Electromagnetic heating assembly for electromagnetic heating cooking utensil and electromagnetic heating cooking utensil

Abstract

The utility model discloses an electromagnetic heating assembly for an electromagnetic heating cooking utensil and the electromagnetic heating cooking utensil. The electromagnetic heating assembly comprises at least two coils, two connecting cables and two first limiting structures. All the coils are formed by coiling the same enameled wire and are used for generating an alternating magnetic field when electrified, the winding centers of the coils deviate from the central axis of the electromagnetic heating assembly, and all the coils can rotate around the central axis of the electromagnetic heating assembly as a whole; the first ends of the two connecting cables are electrically connected with the two ends of the enameled wire respectively, and the second ends of the two connecting cables are used for being connected to a power panel respectively; the first limiting structure is arranged corresponding to the connecting cable and is used for being combined with a part of the corresponding connecting cable to limit the position of the part of the corresponding connecting cable. The electromagnetic heating assembly is provided with a bisector equally dividing the size of the electromagnetic heating assembly in the first direction, and the two first limiting structures are arranged on the two sides of the bisector respectively.

Description

Technical Field

[0001] This application relates generally to the field of cooking appliance technology, and more specifically to an electromagnetic heating component for an electromagnetic heating cooking appliance and an electromagnetic heating cooking appliance using the electromagnetic heating component. Background Technology

[0002] Induction heating (IH) appliances are household appliances that directly heat cookware using the principle of electromagnetic induction. Common examples include induction cookers and rice cookers. The coil used to generate the electromagnetic field is typically made of enameled wire, which is connected to a circuit board via a connecting cable. The routing of the connecting cable must avoid other structures within the cooking appliance to prevent damage or breakage. Utility Model Content

[0003] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] To at least partially solve the above problems, a first aspect of this application provides an electromagnetic heating assembly for an electromagnetic heating cooking appliance, the electromagnetic heating assembly having a central axis, the electromagnetic heating assembly comprising:

[0005] At least two coils, formed by winding the same enameled wire, are used to generate an alternating magnetic field when energized. The winding center of each coil is offset from the central axis of the electromagnetic heating assembly, so that the at least two coils are distributed along the circumferential direction of the electromagnetic heating assembly, and the at least two coils are rotatable about the central axis of the electromagnetic heating assembly.

[0006] Two connecting cables, each comprising a coil connection segment, a power board connection segment, and a movable segment between the coil connection segment and the power board connection segment; the two coil connection segments are respectively connected to both ends of the enameled wire; and the two power board connection segments are respectively used to connect to a power board.

[0007] Two first limiting structures are provided, each corresponding to a power board connection segment, to limit the position of the corresponding power board connection segment.

[0008] The electromagnetic heating component has a bisector that bisects the dimension of the electromagnetic heating component along a first direction, and two first limiting structures are respectively disposed on both sides of the bisector.

[0009] According to this application, the electromagnetic heating assembly can achieve multi-point heat source rotation heating, changing the convection direction of the food and ensuring even heating, thereby improving cooking quality. A connecting cable connects the enameled wire of the coil to the power board. A first limiting structure restricts the routing of the connecting cable. Two first limiting structures are respectively located on both sides of the electromagnetic heating assembly, which helps the connecting cable avoid other structures.

[0010] Optionally, at least a portion of the two first limiting structures are arranged symmetrically about the bisector.

[0011] According to this application, the two first limiting structures are arranged at least partially symmetrically, which allows at least partially symmetrical routing of the two connecting cables, thereby simplifying the design.

[0012] Optionally, the electromagnetic heating assembly further includes a driving device for providing a driving force to rotate the at least two coils. The driving device is disposed at one of two ends of the electromagnetic heating assembly spaced apart along a second direction, wherein the second direction is perpendicular to the first direction.

[0013] According to this application, the two connecting cables do not interfere with each other and the drive device.

[0014] Optionally, the electromagnetic heating assembly further includes:

[0015] Mounting bracket for connecting to an electromagnetic heating cooking appliance, wherein the driving device is disposed on the mounting bracket;

[0016] A coil disk and a mounting bracket are distributed along the axial direction of the electromagnetic heating assembly. The driving device drives the coil disk to rotate relative to the mounting bracket around the central axis of the electromagnetic heating assembly. The coil is disposed on the coil disk.

[0017] The two first limiting structures are disposed on the side of the mounting bracket facing away from the coil disc.

[0018] According to this application, the electromagnetic heating assembly achieves a modular design using a mounting bracket, which helps improve installation accuracy and reduce installation difficulty. The first limiting structure is located on the side of the mounting bracket facing away from the coil disc, which helps to separate the connecting cable from the coil, preventing them from rubbing against each other.

[0019] Optionally, the mounting bracket has two cable passage holes, which are corresponding to the connecting cables and are used to allow the corresponding connecting cables to pass through, so that the connecting cables extend from the side of the mounting bracket facing the coil to the side of the mounting bracket facing away from the coil.

[0020] According to this application, the connecting cable passes through the wire hole to extend to the side of the mounting bracket opposite to the coil.

[0021] Optionally, the first limiting structure is configured as a first groove to accommodate the power board connection segment, the first groove comprising:

[0022] A first blocking wall is disposed on the side of the mounting bracket facing away from the coil disc; and

[0023] A second barrier wall is connected to the end of the first barrier wall away from the mounting bracket on the side of the first barrier wall facing the central axis of the electromagnetic heating assembly.

[0024] According to this application, the construction method of the first limiting structure is simple.

[0025] Optionally, the electromagnetic heating assembly further includes a transmission device for connecting the driving device and the coil disk, the transmission device having a hollow structure.

[0026] One of the enameled wire and the connecting cable passes through the hollow structure to connect with the other of the enameled wire and the connecting cable.

[0027] According to this application, the transmission device can reduce weight by setting a hollow structure, the enameled wire and the connecting cable are connected through the hollow structure, and the electromagnetic heating component has a compact structure.

[0028] Optionally, the first limiting structure is configured as an arc-shaped groove with the central axis of the electromagnetic heating assembly as its axis, to accommodate the power board connection section.

[0029] According to this application, the connecting cable extends within the arcuate groove, thereby contacting the arcuate surface. As a result, during its movement, the connecting cable rolls and rubs against the groove wall, resulting in minimal wear.

[0030] Optionally,

[0031] The two arc-shaped grooves have the same radius; and / or

[0032] The electromagnetic heating assembly includes N coils, all of which are evenly distributed around the central axis of the electromagnetic heating assembly along the circumferential direction of the electromagnetic heating assembly. The angular distance between the two ends of the arc-shaped groove along the circumferential direction of the electromagnetic heating assembly is not less than 180 / N degrees, where N≥2.

[0033] According to this application, the two arc-shaped grooves have the same radius, which simplifies the design. The arc-shaped grooves should be as long as possible to allow for greater contact with the connecting cable, thus better restricting the cable's position.

[0034] Optionally, the two connecting cables have different lengths, wherein the length of the arcuate groove corresponding to the longer connecting cable is greater than the length of the arcuate groove corresponding to the shorter connecting cable.

[0035] According to this application, the length of the limiting groove changes with the length of the connecting cable, thus balancing material saving and limiting the connection cable.

[0036] Optionally, the two arcuate grooves are arranged symmetrically about the bisector at one end near the drive device.

[0037] Furthermore, the shorter arcuate groove and a segment of the longer arcuate groove near the drive device are symmetrically arranged about the bisector.

[0038] According to this application, the two first limiting structures are arranged as symmetrically as possible, which can make at least part of the two connecting cables run symmetrically, thereby simplifying the design.

[0039] Optionally,

[0040] The distance between the two ends of the enameled wire is not less than 20mm; and / or

[0041] The bisector intersects the central axis of the electromagnetic heating assembly.

[0042] According to this application, the two ends of the enameled wire are spaced apart to prevent electromagnetic interference and high-voltage breakdown between them. The bisector of the dimension of the electromagnetic heating component along the first direction intersects the central axis of the electromagnetic heating component, thus giving the electromagnetic heating component a basically symmetrical structure, which simplifies the design.

[0043] Optionally,

[0044] The cross-sectional area of ​​the connecting cable is not less than the cross-sectional area of ​​the enameled wire; and / or

[0045] The surface area per unit length of the connecting cable is not less than the surface area per unit length of the enameled wire.

[0046] According to this application, since the connecting cable is connected in series with the enameled wire, if the cross-sectional area of ​​the connecting cable is smaller than that of the enameled wire, the connecting cable becomes a resistor relative to the enameled wire, hindering current conduction. Furthermore, the connecting cable causes voltage division, resulting in a drop in the voltage of the enameled wire, thus reducing the effective heating power of the IH (Induction Heating) system. According to the IH heating principle, a high-frequency oscillating current actually flows within the enameled wire, with most of the high-frequency current flowing through the surface of the conductor and a small portion flowing inside. Therefore, if the surface area per unit length of the connecting cable harness is smaller than that of the enameled wire, it will affect the high-frequency current flow performance of the enameled wire. A second aspect of this application provides an electromagnetic heating cooking appliance, comprising:

[0047] The electromagnetic heating assembly according to any one of the first aspects;

[0048] A cooking container, comprising a ferromagnetic material, for being coaxially positioned with the electromagnetic heating assembly within the magnetically inductive region of the coil; and

[0049] A power board is disposed at one of two spaced-apart ends of the electromagnetic heating assembly along a second direction. The power board includes a fan, and two connecting sections of the power board are respectively connected to the power board.

[0050] Wherein, the second direction is perpendicular to the first direction, and in the vertical projection of the electromagnetic heating cooking appliance, at least a portion of the fan coincides with the electromagnetic heating component and is located between the two first limiting structures.

[0051] According to this application, the electromagnetic heating assembly can achieve multi-point heat source rotation heating, changing the convection direction of the food and ensuring even heating, thereby improving cooking quality. A connecting cable connects the enameled wire of the coil to the power board. A first limiting structure restricts the routing of the connecting cable. Two first limiting structures are respectively located on both sides of the electromagnetic heating assembly, facilitating the connection cable's avoidance of other structures. The fan and the two first limiting structures do not interfere with each other.

[0052] Optionally, the fan has two sides arranged opposite to each other along the first direction, and the two connecting cables are connected to the power board on the same side of the two sides.

[0053] According to this application, the two connecting cables are close to each other at the connection point on the power board, which facilitates the wiring of the power board. Attached Figure Description

[0054] The following drawings, which are incorporated herein by reference as part of this application, are provided for understanding the application. The drawings illustrate representative embodiments of the application and are used to explain the principles of the application, not to limit it.

[0055] In the attached image:

[0056] Figure 1 This is a side cross-sectional view of an electromagnetic heating cooking appliance according to a specific embodiment of this application;

[0057] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the diagram;

[0058] Figure 3 for Figure 1 A top-view three-dimensional schematic diagram of the electromagnetic heating components and power supply board;

[0059] Figure 4 for Figure 1 A bottom-view 3D schematic diagram of the electromagnetic heating components and power board;

[0060] Figure 5 for Figure 1 A top-view perspective of the electromagnetic heating components and power board, omitting the coil disc;

[0061] Figure 6 for Figure 1 A bottom-view perspective of the electromagnetic heating components and power board, omitting the mounting bracket;

[0062] Figure 7 for Figure 1 An exploded three-dimensional diagram of the electromagnetic heating component and power board.

[0063] Figure 8 for Figure 1 Another bottom-view 3D schematic diagram of the electromagnetic heating components and power board;

[0064] Figure 9 for Figure 1 A bottom view of the electromagnetic heating assembly and power board, omitting the mounting bracket;

[0065] Figure 10 for Figure 1 A bottom view of the electromagnetic heating assembly and power board, omitting the mounting bracket, and showing the coil disc relative to... Figure 9 The position in the middle was rotated clockwise by a certain angle;

[0066] Figure 11 for Figure 1 A bottom view of the electromagnetic heating assembly and power board, omitting the mounting bracket, and showing the coil disc relative to... Figure 9 The position in the middle has been rotated counterclockwise by a certain angle.

[0067] Explanation of reference numerals in the attached figures:

[0068] 100: Cooking utensils

[0069] 200: Cover

[0070] 300: Cooking containers

[0071] 400: Circuit board

[0072] 401: Fan

[0073] 500: Base

[0074] 600: Electromagnetic heating assembly

[0075] 602: Barrier Structure

[0076] 603: Coil

[0077] 604: Rotary joint structure

[0078] 605: Temperature sensor

[0079] 606: Electromagnetic coil

[0080] 607: Winding stand

[0081] 608: Magnetic Conductor

[0082] 609: First Gear

[0083] 610: Mounting bracket

[0084] 611: Second Gear

[0085] 612: Magnetic shield

[0086] 613: Electric motor

[0087] 614: First connecting cable

[0088] 615: Second connecting cable

[0089] 616: Screws

[0090] 617: Screws

[0091] 620: Line Card

[0092] 621: First trench

[0093] 621A: First trench front end

[0094] 621B: First trench rear end

[0095] 622: Second first trench

[0096] 622A: Second first trench front end

[0097] 622B: Second rear end of the first trench

[0098] 623: Line card

[0099] 624: Line Card

[0100] 626: Temperature sensor cable

[0101] 631: Spring

[0102] 635: Coil disc cylindrical part

[0103] 637: Enamelled wire

[0104] 639: Second trench

[0105] 641: First Surface

[0106] 642: Second Surface

[0107] 643: Third Surface

[0108] 644: Cable guide hole

[0109] 645: Installation frame cylindrical part

[0110] 646: First groove

[0111] 647: Sidewall of the first groove

[0112] 648 / 649: Terminals

[0113] 650: First coil connection section

[0114] 651: First Activity Segment

[0115] 652: First power board connection section

[0116] 653: First extension

[0117] 658: First wire guide hole

[0118] 659: Second wire guide hole

[0119] 661: First end of the first connecting cable

[0120] 662: Second end of the first connecting cable

[0121] 663: First connecting part

[0122] 664: Second connecting part

[0123] 665: First Edge

[0124] 666: Bottom wall of the first groove

[0125] 667: Arc-shaped wall

[0126] 668: First end of the second connecting cable

[0127] 669: Second end of the second connecting cable

[0128] 671: Blocking section

[0129] 672: Connecting part

[0130] 681: First Barrier

[0131] 682: Second Barrier

[0132] 683: Third Barrier

[0133] 700: Claypot

[0134] 701: Medium plate

[0135] 702: Connecting Post

[0136] 703: Inner cylinder

[0137] 705: Receiving cavity

[0138] 707: Casing

[0139] BL: Bisector

[0140] DA: Axial direction

[0141] DC: Circumferential direction

[0142] P1: Central axis of electromagnetic heating assembly

[0143] P2: Central axis of the cooking container

[0144] P3: Center axis of the coil Detailed Implementation

[0145] The following description provides numerous specific details to offer a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with this application.

[0146] To fully understand this application, a detailed description will be provided in the following description. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. Obviously, the implementation of the embodiments of this application is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other embodiments.

[0147] The ordinal numbers such as “first” and “second” used in this application are merely identifiers and have no other meaning, such as a specific order. Furthermore, for example, the term “first component” does not imply the existence of a “second component,” and the term “second component” does not imply the existence of a “first component.” The use of words such as “first,” “second,” and “third” does not indicate any order and can be interpreted as names.

[0148] It should be noted that the terms “upper,” “lower,” “front,” “back,” “left,” “right,” “inner,” “outer,” and similar expressions used in this application are for illustrative purposes only and are not intended to be limiting.

[0149] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0150] Unless otherwise stated, the numerical ranges in this document include not only the entire range within its two endpoints, but also the subranges contained therein.

[0151] This application provides an electromagnetic heating component for an electromagnetic heating cooking appliance and an electromagnetic heating cooking appliance using the electromagnetic heating component.

[0152] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings.

[0153] like Figure 1 As shown, the electromagnetic instant heating cooking appliance 100 according to a specific embodiment of this application includes a pot body 700, a lid 200, and a base 500. The pot body 700 is used for cooking and heating, and includes, for example, a cooking container 300 for holding food and an electromagnetic heating element 600 (IH heating element 600) for heating the cooking container 300. The cooking container 300 is removably disposed in a receiving cavity 705 of the pot body 700. The IH heating element 600 is disposed, for example, at the bottom of the receiving cavity 705. Thus, the cooking container 300 and the electromagnetic heating element 600 are detachably placed in the magnetically inductive area of ​​the electromagnetic heating element 600. The lid 200 is connected to the pot body 700 and is used to close the pot body 700. For example, the lid 200 can be flipped upwards to open the pot body 700 and flipped downwards to close the pot body 700. The base 500 is connected to the pot body 700. The base 500 is located at the bottom of the cooking appliance 100 and is used to support the pot body 700.

[0154] The directions “up,” “down,” “front,” “back,” “left,” “right,” “inner,” and “outer” in this application refer to the positions of the cooking utensil 100 under normal use.

[0155] The pot body 700 includes, for example, a shell 707, a middle plate 701, and an inner cylinder 703. The middle plate 701 is located inside the shell 707, at the top of the pot body 700, forming at least the upper surface of the pot body 700. The inner cylinder 703 is connected to the middle plate 701 and extends vertically. The base 500 is connected, for example, to the shell 707 and / or the middle plate 701. More broadly, the shell 707 and the base 500 enclose a receiving cavity 705, which is separated by the middle plate 701 and the inner cylinder 703. The shell 707, base 500, middle plate 701, and inner cylinder 703 all provide walls for the receiving cavity 705. The space between the middle plate 701 and the shell 707 can be used to mount components of the pot body 700, such as a fan, circuit board, etc. The interior of the inner cylinder 703 is used to house the cooking container 300. The inner cylinder 703 surrounds the cooking container 300. By incorporating the inner cylinder 703, the heat generated by the cooking container 300 is reflected back to the cooking container 300, preventing heat loss and overheating of the pot body 700. This improves both the heat retention of the cooking container 300 and the safety of the cooking appliance 100. The inner cylinder 703 can be understood as a side wall of the receiving cavity 705. The base 500 provides the bottom wall of the receiving cavity 705.

[0156] The electromagnetic heating element 600 has a central axis P1, and the magnetic field strength of the alternating magnetic field generated by the electromagnetic heating element 600 is non-uniformly distributed along the circumferential direction of the electromagnetic heating element. The cooking container 300 has a central axis P2. The cooking container 300 is generally in the shape of a body of revolution about the central axis P2 (e.g., having a circular cross-section). The cooking container 300 is used to be disposed within the magnetically inductive region of the electromagnetic heating element 600, for example, disposed detachably from the electromagnetic heating element within this magnetically inductive region. When the cooking container 300 is placed in the receiving cavity 705, the central axis P2 of the cooking container coincides with or substantially coincides with the central axis P1 of the electromagnetic heating element. Thus, the alternating magnetic field of the electromagnetic heating element 600 is non-uniformly distributed along the circumference of the cooking container 300.

[0157] The cooking appliance 100 is configured such that at least a portion of the electromagnetic heating component 600 can rotate relative to the cooking container 300, so that the alternating magnetic field of the electromagnetic heating component 600 and the cooking container 300 rotate relative to each other, thereby allowing the cooking container 300 to be heated evenly.

[0158] For example, in the illustrated embodiment, the cooking appliance 100 is configured such that at least a portion of the electromagnetic heating assembly 600 is rotatable relative to the cooking container 300 about the central axis P1 of the electromagnetic heating assembly.

[0159] Specifically, such as Figures 2 to 7As shown, the electromagnetic heating assembly 600 includes, for example, a coil disk 603, at least one electromagnetic coil 606, a mounting bracket 610, a transmission device, and a drive device. The coil disk 603 is rotatable, specifically rotatable about the central axis P1 of the electromagnetic heating assembly, which is also, for example, the central axis P3 of the coil disk 603. The coil disk 603 is, for example, disc-shaped, and its shape is adapted to the bottom shape of the cooking container 300. The electromagnetic coil 606 is disposed on the coil disk 603, for example, on the bottom surface of the coil disk 603, and is thus driven to rotate by the coil disk 603. When energized, the electromagnetic coil 606 generates the aforementioned alternating magnetic field, thereby inducing electromagnetic induction with the cooking container 300, heating the cooking container 300, and subsequently heating the food inside the cooking container 300. The coil disk 603 is disposed on the mounting bracket 610 and is rotatable relative to the mounting bracket 610 about the central axis P3 of the coil disk. Mounting bracket 610 is a component that supports various functional parts within the electromagnetic heating assembly 600, such as for detachable connection to the cavity wall (e.g., inner cylinder 703 or base 500) of the receiving cavity 705. Mounting bracket 610 is, for example, constructed in a basin shape. A drive unit is disposed on mounting bracket 610 for providing driving force to rotate coil disk 603. A transmission device connects coil disk 603 and drive unit, thereby driving coil disk 603 to rotate via transmission device.

[0160] The axial direction of the coil 603 is also the axial direction DA of the electromagnetic heating element 600. The circumferential direction of the coil 603 is also the circumferential direction DC of the electromagnetic heating element 600. The radial direction of the coil 603 is also the radial direction of the electromagnetic heating element 600. In actual use of the cooking appliance 100, the axial direction of the coil 603 is the up-down direction.

[0161] The electromagnetic heating assembly 600 can be mounted to the cavity wall of the receiving cavity 705 using the mounting bracket 610, allowing the electromagnetic heating assembly to be pre-assembled as a whole before being installed in the receiving cavity 705. For example, the mounting bracket 610 can be detachably connected to the inner cylinder 703. This avoids installing individual components one by one in the receiving cavity 705, such as one by one to the base 500, avoiding the influence of the installation accuracy of the components at the mounting positions. This ensures high installation accuracy among the multiple components of the electromagnetic heating assembly 600, facilitating assembly in the cooking appliance 100, guaranteeing the normal operation and cooking effect of the cooking appliance 100, and improving the user experience.

[0162] For example, such as Figure 5As shown, the electromagnetic coil 606 and the coil disk 603 are not concentrically arranged. "Not concentric" means that the spiral center of the coil 606's winding is not collinear with the central axis of the coil disk 603, that is, the winding center of the coil 606 deviates from the central axis P3 of the coil disk. For example, the electromagnetic heating assembly 600 includes only one electromagnetic coil 606, and the winding center of the electromagnetic coil 606 deviates from the central axis of the coil disk 603. Alternatively, the electromagnetic heating assembly 600 includes at least two electromagnetic coils 606, all of which are spaced apart along the circumferential direction of the electromagnetic heating assembly 600. For example, the electromagnetic heating assembly 600 includes N electromagnetic coils 606, all of which are equally spaced along the circumferential direction of the electromagnetic heating assembly, where N is a natural number greater than or equal to 2. Preferably, N is less than or equal to 6. In the illustrated embodiment, the electromagnetic heating assembly 600 includes three electromagnetic coils 606, all of which are equally spaced (120-degree circumferential angle) along the circumferential direction of the electromagnetic heating assembly.

[0163] In this paper, all electromagnetic coils 606 are equally spaced along the circumferential direction of the electromagnetic heating assembly. This can be understood as the center point of each electromagnetic coil 606 being on the same circle with a point on axis P1 as the center, and the center points of all electromagnetic coils 606 being equally spaced on this circle. The coil disk 603 and all electromagnetic coils 606 form a rotationally symmetrical structure with axis P1 as the rotational symmetry center and 360 / N degrees as the rotation angle.

[0164] The number of electromagnetic coils 606 is determined according to the required electromagnetic heating power. Multiple electromagnetic coils 606 can be connected in series, for example, by being individually wound (coiled) from a single enameled wire 637, allowing multiple coils 606 to operate simultaneously. Alternatively, each electromagnetic coil 606 can be wound with its own enameled wire, allowing each to operate independently. The enameled wire 637 can be multi-stranded.

[0165] The magnetic field strength is strong and the heating effect is obvious in the area with coil 606; the magnetic field strength is weak and the heating effect is not obvious in the area between two coils 606. The rotation of the coil disk 603 around the central axis P3 of the coil disk relative to the mounting bracket 610 causes the alternating magnetic field of the coil 606 to rotate around the central axis P3 of the coil disk relative to the mounting bracket 610. By setting non-concentric coils, a multi-point heat source rotation heating effect can be achieved in the cooking appliance 100, thereby realizing a variable heating convection pattern. This enables complex and varied convection tumbling patterns and effects inside the cooking container 300, making food heated more evenly and improving the undesirable phenomenon of rice being overcooked or dry in some areas after cooking.

[0166] like Figure 2As shown, the axial section of the coil 603 includes a C-shaped structure, with the cooking container 300 located inside the C-shaped structure. This allows the coil 603 to conform to the bottom shape of the cooking container 300, reducing the distance between the alternating magnetic field and the cooking container 300. This allows the alternating magnetic field to act more effectively on the cooking container 300, improving heating efficiency. The coil 606 is positioned on the side of the coil 603 facing the mounting bracket 610 to avoid exposure within the receiving cavity 705. The coil 606 is located on the outside of the C-shaped structure.

[0167] Optionally, such as Figure 2 and Figure 7 As shown, the electromagnetic heating assembly 600 also includes a winding frame 607, which is disposed on the bottom surface of the coil disc 603. The winding frame 607 is correspondingly disposed with the electromagnetic coil 606, and the electromagnetic coil 606 is disposed on the winding frame 607, that is, wound on the winding frame 607. The winding frame 607 may be constructed as a sandwich structure, with a winding post disposed at the center of the sandwich, and the enameled wire of the coil 606 is wound around the winding post in the sandwich as a disc-shaped winding. The winding frame 607 and the coil disc 603 can be connected by screws. By placing the electromagnetic coil 606 in a coiled state in the winding frame 607, it is convenient to assemble the electromagnetic coil 606 on the coil disc 603, and it can also effectively prevent the electromagnetic coil 606 from falling apart, thereby improving the stability of the electromagnetic coil 606 itself.

[0168] Optionally, such as Figure 2 and Figure 7 As shown, the electromagnetic heating assembly 600 also includes at least one magnetic guide 608. The magnetic guide 608 is disposed, for example, on the bottom surface of the winding frame 607 and corresponding to the electromagnetic coil 606, and can guide the electromagnetic field generated when the electromagnetic coil 606 is energized to converge towards the cooking container 300. The magnetic guide strip and the winding frame 607 can be fixed by snap-fit. In the illustrated embodiment, multiple magnetic guides 608 are provided corresponding to each electromagnetic coil 606. The magnetic guide 608 is constructed, for example, as a long strip of magnetic guide strip, with multiple magnetic guide strips evenly spaced along the circumferential direction of the coil 606, forming a radial star shape. The magnetic guide 608 can also be configured as a ring-shaped magnetic guide strip. By providing magnetic guides 608 corresponding to the electromagnetic coil 606, the magnetic field generated by the energized electromagnetic coil 606 can be guided to act on the cooking container 300 of the cooking appliance 100, improving heating efficiency.

[0169] Optionally, such as Figure 2 and Figures 5 to 7As shown, the driving device of the electromagnetic heating assembly 600 includes a motor 613. The motor 613 can be a stepper motor, used to provide the driving force to rotate the coil 603. Through stepper motor rotation control and transmission device, the coil 603 can achieve forward and reverse rotation, intermittent rotation, and stepless speed regulation. Preferably, the electromagnetic heating assembly 600 also includes a magnetic shielding cover 612, which covers the motor 613 to isolate electromagnetic interference between the motor 613 and the electromagnetic coil 606. The magnetic shielding cover 612 can be made of materials with magnetic shielding functions such as aluminum or copper.

[0170] Optionally, the transmission device of the electromagnetic heating assembly 600 includes a first gear 609 and a second gear 611. The first gear 609 is coaxially connected to the coil disk 603. The second gear 611 is connected to the output shaft of the motor 613 and meshes with the first gear 609 for transmission. The first gear 609 and / or the second gear 611 can be hollowed out, i.e., have weight-reducing holes, which can reduce the weight of the product. By using a gear pair, it is easy to set in a very small space, and the driving force of the motor 613 can be transmitted to the coil disk 603 at various preset transmission ratios.

[0171] Preferably, the first gear 609 and the second gear 611 are non-metallic gears. Specifically, they can be made of plastic materials, such as POM, GFPP, PBT, PA66, etc. In this embodiment, POM is preferred. Since the gear pair is close to the coil, setting the gear pair as non-metallic gears can avoid electromagnetic induction with the coil.

[0172] Optionally, the gear ratio between the second gear 611 and the first gear 609 can be any one of 1:1, 1:2, 1:3, and 1:4. Considering the product's space layout, a gear ratio of 1:3 is preferred to facilitate stepper motor speed adjustment and rotation angle control. For example, the transmission result allows the coil disk 603 to rotate within a range of 0.1 r / min to 10 r / min. A preferred rotational speed is 1 r / min.

[0173] Optionally, such as Figure 2 and Figure 7 As shown, a coil coil 603 has a cylindrical portion 635 protruding towards the mounting bracket 610 along the axial direction of the coil coil 603 at approximately its center. The mounting bracket 610 has a cylindrical portion 645 protruding towards the coil coil 603 along the axial direction of the coil coil 603. The cooking appliance 100 is configured such that the cylindrical portion 635 of the coil coil and the cylindrical portion 645 of the mounting bracket are adapted to and rotatably connected, allowing the cylindrical portion 635 of the coil coil to rotate relative to the cylindrical portion 645 of the mounting bracket about the central axis P3 of the coil coil. Therefore, the coil coil 603 can rotate relative to the mounting bracket 610 about the central axis P3 of the coil coil.

[0174] Specifically, the cooking appliance 100 is constructed such that at least one of the mounting bracket cylindrical portion 645 and the coil disc cylindrical portion 635 is located in the other of the mounting bracket cylindrical portion 645 and the coil disc cylindrical portion 635. The coil disc cylindrical portion 635 and the mounting bracket cylindrical portion 645 are connected by a revolute joint structure 604, wherein the axis of the revolute joint structure 604 coincides with the central axis P3 of the coil disc. The revolute joint structure 604 is, for example, a bearing. The coil disc cylindrical portion 635 and the mounting bracket cylindrical portion 645 are, for example, cylinders, nested together, with the axial direction of both cylinders being the axial direction of the coil disc 603. The bearing is located between the two cylinders and is tightly fitted to each of the two cylinders. By providing the revolute joint structure 604 in the middle of the mounting bracket 610 to support the rotation of the coil disc 603, the stability of the rotation of the coil disc 603 is improved, avoiding eccentric rotation that would affect the fit between the mechanisms.

[0175] The rotary joint structure 604 can be configured as a rolling rotary joint structure or a sliding rotary joint structure. Optionally, the rotary joint structure 604 is made of a non-metallic material, such as a non-metallic bearing, specifically plastic, ceramic, or other non-metallic materials. Since the rotary joint structure 604 is close to the coil, by making the rotary joint structure 604 a non-metallic component, electromagnetic induction with the coil 606 can be avoided.

[0176] In the illustrated embodiment, the coil disc cylindrical portion 635 is on the outside, and the mounting bracket cylindrical portion 645 is on the inside. Alternatively, the coil disc cylindrical portion 635 can be on the inside, and the mounting bracket cylindrical portion 645 on the outside. The first gear 609 can, for example, be fitted onto the outer peripheral surface of the coil disc cylindrical portion 635 of the coil disc 603, with the two connected by a key. Alternatively, the coil disc 603 can be integrally injection molded with the first gear 609.

[0177] Preferably, such as Figure 2 As shown, the outer peripheral surface of one of the inner cylindrical mounting bracket portion 645 and the inner cylindrical coil disc portion 635 is provided with a first surface 641 extending radially, and the inner peripheral surface of the other cylindrical mounting bracket portion 645 and the inner cylindrical coil disc portion 635 is provided with a second surface 642 extending radially. The first surface 641 and the second surface 642 are spaced apart along the axial direction of the coil disc 603. The rotary joint structure 604 is located between the first surface 641 and the second surface 642, thereby limiting the rotary joint structure 604 in the axial direction.

[0178] Optionally, such as Figure 2 and Figure 7As shown, the electromagnetic heating assembly 600 also includes a temperature sensor 605. The top of the temperature sensor 605 passes through the coil 603 to resiliently contact the cooking container 300 of the cooking appliance 100. The temperature sensor 605 is disposed in the cylindrical portion 635 of the coil. The temperature sensor 605 can be an NTC-type temperature sensor. The electromagnetic heating assembly 600 also includes a spring 631. A third surface 643 extending radially is provided on the inner circumferential surface of the mounting bracket cylindrical portion 645, and the spring 631 is located between the temperature sensor 605 and the third surface 643. For example, the spring 631 is disposed below the temperature sensor 605, the lower end of the spring 631 is supported on the mounting bracket 610, and the upper end of the spring 631 pushes the temperature sensor 605, thereby enabling the temperature sensor 605 to resiliently contact the cooking container 300 and ensuring temperature measurement effectiveness. The third surface 643 of the mounting bracket 610 is connected to the wire hole 644. That is, the inner circumferential surfaces of the third surface 643 and the wire hole 644 are both part of a continuous surface of the mounting bracket 610, wherein the wire hole 644 is used to allow the cable 626 of the temperature sensor 605 to pass through.

[0179] Both the coil disc cylindrical portion 635 and the mounting bracket cylindrical portion 645 are hollow, which is precisely for mounting the temperature sensor 605. The temperature sensor 605 does not rotate with the coil disc 603.

[0180] Optionally, such as Figure 2 and Figure 7 As shown, the electromagnetic heating assembly 600 also includes a blocking structure 602. The blocking structure 602 includes, for example, a blocking portion 671 and a connecting portion 672. The blocking portion 671 is configured as a blocking ring with its radial direction being the radial direction of the coil disk 603. The connecting portion 672 extends substantially perpendicular to the blocking portion 671. One end of the connecting portion 672 is connected to the blocking portion 671, and the other end is used to connect to a mounting bracket 610, such as a mounting bracket cylindrical portion 645. The connecting portion 672 extends along the axial direction of the coil disk 603, for example, configured as a sleeve (also called a blocking structure cylindrical portion). The connecting portion 672 is located in the coil disk cylindrical portion 635 and connected to the mounting bracket 610 (e.g., snap-fit ​​or threaded connection). The blocking structure 602 is fixed to the mounting bracket 610 so that it does not rotate with the coil disk 603.

[0181] One end of the connecting portion 672 is connected to the middle portion of the radial width of the blocking ring of the blocking portion 671 (not necessarily the midpoint of the blocking ring's width). The outer diameter of the blocking ring of the blocking portion 671 is larger than the inner diameter of the coil disc cylindrical portion 635. The inner diameter of the blocking ring of the blocking portion 671 is smaller than the maximum outer diameter of the temperature sensor 605. The portion of the blocking ring located radially outward of the connecting portion 672 is used to cover the port of the coil disc cylindrical portion 635, that is, to extend outward from the edge of the coil disc cylindrical portion 635 along the radial direction of the coil disc 603, so as to prevent the coil disc 603 from moving away from the mounting bracket 610 along the axial direction of the coil disc 603. The portion of the blocking ring located radially inward of the connecting portion 672 is used to limit the temperature sensor 605, and the through hole in the middle of the blocking ring is used to expose the temperature sensor 605, which can extend out of the through hole under the action of the spring 631.

[0182] The cooking appliance 100 also includes a circuit board 400. The circuit board 400 is mounted on the base 500 or mounting bracket 610, for example, in the form of a P-board. Figure 8 As shown, a control device, such as an MCU chip, is mounted on the circuit board 400. The control device controls the operation of all the electronic components of the cooking appliance 100. Preferably, the circuit board 400 is mounted on the mounting bracket 610 and electrically connected to the electromagnetic coil 606, the motor 613, and the temperature sensor 605 via cables. The circuit board 400 can be a power supply board, i.e., for direct connection to mains power. A fan 401 is provided on the power supply board for heat dissipation.

[0183] Preferably, the mounting bracket 610 is provided with openings for cables or connecting cables of the electrical components of the electromagnetic heating assembly 600 to pass through, so that these cables are connected to the circuit board 400 on the side of the mounting bracket 610 facing away from the coil disk 603 for easy assembly. In this application, each cable and connecting cable of the electrical components of the electromagnetic heating assembly 600 is referred to as a functional component wiring. Further, a wire groove is provided on the side of the mounting bracket 610 facing away from the coil disk 603 to accommodate these functional component wirings. A wire clip may also be provided on the side of the mounting bracket 610 facing away from the coil disk to limit the movement of these functional component wirings.

[0184] like Figures 6 to 8As shown, the main functional component wiring of the electromagnetic heating assembly 600 includes a first connecting cable 614 and a second connecting cable 615. The first connecting cable 614 is connected at both ends to the first end of the enameled wire 637 forming the electromagnetic coil 606 and the circuit board 400, respectively. The second connecting cable 615 is connected at both ends to the second end of the enameled wire 637 forming the electromagnetic coil 606 and the circuit board 400, respectively. Because the first connecting cable 614 and the second connecting cable 615 need to rotate with the coil disc 603, both cables are provided with U-shaped bends to allow for deformation and prevent tangling during rotation with the coil disc 603.

[0185] The electromagnetic heating element 600 is constructed such that the alternating magnetic field has N strong magnetic regions and N weak magnetic regions alternately distributed along the circumferential direction of the electromagnetic heating element 600, wherein the magnetic field strength of the strong magnetic regions is greater than that of the weak magnetic regions. Preferably, the N strong magnetic regions are equally spaced along the circumferential direction of the electromagnetic heating element 600, and the N weak magnetic regions are equally spaced along the circumferential direction of the electromagnetic heating element 600. Considering the limited length of the connecting cable of the enameled wire of the coil 606, the rotation angle range of the coil disc 603 is, for example, 360 / N degrees (±180 / N degrees), so that no part of the heating is missed, and the cooking container 300 is heated evenly and comprehensively. That is, the coil disc 603 only needs to rotate within a preset angle of less than 360 degrees, without having to rotate a full circle. For example, in the illustrated embodiment, N=3, and the rotation angle range of the coil disc 603 is 120 degrees. Or, the coil disc 603 rotates from a neutral position (e.g., Figure 9 (As shown) Rotate 60 degrees to each side (as shown) Figure 10 and Figure 11 (As shown).

[0186] The wiring methods for the first connecting cable 614 and the second connecting cable 615 are similar. The following explanation uses the first connecting cable 614 as an example.

[0187] As mentioned above, Figure 6As shown, the first end 661 of the connecting cable 614 is electrically connected to one end of the enameled wire 637, and the second end 662 of the connecting cable 614 is connected to the circuit board 400. For example, the coil 603 has a terminal 648 near the cylindrical portion 635 of the coil 603, and the first end 661 of the connecting cable 614 and the end of the enameled wire 637 are electrically connected at the terminal 648. For example, the first end 661 of the connecting cable 614 is fixed to the terminal 648 by a fastener (e.g., a screw 617). The second end 662 of the connecting cable 614 is fixed to the circuit board 400, for example, by a fastener (e.g., a screw 616). Thus, the first end 661 of the first connecting cable moves with the coil 603 and the coil 606, while the second end 662 of the first connecting cable remains stationary. This ensures that at least a portion of the connecting cable 614 is in motion when the coil 603 rotates. Preferably, the first connecting cable 614 and the second connecting cable 615 are configured as highly flexible drag chain cables. Drag chain cables are suitable for dynamic working conditions and can withstand entanglement, wear, pull-out, and scraping during movement, keeping the cable from becoming tangled.

[0188] At least a portion of the connecting cable 614 is arranged in a U-shape to allow for a length allowance. Specifically, the connecting cable 614 includes a first connecting portion 663 and a second connecting portion 664. The first connecting portion 663 rotates synchronously with the coil 606 around the central axis P1 of the electromagnetic heating assembly, while the second connecting portion 664 does not rotate with the coil 606 around the central axis P1 of the electromagnetic heating assembly, resulting in a U-shaped bend in the portion of the connecting cable 614 located between the first connecting portion 663 and the second connecting portion 664. Cable fixing structures are provided at both the first connecting portion 663 and the second connecting portion 664. For example, the cable fixing structure at the first connecting portion 663 is a terminal block 648, and the cable fixing structure at the second connecting portion 664 is a cable clip 620.

[0189] In order to ensure that the first connecting cable 614 always maintains a U-shaped bend, such as Figure 6 and Figure 8As shown, the electromagnetic heating assembly 600 also includes a first blocking wall 681 and a third blocking wall 683. The first blocking wall 681 is correspondingly disposed with respect to the connecting cable 614. The third blocking wall 683 is correspondingly disposed with respect to the first blocking wall 681, and thus also with respect to the connecting cable 614. The third blocking wall 683 is disposed opposite to the first blocking wall 681 along the radial direction of the electromagnetic heating assembly 600. The first connecting portion 663 and the second connecting portion 664 are located between the first blocking wall 681 and its extension and the third blocking wall 683 and its extension, such that the portion of the connecting cable 614 located between the first connecting portion 663 and the second connecting portion 664 abuts against the first blocking wall 681 and the third blocking wall 683 at different locations, forming a U-shaped bend. That is, for example, the connecting cable 614 first extends against the third blocking wall 683, then the connecting cable 614 bends into a U-shape, and then extends against the first blocking wall 681.

[0190] Since the third blocking wall 683 is disposed opposite to the first blocking wall 681, each of them exerts a force on the connecting cable 614 toward the other, allowing the connecting cable 614 to abut against the two blocking walls using its own bending resistance. In other words, the first blocking wall 681 and the third blocking wall 683 sandwich the U-shaped portion of the connecting cable 614 in the middle, and simultaneously force that portion to form a U-shape. The third blocking wall 683 and the first blocking wall 681 can guide and limit the wiring of the connecting cable 614 in the radial direction of the electromagnetic heating assembly 600, preventing the connecting cable 614 from deforming arbitrarily and reducing the risk of damage. Preferably, the third blocking wall 683 and the first blocking wall 681 are configured as coaxial arc walls.

[0191] Preferably, the first connecting portion 663 is connected to the coil disk 603, for example, to the side of the coil disk 603 facing the mounting bracket 610, so that the first connecting portion 663 can rotate with the coil disk 603. For example, the first connecting portion 663 is the first end 661 of the first connecting cable. Preferably, a third blocking wall 683 is also provided on the coil disk 603, for example, on the side of the coil disk 603 facing the mounting bracket 610. Preferably, the coil disk cylindrical portion 635 provides the third blocking wall 683. Thus, the electromagnetic heating assembly 600 has a compact structure.

[0192] Preferably, the second connection portion 664 is connected to the mounting bracket 610, thereby keeping the second connection portion 664 in a fixed position. To facilitate connection of the second end 662 of the connecting cable 614 to the circuit board 400, the second end 662 of the connecting cable is connected to the circuit board 400 on the side of the mounting bracket 610 opposite to the coil disc 603. Therefore, preferably, the second connection portion 664 is connected to the side of the mounting bracket 610 opposite to the coil disc 603. For example, as... Figure 8As shown, the connecting cable 614 is secured to the surface of the mounting bracket 610 at the second connection portion 664 by fasteners (e.g., wire clips 620). Preferably, the first blocking wall 681 is also provided on the side of the mounting bracket 610 facing away from the coil disc 603. The second connection portion 664 is located between the portion of the connecting cable 614 that contacts the first blocking wall 681 and the second end 662 of the first connecting cable. Thus, the electromagnetic heating assembly 600 has a compact structure.

[0193] To allow the connecting cable 614 to pass through the mounting bracket 610, the mounting bracket 610 is provided with a first wire-passing hole 658, which is correspondingly provided with the first connecting cable 614 for passage. Thus, the connecting cable 614 extends along the third blocking wall 683 of the coil disc cylindrical portion 635, then extends from the first wire-passing hole 658 to the side of the mounting bracket 610 opposite to the coil disc 603, bends into a U-shape after extending from the first wire-passing hole 658, and then extends along the first blocking wall 681.

[0194] The first gear 609 is engaged with the outer periphery of the cylindrical portion 635 of the coil disc, located below the disc body of the coil disc 603. A terminal 648 is disposed within the hollow structure of the first gear 609, extending downwards from the lower surface of the disc body of the coil disc 603. An enameled wire 637 can pass downwards through the hollow structure of the first gear 609 to connect with the connecting cable 614. Alternatively, the connecting cable 614 can pass upwards through the first gear 609 to connect with the enameled wire 637.

[0195] Preferably, the first blocking wall 681 and the first wire-passing hole 658 are arranged opposite each other along the radial direction of the electromagnetic heating assembly 600, and the first wire-passing hole 658 is located between the first blocking wall 681 and the central axis P1 of the electromagnetic heating assembly along the radial direction of the electromagnetic heating assembly 600. This allows the connecting cable 614 to quickly contact the first blocking wall 681 after bending, which is beneficial for the wiring flexibility of the connecting cable 614. The third blocking wall 683, the first wire-passing hole 658, and the first blocking wall 681 are arranged sequentially from the inside to the outside along the radial direction of the electromagnetic heating assembly 600. The connecting cable 614 contacts the side of the third blocking wall 683 facing away from the central axis P1 and the side of the first blocking wall 681 facing the central axis P1.

[0196] like Figure 2 and Figure 8As shown, the mounting bracket 610 is provided with a first recess 646 recessed away from the coil disk 603 along the axial direction DA of the electromagnetic heating assembly 600. For example, in normal use, the coil disk 603 is located above the mounting bracket 610, and the first recess 646 is recessed downwards. A first wire through hole 658 is provided on the sidewall 647 of the first recess 646. This allows the connecting cable 614 to extend approximately in the same plane, avoiding excessive bending of the connecting cable 614.

[0197] like Figure 2 As shown, preferably, the mounting bracket cylindrical portion 645 is disposed on the bottom wall 666 of the first groove 646 (the mounting bracket cylindrical portion 645 is located in the first groove 646). The side wall 647 of the first groove 646 is located on the outer periphery of the coil coil cylindrical portion 635. A first connecting portion 663 is located between the coil coil cylindrical portion 635 and the side wall 647 of the first groove 646, for example, a terminal 648 is located between the coil coil cylindrical portion 635 and the side wall 647 of the first groove 646. Thus, the connecting cable 614 extends in the annular region between the coil coil cylindrical portion 635 and the side wall 647 of the first groove 646, thereby guiding and restricting the wiring of the connecting cable 614.

[0198] like Figure 6 and Figures 9 to 11 As shown, the first connecting cable 614, starting from the first end 661, is sequentially divided into a first coil connecting section 650, a first movable section 651, a first power board connecting section 652, and a first extension section 653. The first coil connecting section 650 is the portion within the first groove 646 that fits against the coil disc-shaped portion 635, used to connect the enameled wire 637. The first movable section 651 is the portion extending from the first wire through hole 658 and used for bending, i.e., the U-shaped bend. The first power board connecting section 652 is the portion that fits against the first blocking wall 681, used to connect the power board 400. The boundary between the first power board connecting section 652 and the first extension section 653 is approximately at the second connecting portion 664. From the second connecting portion 664 to the second end 662 of the first connecting cable is the first extension section 653, which ultimately connects to the power board 400.

[0199] The first connection portion 663 is the end of the first coil connection section 650 that is not connected to the first movable section 651. The second connection portion 664 is the end of the first power board connection section 652 that is not connected to the first movable section 651.

[0200] Understandably, both ends of the first extension section 653 are fixed, representing the non-moving, shape-unchanged portion of the first connecting cable 614. The first coil connecting section 650, the first movable section 651, and the first power board connecting section 652 are the portions that move and change shape with the coil disc 603. The first movable section 651 is located between the first coil connecting section 650 and the first power board connecting section 652. The boundary point between the first coil connecting section 650, the first movable section 651, and the first power board connecting section 652 is not fixed. Figure 10 and Figure 11 As shown in the diagram, at the two extreme positions of the coil disk 603's rotation, the lengths of the first coil connecting segment 650 and the first power board connecting segment 652 change in opposite directions (one increases and the other decreases); the length, shape, and curvature of the first movable segment 651 remain essentially unchanged, but its position changes. In other words, when the coil disk 603 rotates, the length of the first power board connecting segment 652 changes, causing it to transform into the first movable segment 651; the length of the first coil connecting segment 650 also changes, causing it to transform into the first movable segment 651. The first wire-passing hole 658 has a certain opening area to avoid interfering with the first movable segment 651.

[0201] Preferably, the coil disc cylindrical portion 635 is constructed as a cylinder with the central axis P1 as its axis. For example... Figure 8 As shown, the opening of the first wire hole 658 has a first edge 665 near the first connection portion 663 (e.g., the first end 661 of the first connecting cable), and the first edge 665 is located on the sidewall 647 of the first groove 646. At least the portion of the sidewall 647 of the first groove 646 adjacent to the first edge 665 is constructed as an arcuate wall 667 with the central axis P1 of the electromagnetic heating assembly 600 as its axis. That is, starting from the first edge 665, the sidewall 647 of the first groove 646 is arcuate. That is, the coil coil portion 635 is coaxial with the sidewall 647 of the first groove 646. Thus, the first coil connecting section 650 has a generally arcuate arcuate groove 639 between the coil coil portion 635 and the sidewall 647 of the first groove 646 (see...). Figure 2 Extending in the middle, it bends in an arc shape. During the rotation of the coil disk 603, it has rolling friction with the cylindrical part of the coil disk 635, without sliding friction, resulting in minimal wear.

[0202] The outer diameter of the coil disc cylindrical portion 635 is, for example, 20 to 50 mm. It can also be understood that the radius R2 of the arcuate surface of the arcuate groove 639 used to fit the connecting cable 614 is 20 to 50 mm.

[0203] Understandably, the terminal block 648 and the first end 661 of the first connecting cable 614 are both located between the coil disc 635 and the side wall 647 of the first groove 646.

[0204] Preferably, the first movable segment 651 is bent into a semi-circle. Preferably, the first blocking wall 681 is constructed as an arc-shaped wall with the central axis P1 of the electromagnetic heating component 600 as its axis. In this way, during the rotation of the coil 603, the first power board connecting segment 652 and the first blocking wall 681 experience rolling friction, with no sliding friction, resulting in minimal wear. Excessive bending of the first movable segment 651 would increase the length of the connecting cable 614, raising costs; it would also prevent the connecting cable 614 from tightly fitting the first blocking wall 681 using its own bending resistance. Furthermore, the dimensions of the mounting bracket 610 also limit the radial span of the first movable segment 651. The first movable segment 651 should not be bent too small either, as this would increase the risk of cable sheath damage; in addition, larger bending deformation results in stronger bending resistance, reducing the cable's flexible deformation capacity, increasing the rotational resistance of the coil 603, and posing a risk of jamming. The radius R1 of the inner arcuate surface of the first blocking wall 681 (i.e. the surface in contact with the connecting cable 614) is, for example, 60-150 mm.

[0205] Preferably, such as Figure 9 As shown, the distance 'a' between the coil disc cylindrical portion 635 and the first blocking wall 681 in the radial direction of the electromagnetic heating assembly 600 is 20mm-90mm, for example, 40mm-60mm. The radius 'r' of the semicircle of the first movable segment 651 is approximately a / 2.

[0206] The rotation range of the coil 603 is 360 / N degrees. Preferably, the angular distance between the two ends of the first blocking wall 681 along the circumferential direction DC of the electromagnetic heating assembly 600 is not less than 180 / N degrees. That is, the first blocking wall 681 needs to have a certain circumferential length so that the connecting cable 614 can always contact the first blocking wall 681.

[0207] like Figure 8 As shown, the electromagnetic heating assembly 600 also includes a second blocking wall 682. The second blocking wall 682 is correspondingly disposed to the first blocking wall 681, that is, corresponding to the connecting cable 614. The second blocking wall 682 is connected to the end of the first blocking wall 681 away from the mounting bracket 610 on the side of the first blocking wall 681 facing the central axis P1 of the electromagnetic heating assembly 600. Thus, the surface of the mounting bracket 610, the first blocking wall 681, and the second blocking wall 682 form a generally arc-shaped first groove 621 (see...). Figure 4The first power board connection segment 652 is accommodated by a second barrier wall 682. The second barrier wall 682 limits the axial position of the connecting cable 614 (specifically, the first power board connection segment 652). It is understood that the first groove 621 is provided corresponding to the first power board connection segment 652.

[0208] Thus, the first groove 621 becomes the first limiting structure for limiting the connecting cable 614, and the arc groove 639 (also called the second groove) becomes the second limiting structure for limiting the connecting cable 614. Both limiting structures are constructed as groove structures. The first limiting structure is disposed on the mounting bracket 610. The second limiting structure is formed between the coil disc 603 and the mounting bracket 610. The first groove 621 of the first limiting structure is used to accommodate the first power board connection segment 652, so that the first power board connection segment 652 is engaged with the first limiting structure, thereby limiting the first power board connection segment 652. The second groove 639 of the second limiting structure is used to accommodate the first coil connection segment 650, so that the first coil connection segment 650 is engaged with the second limiting structure, thereby limiting the first coil connection segment 650. The first movable segment 651 is disengaged from both the second and second limiting structures. The first and second limiting structures are correspondingly provided with the connecting cable.

[0209] like Figure 6 and Figure 8 As shown, the first end 668 of the second connecting cable 615 is connected to the enameled wire 637, and the second end 669 of the second connecting cable 615 is connected to the power board 400. The second connecting cable 615 also has corresponding terminals 649, wire clips 620, second wire through holes 659, second first grooves 622, and second grooves. Thus, the second connecting cable 615 is arranged in a similar manner to the first connecting cable 614 and exhibits the same deformability as the first connecting cable 614 during movement (e.g., it also has a coil connection section, a movable section, a power board connection section, and an extension section), which will not be elaborated further here. Preferably, the two first grooves 621 and 622 have the same radius. Preferably, the second groove of the second connecting cable 615 communicates with the second groove of the first connecting cable 614, or they are different parts of the same groove.

[0210] The mounting bracket 610 also serves to separate the coil 606 from the connecting cables 614 and 615. As a spacer, the mounting bracket 610 has two opposing sides, with the coil 606 positioned on one side and the connecting cables 614 and 615 extending from that side to the other. In the vertical projection of the electromagnetic heating cooking appliance 100, at least a portion of the coil 606, at least a portion of the first connecting cable 614, and at least a portion of the spacer overlap. In the vertical projection of the electromagnetic heating cooking appliance 100, at least a portion of the coil 606, at least a portion of the second connecting cable 615, and at least a portion of the spacer overlap. The spacer physically separates the coil from the connecting cables, preventing the connecting cables from rubbing against the coil and coil coil, thus protecting both the coil and the connecting cables.

[0211] Of course, the spacer can also be a separate component independent of the mounting bracket 610. The coil 606 can be entirely located on the same side of the spacer, or partially located on one side of the spacer and partially on the other side. Each of the connecting cables 614 and 615 can be entirely located on the same side of the spacer, or partially located on one side of the spacer and partially on the other side.

[0212] Preferably, the distance between the first end 661 of the first connecting cable 614 and the first end 668 of the second connecting cable 615 is not less than 20mm, that is, the distance between the two ends of the enameled wire 637 is not less than 20mm, so as to prevent electromagnetic interference and high voltage penetration between them.

[0213] Preferably, the first first groove 621 and the second first groove 622 are at least partially axially symmetrically distributed, and their axis of symmetry intersects the central axis P1 of the electromagnetic heating assembly 600. The terminals 649 and 648 are also symmetrically arranged about the same axis of symmetry. The cylindrical shape of the coil disc 635 ensures the symmetry of the third blocking walls of the two connecting cables. Thus, as... Figure 9 As shown, in the neutral position of the coil disk 603, the U-shape of the first connecting cable 614 is basically symmetrical to the U-shape of the second connecting cable 615. The two connecting cables are deformed in the same way, which simplifies the wiring design.

[0214] like Figure 9 As shown, the electromagnetic heating assembly 600 has a bisector BL that bisects the dimension of the electromagnetic heating assembly 600 along a first direction (e.g., the left-right direction). Two first limiting structures (first first groove 621 and second first groove 622) are respectively disposed on both sides of the bisector BL. The bisector BL passes, for example, through the central axis P1. The power supply board 400 is disposed at one of two spaced-apart ends (e.g., the rear side) of the electromagnetic heating assembly 600 along a second direction (e.g., the front-rear direction). The second direction and the first direction are two horizontal directions perpendicular to each other. Figure 8 As can be seen, in the vertical projection of the electromagnetic heating cooking appliance 100, at least a portion of the fan 401 coincides with the electromagnetic heating component 600 and is located between the two first limiting structures 621 and 622. Thus, the two first limiting structures 621 and 622 do not interfere with the fan 401, making full use of the installation space inside the pot body 700.

[0215] The motor 613 is mounted on the other (e.g., the front) of two spaced-apart ends of the electromagnetic heating assembly 600 along a second direction (e.g., the front-to-back direction). The motor 613 is located between two first limiting structures 621 and 622. The two first limiting structures 621 and 622, the motor 613, and the fan 401 do not interfere with each other.

[0216] The fan 401 is located substantially directly behind the electromagnetic heating assembly 600. Two connecting cables 614 and 615 are connected to the power board 400 on the same side (e.g., the left side) of the fan 401, which are arranged opposite to each other along a first direction, resulting in unequal lengths for the two connecting cables 614 and 615. For example, the second connecting cable 615 is longer than the first connecting cable 614. To better restrain the longer second connecting cable 615, the length of the second first groove 622 corresponding to the longer connecting cable 615 is greater than the length of the first first groove 621 corresponding to the shorter connecting cable 614. The two first restraining structures are unequal in length, and at least a portion of the two first restraining structures 621 and 622 are symmetrically arranged about the bisector BL. A portion of the shorter first first groove 621 and a portion of the longer second first groove 622 are symmetrically arranged about the bisector BL.

[0217] Specifically, the shorter first groove 621 and the longer second groove 622 are symmetrically arranged about the bisector BL. For example, the end 621A of the first groove 621 located on the front side of the electromagnetic heating assembly 600 (the end near the motor 613) and the end 622A of the second groove 622 located on the front side of the electromagnetic heating assembly 600 are symmetrically arranged about the bisector BL. The two first grooves 621 and 622 extend in the same circle about the central axis P1. The extension length of the second groove 622 is greater than the extension length of the first groove 621, such that the end 621B of the first groove 621 located on the rear side of the electromagnetic heating assembly 600 and the end 622B of the second groove 622 located on the rear side of the electromagnetic heating assembly 600 are asymmetrical about the bisector BL. The sections of the first groove 621 and the second groove 622 near the motor 613 are symmetrically arranged about the bisector BL.

[0218] Preferably, the cross-sectional area of ​​the connecting cables 614 and 615 is not less than the cross-sectional area of ​​the enameled wire 637 forming the coil 606. Since the connecting cables are connected in series with the enameled wire 637, if the cross-sectional area of ​​the connecting cables is smaller than that of the enameled wire 637, the connecting cables will act as resistors relative to the enameled wire 637, hindering current conduction. Furthermore, the connecting cables will cause voltage drop, leading to a decrease in the voltage of the enameled wire 637 and consequently a decrease in the effective heating power of the IH circuit. Here, the cross-sectional area of ​​the cable refers to the total cross-sectional area. When the cable consists of multiple strands connected in parallel, the cross-sectional area is the sum of the cross-sectional areas of each individual strand.

[0219] Preferably, the surface area per unit length of connecting cables 614 and 615 is not less than the surface area per unit length of enameled wire 637. According to the IH heating principle, high-frequency oscillating current (e.g., 20kHz to 60kHz) actually flows within the enameled wire 637, with most of the high-frequency current flowing through the surface of the conductor and a small portion flowing inside. Therefore, if the surface area per unit length of the connecting cable bundle is less than that of the enameled wire 637, it will affect the high-frequency current flow performance of the enameled wire 637.

[0220] The relative rotation between the cooking container 300 and the magnetic field can occur when the first coil 606 is energized. That is, the magnetic field of the electromagnetic heating component 600 rotates while simultaneously heating the cooking container 300, ensuring uniform heating and reducing the horizontal temperature difference between different parts of the cooking container 300 on the same horizontal plane. Alternatively, the relative rotation between the cooking container 300 and the magnetic field can occur alternately with the energization of the first coil 606; that is, rotation occurs without heating, and heating occurs without rotation. This reduces the vertical temperature difference on the same vertical plane at each circumferential position, achieving uniform heating in one revolution. Alternatively, the heating sequence and the rotation sequence can be controlled independently. In this application, regardless of whether rotation and heating occur simultaneously, uniform heating is achieved by changing the heating position through rotation.

[0221] The cooking process of the cooking appliance 100 includes, for example, a water absorption process, a boiling process, a maintaining boil process, a simmering process, and a heat preservation process. In the water absorption process, the ingredients are soaked in warm water to fully absorb water, improving their texture. In the boiling process, the water is heated to near boiling point, and then maintained at a boil in the maintaining boil process to ensure the ingredients are basically cooked. The simmering process dries out any remaining free moisture, further cooking the ingredients. Finally, the heat preservation process keeps the food warm, allowing the user to enjoy hot food.

[0222] In each step, the electromagnetic heating element 600 (specifically, the electromagnetic coil 606), acting as a heating device, operates in a power-adjusting mode. During each power-adjusting cycle, the electromagnetic coil 606 is energized for a preset energizing time and de-energized for a preset de-energizing time; the sum of the preset energizing and de-energizing times constitutes the duration of one power-adjusting cycle. Due to different cooking objectives or effects, the average power of each step may differ; for example, the preset energizing time may vary between steps. Also, because the cooking cavity may have temperature requirements in each step, the power of the electromagnetic heating element 600 may not be constant (the preset energizing time may differ between different power-adjusting cycles within the same step), and it may not be constantly in operation (in this text, the electromagnetic heating element 600 during a power-adjusting cycle is considered to be in operation).

[0223] The processes and steps described in all the preferred embodiments above are merely examples. Unless adverse effects occur, various processing operations can be performed in a different order than those described above. The order of steps in the above process can also be added, combined, or deleted according to actual needs.

[0224] In understanding the scope of this application, the term "comprising" and its derivatives, as used herein, are intended to be open-ended terms that specify the presence of a described feature, element, component, group, whole, and / or step, but do not exclude the presence of other undescribed features, elements, components, groups, wholes, and / or steps. This concept also applies to words with similar meanings, such as the terms "comprising," "having," and their derivatives.

[0225] The term "attached" or "joined" as used herein includes: a construction in which one element is directly fixed to another element by fixing it directly to another element; a construction in which one element is indirectly fixed to another element by fixing it to an intermediate member, which in turn is fixed to another element; and a construction in which one element is integral with another element, that is, one element is substantially part of another element. This definition also applies to words with similar meanings, such as "connect," "joint," "couple," "install," "adhere," "fix," and their derivatives. Finally, degree terms such as "substantially," "approximately," and "approximately" as used herein indicate the amount of deviation from which modifications to the terminology do not significantly alter the final result.

[0226] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application. Features described in one embodiment may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0227] This application has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this application to the described embodiments. Furthermore, those skilled in the art will understand that this application is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this application, all of which fall within the scope of protection claimed in this application.

Claims

1. An electromagnetic heating assembly for an electromagnetic heating cooking appliance, characterized in that, The electromagnetic heating assembly has a central axis, and comprises: at least two coils formed by winding the same enameled wire, for generating an alternating magnetic field when energized, a winding center of each coil being offset from the central axis of the electromagnetic heating assembly, so that the at least two coils are distributed along a circumferential direction of the electromagnetic heating assembly, the at least two coils being rotatable about the central axis; two connecting cables, each of the connecting cables comprising a coil connecting section, a power board connecting section, and a movable section between the coil connecting section and the power board connecting section, two coil connecting sections being connected to two ends of the enameled wire respectively, and two power board connecting sections being used for connecting to a power board respectively; two first limiting structures, the first limiting structures being arranged at positions corresponding to the power board connecting sections, for limiting positions of the corresponding power board connecting sections, wherein the electromagnetic heating assembly has a bisector bisecting a dimension of the electromagnetic heating assembly in a first direction, and the two first limiting structures are arranged on two sides of the bisector respectively.

2. The electromagnetic heating assembly of claim 1, wherein, At least part of the two first limiting structures are symmetrically arranged about the bisector.

3. The electromagnetic heating assembly of claim 1, wherein, The electromagnetic heating assembly further comprises a driving device for providing a driving force for rotating the at least two coils, the driving device being arranged at one of two end portions of the electromagnetic heating assembly spaced apart in a second direction, wherein the second direction is perpendicular to the first direction.

4. The electromagnetic heating assembly of claim 3, wherein, The electromagnetic heating assembly further comprises: a mounting frame for connecting to an electromagnetic heating cooking appliance, the driving device being arranged at the mounting frame; a coil disc distributed with the mounting frame in an axial direction of the electromagnetic heating assembly, the driving device driving the coil disc to rotate relative to the mounting frame about a central axis of the electromagnetic heating assembly, the coils being arranged at the coil disc, wherein the two first limiting structures are arranged at a side of the mounting frame facing away from the coil disc.

5. The electromagnetic heating assembly of claim 4, wherein, The mounting frame is provided with two wire passing holes corresponding to the connecting cables, for allowing the corresponding connecting cables to pass, so that the connecting cables extend from a side of the mounting frame facing the coil disc to a side of the mounting frame facing away from the coil disc.

6. The electromagnetic heating assembly of claim 4, wherein, The first limiting structure is configured as a first groove for accommodating the power board connecting section, the first groove comprising: a first blocking wall arranged at a side of the mounting frame facing away from the coil disc; and a second blocking wall connected to a distal end of the first blocking wall away from the mounting frame at a side of the first blocking wall facing the central axis of the electromagnetic heating assembly.

7. The electromagnetic heating assembly of claim 4, wherein, The electromagnetic heating assembly further comprises a transmission device for connecting the driving device and the coil disc, the transmission device having a hollow structure, one of the enameled wire and the connecting cable passing through the hollow structure to be connected to the other one of the enameled wire and the connecting cable.

8. The electromagnetic heating assembly of claim 3, wherein, The first limiting structure is configured as an arc-shaped groove with the central axis of the electromagnetic heating assembly as an axis, to accommodate the power board connecting section.

9. The electromagnetic heating assembly according to claim 8, characterized in that, the two arc-shaped grooves have the same radius; and / or the electromagnetic heating assembly comprises N coils, all of which are distributed equidistantly along the circumferential direction of the electromagnetic heating assembly around the central axis of the electromagnetic heating assembly, and the angular distance between the two ends of the arc-shaped groove along the circumferential direction of the electromagnetic heating assembly is not less than 180 / N degrees, N≥2.

10. The electromagnetic heating assembly of claim 8, wherein, The lengths of the two connecting cables are different, wherein the length of the arc-shaped groove corresponding to the longer connecting cable is greater than the length of the arc-shaped groove corresponding to the shorter connecting cable.

11. The electromagnetic heating assembly of claim 10, wherein, The two ends of the two arc-shaped grooves close to the driving device are symmetrically arranged about the bisector.

12. The electromagnetic heating assembly of claim 11, wherein, The shorter arc-shaped groove and the segment of the longer arc-shaped groove close to the driving device are symmetrically arranged about the bisector.

13. The electromagnetic heating assembly according to claim 1, characterized in that, the distance between the two ends of the enameled wire is not less than 20 mm; and / or the bisector intersects the central axis of the electromagnetic heating assembly.

14. The electromagnetic heating assembly according to any one of claims 1 to 13, characterized in that, the cross-sectional area of the connecting cable is not less than the cross-sectional area of the enameled wire; and / or the surface area per unit length of the connecting cable is not less than the surface area per unit length of the enameled wire.

15. An electromagnetic heating cooking appliance, characterized by, comprising: the electromagnetic heating assembly according to any one of claims 1 to 14; a cooking container comprising a ferromagnetic material, for being coaxially placed within the magnetically inducible area of the coil of the electromagnetic heating assembly; and a power board arranged at one of the two end portions of the electromagnetic heating assembly spaced apart in a second direction, the power board comprising a fan, the two power board connecting sections being connected to the power board respectively, wherein the second direction is perpendicular to the first direction, at least part of the fan overlaps the electromagnetic heating assembly and is located between the two first limiting structures in the projection of the electromagnetic heating cooking appliance in the up-down direction.

16. The electromagnetic heating cooking appliance according to claim 15, characterized in that, The fan has two sides arranged oppositely in the first direction, and the two connecting cables are connected to the power board at the same side of the two sides.

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