to have a plurality of first sides 12, and the corners 11 are formed at the intersection of two adjacent first sides 12. Thus, when the coil winding 2 is circular, the four corners of the mounting bracket 1 respectively form the corners 11 relative to the coil winding 2. Since the housings of most cooking utensils on the market are arranged in a square shape, the mounting bracket 1 is arranged in a square shape so that the mounting bracket 1 can be better adapted to the housing of the cooking utensils.
[0047] Of course, the mounting bracket 1 may also be provided in other possible shapes, such as a pentagon, a hexagon, a rhombus, etc. The specific shape may be determined according to actual conditions, and the embodiments of this specification do not limit this.
[0048] The first magnetic strip 3 has different shapes, and the effects it can play are also different. In the first embodiment, the first magnetic strip 3 is arranged in a straight line. Due to the shape characteristics of the bar magnet, the magnetic field can be made more uniform and directional, so that the directionality of the magnetic field can be better controlled.
[0049] In the second embodiment, the first magnetic strip 3 includes a first main body section extending from the middle of the coil winding 2 to the corner section 11, and a first protruding section bent from the inner end of the first main body section toward the other side of the coil winding 2, and the first protruding section is located outside the outermost coil of the coil winding 2. In this way, the first magnetic strip 3 forms an L shape, and when the first protruding section is disposed outside the outermost coil of the coil winding 2, the magnetic field can be prevented from spreading outward, so as to magnetically shield the circumference of the coil winding 2.
[0050] In the third embodiment, the first magnetic strip 3 includes a first main body section extending from the middle of the coil winding 2 to the corner portion 11, and two first protruding sections bent from the inner end and the outer end of the first main body section toward the other side of the coil winding 2, wherein one of the first protruding sections is located on the inner side of the innermost coil of the coil winding 2, and the other first protruding section is located on the outer side of the outermost coil of the coil winding 2. Of course, the first protruding section arranged at the inner end of the first main body section can also be a coil passing through part of the inner circle area or a coil passing through the inner side completely, so that the first magnetic strip 3 forms a U-shape, and when the first protruding section located on the outer side is arranged on the outer side of the outermost coil of the coil winding 2, the magnetic field can be prevented from spreading outward, so as to magnetically shield the peripheral side of the coil winding 2; the first protruding section located on the inner side further enhances the magnetic field around the corner portion 11.
[0051] Furthermore, in this embodiment, the mounting bracket 1 has a plurality of corner portions 11, and correspondingly, a plurality of first magnetic strips 3 are provided. In this way, each of the first magnetic strips 3 can guide the magnetic field toward the corresponding corner portion 11, so that the magnetic field generated by the coil winding 2 is adapted to the shape of the mounting bracket 1 as much as possible, so that the coil winding 2 has a heating area as large as possible, and can provide a larger heat field area for larger pots.
[0052] In this embodiment, the coil winding 2 includes a first coil winding 21 and a second coil winding 22 arranged around the first coil winding 21. The second coil winding 22 is arranged in a square ring shape to have a plurality of second side edges 221. A chamfer is arranged at the junction of two adjacent second side edges 221, and the chamfer is arranged corresponding to the corner portion 11.
[0053] Please note that Figure 2, the second coil winding 22 is set to a square ring shape, so the winding is about 90 degrees at the corner. During operation, the current direction of the two adjacent sides of the square second coil winding 22 changes suddenly at the corner, the induced magnetic field generated by the coil changes 90°, the direction of the magnetic field changes suddenly, and the partial components of the magnetic field generated by the same wire on both sides of the corner are offset, resulting in a weak magnetic field at the corner and a weak thermal field, resulting in a thermal field only formed in area A, blind spots appearing at the four corners, and uneven heating.
[0054] The chamfer is used to transition the two second side edges 221, thereby avoiding a sudden change in the current direction between the two second side edges 221, reducing the degree of offset of the magnetic field component, relieving the sudden change of the electromagnetic field, and making the thermal field more uniform. In addition, the chamfer is arranged corresponding to the corner portion 11, and the first magnetic strip 3 can further guide the magnetic field at the chamfer to adapt to the shape of the mounting bracket 1, and can also form a thermal field in the B area. The thermal field generated by the heating device has four A areas and four B areas, forming eight thermal field areas, thereby increasing the heating area and heating energy efficiency.
[0055] In this embodiment, the magnetic conductive structure further includes a plurality of magnetic strips spaced apart along the circumference of the mounting bracket 1, each of the magnetic strips extending from the middle of the coil winding 2 to the circumference thereof. By providing a plurality of magnetic strips spaced apart along the circumference, the magnetic field distribution of the entire coil can be made more uniform, which helps to improve the performance and stability of the coil, and at the same time can improve the efficiency of the coil, so that the coil winding generates a stronger magnetic field under a given current, or requires a smaller current to maintain the same magnetic field.
[0056] It is understandable that the shapes and sizes of the magnetic strips can be set the same or in an inconsistent form to achieve a better effect. Specifically, in this embodiment, the multiple magnetic strips include multiple second magnetic strips 4 and multiple third magnetic strips 5. The length of the second magnetic strips 4 is set to be greater than the third magnetic strips 5. Each second magnetic strip 4 is located between each two adjacent first magnetic strips 3, and each third magnetic strip 5 is located between the adjacent first magnetic strips 3 and the second magnetic strip 4. In this way, by setting multiple second magnetic strips 4, a radial magnetic structure can be formed with the first magnetic strip 3, so that the magnetic field distribution of the entire coil is more uniform. Setting the second magnetic strip 4 to be longer can provide a larger magnetic shielding area and magnetic permeability, and absorb and transfer the magnetic field. Setting the shorter third magnetic strip 5 between the two relatively long first magnetic strips 3 and the second magnetic strip 4 can fill the gap between the first magnetic strip 3 and the second magnetic strip 4, and reduce the interference range of the magnetic field. The first magnetic strip 3, the second magnetic strip 4 and the third magnetic strip 5 form a protective ring, which can more effectively weaken the diffusion and leakage of the magnetic field and improve the magnetic shielding effect.
[0057] Specifically, in this embodiment, each of the second magnetic strips 4 extends from the inner side of the innermost circle of the first coil winding 21 to the outer side of the outermost circle of the second coil winding 22; and / or each of the third magnetic strips 5 extends from the inner side of the innermost circle of the second coil winding 22 to the outer side of the outermost circle of the second coil winding 22. In this way, the second magnetic strip 4 can increase the magnetic field strength of the area corresponding to the entire coil winding 2, because the magnetic field strength of the inner circle of the coil winding 2 is relatively greater than that of the outer circle. By setting the third magnetic strip 5, the third magnetic strip 5 further enhances the magnetic field of the outer circle of the coil winding 2. Magnetic strips are set for areas with weak magnetic fields, so that the magnetic field distribution of the entire coil is more uniform.
[0058] Specifically, in this embodiment, the second magnetic strip 4 includes a second main body section extending from the middle of the coil winding 2 to the corner portion 11, and a second protruding section bent from at least one end of the second main body section from one side of the coil winding 2 to the other side thereof, and the second protruding section is located on the inner side of the innermost coil of the coil winding 2.
[0059] In the first embodiment, the second magnetic strip 4 includes a second main body section extending from the middle of the coil winding 2 to the corner portion 11, and a second protruding section bent from the inner end of the second main body section from one side of the coil winding 2 to the other side thereof, and the second protruding section is located inside the innermost coil of the coil winding 2. In this way, the second magnetic strip 4 is set to be L-shaped, because the magnetic field in the central area of the first coil winding 21 is relatively weak. By arranging the second protruding section inside the innermost coil of the coil winding 2, the magnetic field in the central area of the first coil winding 21 can be further enhanced.
[0060] In the second embodiment, the second magnetic strip 4 includes a second main body section extending from the middle of the coil winding 2 to the corner portion 11, and a second protruding section bent from one side of the coil winding 2 to the other side thereof from the outer end of the second main body section, and the second protruding section is located outside the outermost coil of the coil winding 2. In this way, the second magnetic strip 4 is set in an L shape, and when the second protruding section is arranged outside the outermost coil of the coil winding 2, the magnetic field can be prevented from spreading outward, so as to magnetically shield the circumference of the coil winding 2.
[0061] In the second embodiment, the second magnetic strip 4 includes a second main body section extending from the middle of the coil winding 2 to the corner portion 11, and two second protruding sections bent from the inner end and the outer end of the second main body section from one side of the coil winding 2 to the other side thereof, wherein one of the second protruding sections is located on the outer side of the outermost coil of the coil winding 2, and the other second protruding section is located on the inner side of the innermost coil of the coil winding 2. In this way, the second magnetic strip 4 forms a U-shape, and when the second protruding section located on the outer side is arranged on the outer side of the outermost coil of the coil winding 2, the magnetic field can be prevented from spreading outward, so as to magnetically shield the peripheral side of the coil winding 2; the second protruding section located on the inner side further enhances the magnetic field in the central area of the first coil winding 21.
[0062] Further, in this embodiment, the magnetic permeability of each of the second magnetic strips 4 is set to be smaller than that of each of the first magnetic strips 3 and each of the third magnetic strips 5. The first magnetic strips 3 and the third magnetic strips 5 are high-permeability strips; the second magnetic strips 4 are low-permeability strips, because the stronger the magnetic permeability of the magnetic strips, the stronger its ability to enhance the magnetic field, and conversely, the weaker the magnetic permeability of the magnetic strips, the weaker its ability to enhance the magnetic field. This arrangement avoids the concentration of too many high-permeability magnetic strips in the middle area, which can improve the outer ring heating effect of the second coil winding 22 and reduce the risk of concentrated heating in the middle.
[0063] In this embodiment, in order to make the mounting bracket 1 and the coil winding 2 be arranged in a quasi-square shape, the side length of the coil winding 2 is set to A, wherein 170 mm ≤ A ≤ 260 mm. The size of the coil winding 2 is constrained within this range, so that it can be adapted to the size of conventionally used pots.
[0064] In this embodiment, the quasi-square shape includes one of a rectangle, a square and a racetrack shape. Of course, the quasi-square shape may refer to a rectangle or a square with certain chamfers, and the chamfers may be arc angles or straight chamfers.
[0065] See also Figure 5 The present invention further provides a cooking utensil, which includes the above-mentioned cooking device. Since the cooking utensil includes the cooking device, the specific structure of the cooking device refers to the above-mentioned embodiment. Since the cooking device of the cooking utensil adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.
[0066] Specifically, the cooking utensil includes an induction cooker or an induction cooker. When the cooking utensil is set as an induction cooker, one heating device can be provided; when the cooking utensil is set as an induction cooker, multiple heating devices can be provided to form multi-head heating. Of course, the setting form and application scenario of the heating device are not limited to the above examples, and can be specifically designed according to actual conditions, and the embodiments of this specification do not limit this.
[0067] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A heating device, characterized in that: include: A mounting bracket, wherein the mounting bracket has a corner portion; A coil winding is mounted on the mounting bracket; as well as, The magnetic conductive structure is arranged on one side of the coil winding, and the magnetic conductive structure includes a first magnetic strip, and the first magnetic strip extends from the middle of the coil winding toward the outside and extends to the corner.
2. The heating device according to claim 1, characterized in that The mounting bracket is arranged in a quasi-square shape to have a plurality of first side edges, and the corner portion is formed at the intersection of two adjacent first side edges.
3. The heating device according to claim 1, characterized in that The first magnetic strip is arranged in a straight line.
4. The heating device according to claim 1, characterized in that The first magnetic strip includes a first main section extending from the middle of the coil winding to the corner, and a first protruding section bent from at least one end of the first main section toward the other side of the coil winding, and the first protruding section is located outside the outermost coil of the coil winding.
5. The heating device according to claim 1 or 2, characterized in that: The mounting bracket has a plurality of corner portions, and correspondingly, a plurality of first magnetic strips are provided.
6. The heating device according to claim 5, characterized in that The coil winding includes a first coil winding and a second coil winding arranged around the first coil winding. The second coil winding is arranged in a square ring shape to have a plurality of second sides. A chamfer is arranged at the intersection of two adjacent second sides, and the chamfer is arranged corresponding to the corner portion.
7. The heating device according to claim 6, characterized in that The magnetic conductive structure further comprises a plurality of magnetic strips spaced apart along the circumference of the mounting bracket, each of the magnetic strips extending from the middle of the coil winding to the circumference thereof.
8. The heating device according to claim 7, characterized in that The multiple magnetic strips include multiple second magnetic strips and multiple third magnetic strips, the length of the second magnetic strips is set to be greater than the third magnetic strips, each of the second magnetic strips is located between each adjacent two of the first magnetic strips, and each of the third magnetic strips is located between the adjacent first magnetic strips and the second magnetic strips.
9. The heating device according to claim 8, characterized in that Each of the second magnetic strips extends from the inner side of the innermost circle of the first coil winding to the outer side of the outermost circle of the second coil winding; and / or, Each of the third magnetic strips extends from the inner side of the innermost circle of the second coil winding to the outer side of the outermost circle of the second coil winding.
10. The heating device according to claim 9, characterized in that The second magnetic strip includes a second main body section extending from the middle of the coil winding to the corner portion, and a second protruding section bent from at least one end of the second main body section from one side of the coil winding to the other side thereof, and the second protruding section is located on the inner side of the innermost coil of the coil winding.
11. The heating device according to claim 8, characterized in that The magnetic permeability of each of the second magnetic strips is set to be smaller than that of each of the first magnetic strips and each of the third magnetic strips.
12. The heating device according to claim 1, characterized in that The coil winding is arranged in a quasi-square shape, and the side length of the coil winding is arranged to be A, wherein 170 mm≤A≤260 mm.
13. The heating device according to claim 2 or 12, characterized in that: The quasi-rectangular shape includes one of a rectangular shape, a square shape and a racetrack shape.
14. A cooking utensil, characterized in that: Comprising a heating device as claimed in any one of claims 1 to 13.
15. The cooking appliance according to claim 14, characterized in that The cooking utensil comprises an induction cooker or an induction range.