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 includes at least two coils, at least one connection cable, and a spacer. The coil is formed by coiling an enameled wire and is used for generating an alternating magnetic field when being electrified, the winding center of the coil deviates from the central axis of the electromagnetic heating assembly, so that all the coils are distributed in the circumferential direction 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 end of the connecting cable is connected with the enameled wire, and the second end of the connecting cable is connected to a power panel; the spacer has two opposite sides, at least a portion of the coil is disposed on one of the two sides, and at least a portion of the connection cable is disposed on the other of the two sides. And the coil and the connecting cable are physically separated by the spacer, so that the coil and the connecting cable are prevented from being scratched during rotation, and the coil and the connecting cable can be better protected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cooking appliances, and more particularly to an electromagnetic heating assembly for an electromagnetic heating cooking appliance and an electromagnetic heating cooking appliance employing the same. BACKGROUND

[0002] IH cooking appliances are household appliances that directly heat cookware through electromagnetic induction principle. Common ones are induction cookers and electric rice cookers. The coil for generating electromagnetic field is an important component for realizing electromagnetic heating function. The coil is usually formed by winding multiple strands of enameled wire. If the enameled wire is damaged, it may cause the coil to overheat and catch fire, which poses a serious safety hazard.

[0003] Therefore, there is a need for an electromagnetic heating assembly to at least partially solve the above problems. SUMMARY

[0004] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the detailed description section. The summary section of the present application does not mean to attempt to limit the key features and essential technical features of the claimed technical solutions, nor to determine the protection scope of the claimed technical solutions.

[0005] To at least partially solve the above problems, the present application provides an electromagnetic heating assembly for an electromagnetic heating cooking appliance, comprising:

[0006] at least two coils formed by winding enameled wire, for generating alternating magnetic field when energized, the winding center of the coils deviates from the central axis of the electromagnetic heating assembly, so that all the coils are distributed along the circumferential direction of the electromagnetic heating assembly, and all the coils are rotatable as a whole around the central axis of the electromagnetic heating assembly;

[0007] at least one connecting cable, the first end of the connecting cable is connected with the enameled wire, and the second end of the connecting cable is used for connecting to a power panel; and

[0008] a spacer having two mutually opposite sides, at least part of the coils is arranged on one side of the two sides, and at least part of the connecting cable is arranged on the other side of the two sides.

[0009] According to the present application, the electromagnetic heating assembly can realize the effect of multi-point heat source rotating heating, so that the convection direction of food materials changes and the food materials are evenly heated, thereby improving the cooking quality. The spacer physically separates the coils and the connecting cable, avoiding scratching between them when the coils rotate, so that the coils and the connecting cable can be better protected.

[0010] Optionally, all the coils are arranged on one side of the two sides, and the connecting cable extends from the one side to the other side of the two sides.

[0011] According to the present application, the spacers maximize the spacing between the coils and the connecting cable, ensuring the safe use of the electromagnetic heating assembly.

[0012] Optionally, the electromagnetic heating assembly further comprises:

[0013] a mounting frame configured to be connected to an electromagnetic heating cooking appliance; and

[0014] a coil disc distributed with the mounting frame along an axial direction of the electromagnetic heating assembly, the coil disc being rotatable relative to the mounting frame around a central axis of the electromagnetic heating assembly, and the coils being arranged on the coil disc,

[0015] wherein the mounting frame provides the spacers.

[0016] According to the present application, the electromagnetic heating assembly realizes a modular design by means of the mounting frame, which is conducive to improving the installation precision and reducing the installation difficulty, and the spacers are constructed by means of the mounting frame, so that the electromagnetic heating assembly is compact in structure.

[0017] Optionally, the mounting frame is provided with at least one wire passing hole corresponding to the connecting cable, for allowing the connecting cable to pass therethrough, so that the connecting cable extends from one side of the mounting frame facing the coil disc to the other side of the mounting frame facing away from the coil disc.

[0018] According to the present application, the connecting cable passes through the mounting frame.

[0019] Optionally, the axial direction of the coil disc is the axial direction of the electromagnetic heating assembly, the coil disc is provided with a coil disc cylindrical portion protruding towards the mounting frame along the axial direction of the coil disc, the mounting frame is provided with a mounting frame cylindrical portion protruding towards the coil disc along the axial direction of the coil disc, the mounting frame cylindrical portion is located in the coil disc cylindrical portion, the mounting frame cylindrical portion and the coil disc cylindrical portion are connected by a revolute pair structure, and an axis of the revolute pair structure is the central axis of the electromagnetic heating assembly.

[0020] According to the present application, the coil disc can stably rotate.

[0021] Optionally, the mounting frame is provided with a first groove recessed away from the coil disc along an axial direction of the coil disc, the wire passing hole is arranged on a side wall of the first groove, the mounting frame cylindrical portion is arranged on a bottom wall of the first groove, the side wall of the first groove is located at an outer periphery of the coil disc cylindrical portion, and the first end of the connecting cable is located between the coil disc cylindrical portion and the side wall of the first groove.

[0022] According to the present application, the wire passing hole and the first end of the connecting cable are arranged close to each other, thereby reducing the length of the connecting cable.

[0023] Optionally, the electromagnetic heating assembly further comprises at least one first blocking wall corresponding to the connecting cable; the first blocking wall is arranged on the other side of the spacer, and a side of the first blocking wall facing the central axis of the electromagnetic heating assembly is used to fit the connecting cable.

[0024] According to the present application, the first blocking wall limits the connecting cable, thereby protecting the connecting cable.

[0025] Optionally, the first blocking wall and the wire passing hole are oppositely arranged along a radial direction of the electromagnetic heating assembly, and the wire passing hole is located between the first blocking wall and the central axis of the electromagnetic heating assembly along the radial direction of the electromagnetic heating assembly.

[0026] According to the present application, the connecting cable can be immediately limited by the first blocking wall after passing through the wire passing hole, thereby being beneficial to protecting the connecting cable.

[0027] Optionally, the electromagnetic heating assembly further comprises at least one second blocking wall corresponding to the first blocking wall, and the second blocking wall is connected to an end of the first blocking wall away from the spacer on a side of the first blocking wall facing the central axis of the electromagnetic heating assembly.

[0028] According to the present application, the second blocking wall limits the connecting cable, thereby protecting the connecting cable.

[0029] Optionally, all the coils are formed by winding the same enameled wire, the electromagnetic heating assembly comprises two connecting cables, the first ends of the two connecting cables are electrically connected to two ends of the enameled wire respectively, and the second ends of the two connecting cables are used to be connected to the power board respectively.

[0030] According to the present application, all the coils are connected in series, thereby being beneficial to simplifying control.

[0031] Optionally, the distance between the first ends of the two connecting cables is not less than 20 mm.

[0032] According to the present application, the first ends of the two connecting cables are spaced apart to prevent electromagnetic interference and high voltage breakdown between them.

[0033] Optionally,

[0034] The cross-sectional area of the connecting cable is not less than that of the enameled wire; and / or

[0035] The surface area per unit length of the connecting cable is not less than that of the enameled wire.

[0036] According to the present application, since the connecting cable is connected in series with the enameled wire, if the cross-sectional area of the connecting cable is less than that of the enameled wire, the connecting cable becomes a resistance obstacle to the conduction of current relative to the enameled wire, and the connecting cable causes voltage division to cause the voltage of the enameled wire to drop, resulting in a decrease in IH effective heating power. According to the principle of IH heating, the actual high-frequency wave-type oscillating current flows in the enameled wire, most of which flows through the surface of the wire, and a small part flows inside the wire. Therefore, if the surface area per unit length of the connecting cable bundle is less than that of the enameled wire, the flow performance of the high-frequency current of the enameled wire will be affected. The second aspect of the present application provides an electromagnetic heating cooking appliance, which comprises:

[0037] The electromagnetic heating assembly according to any one of the first aspect; and

[0038] A cooking container comprising a ferromagnetic material for being placed coaxially with the electromagnetic heating assembly within the magnetically inducible area of the coil.

[0039] According to the present application, the electromagnetic heating cooking appliance can realize the effect of multi-point heat source rotating heating, so that the convection direction of the food changes and the heating is balanced, thereby improving the cooking quality. The spacer physically separates the coil and the connecting cable, avoiding scratching between the two when the coil rotates, and better protecting the coil and the connecting cable. BRIEF DESCRIPTION OF DRAWINGS

[0040] The following drawings of the present application are hereby incorporated into the present application as part of the present application for the purpose of understanding the present application. The drawings of the present application show representative embodiments of the present application for the purpose of explaining the principles of the present application, but are not limiting the present application.

[0041] In the drawings:

[0042] Figure 1 is a schematic side view of the electromagnetic heating cooking appliance according to the specific embodiment of the present application;

[0043] Figure 2 is an enlarged schematic view of part A in Figure 1

[0044] Figure 3 is​Figure 1 top view of the electromagnetic heating assembly and the power board in

[0045] Figure 4 is Figure 1 bottom view of the electromagnetic heating assembly and the power board in

[0046] Figure 5 is Figure 1 top view of the electromagnetic heating assembly and the power board in

[0047] Figure 6 is Figure 1 bottom view of the electromagnetic heating assembly and the power board in

[0048] Figure 7 is Figure 1 perspective exploded view of the electromagnetic heating assembly and the power board in

[0049] Figure 8 is Figure 1 further bottom view of the electromagnetic heating assembly and the power board in

[0050] Figure 9 is Figure 1 bottom view of the electromagnetic heating assembly and the power board in

[0051] Figure 10 is Figure 1 bottom view of the electromagnetic heating assembly and the power board in Figure 9 clockwise rotated by an angle relative to the position in

[0052] Figure 11 is Figure 1 bottom view of the electromagnetic heating assembly and the power board in Figure 9 counterclockwise rotated by an angle relative to the position in

[0053] BRIEF DESCRIPTION OF THE DRAWINGS

[0054] 100: cooking appliance

[0055] 200: cover

[0056] 300: cooking vessel

[0057] 400: circuit board

[0058] 401: fan

[0059] 500: base

[0060] 600: electromagnetic heating assembly

[0061] 602: blocking structure

[0062] 603: coil pan

[0063] 604: swivel substructure

[0064] 605: temperature sensor

[0065] 606: electromagnetic coil

[0066] 607: bobbin

[0067] 608: magnetic conductor

[0068] 609: first gear

[0069] 610: mounting bracket

[0070] 611: second gear

[0071] 612: magnetic shield

[0072] 613: motor

[0073] 614: first connecting cable

[0074] 615: second connecting cable

[0075] 616: screw

[0076] 617: screw

[0077] 620: wire card

[0078] 621: first first groove

[0079] 621A: first first groove front end

[0080] 621B: first first groove rear end

[0081] 622: second first groove

[0082] 622A: second first groove front end

[0083] 622B: second first groove rear end

[0084] 623: wire card

[0085] 624: wire card

[0086] 626: temperature sensor cable

[0087] 631: spring

[0088] 635: coil pan cylindrical portion

[0089] 637: enameled wire

[0090] 639: second groove

[0091] 641: first surface

[0092] 642: second surface

[0093] 643: third surface

[0094] 644: wire passage hole

[0095] 645: mounting bracket cylindrical portion

[0096] 646: first recess

[0097] 647: first recess sidewall

[0098] 648 / 649: terminal post

[0099] 650: first coil connecting section

[0100] 651: first movable section

[0101] 652: first power panel connecting section

[0102] 653: first extension section

[0103] 658: first wire passage hole

[0104] 659: second wire passage hole

[0105] 661: first connecting cable first end

[0106] 662: first connecting cable second end

[0107] 663: first connecting site

[0108] 664: second connecting site

[0109] 665: first edge

[0110] 666: first recess bottom wall

[0111] 667: circular arc wall

[0112] 668: second connecting cable first end

[0113] 669: second connecting cable second end

[0114] 671: blocking portion

[0115] 672: connecting portion

[0116] 681: first blocking wall

[0117] 682: second blocking wall

[0118] 683: third blocking wall

[0119] 700: pot body

[0120] 701: middle plate

[0121] 702: connecting column

[0122] 703: inner cylinder

[0123] 705: accommodating cavity

[0124] 707: housing

[0125] BL: bisector

[0126] DA: axial direction

[0127] DC: circumferential direction

[0128] P1: electromagnetic heating assembly center axis

[0129] P2: cooking container center axis

[0130] P3: coil disc center axis DETAILED DESCRIPTION

[0131] In the following description, numerous specific details are given to provide a thorough understanding of the application. However, it will be apparent to one of ordinary skill in the art that the application can be practiced without one or more of these details. In other instances, well-known features are not described in detail to avoid obscuring the application.

[0132] For a thorough understanding of the application, reference is made to the following description taken in conjunction with the accompanying drawings. It is apparent that the application can be practiced without one or more of the specific details set forth herein. Certain terminology is used in the description for the purpose of reference only and is not intended to be limiting.

[0133] The ordinal numbers such as "first" and "second" cited in the present application are merely identifiers and do not have any other meaning, such as a particular order, etc. Also, for example, the term "first part" itself does not imply the existence of "second part", and the term "second part" itself does not imply the existence of "first part". The use of "first", "second", and "third" words does not indicate any order, and these words can be interpreted as names.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] This application provides an electromagnetic heating component for an electromagnetic heating cooking appliance and an electromagnetic heating cooking appliance using the electromagnetic heating component.

[0138] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings.

[0139] 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 region 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.

[0140] 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.

[0141] The pot body 700 includes, for example, a housing 707, a middle plate 701, and an inner cylinder 703. The middle plate 701 is located inside the housing 707 and at the top of the pot body 700, and forms at least an upper surface of the pot body 700. The inner cylinder 703 is connected to the middle plate 701 and extends in the up-down direction. The base 500 is connected to the housing 707 and / or the middle plate 701, for example. In a broad sense, the housing 707 and the base 500 enclose a containing cavity 705, the middle plate 701 and the inner cylinder 703 divide the containing cavity 705, and the housing 707, the base 500, the middle plate 701, and the inner cylinder 703 can all provide cavity walls of the containing cavity 705. The space between the middle plate 701 and the housing 707 can be used to install components of the pot body 700, such as a fan, a circuit board, and the like. The inside of the inner cylinder 703 is used to place the cooking container 300. The inner cylinder 703 is arranged around the cooking container 300. By arranging the inner cylinder 703, the heat generated by the cooking container 300 can be reflected to the cooking container 300, the heat generated by the cooking container 300 can be prevented from leaking out, the temperature of the pot body 700 can be prevented from being too high, the heat retention effect of the cooking container 300 is improved, and the safety of the cooking appliance 100 is improved. The inner cylinder 703 can be understood as a side wall of the containing cavity 705. The base 500 provides a bottom wall of the containing cavity 705.

[0142] The electromagnetic heating assembly 600 has an electromagnetic heating assembly central axis P1, and the magnetic field strength of the alternating magnetic field generated by the electromagnetic heating assembly 600 is non-uniformly distributed along the circumferential direction of the electromagnetic heating assembly. The cooking container 300 has a cooking container central axis P2. The cooking container 300 as a whole has a shape of a solid of revolution (for example, has a circular cross section) with the cooking container central axis P2 as the axis. The cooking container 300 is arranged in a magnetically inducible region of the electromagnetic heating assembly 600, for example, is arranged in the magnetically inducible region separably from the electromagnetic heating assembly. When the cooking container 300 is placed in the containing cavity 705, the cooking container central axis P2 coincides or substantially coincides with the electromagnetic heating assembly central axis P1. Thus, the alternating magnetic field of the electromagnetic heating assembly 600 is non-uniformly distributed along the circumferential direction of the cooking container 300.

[0143] The cooking appliance 100 is configured such that at least part of the electromagnetic heating assembly 600 and the cooking container 300 can relatively rotate, so that the alternating magnetic field of the electromagnetic heating assembly 600 and the cooking container 300 relatively rotate, and thus the cooking container 300 can be uniformly heated.

[0144] For example, in the illustrated embodiment, the cooking appliance 100 is configured such that at least part of the electromagnetic heating assembly 600 can rotate relative to the cooking container 300 around the electromagnetic heating assembly central axis P1.

[0145] Specifically, as shown in FIG. 1, the electromagnetic heating assembly 600 includes a plurality of electromagnetic heating elements 610 arranged in the circumferential direction of the electromagnetic heating assembly 600. Figures 2 to 7As shown, the electromagnetic heating assembly 600 comprises, for example, a coil disc 603, at least one electromagnetic coil 606, a mounting frame 610, a transmission device and a driving device. Among them, the coil disc 603 is rotatable, specifically rotatable around a center axis P1 of the electromagnetic heating assembly, which is also the center axis P3 of the coil disc 603 for example. The coil disc 603 is, for example, disc-shaped, and the shape is adapted to the shape of the bottom of the cooking container 300. The electromagnetic coil 606 is arranged on the coil disc 603, for example, on the bottom surface of the coil disc 603, so as to be driven to rotate by the coil disc 603. The electromagnetic coil 606 can generate the alternating magnetic field described above after being powered, thereby generating electromagnetic induction with the cooking container 300, so that the cooking container 300 is heated, and in turn the food in the cooking container 300 is heated. The coil disc 603 is arranged on the mounting frame 610 and can rotate relative to the mounting frame 610 around the coil disc center axis P3. The mounting frame 610 is a component for supporting various functional components in the electromagnetic heating assembly 600, for example, a cavity wall (such as the inner cylinder 703 or the base 500) for detachably connecting to the accommodation cavity 705. The mounting frame 610 is, for example, constructed as a basin. The driving device is arranged on the mounting frame 610 and is used to provide a driving force for rotating the coil disc 603. The transmission device connects the coil disc 603 and the driving device, so that the driving device drives the coil disc 603 to rotate through the transmission device.

[0146] The axial direction of the coil disc 603 is also the axial direction DA of the electromagnetic heating assembly 600. The circumferential direction of the coil disc 603 is also the circumferential direction DC of the electromagnetic heating assembly 600. The radial direction of the coil disc 603 is also the radial direction of the electromagnetic heating assembly 600. In actual use of the cooking appliance 100, the axial direction of the coil disc 603 is the up-down direction.

[0147] The electromagnetic heating assembly 600 as a whole can be mounted to the cavity wall of the accommodation cavity 705 by means of the mounting frame 610, so that the electromagnetic heating assembly can be pre-assembled as a whole first, and then mounted in the accommodation cavity 705. For example, the mounting frame 610 is detachably connected to the inner cylinder 703. In this way, it can be avoided to install the scattered components one by one in the accommodation cavity 705, for example, to the base 500, and it is avoided to be affected by the installation precision of the installation site components, so that the installation precision between the plurality of components of the electromagnetic heating assembly 600 is higher, the assembly in the cooking appliance 100 is facilitated, the normal work and the cooking effect of the cooking appliance 100 are guaranteed, and the user experience is improved.

[0148] For example, as shown in FIG. 6, the electromagnetic heating assembly 600 is mounted in the accommodation cavity 705 through the mounting frame 610, and the coil disc 603 is arranged in the accommodation cavity 705 and is rotatable around the center axis P1 of the electromagnetic heating assembly 600. Figure 5As shown, the electromagnetic coil 606 is arranged non-concentrically with the coil disc 603. "Non-concentric" means that the spiral center of the winding of the coil 606 is not collinear with the central axis of the coil disc 603, that is, the winding center of the coil 606 deviates from the central axis P3 of the coil disc. For example, the electromagnetic heating assembly 600 only includes one electromagnetic coil 606, and the winding center of the electromagnetic coil 606 deviates from the central axis of the coil disc 603. Alternatively, the electromagnetic heating assembly 600 includes at least two electromagnetic coils 606, and all the electromagnetic coils 606 are arranged at intervals along the circumferential direction of the electromagnetic heating assembly 600. For example, the electromagnetic heating assembly 600 includes N electromagnetic coils 606, and all the electromagnetic coils 606 are arranged at equal intervals 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, and all the electromagnetic coils 606 are arranged at equal intervals (120 degrees of circumferential angle) along the circumferential direction of the electromagnetic heating assembly.

[0149] In this context, all the electromagnetic coils 606 are arranged at equal intervals along the circumferential direction of the electromagnetic heating assembly, which can be understood as meaning that the center point of each electromagnetic coil 606 is on the same circle with a point on the axis P1 as the center, and the center points of all the electromagnetic coils 606 are distributed at equal intervals on the circle, and the coil disc 603 and all the electromagnetic coils 606 form a rotationally symmetric structure with the axis P1 as the center of rotational symmetry and 360 / N degrees as the rotation angle.

[0150] The number of electromagnetic coils 606 is set according to the electromagnetic heating power requirement. The plurality of electromagnetic coils 606 can be in a series relationship, for example, wound (wound) by a single enameled wire 637, so that the plurality of coils 606 work simultaneously. Of course, each electromagnetic coil 606 can also be wound by a respective enameled wire, so as to work independently. The enameled wire 637 can be a multi-strand wire.

[0151] At the part where the coil 606 is present, the magnetic field strength is strong, and the heating effect is obvious; at the part between the two coils 606, the magnetic field strength is weak, and the heating effect is not obvious. The rotation of the coil disc 603 around the coil disc central axis P3 relative to the mounting frame 610 causes the alternating magnetic field of the coil 606 to rotate around the coil disc central axis P3 relative to the mounting frame 610. By arranging the non-concentric coil, the multi-point heat source rotating heating effect of the cooking utensil 100 can be achieved, so as to realize the variable heating convection pattern, and to realize the complex and variable convection rolling pattern and rolling effect inside the cooking container 300, so as to heat the food more evenly and improve the adverse phenomenon of partial rice being overcooked or dry after cooking.

[0152] As Figure 2As shown, the axial section of the coil disc 603 comprises a C-shaped structure, and the cooking container 300 is located at the inner side of the C-shaped structure, so that the coil disc 603 conforms to the bottom shape of the cooking container 300, reduces the distance between the alternating magnetic field and the cooking container 300, and can make the alternating magnetic field better act on the cooking container 300, thereby improving the heating efficiency. The coil 606 is arranged on the side of the coil disc 603 facing the mounting frame 610 to avoid being exposed in the containing cavity 705. The coil 606 is located at the outer side of the C-shaped structure.

[0153] Optionally, as shown in Figure 2 and Figure 7 shown, the electromagnetic heating assembly 600 further comprises a bobbin 607 arranged on the bottom surface of the coil disc 603. The bobbin 607 is arranged corresponding to the electromagnetic coil 606, and the electromagnetic coil 606 is arranged on the bobbin 607, that is, wound on the bobbin 607. The bobbin 607 is constructed as a sandwich structure, for example, a winding column is arranged at the center of the sandwich, and the enameled wire of the coil 606 is wound in a disc-shaped winding in the sandwich around the winding column. The bobbin 607 and the coil disc 603 can be connected by screws. By arranging the electromagnetic coil 606 in the wound state in the bobbin 607, it is convenient to assemble the electromagnetic coil 606 on the coil disc 603, and the electromagnetic coil 606 can also be effectively prevented from being scattered, thereby improving the stability of the electromagnetic coil 606 itself.

[0154] Optionally, as shown in Figure 2 and Figure 7 shown, the electromagnetic heating assembly 600 further comprises at least one magnetic guide 608, which is arranged on the bottom surface of the bobbin 607, for example, and is arranged corresponding to the electromagnetic coil 606, and can guide the electromagnetic field generated by the electromagnetic coil 606 when energized to converge towards the cooking container 300. The magnetic guide strip and the bobbin 607 can be fixed by clamping. In the embodiment shown, a plurality of magnetic guides 608 are arranged corresponding to each electromagnetic coil 606. The magnetic guide 608 is constructed as a long strip of magnetic guide strips, for example, and a plurality of magnetic guide strips are distributed equidistantly along the circumferential direction of the coil 606 in a radial star shape. The magnetic guide 608 can also be configured as a ring-shaped magnetic guide strip. By arranging the magnetic guide 608 corresponding to the electromagnetic coil 606, the magnetic field generated by the electromagnetic coil 606 when energized can be guided to act on the cooking container 300 of the cooking appliance 100, thereby improving the heating efficiency.

[0155] Optionally, as shown in Figure 2 and Figures 5 to 7As shown, the driving device of the electromagnetic heating assembly 600 comprises a motor 613. The motor 613 can adopt a stepping motor for providing driving force for rotating the coil disc 603. Through rotation control and transmission of the stepping motor, the coil disc 603 can realize rotation modes such as forward and reverse rotation, intermittent rotation, and stepless speed regulation. Preferably, the electromagnetic heating assembly 600 further comprises a magnetic shield 612 covering the motor 613 for shielding electromagnetic interference between the motor 613 and the electromagnetic coil 606. The magnetic shield 612 can adopt materials such as aluminum and copper having a magnetic shielding function.

[0156] Optionally, the transmission device of the electromagnetic heating assembly 600 comprises a first gear 609 and a second gear 611. The first gear 609 is coaxially connected with the coil disc 603. The second gear 611 is connected with the output shaft of the motor 613 and is in meshing transmission with the first gear 609. The first gear 609 and / or the second gear 611 can adopt a hollow shape, i.e., a weight-reducing hole is arranged, which can reduce the weight of the product. By adopting a gear pair, it is convenient to arrange in a very small space, and the driving force of the motor 613 can be transmitted to the coil disc 603 in a plurality of preset transmission ratios.

[0157] Preferably, the first gear 609 and the second gear 611 are non-metal gears. Specifically, gears made of plastic materials such as POM, GFPP, PBT, PA66, etc. can be adopted, and POM material is preferably used in the embodiment. Since the gear pair is close to the coil, by setting the gear pair as a non-metal gear, electromagnetic induction with the coil can be avoided.

[0158] Optionally, the tooth number ratio of the second gear 611 to the first gear 609 is any one of 1:1, 1:2, 1:3, and 1:4. Considering the spatial layout of the product, the tooth number ratio is preferably designed as 1:3, which is convenient for speed regulation and control of the rotation angle of the stepping motor. For example, the transmission result makes the rotation speed range of the coil disc 603 be 0.1 r / min-10 r / min. Preferably, the rotation speed value is 1 r / min.

[0159] Optionally, as shown in Figure 2 and Figure 7 As shown, the substantially central part of the coil disc 603 is provided with a coil disc cylindrical part 635 protruding towards the mounting frame 610 in the axial direction of the coil disc 603, and the mounting frame 610 is provided with a mounting frame cylindrical part 645 protruding towards the coil disc 603 in the axial direction of the coil disc 603. The cooking appliance 100 is configured such that the coil disc cylindrical part 635 and the mounting frame cylindrical part 645 are adapted and rotationally connected, so that the coil disc cylindrical part 635 is rotatable relative to the mounting frame cylindrical part 645 about the coil disc center axis P3. Thus, the coil disc 603 is rotatable relative to the mounting frame 610 about the coil disc center axis P3.

[0160] Specifically, the cooking utensil 100 is configured such that one of the mounting bracket cylindrical portion 645 and the coil disc cylindrical portion 635 is at least partially located in the other of the mounting bracket cylindrical portion 645 and the coil disc cylindrical portion 635, and the coil disc cylindrical portion 635 and the mounting bracket cylindrical portion 645 are connected through the revolute pair structure 604, wherein the axis of the revolute pair structure 604 coincides with the coil disc central axis P3. The revolute pair structure 604 is, for example, a bearing. The coil disc cylindrical portion 635 and the mounting bracket cylindrical portion 645 are, for example, cylinders, the two cylinders are nested, the axial directions of the two cylinders are both the axial direction of the coil disc 603, and the bearing is located between the two cylinders and tightly fits with the two cylinders respectively. By providing the revolute pair 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, and eccentric rotation is avoided, which affects the cooperation between mechanisms.

[0161] The revolute pair structure 604 can be configured as a rolling revolute pair structure or a sliding revolute pair structure. Optionally, the revolute pair structure 604 is made of a non-metallic material, for example, a non-metallic bearing, and can be made of a non-metallic material such as plastic or ceramic. Since the revolute pair structure 604 is close to the coil, by setting the revolute pair structure 604 as a non-metallic component, electromagnetic induction with the coil 606 can be avoided.

[0162] In the illustrated embodiment, the coil disc cylindrical portion 635 is outside and the mounting bracket cylindrical portion 645 is inside. Of course, the coil disc cylindrical portion 635 can be inside and the mounting bracket cylindrical portion 645 can be outside. The first gear 609 can be sleeved on the outer peripheral surface of the coil disc cylindrical portion 635 of the coil disc 603, and the two are connected through key transmission. Alternatively, the coil disc 603 can be integrally injection molded with the first gear 609.

[0163] Preferably, as shown in Figure 2 the outer peripheral surface of the one of the mounting bracket cylindrical portion 645 and the coil disc cylindrical portion 635 located inside is provided with a first surface 641 extending in the radial direction, and the inner peripheral surface of the other of the mounting bracket cylindrical portion 645 and the coil disc cylindrical portion 635 is provided with a second surface 642 extending in the radial direction. The first surface 641 and the second surface 642 are spaced apart in the axial direction of the coil disc 603. The revolute pair structure 604 is located between the first surface 641 and the second surface 642, so that the revolute pair structure 604 is limited in the axial direction.

[0164] Optionally, as shown in Figure 2 and Figure 7As shown, the electromagnetic heating assembly 600 further comprises a temperature sensor 605. The top of the temperature sensor 605 penetrates the coil disc 603 to be able to elastically contact the cooking vessel 300 of the cooking appliance 100. The temperature sensor 605 is arranged in the coil disc cylindrical portion 635. The temperature sensor 605 can be an NTC type temperature sensor. The electromagnetic heating assembly 600 further comprises a spring 631. The inner circumferential surface of the mounting frame cylindrical portion 645 is provided with a third surface 643 extending in the radial direction, and the spring 631 is located between the temperature sensor 605 and the third surface 643. For example, the temperature sensor 605 is arranged below the spring 631, the lower end of the spring 631 is supported on the mounting frame 610, and the upper end of the spring 631 pushes the temperature sensor 605, so that the temperature sensor 605 is able to elastically contact the cooking vessel 300 and ensure the temperature measurement effect. The third surface 643 of the mounting frame 610 is connected with a wire passing hole 644, that is, the third surface 643 and the inner circumferential surface of the wire passing hole 644 are both part of a continuous surface of the mounting frame 610, and the wire passing hole 644 is used for passing the cable 626 of the temperature sensor 605.

[0165] The coil disc cylindrical portion 635 and the mounting frame cylindrical portion 645 are both hollow, and are used to install the temperature sensor 605. The temperature sensor 605 does not rotate with the coil disc 603.

[0166] Optionally, as shown in Figure 2 and Figure 7 , the electromagnetic heating assembly 600 further comprises a blocking structure 602. The blocking structure 602 comprises a blocking portion 671 and a connecting portion 672, for example. The blocking portion 671 is configured as a blocking ring in the radial direction of the coil disc 603. The connecting portion 672 extends substantially perpendicular to the blocking portion 671. One end of the connecting portion 672 is connected with the blocking portion 671, and the other end is used to connect the mounting frame 610, for example, the mounting frame cylindrical portion 645. The connecting portion 672 extends in the axial direction of the coil disc 603, for example, is configured as a sleeve (also referred to as a blocking structure cylindrical portion), and is located in the coil disc cylindrical portion 635 and connected to the mounting frame 610 (for example, clamped or screwed). The blocking structure 602 is fixedly connected with the mounting frame 610, so as not to rotate with the coil disc 603.

[0167] One end of the connecting portion 672 is connected to the middle part of the radial width of the blocking ring of the blocking portion 671 (not necessarily the midpoint position of the width of the blocking ring). The outer diameter of the blocking ring of the blocking portion 671 is greater 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 part 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 in the radial direction of the coil disc 603, so as to block the coil disc 603 from moving in the axial direction of the coil disc 603 away from the mounting frame 610. The part 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.

[0168] The cooking appliance 100 further comprises a circuit board 400. The circuit board 400 is mounted in the form of a P board on the base 500 or the mounting frame 610, for example. As shown in the drawings, the circuit board 400 is mounted on the base 500 or the mounting frame 610. Figure 8 The control device, which is configured as an MCU chip, for example, is mounted on the circuit board 400. The control device is used to control the operation of all electrically controlled components of the cooking appliance 100. Preferably, the circuit board 400 is arranged on the mounting frame 610 and is electrically connected to the electromagnet coil 606, the motor 613 and the temperature sensor 605 through cables, respectively. The circuit board 400 can be a power board, that is, used to directly connect to the mains. The power board is provided with a fan 401 for dissipating heat from the power board.

[0169] Preferably, the mounting frame 610 is provided with an opening for the cables of the electric components of the electromagnetic heating assembly 600 or the connecting cables thereof to pass through, so that these cables are connected to the circuit board 400 on the side of the mounting frame 610 facing away from the coil disc 603, facilitating assembly operation. In the present application, each cable of the electric components of the electromagnetic heating assembly 600 and its connecting cable is referred to as a functional assembly wire. Further, the side of the mounting frame 610 facing away from the coil disc 603 is provided with a wire slot for accommodating these functional assembly wires. The side of the mounting frame 610 facing away from the coil disc can also be provided with a wire clamp for limiting these functional assembly wires.

[0170] As shown in the drawings, Figures 6 to 8As shown, the main functional components of the electromagnetic heating assembly 600 are wired including a first connecting cable 614 and a second connecting cable 615. The first connecting cable 614 is connected at two ends to a 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 two ends to a second end of the enameled wire 637 forming the electromagnetic coil 606 and the circuit board 400, respectively. Since the first connecting cable 614 and the second connecting cable 615 need to rotate with the coil disc 603, both the first connecting cable 614 and the second connecting cable 615 are provided with a U-shaped bend, having a deformation allowance, so as not to be wound when the coil disc 603 rotates.

[0171] The electromagnetic heating assembly 600 is configured 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 assembly 600, wherein the magnetic field strength of the strong magnetic region is greater than that of the weak magnetic region. Preferably, the N strong magnetic regions are equally spaced along the circumferential direction of the electromagnetic heating assembly 600, and the N weak magnetic regions are equally spaced along the circumferential direction of the electromagnetic heating assembly 600. Considering the limited length of the connecting cable of the enameled wire of the coil 606, the angle range of the rotation of the coil disc 603 is, for example, 360 / N degrees (±180 / N degrees), so that the heating sites are not 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 less than 360 degrees, without rotating a full circle. For example, in the illustrated embodiment, N = 3, and the angle range of the rotation of the coil disc 603 is 120 degrees. In other words, the coil disc 603 rotates 60 degrees to each side from the neutral position (as shown). Figure 9 As shown). Figure 10 and Figure 11 As shown).

[0172] The wiring mode of the first connecting cable 614 and the second connecting cable 615 is similar. The following will be specifically described taking the first connecting cable 614 as an example.

[0173] As described before, as shown). 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 disc 603 is provided with a terminal post 648 at a position close to the coil disc cylindrical part 635, and the first end 661 of the connecting cable 614 and the end of the enameled wire 637 are electrically connected at the terminal post 648, for example, the first end 661 of the connecting cable 614 is fixed to the terminal post 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 by a fastener (e.g., a screw 616), for example. Thus, the first end 661 of the connecting cable moves with the coil disc 603 and the coil 606, and the second end 662 of the connecting cable is fixed. This makes at least part of the connecting cable 614 in a moving state when the coil disc 603 rotates. Preferably, the first connecting cable 614 and the second connecting cable 615 are configured as high-flexibility drag chain cables. Drag chain cables are suitable for motion working conditions and can withstand entanglement, wear, pull-out, and scratching during motion, keeping the cables from being scattered.

[0174] At least part of the connecting cable 614 is arranged to be bent in a U shape to reserve a length allowance. Specifically, the connecting cable 614 includes a first connecting site 663 and a second connecting site 664, the first connecting site 663 rotates synchronously with the coil 606 around the central axis P1 of the electromagnetic heating assembly, and the second connecting site 664 does not rotate with the coil 606 around the central axis P1 of the electromagnetic heating assembly, so that the part of the connecting cable 614 between the first connecting site 663 and the second connecting site 664 is bent in a U shape. Cable fixing structures are provided at both the first connecting site 663 and the second connecting site 664. For example, the cable fixing structure at the first connecting site 663 is the terminal post 648, and the cable fixing structure at the second connecting site 664 is the wire clamp 620.

[0175] In order to make the first connecting cable 614 always maintain a U-shaped bend, the coil disc 603 is provided with a coil disc rotating part 650 and a coil disc fixed part 651. The coil disc rotating part 650 is rotatable around the central axis P1 of the electromagnetic heating assembly, and the coil disc fixed part 651 is fixed relative to the central axis P1 of the electromagnetic heating assembly. The coil 606 is arranged on the coil disc rotating part 650, and the coil disc fixed part 651 is provided with a coil disc rotating part fixing structure 652. The coil disc rotating part fixing structure 652 is configured to fix the coil disc rotating part 650 relative to the central axis P1 of the electromagnetic heating assembly. For example, the coil disc rotating part fixing structure 652 is a screw hole 652, and the coil disc rotating part 650 is fixed to the screw hole 652 by a fastener (e.g., a screw 653). Figure 6 and Figure 8As shown, the electromagnetic heating assembly 600 further comprises a first blocking wall 681 and a third blocking wall 683. The first blocking wall 681 is arranged corresponding to the connecting cable 614. The third blocking wall 683 is arranged corresponding to the first blocking wall 681, and thus corresponding to the connecting cable 614. The third blocking wall 683 is arranged opposite to the first blocking wall 681 in the radial direction of the electromagnetic heating assembly 600. The first connecting site 663 and the second connecting site 664 are located between the first blocking wall 681 and its extension and the third blocking wall 683 and its extension, so that the part of the connecting cable 614 between the first connecting site 663 and the second connecting site 664 is respectively abutted against the first blocking wall 681 and the third blocking wall 683 to bend in a U shape. That is, for example, the connecting cable 614 extends against the third blocking wall 683 first, then the connecting cable 614 bends in a U shape, and then extends against the first blocking wall 681.

[0176] Since the third blocking wall 683 is arranged opposite to the first blocking wall 681, each of them exerts a force on the connecting cable 614 towards the other, so that the connecting cable 614 can abut against the two blocking walls by its own bending resistance. In other words, the first blocking wall 681 and the third blocking wall 683 sandwich the U-shaped part of the connecting cable 614 and at the same time force it 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, so that the connecting cable 614 cannot be deformed at will, reducing the risk of damage. Preferably, the third blocking wall 683 and the first blocking wall 681 are arranged as coaxial circular arc walls.

[0177] Preferably, the first connecting site 663 is connected to the coil disc 603, for example, to the side of the coil disc 603 facing the mounting frame 610, so that the first connecting site 663 can rotate with the coil disc 603. For example, the first connecting site 663 is the first end 661 of the first connecting cable. Preferably, the third blocking wall 683 is also arranged on the coil disc 603, for example, on the side of the coil disc 603 facing the mounting frame 610. Preferably, the coil disc cylindrical part 635 provides the third blocking wall 683. Thus, the structure of the electromagnetic heating assembly 600 is compact.

[0178] Preferably, the second connecting site 664 is connected to the mounting frame 610, so that the second connecting site 664 remains stationary. In order to facilitate the connection of the second end 662 of the connecting cable 614 to the circuit board 400, the second end 662 of the connecting cable 614 is connected to the circuit board 400 on the side of the mounting frame 610 facing away from the coil disc 603. Therefore, preferably, the second connecting site 664 is connected to the side of the mounting frame 610 facing away from the coil disc 603. For example, as shown in FIG. 6, the second end 662 of the connecting cable 614 is connected to the circuit board 400 on the side of the mounting frame 610 facing away from the coil disc 603. Figure 8As shown, the connecting cable 614 is fixed on the surface of the mounting frame 610 at the second connecting position 664 by a fastener (for example, a wire clamp 620). Preferably, a first blocking wall 681 is also arranged on the side of the mounting frame 610 facing away from the coil disc 603. The second connecting position 664 is located between the portion of the connecting cable 614 contacting 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.

[0179] In order to enable the connecting cable 614 to pass through the mounting frame 610, the mounting frame 610 is provided with a first wire passing hole 658 corresponding to the first connecting cable 614, for enabling the first connecting cable 614 to pass through. Thus, the connecting cable 614 extends along the third blocking wall 683 of the coil disc cylindrical portion 635, then extends out of the first wire passing hole 658 to the side of the mounting frame 610 facing away from the coil disc 603, and after extending out of the first wire passing hole 658, is bent into a U shape and then extends along the first blocking wall 681.

[0180] The first gear 609 is clamped on the outer periphery of the coil disc cylindrical portion 635, below the disc body of the coil disc 603. The terminal post 648 is arranged in the hollow structure of the first gear 609 and extends downward from the lower surface of the disc body of the coil disc 603. The enameled wire 637 can pass downward through the first gear 609 from the hollow structure of the first gear 609, so as to be connected with the connecting cable 614. Alternatively, the connecting cable 614 can pass upward through the first gear 609 to be connected with the enameled wire 637.

[0181] Preferably, the first blocking wall 681 and the first wire passing hole 658 are arranged opposite to each other in 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 in the radial direction of the electromagnetic heating assembly 600. Thus, after being bent, the connecting cable 614 can quickly contact the first blocking wall 681, which is beneficial to the wiring plasticity of the connecting cable 614. The third blocking wall 683, the first wire passing hole 658 and the first blocking wall 681 are arranged in sequence from inside to outside in 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 toward the central axis P1.

[0182] As shown in FIG. 6, the connecting cable 614 is connected with the enameled wire 637 through the first gear 609. The connecting cable 614 is connected with the enameled wire 637 through the first gear 609. 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] It can be understood that the terminal post 648 and the first end 661 of the first connecting cable 614 are both located between the coil disc cylindrical portion 635 and the side wall 647 of the first groove 646.

[0190] Preferably, the first movable section 651 is substantially bent into a semicircle. Preferably, the first blocking wall 681 is configured as an arc wall with the central axis P1 of the electromagnetic heating assembly 600 as the axis. In this way, during the rotation of the coil disc 603, the first power board connecting section 652 and the first blocking wall 681 are in rolling friction, without sliding friction, and the wear is small. If the first movable section 651 is bent too much, the length of the connecting cable 614 will increase, and the cost will increase. In addition, the connecting cable 614 cannot be closely attached to the first blocking wall 681 by using the bending resistance of the cable itself. Moreover, the size of the mounting frame 610 also limits the radial span of the first movable section 651. If the first movable section 651 is bent too small, the risk of damage to the cable surface will increase. In addition, the bending deformation is large, the bending resistance is stronger, the flexible deformation ability of the cable is reduced, the rotation resistance of the coil disc 603 is increased, and there is a risk of blocking and jamming. The radius R1 of the inner arc surface of the first blocking wall 681 (i.e., the surface in contact with the connecting cable 614) is, for example, 60-150 mm.

[0191] Preferably, as shown in Figure 9 , 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 20-90 mm, for example, 40-60 mm. The radius r of the semicircle of the first movable section 651 is substantially a / 2.

[0192] The rotation range of the coil disc 603 is 360 / N degrees. Preferably, the angular distance between the two ends of the first blocking wall 681 in 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 be in contact with the first blocking wall 681.

[0193] As shown in Figure 8 , the electromagnetic heating assembly 600 further comprises a second blocking wall 682. The second blocking wall 682 is arranged corresponding to the first blocking wall 681, i.e., 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 frame 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 frame 610, the first blocking wall 681 and the second blocking wall 682 form a first substantially circular-arc-shaped groove 621 (see Figure 4 ) for accommodating the first power board connecting section 652. The second blocking wall 682 limits the axial position of the connecting cable 614.

[0194] 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.

[0195] 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 during movement as the first connecting cable 614, which will not be elaborated further here. Preferably, the radii of the two first grooves 621 and 622 are the same. Preferably, the second groove of the second connecting cable 615 is connected to the second groove of the first connecting cable 614, or in other words, they are different parts of the same groove.

[0196] 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.

[0197] Of course, the spacer can also be another component independent of the mounting frame 610. The coil 606 can be located entirely on one side of the spacer, or partially on one side of the spacer and partially on the other side of the spacer. Each of the connection cables 614 and 615 can be located entirely on one side of the spacer, or partially on one side of the spacer and partially on the other side of the spacer.

[0198] Preferably, the distance between the first end 661 of the first connection cable 614 and the first end 668 of the second connection cable 615 is not less than 20 mm, so as to prevent electromagnetic interference and high voltage penetration therebetween.

[0199] Preferably, the first first groove 621 and the second first groove 622 are at least partially distributed in axial symmetry, and the symmetry axis of the two first grooves intersects the central axis P1 of the electromagnetic heating assembly 600. The binding posts 649 and 648 are also symmetrically arranged about the same symmetry axis. The cylindrical shape of the coil drum 635 ensures the symmetry of the third blocking walls of the two connection cables. Thus, as shown in the neutral position of the coil disc 603, the U-shape of the first connection cable 614 and the U-shape of the second connection cable 615 are substantially symmetrical, and the two connection cables are deformed in the same form, simplifying the wiring design. Figure 9

[0200] As shown in the neutral position of the coil disc 603, the U-shape of the first connection cable 614 and the U-shape of the second connection cable 615 are substantially symmetrical, and the two connection cables are deformed in the same form, simplifying the wiring design. Figure 9 As shown in the neutral position of the coil disc 603, the U-shape of the first connection cable 614 and the U-shape of the second connection cable 615 are substantially symmetrical, and the two connection cables are deformed in the same form, simplifying the wiring design. Figure 8 As shown in the neutral position of the coil disc 603, the U-shape of the first connection cable 614 and the U-shape of the second connection cable 615 are substantially symmetrical, and the two connection cables are deformed in the same form, simplifying the wiring design.

[0201] The motor 613 is mounted at the other one of the two ends of the electromagnetic heating assembly 600 spaced apart in the second direction (e.g., the front-rear direction) (e.g., the front side). The motor 613 is located between the 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.

[0202] ​The fan 401 is located substantially behind the electromagnetic heating assembly 600. The two connecting cables 614 and 615 are connected to the power board 400 at the same side (e.g. left side) of the fan 401 along the first direction, which makes the two connecting cables 614 and 615 not equal in length. For example, the second connecting cable 615 is longer than the first connecting cable 614. In order to better limit the longer second connecting cable 615, the second first groove 622 for accommodating the longer connecting cable 615 is longer than the first first groove 621 for accommodating the shorter connecting cable 614. The two first limiting structures are not equal in length, and at least part of the two first limiting structures 621 and 622 are symmetrically arranged about the bisector BL. The shorter first first groove 621 is symmetrically arranged with part of the longer second first groove 622 about the bisector BL.

[0203] Specifically, the shorter first first groove 621 is symmetrically arranged with the front side part of the longer second first groove 622 about the bisector BL. For example, one end 621A of the first first groove 621 opposite to the front side of the electromagnetic heating assembly 600 (closer to the motor 613) is symmetrically arranged with one end 622A of the second first groove 622 opposite to the front side of the electromagnetic heating assembly 600 about the bisector BL. The two first grooves 621 and 622 extend in the same circle with the central axis P1 as the axis. The extension length of the second first groove 622 is greater than that of the first first groove 621, so that one end 621B of the first first groove 621 opposite to the rear side of the electromagnetic heating assembly 600 is asymmetrically arranged with one end 622B of the second first groove 622 opposite to the rear side of the electromagnetic heating assembly 600 about the bisector BL. The part of the first first groove 621 and the second first groove 622 close to the motor 613 is symmetrically arranged about the bisector BL.

[0204] Preferably, the cross-sectional area of the connecting cables 614 and 615 is not less than that 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 less than that of the enameled wire 637, the connecting cables become a resistance to the conduction of current relative to the enameled wire 637, and the connecting cables cause voltage division to cause the voltage of the enameled wire 637 to drop, resulting in a decrease in IH effective heating power. Here, the cross-sectional area of the cable refers to the overall cross-sectional area. When the cable is a plurality of wires connected in parallel, the cross-sectional area is the sum of the cross-sectional area of each wire.

[0205] Preferably, the surface area per unit length of the connecting cables 614 and 615 is not less than the surface area per unit length of the enameled wire 637. According to the IH heating principle, the actual high-frequency wave type oscillation current in the enameled wire 637 flows, most of which flows through the surface of the wire, and a small part of which flows inside the wire. Therefore, if the surface area per unit length of the connecting cable bundle is less than the surface area per unit length of the enameled wire 637, the flow performance of the high-frequency current of the enameled wire 637 will be affected.

[0206] The relative rotation between the cooking container 300 and the magnetic field can occur while the first coil 606 is powered, that is, the magnetic field of the electromagnetic heating assembly 600 rotates while heating the cooking container 300, so that the cooking container 300 is uniformly heated, and the horizontal temperature difference in the same horizontal plane between different parts inside the cooking container 300 is reduced. Alternatively, the relative rotation between the cooking container 300 and the magnetic field can occur alternately with the power-on of the first coil 606, that is, the rotation is not heated and the heating is not rotated, so as to reduce the vertical temperature difference in the same vertical plane at each circumferential position. Uniform heating is achieved by operating one cycle. Alternatively, the timing of heating and the timing of rotation are controlled separately. In this application, whether the rotation and the heating occur simultaneously or not, the heating position is changed by the rotation, so as to achieve uniform heating.

[0207] The cooking process of the rice cooking of the cooking appliance 100, for example, includes a water absorption process, a boiling process, a boiling maintenance process, a rice stewing process, and a temperature maintaining process in sequence. In the water absorption process, the food material is soaked in warm water to fully absorb water to improve the taste. In the boiling process, the food material is heated to a temperature close to boiling by using a large fire, and then the boiling is maintained in the boiling maintenance process to cook the food material substantially. In the rice stewing process, the residual free water is dried to further cook the food material. Finally, in the temperature maintaining process, the user can eat hot food.

[0208] In each process, the electromagnetic heating assembly 600 (specifically, the electromagnetic coil 606) as the heating device works in a power-regulated manner. In each power-regulated period, the electromagnetic coil 606 is powered for a preset power-on duration and is powered off for a preset power-off duration, and the sum of the preset power-on duration and the preset power-off duration is the duration of a power-regulated period. Due to different cooking purposes or effects to be achieved, the average power of each process can be different, for example, the preset power-on duration of different processes is different. Also, due to the requirement of the cooking cavity in each process for a suitable temperature, the power of the electromagnetic heating assembly 600 in each process can not be constant (the preset power-on duration of the electromagnetic heating assembly 600 in the same process in different power-regulated periods is different), and can not be in a working state all the time (in this document, the electromagnetic heating assembly 600 in the power-regulated period is considered to be in a working state).

[0209] The processes, steps, and procedures described in all of the preferred embodiments above are merely examples. Unless an adverse effect occurs, various processing operations can be performed in a different order from the above-described processes. The order of the steps of the above-described processes can also be added, combined, or deleted as necessary.

[0210] In understanding the scope of the present application, the term "comprising" and its derivatives, as used herein, are intended to be open-ended terms that specify the presence of the stated features, elements, components, groups, integers, and / or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and / or steps. The foregoing also applies to like-terms, for example, "comprising," "having," "including," and their derivatives, as well as the term "consisting" and its derivatives.

[0211] As used herein, the term "attached" or "attach" includes a configuration in which an element is directly secured to another element by affixing the element to the other element; a configuration in which the element is indirectly secured to the other element by affixing the element to an intermediate member that, in turn, is affixed to the other element; and a configuration in which one element is integral with the other element, i.e., the element is essentially a portion of the other element. The definition also applies to words of similar import, for example, "connected," "coupled," "engage," "mount," "bond," "secure," and derivatives thereof. Finally, as used herein, degree terms such as "substantially," "approximately," and "about" mean an amount that is reasonable given the nature of the attribute being conveyed when modified. For example, "substantially" can mean within 10% of the stated value.

[0212] Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The features described in one embodiment can be applied to another embodiment, mutatis mutandis, unless the features are not applicable or are otherwise stated.

[0213] The present application has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the present application to the described embodiments. Furthermore, those skilled in the art can understand that the present application is not limited to the above embodiments, and that various modifications and changes can be made to the present application according to the teachings of the present application, and that such modifications and changes fall within the scope of the present application claimed.

Claims

1. An electromagnetic heating assembly for an electromagnetic heating cooking appliance, characterized in that, The electromagnetic heating assembly comprises: at least two coils formed by winding enameled wire, for generating an alternating magnetic field when energized, the winding centers of the coils being offset from the central axis of the electromagnetic heating assembly, so that all the coils are distributed along the circumferential direction of the electromagnetic heating assembly, and all the coils are integrally rotatable around the central axis of the electromagnetic heating assembly; at least one connecting cable, a first end of the connecting cable being connected to the enameled wire, and a second end of the connecting cable being used for connecting to a power board; and a spacer having two mutually opposite sides, at least part of the coils being arranged on one side of the two sides, and at least part of the connecting cable being arranged on the other side of the two sides. All the coils are arranged on one side of the two sides, and the connecting cable extends from the one side to the other side of the two sides.

2. The electromagnetic heating assembly of claim 1, wherein, The electromagnetic heating assembly further comprises:

3. The electromagnetic heating assembly of claim 2, wherein, a mounting frame used for connecting to an electromagnetic heating cooking appliance; and a coil disc distributed along the axial direction of the electromagnetic heating assembly with the mounting frame, the coil disc being rotatable relative to the mounting frame around the central axis of the electromagnetic heating assembly, and the coils being arranged on the coil disc, wherein the mounting frame provides the spacer. The mounting frame is provided with at least one wire passing hole corresponding to the connecting cable, for allowing the connecting cable to pass through, so that the connecting cable extends from one side of the mounting frame facing the coil disc to the other side of the mounting frame facing away from the coil disc.

4. The electromagnetic heating assembly of claim 3, wherein, The axial direction of the coil disc is the axial direction of the electromagnetic heating assembly, the coil disc is provided with a coil disc cylindrical portion protruding toward the mounting frame along the axial direction of the coil disc, the mounting frame is provided with a mounting frame cylindrical portion protruding toward the coil disc along the axial direction of the coil disc, the mounting frame cylindrical portion is located in the coil disc cylindrical portion, and the mounting frame cylindrical portion is connected to the coil disc cylindrical portion through a revolute pair structure, the axis of the revolute pair structure being the central axis of the electromagnetic heating assembly.

5. The electromagnetic heating assembly of claim 4, wherein, The mounting frame is provided with a first recess recessed away from the coil disc along the axial direction of the coil disc, the wire passing hole is arranged on the side wall of the first recess, the mounting frame cylindrical portion is arranged on the bottom wall of the first recess, the side wall of the first recess is located on the outer periphery of the coil disc cylindrical portion, and the first end of the connecting cable is located between the coil disc cylindrical portion and the side wall of the first recess.

6. The electromagnetic heating assembly of claim 5, wherein, The electromagnetic heating assembly further comprises at least one first blocking wall corresponding to the connecting cable; the first blocking wall is arranged on the other side of the spacer, and one side of the first blocking wall facing the central axis of the electromagnetic heating assembly is used for contacting the connecting cable.

7. The electromagnetic heating assembly of claim 6, wherein, The first blocking wall and the wire passing hole are oppositely arranged along the radial direction of the electromagnetic heating assembly, and the wire passing hole is located between the first blocking wall and the central axis of the electromagnetic heating assembly along the radial direction of the electromagnetic heating assembly.

8. The electromagnetic heating assembly of claim 7, wherein, ​ 9. The electromagnetic heating assembly of claim 7, wherein, The electromagnetic heating assembly further comprises at least one second blocking wall, which is correspondingly arranged with the first blocking wall, and which is connected to the first blocking wall on a side of the first blocking wall facing the central axis of the electromagnetic heating assembly and away from the end of the first blocking wall distal to the spacer.

10. The electromagnetic heating assembly of claim 1, wherein, All the coils are formed by winding the same coil of enameled wire, and the electromagnetic heating assembly comprises two connection cables, first ends of the two connection cables are respectively electrically connected to two ends of the coil of enameled wire, and second ends of the two connection cables are respectively connected to the power board.

11. The electromagnetic heating assembly of claim 10, wherein, The distance between the first ends of the two connection cables is not less than 20 mm.

12. The electromagnetic heating assembly of claim 1, wherein, The electromagnetic heating assembly comprises N coils, all the coils are equally spaced along the circumferential direction of the electromagnetic heating assembly around the central axis of the electromagnetic heating assembly, and 2≤N≤6.

13. The electromagnetic heating assembly according to any one of claims 1 to 12, characterized in that, a cross-sectional area of the connection cable is not less than a cross-sectional area of the coil of enameled wire; and / or a surface area per unit length of the connection cable is not less than a surface area per unit length of the coil of enameled wire.

14. An electromagnetic heating cooking appliance, characterized by, comprising: the electromagnetic heating assembly according to any one of claims 1 to 13; and a cooking vessel comprising a ferromagnetic material for being coaxially placed within a magnetically inducible area of the coils of the electromagnetic heating assembly.

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