Electromagnetic heating device and electric cooker

Abstract

The invention discloses an electromagnetic heating device and an electric cooker, the electromagnetic heating device comprises a coil assembly and a magnetic strip assembly, the coil assembly comprises a first coil part and a second coil part, and the second coil part is arranged in the circumferential direction of the first coil part and is connected to the first coil part; the magnetic strip assembly comprises magnetic strips, a first sub-frame and a second sub-frame, the first sub-frame and the second sub-frame are both provided with the magnetic strips, the first sub-frame is connected to the first coil part, and the second sub-frame is connected to the second coil part; the first sub-frame can move relative to the second sub-frame so as to change the relative position of the first sub-frame and the second sub-frame, so that the first sub-frame is matched with the first coil part, and the second sub-frame is matched with the second coil part. The relative positions of the first sub-frame and the second sub-frame can be adjusted according to the sizes of the first coil part and the second coil part, so that the coil assembly is suitable for coil assemblies of various sizes, the number of molds for manufacturing the first sub-frame and the second sub-frame is reduced, and the machining cost is reduced.

Description

Technical Field

[0001] This application belongs to the field of rice cooker technology, specifically relating to an electromagnetic heating device and a rice cooker. Background Technology

[0002] An electric rice cooker is a common kitchen appliance. Rice cookers that use electromagnetic induction heating typically include an electromagnetic heating device, which comprises a winding reel, a coil, and a magnetic strip. The upper opening of the winding reel is used to embed the inner pot. The coil is wound around the outside of the reel, and a high-frequency current is passed through the coil to generate an alternating magnetic field, which induces eddy currents in the inner pot, thus heating it. The magnetic strip is generally mounted on the bottom and sides of the winding reel via a magnetic strip holder. The magnetic strip holder has an obtuse angle structure to fit the shape of the winding reel. By using magnetic strips, the magnetic field lines can be concentrated, increasing the electromagnetic induction intensity and improving the heating effect.

[0003] In related technologies, the diameter of the winding reel in rice cookers varies depending on the diameter, resulting in different sizes of magnetic strip holders installed on the reel. This allows for the installation of magnetic strips of different sizes according to the diameter of the reel. However, existing magnetic strip holders cannot accommodate multiple sizes of winding reels, necessitating the fabrication of magnetic strip holders of various sizes. Each type of magnetic strip holder requires a corresponding mold for processing, leading to high manufacturing costs. Summary of the Invention

[0004] This application aims to provide an electromagnetic heating device and a rice cooker that can solve the problem that existing magnetic strip holders cannot be adapted to winding reels of various sizes.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application provide an electromagnetic heating device, including a coil assembly and a magnetic strip assembly. The coil assembly includes a first coil portion and a second coil portion, wherein the second coil portion is arranged circumferentially around the first coil portion and connected to the first coil portion. The magnetic strip assembly includes a magnetic strip, a first sub-frame, and a second sub-frame. The magnetic strip is mounted on both the first sub-frame and the second sub-frame. The first sub-frame is connected to the first coil portion, and the second sub-frame is connected to the second coil portion. The first subframe is capable of relative movement with the second subframe to change the relative positions of the first subframe and the second subframe, so that the first subframe matches the first coil section and the second subframe matches the second coil section.

[0006] Optionally, the magnetic strip assembly further includes a connector that connects the first sub-frame and the second sub-frame, wherein the first sub-frame is movable relative to the connector, and / or the second sub-frame is movable relative to the connector to change the relative position of the first sub-frame and the second sub-frame.

[0007] Optionally, the connector includes a main body and an elastic arm, the elastic arm being connected to the main body, and the elastic arm having a first snap-fit ​​portion; Both the first sub-frame and the second sub-frame are provided with a sliding groove. The groove wall is provided with a plurality of second locking parts arranged at intervals. The main body is slidably connected to the sliding groove and is locked with any one of the second locking parts through the first locking part.

[0008] Optionally, the first locking part is a locking platform provided on the elastic arm, and the second locking part is a locking groove provided on the groove wall of the slide.

[0009] Optionally, the card holder has a first abutting surface, and the card slot has a second abutting surface, with the first abutting surface abutting against the second abutting surface.

[0010] Optionally, the card slot is provided with a first guide surface, which is inclined relative to the first abutment surface, and the card groove is provided with a second guide surface, which is inclined relative to the second abutment surface, and the second guide surface guides and cooperates with the first guide surface.

[0011] Optionally, the elastic arm is provided with an operating part, and both the first sub-frame and the second sub-frame are provided with operating openings. The operating openings are connected to the slide groove, and the operating part is exposed through the operating openings.

[0012] Optionally, two elastic arms are provided, with the two elastic arms spaced apart at both ends of the main body.

[0013] Optionally, the connector includes a first connector and a second connector, wherein the first connector is connected to the first sub-frame and the second connector is connected to the second sub-frame; The extension direction of the first connector forms an angle with the extension direction of the second connector, and the first connector and the second connector are rotatably connected to change the size of the angle.

[0014] Optionally, the first connector is provided with a rotating shaft, and the second connector is provided with a receiving sleeve, wherein the rotating shaft is rotatably connected to the receiving sleeve.

[0015] Optionally, the outer peripheral wall of the receiving sleeve is provided with an installation opening for installing the rotating shaft; The rotating shaft is provided with a limiting protrusion, and the receiving sleeve is provided with a limiting notch. The limiting protrusion and the limiting notch cooperate to prevent the rotating shaft from separating from the receiving sleeve along the axial direction.

[0016] Secondly, embodiments of this application provide a rice cooker that includes the electromagnetic heating device described in any of the above embodiments.

[0017] In this embodiment, a first subframe is connected to the first coil section to achieve matching between the first subframe and the first coil section. The magnetic strip on the first subframe can act on the first coil section. Similarly, a second subframe is connected to the second coil section to achieve matching between the second subframe and the second coil section. The magnetic strip on the second subframe can act on the second coil section. By allowing the first subframe to move relative to the second subframe, the relative positions of the first and second subframes can be changed (either as a straight line distance, an angle, or a combination of both). This, in turn, changes the relative positions of the magnetic strips on the first subframe and the first coil section, as well as the relative positions of the magnetic strips on the second subframe and the second coil section. Therefore, the relative positions of the first and second subframes can be adjusted according to the dimensions of the first and second coil sections, making it suitable for coil assemblies of various sizes, reducing the number of molds required to manufacture the first and second subframes, and lowering processing costs.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a perspective view of the installation of the magnetic strip assembly and the coil assembly according to an embodiment of this application; Figure 2 This is a schematic diagram of the installation of the magnetic stripe assembly and the coil assembly according to an embodiment of this application; Figure 3 This is a front view of a magnetic stripe assembly according to an embodiment of this application; Figure 4 A perspective view of a magnetic stripe assembly according to an embodiment of this application; Figure 5 for Figure 4 A magnified view of a section at point A in the middle; Figure 6 This is a left view of the magnetic stripe assembly according to an embodiment of this application; Figure 7 This is a cross-sectional view of a magnetic stripe assembly according to an embodiment of this application; Figure 8 for Figure 7 A magnified view of a section at point B in the middle; Figure 9 This is a front view of the first connector according to an embodiment of this application; Figure 10 This is a front view of the second connector according to an embodiment of this application; Figure 11 This is a left view of the second connector according to an embodiment of this application.

[0020] Figure label: 10. Coil assembly; 11. First coil section; 12. Second coil section; 20. Magnetic strip assembly; 25. Magnetic strip; 30. First subframe; 31. Slide groove; 32. Second snap-fit ​​section; 321. Second abutment surface; 322. Second guide surface; 33. Operating opening; 40. Second subframe; 50. Connector; 50a. First connector; 50b. Second connector; 51. Elastic arm; 52. First snap-fit ​​section; 521. First abutment surface; 522. First guide surface; 53. Operating section; 54. Rotating shaft; 541. Limiting protrusion; 55. Receiving sleeve; 551. Mounting opening; 552. Limiting notch; 56. Main body. Detailed Implementation

[0021] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] As a widely used kitchen appliance, the evolution of the heating method in rice cookers directly impacts energy efficiency, temperature control accuracy, and user experience. Traditional rice cookers mostly use bottom resistance wire heating, which suffers from problems such as high thermal inertia, uneven temperature distribution, and low energy efficiency. With the maturity of power electronics technology and electromagnetic induction principles, electromagnetic heating technology has been introduced into the rice cooker field, significantly improving heating efficiency and temperature control performance.

[0026] The core of an electromagnetic heating rice cooker lies in its electromagnetic heating device. This device typically includes a winding reel (or coil), an excitation coil, and a magnetic strip assembly. The winding reel generally has an upward-opening groove or platform to support the inner pot. The excitation coil (usually wound with Litz wire) is laid in a specific area on the bottom or circumferential sidewall of the winding reel. When high-frequency alternating current (usually generated by power switching devices such as IGBTs) is passed into the coil, a high-frequency alternating magnetic field is generated. This magnetic field penetrates the non-magnetic winding reel (usually made of ceramic, microcrystalline glass, or high-temperature resistant plastic) and acts on the bottom and sidewalls of the metal inner pot, inducing eddy currents within it. These eddy currents generate Joule heat in the resistance of the pot, thus achieving direct heating of the pot. This method has high heat conversion efficiency, fast response speed, and allows for precise power and temperature control.

[0027] To improve magnetic field utilization, reduce magnetic leakage, enhance heating uniformity, and prevent electromagnetic interference to surrounding appliances, a magnetic strip assembly is typically placed on the back of the coil (i.e., the non-cookware contact surface). The magnetic strip is usually made of high-permeability, low-loss ferrite material, and its main functions include: 1. Magnetic circuit guidance: concentrating and guiding magnetic field lines to pass more directly through the cookware, reducing magnetic leakage, and thus improving heating efficiency and power density; 2. Shielding: weakening the electromagnetic field scattered downwards and around the rice cooker, reducing electromagnetic radiation (EMI) and meeting safety regulations; 3. Support and insulation: the magnetic strip is usually mounted on a magnetic strip holder (or magnetic strip tray), which serves to fix the coil, support the magnetic strip, provide electrical insulation, and act as a heat dissipation channel.

[0028] In related technologies, the winding coil of a common electromagnetic heating rice cooker is approximately pot-shaped to accommodate the inner pot. The winding coil typically includes a circular disc (roughly corresponding to the central bottom plane of the heating area) and a cylindrical disc (roughly corresponding to the circumferential sidewalls of the heating area). Correspondingly, to match the three-dimensional shape of the winding coil, the magnetic strip assembly is also designed with a similar obtuse angle or stepped structure, including a bottom plate magnetic strip holder corresponding to the bottom area and a side plate magnetic strip holder corresponding to the sidewall area, along with magnetic strips mounted on the bottom plate and side plate magnetic strip holders.

[0029] Currently, magnetic strip holders are mainly divided into one-piece molded magnetic strip holders and split-connection magnetic strip holders. The one-piece molded magnetic strip holder is made through a one-piece molding process to form a fixed structure. The split-connection magnetic strip holder consists of two independent parts, which are fixedly connected by fasteners, buckles or welding, and the connection also forms a fixed structure.

[0030] However, rice cookers come in various inner pot diameters (such as 3L, 4L, 5L, etc.) to meet the needs of different families. Different inner pot diameters require different diameter winding coils to ensure good coupling between the heating area and the bottom of the pot. This necessitates various sizes of magnetic strip holders to match the winding coils. However, neither of the two types of magnetic strip holders mentioned above can fit the various winding coil sizes well, leading to the need to manufacture magnetic strip holders of different sizes. Each size of magnetic strip holder requires a corresponding mold for processing, resulting in high manufacturing costs.

[0031] Based on this, this application proposes an electromagnetic heating device and a rice cooker to solve some or all of the above-mentioned technical problems.

[0032] The electromagnetic heating device and rice cooker provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0033] like Figure 1 and Figure 2As shown, an electromagnetic heating device according to some embodiments of this application includes a coil assembly 10 and a magnetic strip assembly 20. The coil assembly 10 includes a first coil portion 11 and a second coil portion 12. The second coil portion 12 is arranged circumferentially around the first coil portion 11 and connected to the first coil portion 11. The magnetic strip assembly 20 includes a magnetic strip 25, a first sub-frame 30 and a second sub-frame 40. Both the first sub-frame 30 and the second sub-frame 40 are equipped with magnetic strips 25. The first sub-frame 30 is connected to the first coil portion 11, and the second sub-frame 40 is connected to the second coil portion 12. The first sub-frame 30 is capable of relative movement with the second sub-frame 40 to change the relative position of the first sub-frame 30 and the second sub-frame 40 so that the first sub-frame 30 matches the first coil portion 11 and the second sub-frame 40 matches the second coil portion 12.

[0034] In this embodiment, by setting a first subframe 30 connected to the first coil section 11, the first subframe 30 and the first coil section 11 are matched, and the magnetic strip 25 on the first subframe 30 can act on the first coil section 11. By setting a second subframe 40 connected to the second coil section 12, the second subframe 40 and the second coil section 12 are matched, and the magnetic strip 25 on the second subframe 40 can act on the second coil section 12. By setting the first subframe 30 to be able to move relative to the second subframe 40, the relative positions of the first subframe 30 and the second subframe 40 can be changed (which can be a straight-line distance, an angle, or a combination of both). This allows the relative positions of the magnetic strip 25 on the first subframe 30 and the first coil portion 11, as well as the relative positions of the magnetic strip 25 on the second subframe 40 and the second coil portion 12. In this way, the relative positions of the first subframe 30 and the second subframe 40 can be adjusted according to the dimensions of the first coil portion 11 and the second coil portion 12, thereby making it suitable for coil assemblies 10 of various sizes, reducing the number of molds required to manufacture the first subframe 30 and the second subframe 40, and lowering processing costs.

[0035] Specifically, such as Figure 1 As shown, the coil assembly 10 is the part that generates an alternating magnetic field. The first coil section 11 is approximately disk-shaped, and the second coil section 12 is arranged around the circumference of the first coil section 11, approximately forming a cylindrical shape with one end larger than the other. The small end of the second coil section 12 is connected to the circumferential edge of the first coil section 11, thereby forming the entire coil assembly 10.

[0036] For ease of description, taking the direction from the small end of the second coil section 12 to the large end of the second coil section 12 as upward, it can be considered that the second coil section 12 is connected to the upper side of the first coil section 11, and the directions such as down, left, right, front and back are determined based on this.

[0037] Understandably, the first coil section 11 includes a first winding disc and a first conductor. Multiple winding protrusions are formed on the first winding disc, and winding grooves are formed between adjacent winding protrusions. The first conductor is wound in the winding grooves to form a coil structure. Similarly, the second coil section 12 includes a second winding disc and a second conductor.

[0038] The winding protrusions can be spaced out circumferentially to form a gap area. The gap area can accommodate the bending of the first conductor and facilitate the winding of the first conductor.

[0039] The first winding reel of the first coil section 11 and the second winding reel of the second coil section 12 are connected to achieve connection between the first coil section 11 and the second coil section 12.

[0040] In some embodiments, the first winding disc of the first coil portion 11 and the second winding disc of the second coil portion 12 can be integrally formed, eliminating the need for subsequent installation, reducing assembly steps, and also improving the connection strength between the first winding disc of the first coil portion 11 and the second winding disc of the second coil portion 12.

[0041] In other embodiments, the first winding disc of the first coil section 11 and the second winding disc of the second coil section 12 can be separate connecting structures, which can be manufactured separately to reduce the manufacturing difficulty.

[0042] like Figure 1 and Figure 2 As shown, the magnetic strip assembly 20 includes a magnetic strip 25, a first sub-frame 30 and a second sub-frame 40, and both the first sub-frame 30 and the second sub-frame 40 are equipped with magnetic strips 25.

[0043] The magnetic strip 25 is typically made of a high-permeability, low-loss ferrite material, which can bind and guide magnetic field lines, reduce magnetic leakage, and thus improve heating efficiency and power density.

[0044] In some embodiments, the first sub-frame 30 and the second sub-frame 40 may be made of the same material, for example, both may be PET plastic.

[0045] In other embodiments, the materials used to manufacture the first subframe 30 and the second subframe 40 may be different, and can be flexibly set according to the actual situation. This application does not limit the specific materials used in the embodiments.

[0046] The first sub-frame 30 is connected to the first coil section 11, so that the magnetic strip 25 on the first sub-frame 30 can change the magnetic field of the first coil section 11, thereby improving the heating effect of the first coil section 11.

[0047] Specifically, such as Figure 2As shown, the first subframe 30 is connected to the lower side of the first coil section 11 and is arranged radially along the first coil section 11. The magnetic strip 25 is connected to the first subframe 30 or to the side of the first subframe 30 facing the first coil section 11. The magnetic strip 25 on the first subframe 30 is also arranged radially along the first coil section 11. A protrusion may be provided on the lower side wall of the first coil section 11, and a threaded hole may be provided on the protrusion. The first subframe 30 can be installed by bolt connection, which is simple in structure and easy to install.

[0048] In some embodiments, the first subframe 30 may be made of high-temperature resistant insulating engineering plastics (such as PET, PPS, PA66+GF, etc.) by injection molding.

[0049] Similarly, the second sub-frame 40 is connected to the second coil section 12, so that the magnetic strip 25 on the second sub-frame 40 can change the magnetic field of the second coil section 12, thereby improving the heating effect of the second coil section 12.

[0050] Specifically, such as Figure 2 As shown, the second subframe 40 is connected to the outside of the second coil section 12 and is arranged along the height direction of the second coil section 12. The magnetic strip 25 is connected to the second subframe 40 or to the side of the second subframe 40 facing the second coil section 12. The magnetic strip 25 on the second subframe 40 is also arranged along the height direction of the second coil section 12. A protrusion may be provided on the outer wall of the second coil section 12, and a threaded hole may be provided on the protrusion. The second subframe 40 can be installed by bolt connection, which is simple in structure and easy to install.

[0051] In some embodiments, the second subframe 40 may also be made of high-temperature resistant insulating engineering plastics (such as PET, PPS, PA66+GF, etc.) by injection molding.

[0052] Understandably, a coil assembly 10 typically has multiple magnetic stripe assemblies 20 mounted on it, and these magnetic stripe assemblies 20 are arranged at intervals around the circumference of the first coil section 11. For example, there are six magnetic stripe assemblies 20, which are evenly arranged around the circumference of the first coil section 11, with adjacent magnetic stripe assemblies 20 spaced 60 degrees apart.

[0053] The first subframe 30 can move relative to the second subframe 40, changing the relative positions of the first subframe 30 and the second subframe 40, so that the relative position of the magnetic strip 25 on the first subframe 30 and the first coil part 11 can be changed, and the relative position of the magnetic strip 25 on the second subframe 40 and the second coil part 12 can be changed.

[0054] The change in "relative position" can include, but is not limited to, the following forms and combinations thereof: In a first possible implementation, the first subframe 30 can move relative to the second subframe 40. For example, the first subframe 30 can move radially along the first coil portion 11, which can change the relative position of the magnetic strip 25 on the first subframe 30 and the first coil portion 11. Alternatively, the first subframe 30 can be fitted with magnetic strips 25 of other lengths to match the diameter of the first coil portion 11.

[0055] In a second possible implementation, the first subframe 30 can move relative to the second subframe 40. For example, the second subframe 40 can move along the height direction of the second coil section 12, which can change the relative position of the magnetic strip 25 on the second subframe 40 and the second coil section 12. Alternatively, the second subframe 40 can be equipped with magnetic strips 25 of other lengths to match the height of the second coil section 12.

[0056] In a third possible implementation, the first subframe 30 can rotate relative to the second subframe 40, changing the relative angle between the first subframe 30 and the second subframe 40 to match the angle of the coil assembly 10 formed by the first coil section 11 and the second coil section 12.

[0057] It is understandable that the aforementioned three implementation methods can be combined to match the specific shapes of the first coil section 11 and the second coil section 12.

[0058] In summary, the first subframe 30 of this application embodiment can move relative to the second subframe 40 and can match the coil assembly 10 formed by the first coil section 11 and the second coil section 12.

[0059] Through the aforementioned adjustable design, the first sub-frame 30 and the second sub-frame 40 in the same set of magnetic strip assembly 20 do not need to change their basic dimensions. They can be adapted to various coil assemblies 10 of different specifications in a series simply by adjusting their internal relative positions. In this way, during product series development, the first sub-frame 30 and the second sub-frame 40 can be designed and molded as "universal parts" or "platform parts," which greatly reduces the number of new molds required for the first sub-frame 30 and the second sub-frame 40 due to minor adjustments in the dimensions of the coil assembly 10. This reduces processing costs, mold investment, and material management difficulties from the source.

[0060] Optionally, such as Figures 3 to 8 As shown, the magnetic strip assembly 20 also includes a connector 50, which connects a first sub-frame 30 and a second sub-frame 40. The first sub-frame 30 is movable relative to the connector 50, and / or the second sub-frame 40 is movable relative to the connector 50 to change the relative position of the first sub-frame 30 and the second sub-frame 40.

[0061] In this embodiment, the connection between the first subframe 30 and the second subframe 40 is achieved by setting a connector 50. By setting the first subframe 30 and / or the second subframe 40 to be movable relative to the connector 50, the relative positions of the first subframe 30 and the second subframe 40 can be changed. In this way, the connection structure of the first subframe 30 and the second subframe 40 is realized in the form of the connector 50, which simplifies the structure of the first subframe 30 and the second subframe 40, reduces the complexity of the first subframe 30 and the second subframe 40, and reduces the manufacturing difficulty of the first subframe 30 and the second subframe 40.

[0062] In addition, the structural strength of the connector 50 can be designed to be higher, so that the connector 50 can withstand the force during the movement process, thereby improving the mechanical life and stability of the entire magnetic strip assembly 20.

[0063] In some embodiments, by providing the connector 50 to simplify the structure of the first subframe 30 and the second subframe 40, the structure of the first subframe 30 and the second subframe 40 can be kept basically consistent.

[0064] Specifically, such as Figure 4 As shown, the first sub-frame 30 has a cuboid structure and a mounting groove is provided inside it. The mounting groove has an opening at one end along the length direction X of the first sub-frame 30, allowing the magnetic strip 25 to be inserted into the mounting groove through the opening. Alternatively, adhesive can be applied to the magnetic strip 25 to bond it to the wall of the mounting groove, thus fixing the magnetic strip 25 to the first sub-frame 30.

[0065] Similarly, the second subframe 40 can also be a cuboid structure, and can be set with reference to the first subframe 30. This application embodiment will not be described in detail.

[0066] Optionally, such as Figure 9 , Figure 10 and Figure 11 As shown, the connector 50 includes a main body 56 and an elastic arm 51. The elastic arm 51 is connected to the main body 56 and is provided with a first snap-fit ​​part 52. The first sub-frame 30 and the second sub-frame 40 are both provided with a sliding groove 31. The groove wall of the sliding groove 31 is provided with a plurality of second snap-fit ​​parts 32 arranged at intervals. The main body 56 is slidably connected to the sliding groove 31 and snaps with any one of the second snap-fit ​​parts 32 through the first snap-fit ​​part 52.

[0067] In this embodiment, by slidably connecting the main body 56 to the slide groove 31, the first sub-frame 30 and the second sub-frame 40 can move relative to the connecting member 50, thus changing their relative positions. By providing a first elastic arm 51 and a first engaging portion 52 on the main body 56, and multiple second engaging portions 32 on the wall of the slide groove 31, after the main body 56 slides into position with the first sub-frame 30 (or the second sub-frame 40), the first engaging portion 52 on the first elastic arm 51 can engage with the second engaging portions 32. This achieves relative fixation between the main body 56 and the first sub-frame 30 (or the second sub-frame 40), ensuring that their positions remain unchanged without external force. The sliding and engaging structure is simple, easy to manufacture, and convenient to operate.

[0068] Specifically, the slide groove 31 extends along the length direction X of the first sub-frame 30, and the main body 56 slides along the length direction X of the first sub-frame 30, allowing the second sub-frame 40 to move closer to or further away from the first sub-frame 30 along the length direction X of the first sub-frame 30 under the action of the connector 50. The elastic arm 51 is a cantilever beam structure with a certain degree of elasticity, providing elastic deformation capability. Multiple second locking parts 32 are arranged along the length direction X of the first sub-frame 30, and can be arranged at equal intervals or unequal intervals as needed, forming multiple preset, discrete locking positioning points. The first locking part 52 can be locked onto one of the second locking parts 32.

[0069] When adjustment is required, force is applied to the connector 50 or the first subframe 30 to overcome the elastic force of the elastic arm 51, causing the first locking part 52 to disengage from the currently located second locking part 32; then the main body 56 slides along the slide groove 31; when it slides to the target position, the applied force is released, the elastic arm 51 rebounds, driving the first locking part 52 to fall into the corresponding other second locking part 32, thus achieving locking and fixing.

[0070] It should be noted that the sliding groove 31 and the aforementioned mounting groove are spaced apart along the thickness direction Z of the first subframe 30, forming two independent groove structures. In this way, the magnetic strip 25 is separated from the main body 56, so that the installation of the magnetic strip 25 and the sliding of the main body 56 do not affect each other.

[0071] In some embodiments, the connector 50 may be made of plastic, which makes it easy for the elastic arm 51 to undergo elastic deformation, and the manufacturing cost is also low.

[0072] Optionally, such as Figure 8 As shown, the first locking part 52 is a locking platform provided on the elastic arm 51, and the second locking part 32 is a locking groove provided on the groove wall of the slide groove 31.

[0073] In this embodiment, the card holder and card slot are designed for secure connection, resulting in a simple structure that is easy to manufacture.

[0074] Specifically, the shape of the card holder can be triangular, hemispherical, trapezoidal, or rectangular, etc., and the shape of the card slot should correspond to the shape of the card holder. The shapes of the card holder and card slot can be flexibly set according to the actual situation, and this application embodiment does not limit them.

[0075] Optionally, such as Figure 8 As shown, the card holder has a first abutting surface 521 and the card slot has a second abutting surface 321, and the first abutting surface 521 abuts against the second abutting surface 321.

[0076] In this embodiment of the application, by setting the first abutting surface 521 to abut the second abutting surface 321, a firm engagement between the card platform and the card slot can be achieved.

[0077] Specifically, the first contact surface 521 and the second contact surface 321 are both perpendicular to the length direction X of the first sub-frame 30, which can effectively prevent the card platform from separating from the card slot after the card is engaged.

[0078] In some embodiments, the distance between the second abutment surfaces 321 of two adjacent card slots along the length direction X of the first sub-frame 30 is the minimum adjustable distance. For example, the distance between the second abutment surfaces 321 of two adjacent card slots along the length direction X of the first sub-frame 30 is 1 mm. The card platform separates from one card slot and then snaps into the adjacent card slot. The minimum adjustable distance of the card platform is 1 mm.

[0079] Optionally, such as Figure 8 As shown, the card slot is provided with a first guide surface 522, which is inclined relative to the first abutment surface 521. The card slot is provided with a second guide surface 322, which is inclined relative to the second abutment surface 321. The second guide surface 322 and the first guide surface 522 are guided and cooperated.

[0080] In this embodiment, by setting the second guide surface 322 to cooperate with the first guide surface 522, the separation process of the card holder and the card slot can be guided. When a thrust along the sliding direction is applied to the main body 56, the card holder can be separated under the guiding cooperation of the second guide surface 322 and the first guide surface 522. In this way, the operator only needs to apply a thrust along the sliding direction to automatically complete the separation of the card holder and the card slot and move it to the bottom of the slot.

[0081] Optionally, such as Figure 7 and Figure 9 As shown, the elastic arm 51 is provided with an operating part 53, and the first sub-frame 30 and the second sub-frame 40 are both provided with operating openings 33. The operating openings 33 are connected to the slide groove 31, and the operating part 53 is exposed in the operating openings 33.

[0082] In this embodiment, by exposing the operating part 53 to the operating opening 33, the user can apply force to the operating part 53 to cause the elastic arm 51 to elastically deform, thereby separating the card table from the card slot. The main body 56 can then slide along the slide groove 31 to achieve position adjustment. The arrangement of the operating part 53 and the operating opening 33 facilitates the elastic deformation of the elastic arm 51, making operation simple and convenient.

[0083] Specifically, such as Figure 9 As shown, the operating part 53 can be a protrusion, a paddle, a textured area, etc., provided on the elastic arm 51, which facilitates pressing or flicking with a finger to apply force. The operating opening 33 can be a through hole provided on the first sub-frame 30.

[0084] It should be noted that when there are multiple operating openings 33, and they are arranged at intervals along the length direction X of the first sub-frame 30, there is a barrier between two adjacent operating openings 33. In this case, the operating part 53 only needs to be exposed outside the operating opening 33 along the width direction Y of the first sub-frame 30. In this way, when the main body 56 slides, the operating part 53 will not collide with the part between two adjacent operating openings 33.

[0085] The assembly and adjustment operations for connector 50 are as follows: 1. Assembly: Insert the main body 56 of the connector 50 into the slide groove 31 of the first sub-frame 30 from the end. During the insertion process, the first guide surface 522 of the locking platform contacts the entrance of the slide groove 31 or the first locking slot, causing the elastic arm 51 to undergo elastic deformation until the locking platform slides into a certain locking slot, resets and locks under the action of elastic force, and completes the initial fixation in one direction.

[0086] 2. Adjustment: Apply a pulling force along the width direction Y of the first sub-frame 30 to the operating part 53 through the operating opening 33, so that the elastic arm 51 undergoes elastic deformation, the clamping table completely disengages from the clamping slot, and then slide the connecting piece 50 to the target position, and release the operating part 53 to clamp.

[0087] In this way, the relative position between the first subframe 30 and the connector 50 can be quickly and reliably adjusted in multiple positions. The connection and adjustment principle between the second subframe 40 and the connector 50 is exactly the same. Thus, by adjusting the engagement positions of the two ends of the connector 50 with the first subframe 30 and the second subframe 40 respectively, continuous or stepped adjustment of the distance between them can be achieved.

[0088] Optionally, such as Figure 9 As shown, there are two elastic arms 51, which are spaced apart at both ends of the main body 56.

[0089] In this embodiment, by providing two elastic arms 51 at both ends of the main body 56, a symmetrical structure is formed. The two locking platforms simultaneously engage with the locking slots on the two side walls of the slide groove 31. This ensures that the connecting member 50 is subjected to more even force, avoiding skewing or jamming caused by single-point force. Furthermore, the two elastic arms 51 can form a redundant design; even if one elastic arm 51 fails due to extreme conditions, the locking platform on the other elastic arm 51 can still achieve engagement, improving engagement reliability.

[0090] Specifically, the slots can be set on two opposite groove walls of the slide 31 along the width direction Y of the first sub-frame 30, and correspondingly, the two elastic arms 51 can be arranged at intervals along the width direction Y of the first sub-frame 30.

[0091] Optionally, such as Figure 4 , Figure 5 and Figure 6 As shown, the connector 50 includes a first connector 50a and a second connector 50b. The first connector 50a is connected to the first sub-frame 30, and the second connector 50b is connected to the second sub-frame 40. The extension direction of the first connector 50a and the extension direction of the second connector 50b form an angle. The first connector 50a and the second connector 50b are rotatably connected to change the size of the angle.

[0092] In this embodiment of the application, by setting the first connector 50a and the second connector 50b to be rotatably connected, the included angle between the first connector 50a and the second connector 50b can be changed. In this way, the relative angle between the first subframe 30 and the second subframe 40 can be changed, thereby matching the situation where the first coil part 11 and the second coil part 12 form different angles, and expanding the applicability of the magnetic strip assembly 20.

[0093] Specifically, the first coil portion 11 and the second coil portion 12 form an obtuse angle, and the included angle between the first connector 50a and the second connector 50b is also an obtuse angle. When the included angle between the first coil portion 11 and the second coil portion 12 changes, matching can be achieved by changing the included angle between the first connector 50a and the second connector 50b.

[0094] In this way, the magnetic strip assembly 20 can not only flexibly match the first coil section 11 with different diameters, but also match the situation where the first coil section 11 and the second coil section 12 form different angles.

[0095] When a new coil assembly 10 needs to be adapted, and the angle between the first coil portion 11 and the second coil portion 12 of the coil assembly 10 changes (e.g., from 100 degrees to 110 degrees), an assembly worker or automated tooling can apply a torque to rotate the first connector 50a relative to the second connector 50b until the angle between them is adjusted to match the angle of the new coil assembly 10 (e.g., the angle between the first connector 50a and the second connector 50b also changes from 100 degrees to 110 degrees). Then, the first subframe 30 is fixed to the first coil portion 11, and the second subframe 40 is fixed to the second coil portion 12.

[0096] By combining the position adjustment of the first connector 50a within the slide groove 31 of the first sub-frame 30 and the position adjustment of the second connector 50b within the slide groove 31 of the second sub-frame 40, the magnetic strip assembly 20 of this embodiment achieves three-dimensional adjustability of distance (radial direction of the first coil portion 11 and height direction of the second coil portion 12) and angle, thus possessing stronger universal adaptability.

[0097] Optionally, such as Figure 5 , Figure 9 and Figure 10 As shown, the first connector 50a is provided with a rotating shaft 54, and the second connector 50b is provided with a receiving sleeve 55. The rotating shaft 54 ​​is rotatably connected to the receiving sleeve 55.

[0098] In this embodiment, the rotational connection is achieved through a rotating shaft 54 ​​and a receiving sleeve 55, which has a simple structure, low frictional resistance, and smooth rotation.

[0099] Specifically, such as Figure 9 As shown, there is a certain gap between the rotating shaft 54 ​​and the main body 56 to accommodate the wall thickness of the receiving sleeve 55.

[0100] Optionally, such as Figure 5 , Figure 10 and Figure 11 As shown, the outer peripheral wall of the receiving sleeve 55 is provided with an installation opening 551 for installing the rotating shaft 54; the rotating shaft 54 ​​is provided with a limiting protrusion 541, and the receiving sleeve 55 is provided with a limiting notch 552. The limiting protrusion 541 and the limiting notch 552 cooperate to prevent the rotating shaft 54 ​​from separating from the receiving sleeve 55 along the axial direction.

[0101] In this embodiment, by providing an installation opening 551, the rotating shaft 54 ​​can be pressed into the receiving sleeve 55 from the position of the installation opening 551, thereby realizing the installation of the rotating shaft 54. In this way, the rotating shaft 54 ​​can be installed radially from the receiving sleeve 55, instead of necessarily axially, simplifying the installation process and improving the ease of installation of the rotating shaft 54. By providing a limiting protrusion 541 on the rotating shaft 54 ​​and a limiting notch 552 on the receiving sleeve 55, the limiting protrusion 541 and the limiting notch 552 cooperate to form an axial limit, which can prevent the rotating shaft 54 ​​from detaching from the receiving sleeve 55 axially, improving the reliability of the rotary connection.

[0102] Specifically, such as Figure 9 and Figure 10 As shown, the limiting protrusion 541 is located in the middle of the rotating shaft 54, and the limiting notch 552 is located in the middle of the receiving sleeve 55, thereby achieving a limiting engagement. The limiting protrusion 541 can be a relatively long protrusion, slightly smaller than the length of the limiting notch 552. Alternatively, there can be two limiting protrusions 541, arranged at intervals, with each of the two limiting protrusions 541 engaging with the two ends of the limiting notch 552 respectively.

[0103] Understandably, the opening size of the mounting opening 551 is smaller than the diameter of the rotating shaft 54. This ensures that the rotating shaft 54 ​​will not detach from the mounting opening 551 after being installed into the receiving sleeve 55, guaranteeing the reliability of the rotational connection. When installing the rotating shaft 54, it is necessary to press the rotating shaft 54 ​​firmly, causing a slight deformation of the receiving sleeve 55, allowing the rotating shaft 54 ​​to pass through the mounting opening 551 and enter the receiving sleeve 55.

[0104] Optionally, embodiments of this application provide a rice cooker that includes the electromagnetic heating device of any of the above embodiments.

[0105] In this embodiment, since the rice cooker includes the electromagnetic heating device of any of the above embodiments, it has the beneficial effects of the electromagnetic heating device. That is, by setting the first sub-frame 30 to be connected to the first coil part 11, the first sub-frame 30 and the first coil part 11 are matched, and the magnetic strip 25 on the first sub-frame 30 can act on the first coil part 11. By setting the second sub-frame 40 to be connected to the second coil part 12, the second sub-frame 40 and the second coil part 12 are matched, and the magnetic strip 25 on the second sub-frame 40 can act on the second coil part 12. By setting the first subframe 30 to be able to move relative to the second subframe 40, the relative positions of the first subframe 30 and the second subframe 40 can be changed (which can be a straight-line distance, an angle, or a combination of both). This allows the relative positions of the magnetic strip 25 on the first subframe 30 and the first coil portion 11, as well as the relative positions of the magnetic strip 25 on the second subframe 40 and the second coil portion 12. In this way, the relative positions of the first subframe 30 and the second subframe 40 can be adjusted according to the dimensions of the first coil portion 11 and the second coil portion 12, thereby making it suitable for coil assemblies 10 of various sizes, reducing the number of molds required to manufacture the first subframe 30 and the second subframe 40, and lowering processing costs.

[0106] Specifically, in addition to the electromagnetic heating device, the rice cooker also includes components such as the outer shell, inner pot, control circuit board, user interface (such as buttons and display screen), and pot lid, which can be referred to the existing technology settings, and will not be described in detail in the embodiments of this application.

[0107] The electromagnetic heating device and rice cooker provided in this application have a reasonable structural design and a reliable adjustment mechanism, making them fully suitable for large-scale industrial production. The materials used (engineering plastics, ferrite cores, metal connectors, etc.) are all commercially available materials, and the processing technology (injection molding, stamping, assembly) is mature.

[0108] When manufacturing rice cookers, especially when producing multiple models of the same series but with different capacities, the following process can be followed: 1. Mass-produce the first subframe 30 and the second subframe 40 of uniform specifications (as general-purpose parts or platform parts).

[0109] 2. Mass-produce uniform first connector 50a and second connector 50b.

[0110] 3. Based on the dimensional parameters (bottom diameter, side wall height, included angle) of the coil assembly 10 of a specific model, pre-adjust each magnetic strip assembly 20 unit on the sub-assembly line or final assembly line: a. Insert the first connector 50a into the slide groove 31 of the first sub-frame 30, slide it to a predetermined slot position corresponding to the bottom radius of the model, and then lock it in place. b. Insert the second connector 50b into the slide groove 31 of the second sub-frame 40, slide it to a predetermined slot position corresponding to the side wall height of the model, and then lock it in place. c. Assemble the rotating shaft 54 ​​of the first connector 50a and the receiving sleeve 55 of the second connector 50b, and rotate them to the angle corresponding to the included angle of the coil assembly 10 of that model.

[0111] 4. Secure the adjusted complete magnetic strip assembly 20 unit to the designated position of the corresponding model coil assembly 10 through the mounting holes on the first sub-frame 30 and the second sub-frame 40 using screws.

[0112] 5. Install the assembled coil assembly 10 and magnetic strip assembly 20 into the rice cooker shell to complete the assembly of the whole machine.

[0113] In this way, with less component diversity, less mold investment, and more flexible production lines, we can quickly respond to market demands and launch rice cooker products of different capacities and specifications without compromising product performance.

[0114] Of course, the electromagnetic heating device of this application is not limited to rice cookers. It can also be applied to other kitchen appliances that use electromagnetic induction heating, such as induction cookers (coil coils for different sizes of cookware), electric pressure cookers, electric slow cookers, electric kettles, etc. Wherever a magnetic strip assembly is needed to optimize the magnetic field and there are multiple size adaptation issues, the design concept of this application can be used as a reference. It is only necessary to adjust the shape and size of the coil assembly 10 and the magnetic strip assembly 20 according to the characteristics of the actual product.

[0115] In summary, the beneficial effects of the embodiments of this application include at least the following: 1. Excellent versatility and adaptability: By allowing the first sub-frame 30 and the second sub-frame 40 in the magnetic strip assembly 20 to move relative to each other (adjusting the distance and / or angle), a set of magnetic strip assemblies 20 can flexibly match a variety of coil assemblies 10 of different specifications within a size range, breaking the inherent "one-to-one" pattern.

[0116] 2. Significant cost reduction: As "general-purpose parts" or "platform parts," the first subframe 30 and the second subframe 40 can have significantly fewer molds. For multiple products in a series, only one or a few sets of molds may be needed, instead of one set for each product, saving substantial costs in mold development, manufacturing, and maintenance.

[0117] 3. Simplified supply chain and warehousing: The reduction in the types of materials reduces procurement complexity, inventory pressure and warehousing costs, and improves the flexibility of production planning.

[0118] 4. Shorten the R&D cycle: When developing new or modified products, there is no need to redesign the magnetic strip 25 mounting structure and wait for new molds. Only the parameters of the existing adjustable magnetic strip assembly 20 need to be adjusted, which speeds up the product launch.

[0119] 5. Improve production and after-sales efficiency: During production line assembly and after-sales maintenance, the number of parts that need to be managed is reduced, the error rate is lowered, and efficiency is improved.

[0120] 6. Reliable structure and easy operation: The adjustment function is achieved through mature mechanical structures such as sliding snap-fit, elastic positioning, and rotary connection, ensuring the stability and reliability of the structure after adjustment. The design of the operating unit 53 makes the adjustment process simple and intuitive, providing a good user experience.

[0121] 7. Maintain excellent heating performance: Through precise position and angle adjustment, it can be ensured that the magnetic strip 25 is always in the optimal position relative to the coil assembly 10, thereby ensuring that the magnetic field guidance and shielding effect are not affected by the generalized design, and maintaining excellent performance of high energy efficiency and low electromagnetic interference.

[0122] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0123] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An electromagnetic heating device, characterized by, The application relates to a coil assembly (10) and a magnetic strip assembly (20), the coil assembly (10) comprising a first coil part (11) and a second coil part (12), the second coil part (12) being arranged around the circumference of the first coil part (11) and connected to the first coil part (10); the magnetic strip assembly (20) comprising a magnetic strip (25), a first sub-frame (30) and a second sub-frame (40), the first sub-frame (30) and the second sub-frame (40) each being provided with the magnetic strip (25), the first sub-frame (30) being connected to the first coil part (11), and the second sub-frame (40) being connected to the second coil part (12); the first sub-frame (30) being capable of relative movement with the second sub-frame (40) to change the relative position of the first sub-frame (30) and the second sub-frame (40) so that the first sub-frame (30) matches the first coil part (11) and the second sub-frame (40) matches the second coil part (12). The magnetic strip assembly (20) further comprises a connecting piece (50) connecting the first sub-frame (30) and the second sub-frame (40), the first sub-frame (30) being capable of relative movement with the connecting piece (50) and / or the second sub-frame (40) being capable of relative movement with the connecting piece (50) to change the relative position of the first sub-frame (30) and the second sub-frame (40). The connecting piece (50) comprises a main body part (56) and an elastic arm (51), the elastic arm (51) being connected to the main body part (56), the elastic arm (51) being provided with a first clamping part (52); The first sub-frame (30) and the second sub-frame (40) are each provided with a sliding groove (31), the groove wall of the sliding groove (31) being provided with a plurality of second clamping parts (32) arranged at intervals, the main body part (56) being slidingly connected to the sliding groove (31) and clamped with any one of the second clamping parts (32) through the first clamping part (52).

2. The electromagnetic heating device of claim 1, wherein, The first clamping part (52) is a clamping table provided on the elastic arm (51), and the second clamping part (32) is a clamping groove provided on the groove wall of the sliding groove (31).

3. The electromagnetic heating device of claim 2, wherein, The clamping table is provided with a first abutting surface (521), and the clamping groove is provided with a second abutting surface (321), the first abutting surface (521) abutting against the second abutting surface (321). The clamping table is provided with a first guide surface (522) which is arranged obliquely relative to the first abutting surface (521), and the clamping groove is provided with a second guide surface (322) which is arranged obliquely relative to the second abutting surface (321), the second guide surface (322) guiding the first guide surface (522).

4. The electromagnetic heating device of claim 3, wherein, ​ 5. The electromagnetic heating device of claim 4, wherein, ​ 6. The electromagnetic heating device of claim 5, wherein, ​ 7. The electromagnetic heating device of claim 3, wherein, The elastic arm (51) is provided with an operation part (53), the first sub-frame (30) and the second sub-frame (40) are both provided with an operation opening (33), the operation opening (33) is communicated with the sliding groove (31), and the operation part (53) is exposed to the operation opening (33).

8. The electromagnetic heating device of claim 3, wherein, The elastic arm (51) is provided with two elastic arms (51) which are arranged at two ends of the main body part (56) in a spaced manner.

9. The electromagnetic heating device according to any one of claims 2-8, characterized in that, The connecting piece (50) comprises a first connecting piece (50a) and a second connecting piece (50b), the first connecting piece (50a) is connected with the first sub-frame (30), and the second connecting piece (50b) is connected with the second sub-frame (40). The extension direction of the first connecting piece (50a) and the extension direction of the second connecting piece (50b) form an included angle, and the first connecting piece (50a) and the second connecting piece (50b) are rotationally connected to change the size of the included angle.

10. The electromagnetic heating device of claim 9, wherein, The first connecting piece (50a) is provided with a rotating shaft (54), the second connecting piece (50b) is provided with a containing sleeve (55), and the rotating shaft (54) is rotationally connected with the containing sleeve (55).

11. The electromagnetic heating device of claim 10, wherein, The outer peripheral wall of the containing sleeve (55) is provided with a mounting opening (551), and the mounting opening (551) is used for mounting the rotating shaft (54). The rotating shaft (54) is provided with a limiting protrusion (541), the containing sleeve (55) is provided with a limiting gap (552), and the limiting protrusion (541) is matched with the limiting gap (552) to prevent the rotating shaft (54) from being separated from the containing sleeve (55) in the axial direction.

12. An electric rice cooker, characterized by comprising: An electromagnetic heating device as claimed in any one of claims 1-11.

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