Electromagnetic heating module and electromagnetic heating cooking utensil

Abstract

The utility model discloses an electromagnetic heating module and an electromagnetic heating cooking utensil. The electromagnetic heating module comprises at least one first coil and at least one second coil. The first coil is used for generating a first alternating magnetic field after being electrified, and the winding center of the first coil deviates from the central axis of the electromagnetic heating module. The second coil is used for generating a second alternating magnetic field after being electrified, and the winding center of the second coil is located on the central axis of the electromagnetic heating module. According to the electromagnetic heating module, the first coil can provide a magnetic field which is non-uniformly distributed in the circumferential direction of the electromagnetic heating module, and the second coil can provide a magnetic field which is uniformly distributed in the circumferential direction of the electromagnetic heating module. When the magnetic field and the cooking container rotate relatively, the magnetic field of the first coil forms a multi-point heat source rotating heating effect, and the magnetic field of the second coil forms a fixed heat source heating effect. Therefore, heat sources of the two coils can be complementary, food materials can be fully turned over, and the cooking quality can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cooking appliances, in particular to an electromagnetic heating module and an electromagnetic heating cooking appliance adopting the same. BACKGROUND

[0002] IH cooking appliances are household appliances that directly heat cookware through electromagnetic induction principle. Common IH cooking appliances include induction cooktops and electric rice cookers. In the prior art, in order to achieve the three-dimensional heating effect of food materials during cooking and achieve the effect of complex and strong convection heating, multiple independently controlled coils are arranged on the coil disc. The independently controlled heating of different parts of the coil enables the hot and cold regions generated in the pot to be variable, i.e., different cold and hot regions can form different convection directions at different cooking time periods, thereby generating more than one heat convection rolling state, so as to achieve the effect of complex and strong convection heating inside the inner pot. Due to the arrangement of multiple independently heated coils, the coil arrangement is difficult, the winding method is complex, the winding process is required to be high, and the structure process of the magnetic strip and the magnetic strip frame is complex, the assembly is difficult, and the overall cost is high. Moreover, the coil heating position is fixed, the heating area is limited, and the cooking effect is not ideal.

[0003] Therefore, it is necessary to provide an electromagnetic heating cooking appliance 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 necessary 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 first aspect of the present application provides an electromagnetic heating module for heating a cooking container of an electromagnetic heating cooking appliance, the electromagnetic heating module comprising:

[0006] at least one first coil for generating a first alternating magnetic field after being powered on, the winding center of the first coil being offset from the central axis of the electromagnetic heating module; and

[0007] a second coil for generating a second alternating magnetic field after being powered on, the winding center of the second coil being located on the central axis of the electromagnetic heating module.

[0008] According to the present application, the first coil can provide a magnetic field which is non-uniformly distributed along the circumferential direction of the electromagnetic heating module, and the second coil can provide a magnetic field which is uniformly distributed along the circumferential direction of the electromagnetic heating module. When the magnetic field rotates relative to the cooking container, the magnetic field of the first coil forms the effect of multi-point heat source rotating heating, and the magnetic field of the second coil forms the effect of fixed heat source heating. Thus, the heat sources of the two coils can be complementary, so that the convection of the food material has both fixed direction convection and changing direction convection, and the food material is fully rolled, which is beneficial to improve the cooking quality.

[0009] Optionally, at least part of the second coil is located between the first coil and the central axis of the electromagnetic heating module.

[0010] According to the present application, the heat source of the second coil can make up for the insufficient heat of the heat source of the first coil.

[0011] Optionally, the second coil is entirely located between the first coil and the central axis of the electromagnetic heating module.

[0012] According to the present application, the heat source of the second coil is entirely used to make up for the insufficient heat of the heat source of the first coil, thereby saving the length of the enameled wire of the second coil and facilitating the arrangement of the coil.

[0013] Optionally, the first coil is wound by enameled wire in a first direction, the second coil is wound by enameled wire in a second direction, and the first direction is opposite to the second direction; and / or

[0014] The ratio of the length of the part of the enameled wire of the second coil for forming inductance to the length of the part of the enameled wire of a single first coil for forming inductance is 1:1-1:4.

[0015] According to the present application, the two coils are wound in opposite directions, so that the coils are in the same direction when close to each other, and the magnetic fields caused by the opposite currents are avoided from canceling each other. The effective lengths of the two coils correspond to the heating powers of the two coils, and the power of the second coil as a compensation heat source can be smaller than that of the first coil.

[0016] Optionally, the first coil and the second coil are wound by the same enameled wire; or

[0017] The first coil and the second coil are wound by different enameled wires.

[0018] According to the present application, the first coil and the second coil can work simultaneously or independently.

[0019] Optionally, the electromagnetic heating module comprises a plurality of first coils, and all the first coils are equally spaced along the circumferential direction of the electromagnetic heating module.

[0020] According to this application, the magnetic field of the first coil includes equally spaced strong magnetic regions and equally spaced weak magnetic regions, which facilitates control.

[0021] Optionally, the electromagnetic heating module further includes a coil disk, the central axis of which is the central axis of the electromagnetic heating module, and the first coil and the second coil are disposed on the coil disk.

[0022] According to this application, the first coil and the second coil are disposed in the same component, and the electromagnetic heating module has a compact structure.

[0023] Optionally, the first coil and the second coil are disposed on the same side of the coil disk; and / or

[0024] The coil disk is provided with a positioning groove, and the first coil is disposed in the positioning groove.

[0025] According to this application, the first coil and the second coil are arranged on the same side of the coil disk, which facilitates wiring. The positioning slot ensures the stability of the first coil's position.

[0026] Optionally, a cylindrical portion extending along the axial direction of the coil disk is provided at approximately the center of the coil disk, and the second coil is disposed on the outer periphery of the cylindrical portion of the coil disk.

[0027] The electromagnetic heating module also includes a temperature sensor, which is disposed approximately coaxially with the coil disk within the cylindrical portion of the coil disk.

[0028] The electromagnetic heating module is configured such that the coil and the temperature sensor can rotate relative to each other around a coaxial axis.

[0029] According to this application, the electromagnetic heating module can monitor the heating temperature through a temperature sensor. The temperature sensor and the coil can rotate relative to each other, so that the cooking container and the coil can rotate relative to each other. Thus, the magnetic field of the first coil can achieve the effect of multi-point heat source rotation heating.

[0030] Optionally, the electromagnetic heating module further includes a mounting bracket for detachable connection to the electromagnetic heating cooking appliance. The mounting bracket has a cylindrical portion protruding toward the coil disc along the axial direction of the coil disc. The cylindrical portion of the coil disc protrudes toward the mounting bracket along the axial direction of the coil disc. The cylindrical portion of the coil disc is adapted to and rotatably connected to the cylindrical portion of the mounting bracket, such that the cylindrical portion of the coil disc is rotatable relative to the cylindrical portion of the mounting bracket about the central axis of the coil disc.

[0031] According to this application, the mounting bracket and the coil are connected by a matching sleeve to achieve relative rotation, thus achieving the effect of "the pot does not rotate, but the magnetic field rotates." The electromagnetic heating module as a whole can be installed onto the cooking appliance with the help of the mounting bracket, thereby pre-assembling the electromagnetic heating module into a whole, improving installation accuracy, and facilitating assembly in the cooking appliance.

[0032] Optionally, at least one of the mounting frame cylindrical portion and the coil disc cylindrical portion is located in the other of the mounting frame cylindrical portion and the coil disc cylindrical portion, and the coil disc cylindrical portion and the mounting frame cylindrical portion are connected by a rotary joint structure, wherein the axis of the rotary joint structure coincides with the central axis of the coil disc.

[0033] According to this application, the rotary joint structure enables the coil disk to rotate stably.

[0034] Optionally, the slewing joint structure is configured as a rolling slewing joint structure or a sliding slewing joint structure; and / or

[0035] The rotary joint structure is made of non-metallic materials.

[0036] According to this application, the slewing pair structure can be flexibly configured and electromagnetic interference with the coil can be avoided.

[0037] Optionally, the outer peripheral surface of one of the mounting frame cylindrical portion and the coil disc cylindrical portion is provided with a first surface extending radially, and the inner peripheral surface of the other of the mounting frame cylindrical portion and the coil disc cylindrical portion is provided with a second surface extending radially, and the rotary joint structure is located between the first surface and the second surface.

[0038] According to this application, the first and second surfaces position the rotary joint structure axially.

[0039] Optionally, the inner circumferential surface of the cylindrical portion of the mounting bracket is provided with a third surface extending in the radial direction.

[0040] The electromagnetic heating module also includes a spring, which is located between the temperature sensor and the third surface.

[0041] The third surface is connected to a through hole for the cable of the temperature sensor to pass through.

[0042] According to this application, the spring ensures that the temperature sensor is in close contact with the cooking container.

[0043] Optionally, the electromagnetic heating module further includes a blocking structure, the blocking structure comprising:

[0044] a blocking part configured as a blocking ring in a radial direction of the coil disc, an outer diameter of the blocking ring being greater than an inner diameter of the coil disc cylindrical part, and an inner diameter of the blocking ring being less than a maximum outer diameter of the temperature sensor; and

[0045] a connecting part, one end of the connecting part being connected to a middle part of the blocking ring in a radial direction, the connecting part extending into the coil disc cylindrical part in an axial direction of the coil disc, and the other end of the connecting part being connected to the mounting frame.

[0046] According to the present application, the blocking structure can block the coil disc from moving away from the mounting frame in the axial direction, and can also prevent the temperature sensor from being pulled out of the coil disc cylindrical part.

[0047] Optionally, the mounting frame cylindrical part is located in the coil disc cylindrical part, and the connecting part is configured as a cylinder and is connected to the mounting frame cylindrical part in a screwing or clamping manner.

[0048] According to the present application, the electromagnetic heating module has a compact structure.

[0049] Optionally, the electromagnetic heating module further comprises a retaining ring, the retaining ring comprising:

[0050] an annular wall extending in the axial direction of the coil disc and located at an outer periphery of the coil disc, the annular wall being connected to the mounting frame; and

[0051] an annular retaining rib extending around an inner peripheral surface of the annular wall, the annular retaining rib being located on a side of the coil disc facing away from the mounting frame, and in a projection of the electromagnetic heating module in the axial direction of the coil disc, the annular retaining rib coincides with an outer peripheral edge of the coil disc in a circumferential direction of the coil disc.

[0052] According to the present application, the annular retaining rib can block the gap at the peripheral edge of the coil disc, which is not only aesthetically pleasing, but also prevents foreign matter from entering the interior of the electromagnetic heating module and affecting the rotation of the coil disc.

[0053] Optionally, the electromagnetic heating module further comprises a plurality of rollers, the plurality of rollers being arranged at intervals in the circumferential direction of the coil disc at the annular wall and / or the mounting frame, the rollers being used to contact the coil disc in the axial direction and / or the radial direction of the coil disc.

[0054] According to the present application, the rollers and the corresponding contact structure can limit the eccentric rotation of the coil disc.

[0055] Optionally, the axial direction of the roller is the same as the axial direction of the coil disc, and the outer peripheral edge of the coil disc is provided with a groove for accommodating the roller.

[0056] According to the application, the rolling wheel and the groove can at least limit the eccentric rotation of the coil disc in the radial direction.

[0057] Optionally, the annular wall is detachably connected to the mounting frame,

[0058] One end of the rotating shaft of the rolling wheel is arranged at the annular wall, and the other end of the rotating shaft of the rolling wheel is arranged at the mounting frame.

[0059] According to the application, the rolling wheel is convenient to disassemble.

[0060] Optionally, the first coil and the second coil are formed by winding the same enameled wire, and the mounting frame is provided with an opening hole for the enameled wire or the connecting cable thereof to pass through.

[0061] According to the application, the coil is connected with the control device on the side of the mounting frame away from the coil, which is convenient for assembly.

[0062] Optionally, the side of the mounting frame away from the coil disc is provided with a wire slot for accommodating the enameled wire or the connecting cable thereof; and / or

[0063] The side of the mounting frame away from the coil disc is provided with a wire clamp for limiting the enameled wire or the connecting cable thereof.

[0064] According to the application, the wire slot and the wire clamp are beneficial to guide and fix the cable, avoiding winding of the cable.

[0065] Optionally, a revolute pair structure is arranged between the inner circumferential surface of the cylindrical part of the coil disc and the shell of the temperature sensor, and the center axis of the revolute pair structure is the center axis of the coil disc.

[0066] According to the application, the temperature sensor and the coil disc can relatively rotate, which can realize the effect of "pot rotation, magnetic field not rotation".

[0067] Optionally, one end of the temperature sensor for contacting the cooking container is provided with a clutch, the clutch is used for detachable connection of the surface of the cooking container, and the electromagnetic heating module is configured to keep the relative position of the clutch and the temperature sensor unchanged; and / or

[0068] The temperature sensor is configured such that the shell of the temperature sensor and the cable of the temperature sensor can relatively rotate around the center axis of the temperature sensor.

[0069] According to the application, the temperature sensor drives the cooking container to rotate through the clutch. The cable of the temperature sensor can not rotate, thereby facilitating wiring.

[0070] Optionally, the first coil and the second coil are arranged on a side of the coil disc facing away from the cooking container; and / or

[0071] The axial section of the coil disc is a C-shaped structure.

[0072] According to the present application, the coils are arranged on a side of the coil disc facing the mounting frame, which can hide the coils and protect the coils. The axial section of the coil disc is a C-shaped structure, which can adapt to the bottom shape of the cooking container and make the alternating magnetic field better act on the cooking container.

[0073] Optionally, the electromagnetic heating module further comprises at least one bobbin, the bobbin is arranged corresponding to the first coil, the first coil is arranged on the bobbin, and the bobbin is arranged on the coil disc.

[0074] According to the present application, the bobbin is beneficial to pre-winding the coil disc into a desired shape.

[0075] Optionally, at least one magnetic guide is further arranged on the bobbin.

[0076] According to the present application, the magnetic guide can concentrate the magnetic field of the coil, which is beneficial to improve the heating efficiency.

[0077] Optionally, the electromagnetic heating module further comprises:

[0078] A driving device for providing a driving force for relative rotation between the coil disc and the temperature sensor; and

[0079] A transmission device connecting the driving device and one of the coil disc and the temperature sensor.

[0080] Further, the driving device comprises a motor;

[0081] The transmission device comprises:

[0082] A first gear coaxially connected with the coil disc or the temperature sensor, and

[0083] A second gear coaxially connected with the output shaft of the motor and engaged with the first gear.

[0084] According to the present application, the driving device and the transmission device are simple in control, stable in performance, and low in cost.

[0085] Optionally, the first gear and the second gear are non-metal gears; and / or

[0086] The first gear and / or the second gear is configured with a weight-reducing hole.

[0087] According to the present application, the non-metal gear can avoid electromagnetic interference with the coil. The weight-reducing hole can reduce the weight of the transmission device and reduce the load of the driving device.

[0088] Optionally, the second gear has a tooth number ratio of 1:1, 1:2, 1:3 or 1:4 with the first gear.

[0089] According to the present application, the tooth number ratio can be flexibly set.

[0090] Optionally, the electromagnetic heating module further comprises a magnetic shield covering the motor, for shielding electromagnetic interference between the motor and the coil.

[0091] The second aspect of the present application provides an electromagnetic heating cooking appliance, comprising:

[0092] the electromagnetic heating module according to any one of the first aspect; and

[0093] a cooking container comprising a ferromagnetic material, for being placed substantially coaxially with the electromagnetic heating module within a magnetically inducible region of the electromagnetic heating module,

[0094] wherein the electromagnetic heating cooking container is configured such that at least a portion of the electromagnetic heating module and the cooking container are relatively rotatable about a coaxial axis, so that the alternating magnetic field of the first coil and the cooking container are relatively rotatable about the coaxial axis.

[0095] According to the present application, the first coil can provide a magnetic field that is non-uniformly distributed along the circumferential direction of the cooking container, and the second coil can provide a magnetic field that is uniformly distributed along the circumferential direction of the cooking container. When the magnetic field rotates relative to the cooking container, the magnetic field of the first coil forms the effect of multi-point heat source rotational heating, and the magnetic field of the second coil forms the effect of fixed heat source heating. Thus, the heat sources of the two coils can be complementary, so that the convection of the food material has both fixed direction convection and changing direction convection, and the food material is fully rolled, which is conducive to improving the cooking quality. BRIEF DESCRIPTION OF DRAWINGS

[0096] 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. In the drawings:

[0097] Figure 1 is a side view cross-sectional schematic view of an electromagnetic heating cooking appliance according to a first embodiment of the present application;

[0098] Figure 2 is Figure 1 is an exploded schematic view of the electromagnetic heating cooking appliance shown, wherein the cover is omitted;

[0099] Figure 3 is Figure 1 an enlarged view of part A in Fig. 1;

[0100] Figure 4 is Figure 2 a bottom perspective view of the electromagnetic heating module in Fig. 1, with the mounting frame omitted;

[0101] Figure 5 is Figure 2 a bottom view of the wire coil assembly of the electromagnetic heating module in Fig. 1;

[0102] Figure 6 is Figure 5 a schematic view of the first coil and the coil disc in Fig. 1;

[0103] Figure 7 is Figure 5 a schematic view of the second coil and the coil disc in Fig. 1;

[0104] Figure 8 is Figure 6 a CFD heat flow analysis diagram of the wire coil assembly shown in Fig. 1;

[0105] Figure 9 is Figure 5 a CFD heat flow analysis diagram of the wire coil assembly shown in Fig. 1;

[0106] Figure 10 is Figure 2 an exploded view of the electromagnetic heating module in Fig. 1;

[0107] Figure 11 is Figure 2 another exploded view of the electromagnetic heating module in Fig. 1, with some components combined;

[0108] Figure 12 is Figure 2 still another exploded view of the electromagnetic heating module in Fig. 1, with the retaining ring omitted;

[0109] Figure 13 is Figure 2 a perspective view of the retaining ring of the electromagnetic heating module in Fig. 1;

[0110] Figure 14 is Figure 3 an enlarged view of part B in Fig. 1;

[0111] Figure 15 is Figure 2 another top perspective view of the electromagnetic heating module in Fig. 1, showing the wiring structure;

[0112] Figure 16 is Figure 2 a perspective view of part of the structure of the electromagnetic heating module in Fig. 1;

[0113] Figure 17 is a perspective view of a part of the structure of the electromagnetic heating module in Figure 2 , wherein the coil disc is rotated counterclockwise by an angle relative to the position in Figure 16 ;

[0114] Figure 18 is a perspective view of a part of the structure of the electromagnetic heating module in Figure 2 , wherein the coil disc is rotated clockwise by an angle relative to the position in Figure 16 ;

[0115] Figure 19 is a side view of a schematic cross-section of an electromagnetic heating cooking appliance according to a second embodiment of the present application.

[0116] BRIEF DESCRIPTION OF REFERENCE NUMERALS: 100 / 100A: cooking appliance

[0117] 200: cover body

[0118] 300: cooking container

[0119] 400: control device

[0120] 401: third connecting hole

[0121] 500: base

[0122] 600 / 600A: electromagnetic heating module

[0123] 601: blocking ring

[0124] 602: blocking structure

[0125] 603: coil holder

[0126] 604: rotating substructure

[0127] 605: temperature sensor

[0128] 606: electromagnetic coil

[0129] 607: wire holder

[0130] 608: magnetic conducting member

[0131] 609: first gear

[0132] 610: mounting bracket

[0133] 611: second gear

[0134] 612: magnetic shield

[0135] 613: motor

[0136] 614: first main cable

[0137] 615: second main cable

[0138] 616 / 617 / 618: screw

[0139] 620 / 623 / 624: line card

[0140] 621: first card slot

[0141] 622: second card slot

[0142] 625: motor cable

[0143] 626: temperature sensor cable

[0144] 627: annular rib

[0145] 628: first connecting hole

[0146] 629: second connecting hole

[0147] 630: roller

[0148] 631: spring

[0149] 632: positioning slot

[0150] 633: recess

[0151] 635: coil disc cylindrical portion

[0152] 636: rotating shaft

[0153] 637: enameled wire

[0154] 641: first surface

[0155] 642: second surface

[0156] 643: third surface

[0157] 644: wire passing hole

[0158] 645: mounting bracket cylindrical portion

[0159] 646: connecting lug

[0160] 647: annular wall

[0161] 648: fourth surface

[0162] 651: blocking portion

[0163] 652: connecting portion

[0164] 656: temperature sensor housing

[0165] 657: clutch

[0166] 664: position detection assembly

[0167] 665: first trigger device

[0168] 666: second trigger device

[0169] 667: position detection assembly cable

[0170] 673: mounting slot

[0171] 674: mounting through hole

[0172] 700: pot body

[0173] 701: middle plate

[0174] 702: connecting column

[0175] 703: inner cylinder

[0176] 705: containing cavity

[0177] 706: containing cavity side wall

[0178] 707: housing

[0179] 800: wire coil assembly

[0180] 01: winding center of first coil

[0181] 02: winding center of second coil

[0182] P1: center axis of electromagnetic heating module

[0183] P2: center axis of cooking container

[0184] P3: center axis of coil disc

[0185] P4: center axis of temperature sensor DETAILED DESCRIPTION

[0186] In the following description, numerous specific details are given to provide a thorough understanding of the application. However, it will be apparent that the application can be practiced without one or more of the specific details. In other instances, well-known techniques have not been described in order to avoid obscuring the application.

[0187] For a thorough understanding of the present application, reference will be made to the following description. It is appreciated that these embodiments are given to enable a thorough and complete disclosure of the present application, and to convey fully the best mode of carrying out the present application to those skilled in the art. Obviously, the implementation of the present application should not be limited to particular details listed herein but can vary from these details without departing from the spirit and scope of the present application. The preferred embodiments of the present application will be described in detail below with reference to the attached drawings.

[0188] The ordinal numbers such as "first" and "second" cited in the present application are merely identifiers but do not have any other meaning, for example, a particular order. Also, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component". The use of the ordinal numbers "first", "second", and "third" does not indicate any order, and the ordinal numbers can be interpreted as names.

[0189] It is noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and similar terms are used for explanation purposes only and are not limiting.

[0190] In the present application, "equal", "same", and the like are not limited in the strict mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and allowed in manufacturing or use, etc.

[0191] Unless otherwise indicated, numerical ranges in this document are inclusive of the entire range and also of sub-ranges within the range.

[0192] The present application provides an electromagnetic heating cooking appliance.

[0193] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings.

[0194] As Figure 1 and Figure 2As shown, the electromagnetic induction heating (IH) cooking appliance 100 according to the first embodiment of the present application (referred to as the cooking appliance 100) comprises a pot body 700, a cover body 200 and a base 500. The pot body 700 is used for cooking heating, for example, comprising a cooking container 300 for containing food materials and an electromagnetic induction heating module 600 (IH heating module 600) for heating the cooking container 300. The cooking container 300 is removably arranged in a receiving cavity 705 of the pot body 700. The IH heating module 600 is arranged at the bottom of the receiving cavity 705, for example. Thus, the cooking container 300 is placed in the magnetically inductive area of the electromagnetic induction heating module 600 in a separable manner. The cover body 200 is connected with the pot body 700 and is used for covering the pot body 700. For example, the cover body 200 can be flipped up to open the pot body 700 and flipped down to close the pot body 700. The base 500 is connected with the pot body 700. The base 500 is located at the bottom of the cooking appliance 100 and is used for supporting the pot body 700.

[0195] The pot body 700 comprises a shell 707, a middle plate 701 and an inner cylinder 703, for example. The middle plate 701 is located at the top of the pot body 700 inside the shell 707 and forms at least the upper surface of the pot body 700. The inner cylinder 703 is connected to the lower side of the middle plate 701 and extends in the up-down direction.

[0196] The shell 707 and the base 500 enclose the receiving cavity 705, and the middle plate 701 and the inner cylinder 703 divide the receiving cavity 705. The inner cylinder 703 can also be regarded as a cavity wall of the receiving cavity 705, and the space between the inner cylinder 703 and the shell 707 can be used to install other components of the pot body 700, such as a fan, a circuit board, etc. 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 preservation effect of the cooking container 300 is improved, and the safety of the cooking appliance 100 is improved.

[0197] The electromagnetic heating module 600 has an electromagnetic heating module center axis P1. The magnetic field strength of the alternating magnetic field generated by the electromagnetic heating module 600 is non-uniformly distributed along the circumferential direction of the electromagnetic heating module. The cooking vessel 300 has a cooking vessel center axis P2. The cooking vessel 300 has a shape of a solid of revolution (for example, has a circular cross section) with the cooking vessel center axis P2 as the axis of revolution. The cooking vessel 300 is configured to be disposed in the magnetically inductive region of the electromagnetic heating module 600, for example, is configured to be separably disposed in the magnetically inductive region of the electromagnetic heating module 600. When the cooking vessel 300 is placed in the accommodation cavity 705, the cooking vessel center axis P2 coincides or substantially coincides with the electromagnetic heating module center axis P1. Thus, the alternating magnetic field of the electromagnetic heating module 600 is non-uniformly distributed along the circumferential direction of the cooking vessel 300.

[0198] The cooking appliance 100 is configured such that at least part of the electromagnetic heating module 600 and the cooking vessel 300 can be relatively rotated around the coaxial axis (P1 / P2) to relatively rotate the alternating magnetic field of the electromagnetic heating module 600 and the cooking vessel 300, so that the cooking vessel 300 can be uniformly heated.

[0199] For example, in the first embodiment shown, the cooking appliance 100 is configured such that at least part of the electromagnetic heating module 600 can be rotated relative to the cooking vessel 300 around the electromagnetic heating module center axis P1.

[0200] Specifically, as shown in FIG. 1, the electromagnetic heating module 600 includes, for example, a coil assembly 800, a mounting frame 610, a transmission device, and a driving device. Figures 2 to 5 As shown in FIG. 1, the coil assembly 800 includes at least one first coil 606 and one second coil 634. The first coil 606 and the second coil 634 can generate an alternating magnetic field when energized, thereby generating electromagnetic induction with the cooking vessel 300, so that the cooking vessel 300 is heated, and in turn, the food in the cooking vessel 300 is heated. The winding center of the first coil 606 is offset from the center axis P1 of the electromagnetic heating module 600, which makes the first alternating magnetic field of the first coil 606 non-uniformly distributed along the circumferential direction of the electromagnetic heating module 600. The winding center of the second coil 634 is located on the center axis P1 of the electromagnetic heating module 600, which makes the second alternating magnetic field of the second coil 634 uniformly distributed along the circumferential direction of the electromagnetic heating module 600. The magnetic fields of the first coil 606 and the second coil 634 jointly act on the cooking vessel 300. Thus, the magnetic field of the electromagnetic heating module 600 is the resultant magnetic field of the first alternating magnetic field and the second alternating magnetic field, which is non-uniformly distributed along the circumferential direction of the electromagnetic heating module 600.

[0201] Figure 5

[0202] ​​The center axis of the wire coil assembly 800 is also the center axis P1 of the electromagnetic heating module. When the wire coil assembly 800 rotates relative to the cooking container 300, the first alternating magnetic field forms the effect of multi-point heat source rotating heating, and the second alternating magnetic field forms the effect of heat source heating with fixed position. Moreover, the heat sources of the second alternating magnetic field are uniformly distributed along the circumferential direction of the cooking container 300. Therefore, the heat source provided by the first coil 606 can change the heating position of the food, thereby changing the heat convection direction, effectively promoting the rolling of the food, and the heat source provided by the second coil 634 can heat the food stably and maintain the fixed heat convection direction, and the combination of the two can have a complementary effect (especially the fixed heat source can make up for the insufficient heat distribution of the rotating heat source), thereby improving the cooking quality.

[0203] The first coil 606 and the second coil 634 are both formed by winding a varnished wire. The first coil 606 can be formed by winding the same varnished wire 637 as the second coil 634, so that the first coil 606 and the second coil 634 are in series and work at the same time. Alternatively, the first coil 606 and the second coil 634 can be formed by winding different varnished wires, and the heating work of the two is independent of each other.

[0204] The first coil 606 is configured, for example, as a plurality of coils distributed along the circumferential direction of the wire coil assembly 800. Generally, the first coil 606 is wound in a disc shape, which makes the side of the first coil 606 close to the center axis P1 of the electromagnetic heating module a weak heating area. In order to make up for the insufficient heat distribution of the rotating heat source of the first coil 606, at least part of the second coil 634 is located between the first coil 606 and the center axis P1 of the electromagnetic heating module. Optionally, the second coil 634 is located entirely between the first coil 606 and the center axis P1 of the electromagnetic heating module 600, so that the second coil 634 is concentrated in the place where the heat of the rotating heat source of the first coil 606 is insufficient, and the place where the heat of the first coil 606 is sufficient is no longer considered, so as to save the length of the varnished wire of the second coil 634.

[0205] In order to enable the magnetic field to rotate, the wire disc assembly 800 further comprises a coil disc 603, preferably the first coil 606 and the second coil 634 are both arranged on the coil disc 603. The coil disc 603 is rotatable, specifically rotatable about the electromagnetic heating module central axis P1, which is for example also the central axis P3 of the coil disc 603. 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 first coil 606 and the second coil 634 are arranged on the coil disc 603, for example on the same side of the coil disc 603, for example on the bottom surface of the coil disc 603, that is, the side facing away from the cooking container 300, so as to be driven to rotate by the coil disc 603. The coil disc 603 is arranged on the mounting frame 610 and can rotate relative to the mounting frame 610 about the coil disc central axis P3. The mounting frame 610 is a component for supporting various functional components in the electromagnetic heating module 600. A driving device is arranged on the mounting frame 610 for providing a driving force for rotating the coil disc 603. A 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.

[0206] The axial direction of the coil disc 603 is also the axial direction of the electromagnetic heating module 600. The circumferential direction of the coil disc 603 is also the circumferential direction of the electromagnetic heating module 600. The radial direction of the coil disc 603 is also the radial direction of the electromagnetic heating module 600. In actual use of the cooking appliance 100, the axial direction of the coil disc 603 is the up-down direction. The axial direction of the coil disc 603 is also the axial direction of the wire disc assembly 800. The circumferential direction of the coil disc 603 is also the circumferential direction of the wire disc assembly 800. The radial direction of the coil disc 603 is also the radial direction of the wire disc assembly 800.

[0207] The electromagnetic heating module 600 as a whole can be mounted to the cavity wall of the receiving cavity 705 by means of the mounting frame 610, so that the electromagnetic heating module can be pre-assembled as a whole first, and then mounted in the receiving cavity 705. In this way, it is possible to avoid mounting the scattered components one by one in the receiving cavity 705, for example, mounting them one by one to the base 500, avoiding the influence of the installation precision of the mounting site components, enabling the components of the electromagnetic heating module 600 to have high installation precision, facilitating assembly in the cooking appliance 100, ensuring normal operation and cooking effect of the cooking appliance 100, and improving the user experience.

[0208] For example, as shown in FIG. 6, the first coil 606 and the second coil 634 are arranged on the same side of the coil disc 603, for example, on the bottom surface of the coil disc 603, that is, the side facing away from the cooking container 300. In this way, the first coil 606 and the second coil 634 are driven to rotate by the coil disc 603. Figure 5 For example, as shown in FIG. 6, the first coil 606 and the second coil 634 are arranged on the same side of the coil disc 603, for example, on the bottom surface of the coil disc 603, that is, the side facing away from the cooking container 300. In this way, the first coil 606 and the second coil 634 are driven to rotate by the coil disc 603. Figure 6As shown, "non-concentric" means that the spiral winding center point O1 of the coil 606 is not collinear with the central axis P3 of the coil disk 603, that is, the winding center O1 of the coil 606 deviates from the central axis P3 of the coil disk. For example, the electromagnetic heating module 600 includes only one first coil 606, and the winding center of the first coil 606 deviates from the central axis P3 of the coil disk 603. Alternatively, the electromagnetic heating module 600 includes at least two first coils 606, and all the first coils 606 are spaced apart along the circumferential direction of the coil disk 603. For example, the electromagnetic heating module 600 includes N first coils 606, and all the first coils 606 are equally spaced along the circumferential direction of the coil disk 603, 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 module 600 includes 3 first coils 606, and all the first coils 606 are equally spaced (120-degree circumferential angle) along the circumferential direction of the electromagnetic heating module.

[0209] In this paper, all the first coils 606 are equally spaced along the circumferential direction of the coil disk 603. This can be understood as the center point O1 of each first coil 606 being on the same circle with a point on the axis P3 as the center, and the center points O1 of all the first coils 606 being equally spaced on this circle. The coil disk 603 and all the first coils 606 form a rotationally symmetric structure with the axis P3 as the rotational symmetry center and 360 / N degrees as the rotation angle.

[0210] The number of first coils 606 is set according to the electromagnetic heating power required. Multiple first coils 606 can be connected in series, for example, they can be made by winding a single enameled wire.

[0211] 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.

[0212] like Figure 5 As shown, the second coil 634 is concentrically arranged with the coil disk 603. Figure 7As shown, "concentric" means that the spiral winding center point O2 of the winding of the second coil 634 is collinear with the central axis P3 of the coil disc 603, that is, the winding center O2 of the second coil 634 is on the central axis P3 of the coil disc. When the second coil 634 and the first coil 606 are both arranged on the same coil disc 603, in order to facilitate wiring, the second coil 634 is entirely located between the first coil 606 and the central axis of the coil disc 603.

[0213] Preferably, the first coil 606 is wound by the enameled wire 637 in a first direction, and the second coil 634 is wound by the enameled wire 637 in a second direction, wherein the first direction is opposite to the second direction (for example, one is clockwise and the other is counterclockwise). By winding the first coil 606 and the second coil 634 in opposite directions, the current directions in the conductive wires in the areas where the first coil 606 and the second coil 634 are close to each other are consistent, and thus the magnetic field directions are consistent. When IH heating, there is no interference between the coils, and continuous area heating can be achieved. Conversely, if the first coil 606 and the second coil 634 are wound in the same direction, the current directions in the conductive wires in the areas where the first coil 606 and the second coil 634 are close to each other are opposite, and thus the magnetic field directions are opposite, forming differential mode interference, and the electromagnetic fields generated by each other cancel out, resulting in heating failure.

[0214] The length of the coil corresponds to the heating power of the coil. Optionally, the ratio of the effective length (the length of the part used to form the inductance) of the enameled wire of the second coil 634 to the effective length of the enameled wire of a single first coil 606 ranges from 1:1 to 1:4. For example, the ratio of the effective length of the enameled wire of the second coil 634 to the effective length of the enameled wire of a single first coil 606 is 1:2. For example, the total length of the enameled wire 637 is designed to be about 14 meters, the effective length of the enameled wire of the second coil 634 is 2 meters, and the effective length of the enameled wire of a single first coil 606 is 4 meters, and the effective length of the three first coils 606 is 12 meters in total. By adopting a suitable ratio of the lengths of the conductive wires of the first coil 606 and the second coil 634, the power of the first coil 606 and the second coil 634 can be reasonably distributed, and the power imbalance of the first coil 606 and the second coil 634 can be avoided, so that a relatively obvious convection rolling in the pot body 300 cannot be formed, and the cooking effect is affected.

[0215] When the IH heating control is unchanged, and the multiple coils are wound by one wire, the winding length proportion of each coil can represent the heating power distribution proportion. When the total heating power is constant, the power proportion of the concentric coil to the non-concentric coil should not be too large or too small. When the power distribution proportion of the concentric coil is too large, the heating power of the non-concentric coil becomes small, at this time, the center heat source is too strong, the edge heat source is weak, and the relatively obvious cold and hot areas cannot be formed in the cooking container 300, and the convection rolling is weak. When the power distribution proportion of the concentric coil is too small, similar to the prior art in which only the non-concentric coil is arranged, the bottom center convection rolling in the cooking container 300 is weak.

[0216] Figure 8 CFD heat flow analysis diagram of the coil disc assembly 800 when only the first coil 606 is used, Figure 9 CFD heat flow analysis diagram of the coil disc assembly 800 when the first coil 606 and the second coil 634 are used at the same time. It can be seen from the comparison that, Figure 8 the fluid flow speed at the center of the first coil 606 is slow (blue beam), indicating that the rolling is weak, and the fluid flow speed at the edge and the heat source is fast (red and green beams), indicating that the rolling in this area is strong. While Figure 9 the fluid flow speed at the center of the second coil 634 is obviously enhanced, that is, the convection rolling at the center is enhanced.

[0217] The inventor also uses red rice to cook rice for rolling test. The test method is: a preset weight (for example, 200g) of red rice is laid on the bottom of the pot 300, a preset weight (for example, 400g) of white rice is laid on the red rice, and then a preset weight (for example, 840g) of water is added for cooking test. The red rice and white rice are different in color, and their distribution can be easily distinguished. According to the distribution, the convection can be judged. After the red rice rolling test, the red rice at the bottom of the cooking container 300 is completely rolled to the upper surface, realizing the global convection rolling effect in the pot.

[0218] CFD heat flow analysis can also help to adjust the power of each heat source and the relative position of the heat source. By comparing the fluid rolling effects in various schemes, the convection rolling at the center of the bottom of the cooking container 300 is enhanced according to the analysis results. Then, the coil is made according to the optimal scheme obtained by CFD, and is mounted on the whole cooking appliance 100.

[0219] As shown in Figure 3 , the axial section of the coil disc 603 includes a C-shaped structure, and the cooking container 300 is located inside the C-shaped structure, so that the coil disc 603 conforms to the shape of the bottom 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 coils 606 and 634 are arranged on the side of the coil disc 603 facing the mounting frame 610 (the coils 606 and 634 are located outside the C-shaped structure), so as to avoid being exposed in the accommodation cavity 705.

[0220] Optionally, as shown in Figure 10 , the coil disc 603 is provided with a positioning groove 632, and the first coil 606 is arranged in the positioning groove 632. The positioning groove 632 is arranged, for example, on the bottom surface of the coil disc 603, and the groove bottom protrudes towards the cooking container 300, so that the top of the positioning groove 632 protrudes from the surface of the coil disc 603 to form a boss structure. By arranging the positioning groove 632 on the coil disc 603, the first coil 606 is facilitated to be installed, and the first coil 606 is prevented from moving position on the bottom surface of the coil disc 603, thereby improving the stability of the first coil 606.

[0221] Optionally, as shown in Figure 3 and Figure 10 , the coil disc assembly 800 further comprises a winding frame 607, which is arranged on the coil disc 603, for example, in the positioning groove 632. The winding frame 607 is arranged corresponding to the first coil 606, and the first coil 606 is arranged on the winding frame 607, that is, is coiled on the winding frame 607. The winding frame 607 is constructed, for example, as a sandwich structure, and a winding column is arranged at the center of the sandwich, and the enameled wire of the coil 606 is coiled in a disc shape around the winding column in the sandwich. The winding frame 607 and the coil disc 603 can be fixed in the positioning groove 632 by screw connection. By arranging the first coil 606 in the coiled state in the winding frame 607, the first coil 606 is facilitated to be assembled on the coil disc 603, and the first coil 606 can also be effectively prevented from being scattered, thereby improving the stability of the first coil 606 itself.

[0222] Optionally, as shown in Figure 3 and Figure 10 , the coil disc assembly 800 further comprises at least one magnetic conducting member 608, which is arranged, for example, on the bottom surface of the winding frame 607 and corresponding to the first coil 606, and can guide the electromagnetic field generated by the first coil 606 when energized to converge towards the cooking container 300. The magnetic conducting member 608 and the winding frame 607 can be fixed by clamping. In the illustrated embodiment, a plurality of magnetic conducting members 608 are arranged corresponding to each first coil 606. The magnetic conducting member 608 is constructed, for example, as a long strip of magnetic conducting strips, and a plurality of magnetic conducting strips are distributed equidistantly along the circumferential direction of the coil 606 in a radial star shape. The magnetic conducting member 608 can also be configured as a ring-shaped magnetic conducting strip. By arranging the magnetic conducting member 608 corresponding to the first coil 606, the magnetic field generated by the first coil 606 when energized can be guided to act on the cooking container 300 of the cooking appliance 100, thereby improving the heating efficiency.

[0223] Optionally, as shown in Figure 3 , Figure 4 , Figure 10 and Figure 11As shown, the driving device of the electromagnetic heating module 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. The motor 613 is mounted on the mounting frame 10 (see Figure 11 ) through screws 618, for example. Preferably, the electromagnetic heating module 600 further comprises a magnetic shield 612 covering the motor 613 for shielding electromagnetic interference between the motor 613 and the first coil 606. The magnetic shield 612 can adopt materials such as aluminum and copper having a magnetic shielding function.

[0224] Optionally, as shown in Figure 3 , Figure 4 and Figure 10 , the transmission device of the electromagnetic heating module 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 provided, 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 with a plurality of preset transmission ratios.

[0225] 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.

[0226] 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 facilitates 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.

[0227] Optionally, as shown in Figure 3 , Figure 10 and Figure 12As shown, a substantially central part of the coil disc 603 is provided with a coil disc cylindrical part 635 protruding towards the mounting rack bottom wall 671 along the axial direction of the coil disc 603, and the mounting rack 610 is provided with a mounting rack cylindrical part 645 protruding towards the coil disc 603 along the axial direction of the coil disc 603. The cooking utensil 100 is configured such that the coil disc cylindrical part 635 and the mounting rack cylindrical part 645 are adapted and rotationally connected, so that the coil disc cylindrical part 635 is rotatable relative to the mounting rack cylindrical part 645 about the coil disc central axis P3. Thus, the coil disc 603 is rotatable relative to the mounting rack 610 about the coil disc central axis P3.

[0228] Specifically, the cooking utensil 100 is configured such that one of the mounting rack cylindrical part 645 and the coil disc cylindrical part 635 is at least partially located in the other of the mounting rack cylindrical part 645 and the coil disc cylindrical part 635, and the coil disc cylindrical part 635 and the mounting rack cylindrical part 645 are connected through a 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 part 635 and the mounting rack cylindrical part 645 are, for example, two cylinders, which are nested, and 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 rack 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.

[0229] The revolute pair structure 604 can be configured as a rolling revolute pair structure or a sliding revolute pair structure. Alternatively, the revolute pair structure 604 is made of a non-metallic material, for example, the bearing is a non-metallic bearing, which can be made of plastic, ceramic, or other non-metallic materials. 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.

[0230] In the illustrated embodiment, the coil disc cylindrical part 635 is outside, and the mounting rack cylindrical part 645 is inside. Of course, the coil disc cylindrical part 635 can also be inside, and the mounting rack cylindrical part 645 can be outside. The first gear 609 can be, for example, sleeved on the outer peripheral surface of the coil disc cylindrical part 635 of the coil disc 603 and driven through a key. Alternatively, the coil disc 603 can be integrally injection molded with the first gear 609.

[0231] Preferably, as Figure 3As shown, the outer peripheral surface of the one of the mounting frame cylindrical portion 645 and the coil disc cylindrical portion 635 located at the inner side is provided with a first surface 641 extending in the radial direction, and the inner peripheral surface of the other of the mounting frame 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.

[0232] The second coil 634 can be arranged on the outer periphery of the coil disc cylindrical portion 635. The second coil 634 is, for example, spirally wound on the coil disc cylindrical portion 635 with the coil disc cylindrical portion 635 as the winding column.

[0233] Optionally, as shown in Figure 3 , Figure 4 , Figure 10 and Figure 11 , the electromagnetic heating module 600 further comprises a temperature sensor 605. The top of the temperature sensor 605 can elastically contact the cooking container 300 of the cooking utensil 100 through the coil disc 603. The temperature sensor 605 has a temperature sensor central axis P4. The temperature sensor 605 is arranged in the coil disc cylindrical portion 635 coaxially with the coil disc 603. The temperature sensor 605 can adopt a temperature sensor of NTC type. The electromagnetic heating module 600 further comprises a spring 631. The inner peripheral 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 spring 631 is arranged below the temperature sensor 605, 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 can elastically contact the cooking container 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 peripheral 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.

[0234] The interiors of the coil disc cylindrical portion 635 and the mounting frame cylindrical portion 645 are hollow, which are just used for mounting the temperature sensor 605. In the first embodiment, the temperature sensor 605 does not rotate with the coil disc 603, and the coil disc 603 can rotate relative to the temperature sensor 605 around the axis P1.

[0235] Optionally, as shown in Figure 3 , Figure 10 and Figure 11As shown, the electromagnetic heating module 600 further comprises a blocking structure 602. The blocking structure 602 comprises a blocking portion 651 and a connecting portion 652, for example. The blocking portion 651 is configured as a blocking ring in the radial direction of the coil disc 603. The connecting portion 652 extends substantially perpendicularly to the blocking portion 651. One end of the connecting portion 652 is connected to the blocking portion 651, and the other end is used to connect to the mounting frame 610, such as the mounting frame cylindrical portion 645. The connecting portion 652 extends in the axial direction of the coil disc 603, and is configured as a sleeve (also referred to as a blocking structure cylindrical portion), for example. The connecting portion 652 is located in the coil disc cylindrical portion 635 and is connected to the mounting frame 610 (such as a clamping connection or a threaded connection). The blocking structure 602 is fixedly connected to the mounting frame 610, so as not to rotate with the coil disc 603.

[0236] One end of the connecting portion 652 is connected to the middle of the radial width of the blocking ring of the blocking portion 651 (not necessarily the midpoint of the width of the blocking ring). The outer diameter of the blocking ring of the blocking portion 651 is greater than the inner diameter of the coil disc cylindrical portion 635. The inner diameter of the blocking ring of the blocking portion 651 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 652 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 652 is used to limit the temperature sensor 605. The through hole in the middle of the blocking ring is used to expose the temperature sensor 605, and the temperature sensor 605 can extend out of the through hole under the action of the spring 631.

[0237] Optionally, as shown in Figure 3 、 Figure 10 、 Figure 9 and Figure 13 , the electromagnetic heating module 600 further comprises a retaining ring 601. The retaining ring 601 comprises a ring wall 647 and a ring retaining rib 627, for example. The ring wall 647 extends in the axial direction of the coil disc 603 and is located at the outer periphery of the coil disc 603. The ring wall 647 is connected to the mounting frame 610. The ring retaining rib 627 extends along the inner circumferential surface of the ring wall 647. The ring retaining rib 627 is located on the side of the coil disc 603 facing away from the mounting frame 610. In the projection of the electromagnetic heating module 600 in the axial direction of the coil disc 603, the ring retaining rib 627 coincides with the outer peripheral edge of the coil disc 603 along the circumferential direction of the coil disc 603. The mounting frame 610 integrally wraps the coil disc 603 from below, and the retaining ring 601 is arranged on the top of the mounting frame 610. The ring retaining rib 627 can block the gap around the coil disc 603, which is not only aesthetically pleasing, but also prevents foreign matter from entering the inside of the electromagnetic heating module 600 and affecting the rotation of the coil disc 603.

[0238] At least one of the mounting frame 610 and the retaining ring 601 is directly detachably connected to the cavity wall of the accommodating cavity 705, such as the inner cylinder 703 or the base 500. For example, the retaining ring 601 can be detachably connected to the inner cylinder 703 of the pot body 700. As shown in Figure 2 The outer side of the middle plate 701 is provided with a plurality of connecting columns 702 extending towards the mounting frame 610. The outer side of the annular wall 647 of the retaining ring 601 is correspondingly provided with a first connecting hole 628, and the connecting columns 702 are connected to the first connecting hole 628 by screws, that is, the retaining ring 601 can be connected to the middle plate 701. The outer side of the annular wall 647 of the retaining ring 601 is also provided with a second connecting hole 629, and the edge of the mounting frame 610 is correspondingly provided with a connecting lug 646. The retaining ring 601 and the mounting frame 610 can be detachably connected by screws, and the electromagnetic heating module 600 and the middle plate 701 can be detachably connected. The retaining ring 601 is detachably connected to the cavity wall of the accommodating cavity 705, and the mounting frame 610 is indirectly detachably connected to the cavity wall of the accommodating cavity 705 through the detachable connection with the retaining ring 601. Of course, the mounting frame 610 can be directly detachably connected to the cavity wall of the accommodating cavity 705.

[0239] Optionally, as shown in Figure 14 One of the edge portion of the coil disc 603 and the cavity wall of the accommodating cavity 705 is provided with a plurality of rollers 630 arranged along the circumference of the coil disc 603, and the rollers 630 are used to contact the other one of the edge portion of the coil disc 603 and the cavity wall of the accommodating cavity 705 in the radial and / or axial direction of the coil disc 603. In the illustrated embodiment, one of the edge portion of the coil disc 603 and the side wall 706 of the accommodating cavity 705 is provided with a plurality of rollers 630 arranged along the circumference of the coil disc 603, and the rollers 630 are used to contact the other one of the edge portion of the coil disc 603 and the side wall 706 of the accommodating cavity 705 in the radial and / or axial direction of the coil disc 603. Due to machining errors, installation errors, thermal deformation and other reasons, the coil disc 603 may appear eccentric rotation phenomenon, so that the coil disc 603 cannot stably rotate around a fixed axis. At this time, the rollers 630 and the corresponding structure (hereinafter referred to as the contact structure) contact in the radial and / or axial direction of the coil disc 603, which can limit the degree of eccentricity in the radial and / or axial direction of the coil disc 603 and improve the stability of the rotation of the coil disc 603. At the same time, the rollers 630 can rotate, and the friction force is small when the rollers 630 contact the corresponding contact structure, which basically does not affect the rotation of the coil disc 603.

[0240] The rollers 630 are preferably made of hard (good rigidity), wear-resistant and high-strength materials to reduce contact friction and ensure service life.

[0241] A gap is provided between the coil disc 603 and the contact structure to accommodate the thermal deformation of the coil disc 603 or the unevenness of the processing. Optionally, the maximum gap between the outer surface of the roller 630 and the contact structure is 0.3-5mm. In other words, the roller 630 and the corresponding contact structure limit the eccentricity of the coil disc 603 to 0.6-10mm.

[0242] Preferably, the rollers 630 are arranged at least at 3 spaced-apart positions along the circumferential direction of the coil disc 603. For example, the rollers 630 are arranged at 3-6 spaced-apart positions along the circumferential direction of the coil disc 603. The plurality of rollers 630 are, for example, equidistantly distributed.

[0243] In the illustrated embodiment, one of the edge portion of the coil disc 603 and the side wall 706 of the accommodating cavity 705 is provided with a plurality of rollers 630 arranged along the circumferential direction of the coil disc 603, the axial direction of the roller 630 is the same as the axial direction of the coil disc 603, and the other of the edge portion of the coil disc 603 and the side wall 706 of the accommodating cavity 705 is provided with a groove 633 extending along the circumferential direction of the coil disc 603, the slot and the groove bottom of the groove 633 are arranged along the radial direction of the coil disc 603, and the groove 633 is used to accommodate the roller 630. Thus, the groove 633 is the corresponding contact structure, and the cooperation between the groove 633 and the roller 630 can at least limit the eccentricity of the coil disc 603 in the radial direction. As shown, the maximum distance a between the outer surface of the roller 630 at the maximum radial dimension and the groove bottom of the groove 633 along the radial direction of the coil disc 603 is 0.3-5mm.

[0244] Specifically, the side wall 706 of the accommodating cavity 705 is provided with the roller 630, and the edge portion of the coil disc 603 is provided with the groove 633. The annular wall 647 of the retainer ring 601 provides a portion (also referred to as a first side wall) of the side wall 706 of the accommodating cavity. The side wall 672 of the mounting frame provides another portion (also referred to as a second side wall) of the side wall 706 of the accommodating cavity 705. The first side wall and the second side wall are arranged along the axial direction of the coil disc 603 (i.e., the axial direction of the second accommodating cavity 705). One end of the rotating shaft 636 of the roller 630 is connected to the first side wall, and the other end is connected to the second side wall. As described above, the first side wall and the second side wall are detachably connected, so that the installation of the roller 630 can be completed at the same time as the connection of the first side wall and the second side wall. For example, the first side wall is provided with a mounting groove 673 for accommodating one end of the rotating shaft 636. The second side wall is provided with a mounting through hole 674 for accommodating the other end of the rotating shaft 636. After the coil disc 603 is connected to the mounting frame 610, the roller 630 is roughly aligned with the groove 633, so that the rotating shaft 636 is mounted into the mounting through hole 674. Then, when the mounting frame 610 is connected to the retainer ring 601, the rotating shaft 636 can enter the mounting groove 673 through the alignment design of the mounting positions.

[0245] Understandably, the groove 633 also has an axial limiting effect on the roller 630, which can also limit the axial eccentricity of the coil disk 603.

[0246] Alternatively, the roller 630 can be set on the coil disk 603, and the corresponding groove 633 can be set on the side wall 706 of the second receiving cavity.

[0247] In an embodiment not shown in this application, a plurality of rollers 630 are provided on the edge portion of the coil disk 603 and one of the sidewalls 706 of the second receiving cavity 705, arranged at circumferential intervals along the coil disk 603. The axial direction of the rollers 630 is perpendicular to the axial direction of the coil disk 603 (relative to the axial direction of the coil disk 603). Figure 14 (The state shown is rotated 90 degrees in the plane of the paper). The edge portion of the coil disk 603 and another portion of the second receiving cavity sidewall 706 are provided with an annular contact surface extending in the circumferential direction of the coil disk 603. This annular contact surface is used to contact the outer peripheral surface of the roller 630. It is understood that the radial direction of this annular contact surface is the radial direction of the coil disk 603. This annular contact surface and the roller 630 are aligned in the axial direction of the coil disk 603, for example, located above or below the roller 630. This implementation can limit the axial eccentricity of the coil disk 603. For example, multiple rollers 630 are provided in the second receiving cavity sidewall 706, and the rollers 630 are used to contact the upper or lower surface of the coil disk 603. In other words, the surface of the coil disk 603 itself includes an annular contact surface for contacting the roller.

[0248] Preferably, the maximum distance between the outer surface of the roller 630 at its radial maximum dimension and the annular contact surface along the axial direction of the coil disk 603 is 0.3-5 mm.

[0249] In such an embodiment, the annular contact surface may include a first annular contact surface and a second annular contact surface arranged opposite to each other along the axial direction of the coil disk 603. Multiple rollers 630 may be staggered along the axial direction of the coil disk 603, i.e., installed at different heights. Some rollers 630 are used to contact the first annular contact surface (e.g., the upper surface of the coil disk 603), and other rollers are used to contact the second annular contact surface (e.g., the lower surface of the coil disk 603). Alternatively, multiple rollers 360 may be arranged in pairs, with the pairs of rollers 360 spaced apart along the axial direction of the coil disk, and the first and second annular contact surfaces located between the pairs of rollers 360. This limits the eccentricity of the coil disk 603 in opposite axial directions (e.g., the coil disk 603 being sandwiched between upper and lower rollers). The upper roller may be located, for example, in the annular wall 647 of the retaining ring 601, below the retaining rib 627. The lower roller may be located, for example, in the mounting bracket 610.

[0250] Of course, the roller 630 can also be arranged on the coil disc 603, and the corresponding annular contact surface is arranged on the accommodating cavity side wall 706. For example, the accommodating cavity side wall 706 is provided with the annular contact surface by arranging an annular rib or a stepped surface on the inner circumferential surface.

[0251] Optionally, the cooking utensil 100 further comprises a control device 400. The control device 400 is used to control the operation of all electrically controlled components of the cooking utensil 100. The control device 400 can be arranged on any one of the mounting frame 610, the middle plate 701 and the base 500. Preferably, the control device 400 is arranged on the mounting frame 610 and is electrically connected to the first coil 606 and the second coil 634, the motor 613 and the temperature sensor 605 respectively through cables. As shown in Figure 2 One side of the control device 400 is provided with a third connecting hole 401, which can be connected to the mounting frame 610 through a screw. By connecting the control device 400 to the mounting frame 610, the control device 400 and the mounting frame 610 can be assembled together, thereby being pre-connected to the electromagnetic heating module 600, so that the installation of the electromagnetic heating module 600 in the accommodating cavity 705 is easier.

[0252] Preferably, the mounting frame 610 is provided with an opening hole through which the cables of the electric components of the electromagnetic heating module 600 or the connecting cables thereof pass, so that these cables are connected to the control device 400 on the side of the mounting frame 610 away from the coil disc 603, thereby facilitating the assembly operation. In the present application, each cable of the electric components of the electromagnetic heating module 600 and the connecting cable thereof is referred to as a functional module wiring. Further, the side of the mounting frame 610 away from the coil disc 603 is provided with a wire slot for accommodating these functional module wirings. The side of the mounting frame 610 away from the coil disc can also be provided with a wire clamp for limiting these functional module wirings.

[0253] The first coil 606 and the second coil 634 are wound by the same enameled wire 637. As shown in Figure 15As shown, the main functional module wiring of the electromagnetic heating module 600 includes a first main cable 614 and a second main cable 615. The first main cable 614 is connected to one end of the enameled wire 637 and the control device 400, respectively. The second main cable 615 is connected to the other end of the enameled wire 637 and the control device 400, respectively. Since the first main cable 614 and the second main cable 615 need to rotate with the coil disc 603, the first main cable 614 and the second main cable 615 are provided with U-shaped bends, which have a deformation allowance and will not be wound when the coil disc 603 rotates. The bottom of the mounting frame 610 is provided with a first clamping groove 621 and a second clamping groove 622. The first clamping groove 621 is used to limit the first main cable 614, and the second clamping groove 622 is used to limit the second main cable 615. The bottom of the mounting frame 610 is also provided with a wire clamp 620 for limiting the first main cable 614 and the second main cable 615. As shown in FIG. 6B, the wire clamp 620 is provided with a plurality of clamping grooves 622, which are used to limit the first main cable 614 and the second main cable 615. Figure 11 As shown, the wire terminal of the end of the enameled wire 637 connected to the first main cable 614 and the second main cable 615 can be fixed to the mounting frame 610 by a screw 617, and the wire terminal of the end connected to the control device 400 can be fixed to the circuit board by a screw 616.

[0254] The main functional module wiring of the electromagnetic heating module 600 also includes a motor cable 625 and a temperature sensor cable 626. One end of the motor cable 625 is connected to the motor 613, and the other end is connected to the control device 400. One end of the temperature sensor cable 626 is connected to the temperature sensor 605, and the other end is connected to the control device 400. The side of the mounting frame 610 is provided with a plurality of wire clamps 624 for limiting the motor cable 625 and the temperature sensor cable 626. The bottom of the mounting frame 610 is also provided with a wire clamp 623 for limiting the motor cable 625.

[0255] The electromagnetic heating module 600 is configured such that the alternating magnetic field has N strong magnetic regions and N weak magnetic regions alternately distributed in the circumferential direction of the electromagnetic heating module 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 in the circumferential direction of the electromagnetic heating module 600, and the N weak magnetic regions are equally spaced in the circumferential direction of the electromagnetic heating module 600. Considering the limited length of the connection cable (615 and 615) of the enameled wire 637 of the coil, 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 uniformly and comprehensively. In the illustrated embodiment, N=3.

[0256] As shown in FIG. 6B, the wire clamp 620 is provided with a plurality of clamping grooves 622, which are used to limit the first main cable 614 and the second main cable 615. Figure 12 and Figures 16 to 18As shown, the electromagnetic heating module 600 further comprises a position detection assembly 664 for detecting the rotational position of the coil disc 603, i.e. the rotational position of the first coil 606. For example, the position detection assembly 664 is arranged on the mounting frame 610 and electrically connected to the control device 400. For example, the position detection assembly 664 is electrically connected to the control device 400 through a cable 667. The coil disc 603 is provided with trigger devices (a first trigger device 665 and a second trigger device 666). The trigger devices of the coil disc 603 can trigger the position detection assembly 664 during the rotation of the coil disc 603, so that the control device 400 can know the rotational position of the coil disc 603. For example, the position detection assembly 664 comprises an optical coupling sensor, and the trigger devices can trigger by blocking the light emitted by the optical coupling sensor. Figure 17 and Figure 18 The coil disc 603 is shown to rotate between the positions in the first position and the second position. Figure 16 The control device 400 can take the rotational position of the coil disc 603 when the trigger devices trigger the position detection assembly 664 as the reference position, and combine the output angle of the stepping motor 613, so as to know the rotational angle of the coil disc 603. When the circumferential interval angle between the first trigger device 665 and the second trigger device 666 is 360 / N degrees, the coil disc 603 can be controlled to rotate reciprocatingly between the two trigger positions (the first position and the second position shown in the drawings). Figure 17 and Figure 18 The coil disc 603 is shown to rotate between the positions in the first position and the second position.

[0257] The second embodiment of the present application will be introduced below, and the same design as the first embodiment will not be described again, and only the difference between the two will be emphasized.

[0258] In the second embodiment as shown in Figure 19 The cooking utensil 100A is configured such that the cooking container 300 is rotatable relative to the electromagnetic heating module 600A about the central axis P1 of the electromagnetic heating module 600A, i.e. the cooking container 300 rotates while the alternating magnetic field does not rotate.

[0259] Specifically, the electromagnetic heating module 600A is configured such that the temperature sensor 605 is rotatable relative to the coil disc 603 about the coil disc central axis P3, and the temperature sensor 605 drives the cooking vessel 300 to rotate. For example, one end of the temperature sensor 605 for contacting the cooking vessel 300 is provided with a clutch member 657 for detachably connecting to the surface (e.g. bottom surface) of the cooking vessel 300. The electromagnetic heating module 600A is configured such that the clutch member 657 and the temperature sensor 605 keep a relative position unchanged, i.e. the two are fixedly connected. The clutch member 657 is connected to the housing 656 of the temperature sensor 605 by, for example, bonding, clamping, screwing, or interference fit through a through hole. The clutch member 657 can be detachably connected to the cooking vessel 300 by magnetic attraction, spline, etc. Thus, the clutch member 657 moves synchronously with the temperature sensor 605, and drives the cooking vessel 300 to move synchronously with the temperature sensor.

[0260] The temperature sensor 605 is still arranged in the coil disc cylindrical portion 635 substantially coaxially with the coil disc 603, and a rotary pair structure 604 is arranged between the inner peripheral surface of the coil disc cylindrical portion 635 and the housing 656 of the temperature sensor 605, with the central axis of the rotary pair structure 604 being the central axis of the coil disc 603. Preferably, the temperature sensor 605 is configured such that the housing 656 of the temperature sensor 605 and the cable 626 of the temperature sensor 605 are relatively rotatable about the central axis P4 of the temperature sensor 605. A driving device (e.g. motor 613) is used to drive the housing 656 to rotate. Thus, the housing 656 of the temperature sensor 605 rotates, and the coil disc 603 and the cable 626 do not rotate. The cable 626 does not rotate, so it can be conveniently connected to the control device 400. The coil disc 603 does not rotate, and in order to facilitate the routing of the cable 626, the coil disc 603 is connected to the inner cylinder 703 at the edge position.

[0261] The outer peripheral surface of the housing 656 is provided with a fourth surface 648 extending in the radial direction, and the inner peripheral surface of the coil disc cylindrical portion 635 is provided with a second surface 642 extending in the radial direction. The fourth surface 648 and the second surface 642 are spaced apart in the axial direction of the coil disc 603. The rotary pair structure 604 is located between the fourth surface 648 and the second surface 642, so that the rotary pair structure 604 is limited in the axial direction. The first gear 609 is coaxially connected to the housing 656, so that driving force can be transmitted to the housing 656.

[0262] In summary, the electromagnetic heating module 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 module, 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 module, and the N weak magnetic regions are equally spaced along the circumferential direction of the electromagnetic heating module. Wherein, the electromagnetic heating cooking appliance is configured such that, when the cooking container 300 is located at least above the electromagnetic heating module, the relative rotation between at least part of the electromagnetic heating module and the cooking container 300 can be realized. The relative rotation range is, for example, 360 / N degrees (±180 / N degrees), so that the heating position is not missed, and the cooking container 300 is heated uniformly. In the embodiment shown, N=3.

[0263] 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 module 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 of the cooking container 300 is reduced. 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, the rotation is not heated, and the heating is not rotated, so that the vertical temperature difference in the same vertical plane is reduced 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 rotation, so that uniform heating is achieved.

[0264] The energization of the first coil 606 can be independently controlled with the energization of the second coil 634, or the two can be connected in series to work simultaneously. The first coil 606 and the second coil 634 can also be provided in two components, respectively, as long as the non-uniform alternating magnetic field of the first coil 606 rotates relative to the cooking container 300.

[0265] 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 heat preservation process in sequence. In the water absorption process, the food material is fully watered to improve the taste. In the boiling process, the food material is heated to a temperature close to boiling with a large fire, and then boiled in the boiling maintenance process to make the food material basically cooked. The rice stewing process dries the residual free water to further cook the food material. Finally, in the heat preservation process, the user can eat hot food.

[0266] In each process, the electromagnetic heating module (specifically, the first coil 606 and the second coil 634) as the heating device works in a power-regulated manner. In each power-regulated period, the first coil 606 or the second coil 634 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 length of the 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 possible requirement of the cooking cavity in each process for a suitable temperature, the power of the electromagnetic heating module in each process can not be constant (the preset power-on duration of different power-regulated periods in the same process is different), and can not be in the working state all the time (herein, the electromagnetic heating module in the power-regulated period is considered to be in the working state).

[0267] According to the present application, the electromagnetic heating cooking appliance improves the cooking quality by simultaneously arranging the position-rotating heat source and the position-fixed heat source, so that the heat-reachable ranges of the two are complementary.

[0268] The processes and steps described in all the preferred embodiments above are only examples. Unless an adverse effect occurs, various processing operations can be performed in an order different from the order of the processes described above. The order of the steps of the processes described above can also be added, combined or deleted according to actual needs.

[0269] 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 term "comprising" herein, also includes the terms "including", "containing", "having", and the like.

[0270] The term "attached" or "attach" as used herein includes a configuration in which an element is directly secured to another element by affixing the element directly 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 meaning, such as "connected", "coupled", "engage", "mount", "bond", "secure", and their derivatives. Finally, degree terms such as "substantially", "approximately" and "about" as used herein mean an acceptable quantity of deviation from a true value of a quantity that does not result in a change in the end result that is not material.

[0271] Unless otherwise defined, all 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 that embodiment is inherently incompatible with the other embodiment.

[0272] The application has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of illustration and description, and are not intended to limit the application to the scope of the described embodiments. Furthermore, those skilled in the art can understand that the application is not limited to the above embodiments, and more various modifications and changes can be made according to the teachings of the application, which all fall within the scope of the application claimed.

Claims

1. An electromagnetic heating module for heating the cooking container of an electromagnetic heating cooking appliance, characterized in that, include: At least one first coil, the first coil being used to generate a first alternating magnetic field after being energized, the winding center of the first coil being offset from the central axis of the electromagnetic heating module; and The second coil is used to generate a second alternating magnetic field after being energized, and the winding center of the second coil is located on the central axis of the electromagnetic heating module.

2. The electromagnetic heating module according to claim 1, characterized in that, At least a portion of the second coil is located between the first coil and the central axis of the electromagnetic heating module.

3. The electromagnetic heating module according to claim 2, characterized in that, The entire second coil is located between the first coil and the central axis of the electromagnetic heating module.

4. The electromagnetic heating module according to claim 1, characterized in that, The first coil is made by winding enameled wire in a first direction, and the second coil is made by winding enameled wire in a second direction, wherein the first direction is opposite to the second direction; and / or The ratio of the length of the enameled wire portion of the second coil used to form the inductance to the length of the enameled wire portion of the single first coil used to form the inductance is 1:1 to 1:

4.

5. The electromagnetic heating module according to claim 1, characterized in that, The first coil and the second coil are made of the same enameled wire wound together; or The first coil and the second coil are made of different enameled wires wound together.

6. The electromagnetic heating module according to claim 1, characterized in that, The electromagnetic heating module includes a plurality of first coils, all of which are equally spaced along the circumferential direction of the electromagnetic heating module.

7. The electromagnetic heating module according to any one of claims 1 to 6, characterized in that, It also includes a coil disk, the central axis of which is the central axis of the electromagnetic heating module, and the first coil and the second coil are disposed on the coil disk.

8. The electromagnetic heating module according to claim 7, characterized in that, The first coil and the second coil are disposed on the same side of the coil disk; and / or The coil disk is provided with a positioning groove, and the first coil is disposed in the positioning groove.

9. The electromagnetic heating module according to claim 7, characterized in that, A cylindrical portion extending along the axial direction of the coil disk is disposed approximately at the center of the coil disk, and the second coil is disposed on the outer periphery of the cylindrical portion of the coil disk. The electromagnetic heating module also includes a temperature sensor, which is disposed approximately coaxially with the coil disk within the cylindrical portion of the coil disk. The electromagnetic heating module is configured such that the coil and the temperature sensor can rotate relative to each other around a coaxial axis.

10. The electromagnetic heating module according to claim 9, characterized in that, The electromagnetic heating module further includes a mounting bracket for detachable connection to the electromagnetic heating cooking appliance. The mounting bracket has a cylindrical portion protruding toward the coil disc along the axial direction of the coil disc. The cylindrical portion of the coil disc protrudes toward the mounting bracket along the axial direction of the coil disc. The cylindrical portion of the coil disc is adapted to and rotatably connected to the cylindrical portion of the mounting bracket, such that the cylindrical portion of the coil disc is rotatable relative to the cylindrical portion of the mounting bracket around the central axis of the coil disc.

11. The electromagnetic heating module according to claim 10, characterized in that, One of the mounting frame cylindrical portion and the coil disc cylindrical portion is located at least partially in the other of the mounting frame cylindrical portion and the coil disc cylindrical portion, and the coil disc cylindrical portion and the mounting frame cylindrical portion are connected by a rotary joint structure, wherein the axis of the rotary joint structure coincides with the central axis of the coil disc.

12. The electromagnetic heating module according to claim 11, characterized in that, The slewing joint structure is configured as a rolling slewing joint structure or a sliding slewing joint structure; and / or The rotary joint structure is made of non-metallic materials.

13. The electromagnetic heating module according to claim 11, characterized in that, The outer peripheral surface of one of the mounting frame cylindrical portion and the coil disc cylindrical portion is provided with a first surface extending radially, and the inner peripheral surface of the other of the mounting frame cylindrical portion and the coil disc cylindrical portion is provided with a second surface extending radially, and the rotary joint structure is located between the first surface and the second surface.

14. The electromagnetic heating module according to claim 10, characterized in that, The inner circumferential surface of the cylindrical part of the mounting frame is provided with a third surface extending in the radial direction. The electromagnetic heating module also includes a spring, which is located between the temperature sensor and the third surface. The third surface is connected to a through hole for the cable of the temperature sensor to pass through.

15. The electromagnetic heating module according to claim 10, characterized in that, It also includes a blocking structure, the blocking structure comprising: The blocking part is constructed as a blocking ring with its radial direction being the radial direction of the coil disk. The outer diameter of the blocking ring is larger than the inner diameter of the cylindrical part of the coil disk, and the inner diameter of the blocking ring is smaller than the maximum outer diameter of the temperature sensor; and The connecting part has one end connected to the radial middle part of the blocking ring, the connecting part extends into the cylindrical part of the coil disc along the axial direction of the coil disc, and the other end of the connecting part is connected to the mounting bracket.

16. The electromagnetic heating module according to claim 15, characterized in that, The mounting bracket cylindrical part is located in the coil disc cylindrical part, and the connecting part is cylindrical in shape and is screwed or snapped into the mounting bracket cylindrical part.

17. The electromagnetic heating module according to claim 10, characterized in that, It also includes a retaining ring, the retaining ring comprising: An annular wall, extending axially along the coil disk and located on the outer periphery of the coil disk, is connected to the mounting bracket; and An annular baffle extends around the inner circumferential surface of the annular wall and is located on the side of the coil disk facing away from the mounting bracket. In the projection of the electromagnetic heating module along the axial direction of the coil disk, the annular baffle coincides with the outer circumferential edge of the coil disk around the circumferential direction.

18. The electromagnetic heating module according to claim 17, characterized in that, It also includes a plurality of rollers, which are spaced apart along the circumferential direction of the coil disk in the annular wall and / or the mounting bracket, and the rollers are used to contact the coil disk in the axial and / or radial direction of the coil disk.

19. The electromagnetic heating module according to claim 18, characterized in that, The axial direction of the roller is the same as that of the coil disk, and the outer peripheral edge of the coil disk is provided with a groove for accommodating the roller.

20. The electromagnetic heating module according to claim 19, characterized in that, The annular wall is detachably connected to the mounting bracket. One end of the roller's shaft is disposed on the annular wall, and the other end of the roller's shaft is disposed on the mounting bracket.

21. The electromagnetic heating module according to claim 10, characterized in that, The first coil and the second coil are formed by winding the same enameled wire, and the mounting bracket is provided with an opening for the enameled wire or its connecting cable to pass through.

22. The electromagnetic heating module according to claim 21, characterized in that, The mounting bracket has a wire groove on the side facing away from the coil disc for accommodating the enameled wire or its connecting cable; and / or A wire clip is provided on the side of the mounting bracket facing away from the coil disc for limiting the enameled wire or its connecting cable.

23. The electromagnetic heating module according to claim 9, characterized in that, A rotary joint structure is provided between the inner circumferential surface of the cylindrical portion of the coil disk and the outer shell of the temperature sensor, and the central axis of the rotary joint structure is the central axis of the coil disk.

24. The electromagnetic heating module according to claim 23, characterized in that, The temperature sensor has a clutch at one end that contacts the cooking container. The clutch is detachably connected to the surface of the cooking container. The electromagnetic heating module is configured such that the clutch and the temperature sensor maintain a constant relative position. And / or The temperature sensor is configured such that the housing of the temperature sensor and the cable of the temperature sensor can rotate relative to each other around the central axis of the temperature sensor.

25. The electromagnetic heating module according to claim 7, characterized in that, The first coil and the second coil are disposed on the side of the coil disc facing away from the cooking container; and / or The axial cross-section of the coil disk is C-shaped.

26. The electromagnetic heating module according to claim 7, characterized in that, The electromagnetic heating module further includes at least one winding frame, which is arranged corresponding to the first coil. The first coil is disposed on the winding frame, and the winding frame is disposed on the coil disc.

27. The electromagnetic heating module according to claim 26, characterized in that, The winding frame is also equipped with at least one magnetic conductor.

28. The electromagnetic heating module according to claim 9, characterized in that, Also includes: A driving device for providing a driving force for the relative rotation between the coil disk and the temperature sensor; and A transmission device that connects the drive device and the coil disk to one of the temperature sensors.

29. The electromagnetic heating module according to claim 28, characterized in that, The driving device includes a motor; The transmission device includes: The first gear is coaxially connected to the coil disk or the temperature sensor, and The second gear is coaxially connected to the output shaft of the motor and meshes with the first gear.

30. The electromagnetic heating module according to claim 29, characterized in that, The first gear and the second gear are non-metallic gears; and / or The first gear and / or the second gear are configured with weight-reducing holes.

31. The electromagnetic heating module according to claim 29, characterized in that, The ratio of the number of teeth of the second gear to the number of teeth of the first gear is any one of 1:1, 1:2, 1:3 and 1:

4.

32. The electromagnetic heating module according to claim 29, characterized in that, It also includes a magnetic shield that covers the motor to isolate electromagnetic interference between the motor and the coil.

33. An electromagnetic heating cooking appliance, characterized in that, include: The electromagnetic heating module according to any one of claims 1 to 32; and A cooking container, comprising a ferromagnetic material, is positioned substantially coaxially with the electromagnetic heating module within the magnetically inductive region of the electromagnetic heating module. The electromagnetic heating cooking container is configured such that at least a portion of the electromagnetic heating module and the cooking container are rotatable relative to each other about a coaxial axis, so that the alternating magnetic field of the first coil and the cooking container are rotatable relative to each other about the coaxial axis.

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