A heating device and a cooking appliance

Abstract

The utility model relates to kitchen appliance technical field discloses a heating device and cooking utensil, and the heating device includes coil disc, and multiple electromagnetic heating coils are sequentially arranged in the circumference on coil disc, and each electromagnetic heating coil extends from the position close to the center of coil disc to the edge position of coil disc. The end of each electromagnetic heating coil close to the center position of coil disc is inner end part, and the end of each electromagnetic heating coil close to the edge position of coil disc is outer end part, and the size of inner end part is less than the size of outer end part. Among them, the line between the center of inner end part and the center of outer end part does not coincide with the center of coil disc, so that at least there is partial overlapping area from the radial direction of coil disc for two adjacent electromagnetic heating coils. When multiple electromagnetic heating coils work periodically and alternately, the heating area changes alternately, can improve the heat exchange efficiency in the inner container and the heating uniformity, and further improve the cooking effect, improve the food taste.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a heating device and cooking utensil. Background Technology

[0002] Traditional electromagnetic cooking appliances (such as induction cookers and rice cookers) mainly generate a high-frequency alternating electromagnetic field by energizing the internal coil windings. They use the principle of electromagnetic induction to generate eddy currents at the bottom of the metal pot or inner pot, thereby converting electrical energy into heat energy to achieve the heating function.

[0003] However, most existing electromagnetic cooking appliances use a single coil structure, with the coil wound at the bottom of the appliance, resulting in a fixed heating area and insufficient heat convection, which affects the taste and texture of the food.

[0004] To improve heat convection, some electromagnetic cooking appliances are equipped with multiple coils to expand the heating range. However, there is a large gap between the coils, resulting in uneven heating distribution, insufficient heat in some areas, uneven heating of food, and affecting the cooking effect.

[0005] Therefore, there is an urgent need for a heating device and cooking appliance to solve the above problems. Utility Model Content

[0006] Based on the above problems, the purpose of this utility model is to provide a heating device and cooking appliance that can improve heat convection effect, enhance heating uniformity, and improve cooking effect.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, a heating device is provided, including a coil disk on which a plurality of electromagnetic heating coils are arranged sequentially along the circumference, and each electromagnetic heating coil extends from a position near the center of the coil disk toward the edge of the coil disk.

[0009] The end of each electromagnetic heating coil near the center of the coil disk is the inner end, and the end of each electromagnetic heating coil near the edge of the coil disk is the outer end. The size of the inner end is smaller than the size of the outer end.

[0010] The line connecting the center of the inner end and the center of the outer end does not coincide with the center of the coil disk.

[0011] As an optional embodiment of the heating device of this utility model, the line connecting the center of the inner end and the center of the outer end is the center line, and the center lines of the plurality of electromagnetic heating coils are radially distributed with the center of the coil disk as the center.

[0012] As an optional embodiment of the heating device of this utility model, the electromagnetic heating coil has a first side and a second side spaced apart circumferentially along the coil disk, the line connecting the center of the inner end and the center of the outer end is a center line, and the first side and the second side are asymmetrically distributed on both sides of the center line.

[0013] As an optional embodiment of the heating device of this utility model, in two adjacent electromagnetic heating coils, the second side of one electromagnetic heating coil is at least partially parallel to the first side of the other electromagnetic heating coil.

[0014] As an optional embodiment of the heating device of this utility model, the second side includes an arc-shaped segment, which is located near the center of the coil.

[0015] As an optional solution for the heating device of this utility model, the coil disk is provided with coil fixing areas corresponding to the plurality of electromagnetic heating coils one by one, and a winding groove is provided in the coil fixing area, and the electromagnetic heating coil is wound in the winding groove in the corresponding coil fixing area.

[0016] As an optional solution for the heating device of this utility model, multiple turns of first winding ribs are concentrically arranged in the coil fixing area, each turn including at least three first winding ribs, and the three first winding ribs are distributed in a triangular pattern, with the winding groove formed between two adjacent turns of first winding ribs.

[0017] A second winding rib is provided in the area between two adjacent first winding ribs in the same loop, and a second winding rib is provided for each first winding rib.

[0018] As an optional embodiment of the heating device of this utility model, the heating device further includes a control circuit board, and the plurality of electromagnetic heating coils are electrically connected to the control circuit board;

[0019] Multiple electromagnetic heating coils work alternately and periodically in sequence along the circumference; or, multiple sets of electromagnetic heating coils are provided, each set including at least two electromagnetic heating coils, and multiple sets of electromagnetic heating coils work alternately and periodically, with electromagnetic heating coils in the same set working simultaneously.

[0020] As an optional embodiment of the heating device of this utility model, the electromagnetic heating coils in the same group are located on the same diameter line of the coil disk; or, the electromagnetic heating coils in the same group are arranged adjacent to each other in the circumferential direction.

[0021] As an optional embodiment of the heating device of this utility model, the heating device further includes magnets, and multiple sets of magnets are arranged circumferentially on the coil disk, each set including at least two magnets arranged sequentially along the radial direction of the coil disk;

[0022] And / or, the magnet is arranged in the edge region of each of the electromagnetic heating coils.

[0023] Secondly, a cooking utensil is provided, comprising an outer pot body, an inner pot, and a heating device as described above, wherein the heating device is disposed at the bottom outer side of the inner pot, and the inner pot is disposed within the outer pot body.

[0024] The beneficial effects of this utility model are as follows:

[0025] The heating device and cooking appliance provided by this utility model, when the user selects a cooking program, controls multiple electromagnetic heating coils to work alternately and periodically according to the working sequence, cycle, and parameters set in the cooking program. This heats the food in the inner pot, completing the cooking process. Because the inner end of the electromagnetic heating coil is smaller than the outer end, and the line connecting the centers of the inner and outer ends does not coincide with the center of the coil disk, the outer end of one electromagnetic heating coil can be radially adjacent to the inner end of the next electromagnetic heating coil. That is, adjacent electromagnetic heating coils have at least partial overlap when viewed radially from the coil disk. Therefore, when multiple electromagnetic heating coils work alternately and periodically, the heating area changes continuously in both the circumferential and radial directions of the coil disk. This generates both circumferential and radial heat convection within the inner pot, improving heat exchange efficiency and altering the heat field distribution to enhance heating uniformity. This results in more even heating of the food in the inner pot, improving cooking performance and enhancing the taste of the food. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the heating device provided in a specific embodiment of this utility model;

[0028] Figure 2 This is an exploded view of the heating device provided in a specific embodiment of this utility model;

[0029] Figure 3 This is a schematic diagram of the distribution of the electromagnetic heating coil on the coil disk according to a specific embodiment of this utility model;

[0030] Figure 4 This is a top view of the heating device provided in a specific embodiment of this utility model;

[0031] Figure 5 This is a top view of the coil disk provided in a specific embodiment of this utility model;

[0032] Figure 6 This is a first planar schematic diagram of the cooking utensil provided in a specific embodiment of the present utility model;

[0033] Figure 7 This is a cross-sectional view of the cooking utensil provided in a specific embodiment of this utility model;

[0034] Figure 8 This is a circuit connection diagram of the heating device provided in a specific embodiment of this utility model;

[0035] Figure 9 This is a second planar schematic diagram of the cooking utensil provided in a specific embodiment of the present utility model;

[0036] Figure 10 This is a flowchart of a cooking appliance control method provided in a specific embodiment of this utility model.

[0037] In the picture:

[0038] 1. Coil disc; 2. Electromagnetic heating coil; 3. Magnet; 4. Control circuit board;

[0039] 11. Coil fixing area; 12. First winding rib; 13. Second winding rib; 14. Support rib; 15. Winding groove;

[0040] 21. Inner end; 22. Outer end; 23. Centerline; 24. First side; 25. Second side; 251. Arc segment;

[0041] 210, Coil 1; 220, Coil 2; 230, Coil 3; 240, Coil 4; 250, Coil 5; 260, Coil 6;

[0042] 10. Outer pot body; 20. Inner pot. Detailed Implementation

[0043] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Specifically, the terms "first position" and "second position" refer to two different positions.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] like Figures 1 to 6 As shown, this embodiment provides a heating device that can improve heat convection and heating uniformity, thereby enhancing the cooking effect.

[0047] See Figure 1 , Figure 2 and Figure 3 The heating device includes a coil disk 1, on which multiple electromagnetic heating coils 2 are arranged sequentially along the circumference. Each electromagnetic heating coil 2 extends from a position near the center of the coil disk 1 towards its edge. The end of each electromagnetic heating coil 2 near the center of the coil disk 1 is designated as the inner end portion 21, and the end near the edge of the coil disk 1 is designated as the outer end portion 22. The size of the inner end portion 21 is smaller than the size of the outer end portion 22. The line connecting the center of the inner end portion 21 and the center of the outer end portion 22 does not coincide with the center of the coil disk 1.

[0048] The heating device provided in this embodiment controls multiple electromagnetic heating coils 2 to work alternately and periodically according to the working sequence, working cycle and working parameters of the electromagnetic heating coils 2 set in the cooking program after the user selects a cooking program, so that the heating device heats the food in the inner pot 20 and completes the cooking.

[0049] Because the inner end 21 of the electromagnetic heating coil 2 is smaller than the outer end 22, and the line connecting the centers of the inner end 21 and the outer end 22 does not coincide with the center of the coil disk 1, the outer end 22 of the previous electromagnetic heating coil 2 can be arranged radially adjacent to the inner end 21 of the next electromagnetic heating coil 2. That is, there is at least a partial overlap between two adjacent electromagnetic heating coils 2 when viewed radially from the coil disk 1. Therefore, when multiple electromagnetic heating coils 2 work alternately in a periodic manner, the heating area changes continuously in the circumferential direction of the coil disk 1, and also changes continuously in the radial direction of the coil disk 1. This allows heat convection to be generated in both the circumferential and radial directions within the inner pot 20 of the cooking appliance, improving the heat exchange efficiency within the inner pot 20. Simultaneously, it changes the heat field distribution, improves heating uniformity, and makes the food in the inner pot 20 heated more evenly, thereby improving the cooking effect and enhancing the taste of the food.

[0050] In some embodiments, the size of the electromagnetic heating coil 2 may gradually increase from the inner end 21 to the outer end 22 (e.g., Figure 2 and Figure 3 (As shown). That is, the heating area of ​​the electromagnetic heating coil 2 is gradually varied. When multiple electromagnetic heating coils 2 are periodically and alternately energized, the change in heating area will promote heat convection and further improve heating uniformity and heating efficiency.

[0051] In some embodiments, the size of the electromagnetic heating coil 2 can gradually increase and then gradually decrease from the inner end 21 to the outer end 22, so that when multiple electromagnetic heating coils 2 are periodically alternately energized, the heating area changes, thereby promoting heat convection and improving heating efficiency.

[0052] Optionally, see Figure 4 The line connecting the center of the inner end 21 and the center of the outer end 22 is defined as the centerline 23. Figure 4 The center lines 23 of the multiple electromagnetic heating coils 2 are radially distributed with the center of the coil disk 1 as the center (corresponding to the dashed lines in the area where the electromagnetic heating coil 2 is located). This arrangement allows for overlapping areas between the previous electromagnetic heating coil 2 and the next heating coil. When the multiple electromagnetic heating coils 2 work alternately in a periodic manner, the heating areas will be switched alternately in the circumferential direction, improving the uniformity of heating.

[0053] When the heating device is applied to cooking utensils, by controlling multiple electromagnetic heating coils 2 to work alternately, multiple heating zones are alternately and switched in sequence, which can produce a vortex stirring effect. This can simulate the rotation and stirring of a human hand and realize the heating method of convection stirring, which helps to improve the heating uniformity and taste of food (such as rice).

[0054] In some embodiments, such as Figure 4 As shown, there are six electromagnetic heating coils 2. The center lines 23 of the six electromagnetic heating coils 2 are radially distributed with the center of the coil disk 1 as the center, and the six center lines 23 are arranged in a counterclockwise direction.

[0055] In some embodiments, three electromagnetic heating coils 2 are provided, and the center lines 23 of the three electromagnetic heating coils 2 are radially distributed with the center of the coil disk 1 as the center, and the three center lines 23 are arranged in a counterclockwise direction.

[0056] Of course, in other embodiments, the center lines 23 of the multiple electromagnetic heating coils 2 can also be designed to be arranged sequentially in a clockwise direction and radially distributed. The number of electromagnetic heating coils 2 can be increased or decreased according to actual needs, and is not limited to the number listed above.

[0057] Optionally, see Figure 3 The electromagnetic heating coil 2 has a first side 24 and a second side 25 spaced circumferentially along the coil disk 1. The line connecting the center of the inner end 21 and the center of the outer end 22 is the center line 23. The first side 24 and the second side 25 are asymmetrically distributed on both sides of the center line 23. That is, the first side 24 and the second side 25 are inclined at different angles relative to the center line 23. This arrangement allows the side where the second side 25 of the previous electromagnetic heating coil 2 is located to fit as closely as possible with the side where the first side 24 of the next electromagnetic heating coil 2 is located. In other words, it allows two adjacent electromagnetic heating coils 2 to be as close as possible to each other, reducing the empty area on the coil disk 1, minimizing the gap, and improving the overall heating efficiency of the heating device.

[0058] For example Figure 3 The electromagnetic heating coil 2 shown has a second side 25 with a smaller tilt angle than the first side 24. When two electromagnetic heating coils 2 are arranged adjacent to each other, the second side 25 (gentle side) of the first electromagnetic heating coil 2 is close to the first side 24 (steep side) of the second electromagnetic heating coil 2. This allows the adjacent electromagnetic heating coils 2 to have more overlapping areas on the radial projection of the coil disk 1, thereby achieving a staggered arrangement of multiple electromagnetic heating coils 2 to form a vortex convection heating effect, improving the uniformity of food heating and the taste of the food.

[0059] Optionally, see Figure 3In two adjacent electromagnetic heating coils 2, the second side 25 of one electromagnetic heating coil 2 is at least partially parallel to the first side 24 of the other electromagnetic heating coil 2. This arrangement allows the multiple electromagnetic heating coils 2 to be arranged more compactly, effectively reducing the gap between two adjacent electromagnetic heating coils 2, making the heating area of ​​the coil disk 1 larger and more uniform, and improving the heating effect and heating efficiency of the heating device.

[0060] In some embodiments, such as Figure 3 As shown, the electromagnetic heating coil 2 is approximately triangular in shape, with the long hypotenuse of the previous electromagnetic heating coil 2 adjacent to and parallel to the short hypotenuse of the next electromagnetic heating coil 2, such that the two adjacent electromagnetic heating coils 2 at least partially overlap in the radial direction of the coil disk 1.

[0061] In some embodiments, the electromagnetic heating coil 2 may be designed with a fan-shaped projection surface so that adjacent electromagnetic heating coils 2 at least partially overlap in the radial direction of the coil disk 1.

[0062] Of course, in other embodiments, the shape of the electromagnetic heating coil 2 can be adjusted according to actual design requirements, and is not limited to the specific shapes listed above.

[0063] Optionally, in some embodiments, such as Figure 3 As shown, the second side 25 of the electromagnetic heating coil 2 is a straight side, and the second side 25 extends to a position close to the center of the coil disk 1, so that the inner end 21 of the electromagnetic heating coil 2 is closer to the center area of ​​the coil disk 1, and the heating coverage area is larger.

[0064] Optionally, in some embodiments, such as Figure 9 As shown, the second side 25 includes an arc-shaped segment 251, which is located near the center of the coil disk 1. This arrangement allows the inner end 21 of the electromagnetic heating coil 2 to be closer to the center area of ​​the coil disk 1, resulting in a larger and more uniform area covered by the electromagnetic heating coil 2. Furthermore, the center of the arc of the arc segment 251 coincides with the center of the coil disk 1, ensuring that the arc segment 251 of the second side 25 is close to the center of the coil disk 1. This allows the electromagnetic heating coil 2 to be arranged around the center of the coil disk 1, effectively reducing the empty area on the coil disk 1, minimizing gaps, and improving the overall heating efficiency of the heating device.

[0065] Optionally, see Figure 1 , Figure 2 , Figure 4 and Figure 5 The coil disk 1 is provided with coil fixing areas 11 corresponding to multiple electromagnetic heating coils 2. Figure 5The area within the dashed box (the coil fixing area 11) has a winding groove 15, and the electromagnetic heating coil 2 is wound within the corresponding winding groove 15 in the coil fixing area 11. Dividing the coil disk 1 into multiple independent coil fixing areas 11 allows each electromagnetic heating coil 2 to be precisely wound within its corresponding winding groove 15, ensuring consistent winding spacing of the electromagnetic heating coil 2, thereby guaranteeing a more uniform magnetic field distribution and reducing cold spots. Simultaneously, the winding groove 15 also fixes the position of the electromagnetic heating coil 2, preventing magnetic field scattering and promoting energy concentration.

[0066] Optionally, see Figure 2 and Figure 5 Within the coil fixing area 11, multiple turns of first winding ribs 12 are concentrically arranged, with each turn including at least three first winding ribs 12, and the three first winding ribs 12 are distributed in a triangular pattern, forming a winding groove 15 between adjacent turns of first winding ribs 12. For example, the electromagnetic heating coil 2 is wound with Litz wire. Specifically, during winding, the Litz wire is wound circumferentially around the three first winding ribs 12 of the same turn. The three first winding ribs 12 determine the winding shape of the electromagnetic heating coil 2, ensuring that the shape of the electromagnetic heating coil 2 after winding meets the design requirements. In addition, the three first winding ribs 12 of each turn can form a stable triangular support for the electromagnetic heating coil 2, which can improve the electromagnetic heating coil 2's resistance to electromagnetic vibration and thermal deformation, and extend its service life.

[0067] In this embodiment, as Figure 2 , Figure 4 and Figure 5 As shown, the three first winding ribs 12 with multiple turns form three rows, and the three rows of first winding ribs 12 are radially distributed with the center of the coil fixing area 11 as the center.

[0068] Optionally, see Figure 2 A second winding rib 13 is provided in the area between two adjacent first winding ribs 12 in the same loop, and one second winding rib 13 is provided for each first winding rib 12. The second winding rib 13 can provide support for the electromagnetic heating coil 2 in the area between two first winding ribs 12, further constrain the winding shape of the electromagnetic heating coil 2, and improve the stability of the electromagnetic heating coil 2 after winding, so as to ensure the heating efficiency of the electromagnetic heating coil 2.

[0069] Optionally, multiple sets of electromagnetic heating coils 2 are provided, each set including at least two electromagnetic heating coils 2. The electromagnetic heating coils 2 in the same set are located on the same diameter line of the coil disk 1; or, the electromagnetic heating coils 2 in the same set are arranged adjacent to each other circumferentially. By providing at least two electromagnetic heating coils 2 in each set, at least two electromagnetic heating coils 2 are heating during a certain working cycle, ensuring sufficient heating area. By controlling the periodic alternation of multiple sets of electromagnetic heating coils 2, the electromagnetic heating coils 2 in different positions can work alternately in a certain order and cycle, thereby allowing heat to circulate alternately in a relay-like manner at the bottom of the cooking appliance, improving heating uniformity.

[0070] Optionally, the total number of electromagnetic heating coils 2 is N, where N is an even number. In this case, the number of electromagnetic heating coils 2 in each group can be an even number, for example, each group includes two electromagnetic heating coils 2.

[0071] In some embodiments, the electromagnetic heating coils 2 of the same group are located on the same diameter line of the coil disk 1. For example... Figure 8 As shown, there are six electromagnetic heating coils 2: coil one 210, coil two 220, coil three 230, coil four 240, coil five 250, and coil six 260. Coil one 210 and coil four 240 form one group, coil two 220 and coil five 250 form another group, and coil three 230 and coil six 260 form yet another group. By controlling the three groups of electromagnetic heating coils 2 to work alternately and periodically in a clockwise or counterclockwise direction, the heating position changes periodically.

[0072] In some embodiments, four electromagnetic heating coils 2 may be provided. The four electromagnetic heating coils 2 are respectively the first coil, the second coil, the third coil and the fourth coil arranged in circumferential direction. In this case, the first coil and the third coil can be designed as a group, and the second coil and the fourth coil can be set as a group.

[0073] In some embodiments, eight electromagnetic heating coils 2 may be provided. The eight electromagnetic heating coils 2 are arranged in circumferential direction as coil a, coil b, coil c, coil d, coil e, coil f, coil g and coil h, wherein coil a and coil e form one group, coil b and coil f form one group, coil c and coil g form one group, and coil d and coil h form one group.

[0074] Of course, in other embodiments, the total number of electromagnetic heating coils 2 can also be an odd number. For example, three electromagnetic heating coils 2 can be set, with the center lines 23 of the three electromagnetic heating coils 2 radially distributed with the center of the coil disk 1 as the center. In specific design, the number of electromagnetic heating coils 2 can be selected according to the actual situation, and is not limited to the specific numbers listed above.

[0075] Optionally, see Figure 1 and Figure 2 The heating device also includes magnets 3, which are arranged in multiple sets along the circumference of the coil disk 1. Each set includes at least two magnets 3 arranged sequentially along the radial direction of the coil disk 1. The magnets 3 optimize the magnetic field distribution, ensuring that the magnetic field fully covers the bottom of the coil disk 1, avoiding localized overheating or heating blind spots. By setting multiple sets of magnets 3, each area where the electromagnetic heating coil 2 is located has a magnet 3, preventing the high-frequency alternating magnetic field generated by the electromagnetic heating coil 2 from spreading outwards, reducing the possibility of magnetic field line dissipation, and improving energy conversion efficiency. For example, the magnets 3 are strip-shaped and can be made of ferrite or similar materials with high magnetic permeability.

[0076] Optionally, see Figure 1 and Figure 2 Each electromagnetic heating coil 2 has a magnet 3 arranged in the edge region. This arrangement can further absorb the stray magnetic field radiated outward by the electromagnetic heating coil 2, improve energy conversion efficiency, and reduce electromagnetic interference to surrounding electronic equipment.

[0077] See Figure 1 and Figure 2 On the coil disk 1, there are support ribs 14 in the area between each two adjacent electromagnetic heating coils 2. The support ribs 14 are used to support the magnets 3 in the edge area of ​​the electromagnetic heating coils 2, so as to ensure the installation stability of the magnets 3 at this position.

[0078] Optionally, see Figure 6 and Figure 8 The heating device also includes a control circuit board 4, which is electrically connected to multiple sets of electromagnetic heating coils 2. The multiple sets of electromagnetic heating coils 2 can be periodically and alternately energized or de-energized under the action of the control circuit board 4. By controlling the periodic and alternating operation of the multiple sets of electromagnetic heating coils 2, the coil plate 1 can be heated in zones to meet different cooking needs.

[0079] like Figure 6 and Figure 7 As shown, this embodiment also provides a cooking appliance, including an outer pot body 10, an inner pot 20, and a heating device as described above. The heating device is disposed at the bottom outer side of the inner pot 20, and the inner pot 20 is disposed inside the outer pot body 10. The cooking appliance can be a rice cooker, an electric pressure cooker, etc.

[0080] The cooking appliance provided in this embodiment, when multiple electromagnetic heating coils 2 work alternately in a periodic manner, the heating area in the circumferential direction of the coil plate 1 changes continuously, and at the same time, the heating area in the radial direction of the coil plate 1 also changes continuously. This allows heat convection to be generated in both the circumferential and radial directions in the inner pot 20 of the cooking appliance, improving the heat exchange efficiency in the inner pot 20. At the same time, it changes the heat field distribution, improves the heating uniformity, and makes the food in the inner pot 20 more evenly heated, thereby improving the cooking effect and enhancing the taste of the food.

[0081] like Figure 10 As shown, this embodiment also provides a cooking appliance control method, applied to the cooking appliance described above. The cooking appliance control method includes the following steps:

[0082] S1. Obtain the cooking program;

[0083] S2. Determine the working sequence, working cycle and working parameters of multiple electromagnetic heating coils 2 according to the cooking procedure;

[0084] S3. Control multiple electromagnetic heating coils 2 to work alternately in a periodic manner according to the working sequence, working cycle and working parameters.

[0085] When the user selects a cooking program, the multiple electromagnetic heating coils 2 are controlled to work alternately and periodically according to the working sequence, working cycle and working parameters set by the cooking program, so that the heating device heats the food in the inner pot 20 and completes the cooking.

[0086] Because the inner end 21 of the electromagnetic heating coil 2 is smaller than the outer end 22, and the line connecting the centers of the inner end 21 and the outer end 22 does not coincide with the center of the coil disk 1, the outer end 22 of the previous electromagnetic heating coil 2 can be arranged radially adjacent to the inner end 21 of the next electromagnetic heating coil 2. That is, there is at least a partial overlap between two adjacent electromagnetic heating coils 2 when viewed radially from the coil disk 1. Therefore, when multiple electromagnetic heating coils 2 work alternately in a periodic manner, the heating area changes continuously in the circumferential direction of the coil disk 1, and also changes continuously in the radial direction of the coil disk 1. This allows heat convection to be generated in both the circumferential and radial directions within the inner pot 20 of the cooking appliance, improving the heat exchange efficiency within the inner pot 20. Simultaneously, it changes the heat field distribution, improves heating uniformity, and makes the food in the inner pot 20 heated more evenly, thereby improving the cooking effect and enhancing the taste of the food.

[0087] In some embodiments, in steps S2 and S3, the working sequence includes: controlling multiple electromagnetic heating coils 2 to work alternately and periodically along the circumference of the coil plate 1. By controlling multiple electromagnetic heating coils 2 to work alternately and periodically along the circumference, the electromagnetic heating coils 2 at different positions at different time periods heat the cooking appliance, evenly transferring heat to the inner pot 20 of the cooking appliance, making the food heated more evenly and with better taste.

[0088] In some embodiments, multiple sets of electromagnetic heating coils 2 are provided, each set including at least two electromagnetic heating coils 2, and the electromagnetic heating coils 2 in the same set operate simultaneously. In steps S2 and S3, the working sequence includes controlling the multiple sets of electromagnetic heating coils 2 to operate periodically and alternately. By controlling the multiple sets of electromagnetic heating coils 2 to operate periodically and alternately, the heating area within each working cycle can be guaranteed, and the heat can be circulated alternately in a relay manner at the bottom of the cooking appliance, thereby improving the uniformity of heating.

[0089] Optionally, the working time of a single working cycle is t, and the value of t is in the range of 0.1s≤t≤30s. This setting ensures that the electromagnetic heating coil 2 will not stop working for too long, thus guaranteeing the overall heating efficiency of the heating device. At the same time, it can prevent the electromagnetic heating coil 2 from working continuously for too long, thus preventing excessive overall heating energy consumption.

[0090] Furthermore, different working times can be set according to different cooking programs of the cooking appliances, so that multiple electromagnetic heating coils 2 can work alternately to meet the heating requirements while ensuring low energy consumption.

[0091] For example, cooking appliances have an initial heating stage, a medium heating stage, and a heat preservation stage. In the initial heating stage, the working time of the electromagnetic heating coil 2 in a single working cycle can be designed to be relatively long. In the medium heating stage, the working time can be designed to be relatively short. In the heat preservation stage, the working time can be designed to be the shortest.

[0092] For example, in the initial heating stage: 15s < t ≤ 30s, for example, t can take values ​​of 16s, 18s, 20s, 25s, 30s, etc., but is not limited to the listed values ​​and ranges.

[0093] For example, in the intermediate heating stage: 5s < t ≤ 15s, for example, t can take values ​​of 6s, 8s, 10s, 12s, 15s, etc., but is not limited to the listed values ​​and ranges.

[0094] For example, during the heat preservation stage: 0.1s≤t≤5s, for example, t can take values ​​of 0.1s, 0.5s, 1s, 2s, 3s, 4s, 5s, etc., but is not limited to the listed values ​​and ranges.

[0095] Optionally, in steps S2 and S3, the operating parameters include the heating power and / or operating frequency of the electromagnetic heating coil 2. By adjusting the heating power and / or operating frequency of the electromagnetic heating coil 2, different heating temperatures can be achieved under different cooking programs to meet different cooking needs.

[0096] In some embodiments, the operating parameter can be the heating power of the electromagnetic heating coil 2. Specifically, when the heating power is increased, the heating temperature rises faster; for example, for cooking programs that require high heat, increasing the heating power can achieve rapid heating. When the heating power is decreased, the heating temperature rises slower; for example, for cooking programs that require simmering or keeping warm, decreasing the heating power can allow the temperature to rise slowly or maintain the current temperature.

[0097] In some embodiments, the operating parameter can be the operating frequency of the electromagnetic heating coil 2. Specifically, lowering the operating frequency increases the current in the electromagnetic heating coil 2, strengthens the magnetic field, and thus accelerates the temperature rise. Conversely, raising the operating frequency decreases the current in the electromagnetic heating coil 2, weakens the magnetic field, and thus slows down the temperature rise or maintains a constant temperature. By adjusting the operating frequency, the heating temperature can be continuously and precisely adjusted over a wide range, resulting in more accurate and stable temperature control.

[0098] In some other embodiments, the operating parameters may also be the operating voltage and operating current of the electromagnetic heating coil 2.

[0099] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A heating device, characterized in that, Includes a coil disk (1), on which a plurality of electromagnetic heating coils (2) are arranged in sequence along the circumference, and each electromagnetic heating coil (2) extends from the center position near the coil disk (1) to the edge position of the coil disk (1); The inner end (21) of each electromagnetic heating coil (2) is located near the center of the coil disk (1), and the outer end (22) of each electromagnetic heating coil (2) is located near the edge of the coil disk (1). The size of the inner end (21) is smaller than the size of the outer end (22). The line connecting the center of the inner end (21) and the center of the outer end (22) does not coincide with the center of the coil disk (1).

2. The heating device according to claim 1, characterized in that, The line connecting the center of the inner end (21) and the center of the outer end (22) is the center line (23), and the center lines (23) of the plurality of electromagnetic heating coils (2) are radially distributed with the center of the coil disk (1) as the center.

3. The heating device according to claim 1, characterized in that, The electromagnetic heating coil (2) has a first side (24) and a second side (25) arranged circumferentially along the coil disk (1). The line connecting the center of the inner end (21) and the center of the outer end (22) is a center line (23). The first side (24) and the second side (25) are asymmetrically distributed on both sides of the center line (23).

4. The heating device according to claim 3, characterized in that, In two adjacent electromagnetic heating coils (2), the second side (25) of one electromagnetic heating coil (2) is at least partially parallel to the first side (24) of the other electromagnetic heating coil (2).

5. The heating device according to claim 3, characterized in that, The second side (25) includes an arc segment (251) located near the center of the coil disk (1).

6. The heating device according to claim 1, characterized in that, The coil disk (1) is provided with a coil fixing area (11) corresponding to each of the multiple electromagnetic heating coils (2). A winding groove (15) is provided in the coil fixing area (11), and the electromagnetic heating coil (2) is wound in the winding groove (15) in the corresponding coil fixing area (11).

7. The heating device according to claim 6, characterized in that, Multiple first winding ribs (12) are concentrically arranged within the coil fixing area (11), each winding includes at least three first winding ribs (12), and the three first winding ribs (12) are distributed in a triangular pattern, with the winding groove (15) formed between two adjacent winding ribs (12). A second winding rib (13) is provided in the area between two adjacent first winding ribs (12) in the same loop, and a second winding rib (13) is provided for each first winding rib (12).

8. The heating device according to claim 1, characterized in that, The heating device also includes a control circuit board (4), and the plurality of electromagnetic heating coils (2) are electrically connected to the control circuit board (4); Multiple electromagnetic heating coils (2) work alternately and periodically in sequence along the circumference; or, multiple sets of electromagnetic heating coils (2) are provided, each set including at least two electromagnetic heating coils (2), and multiple sets of electromagnetic heating coils (2) work alternately and periodically, and electromagnetic heating coils (2) in the same set work simultaneously.

9. The heating device according to claim 8, characterized in that, The electromagnetic heating coils (2) of the same group are located on the same diameter line of the coil disk (1); or, the electromagnetic heating coils (2) of the same group are arranged adjacent to each other in the circumferential direction.

10. The heating device according to any one of claims 1-9, characterized in that, The heating device also includes magnets (3), which are arranged in multiple groups along the circumferential direction on the coil disk (1), each group including at least two magnets (3) arranged in sequence along the radial direction of the coil disk (1). And / or, the magnet (3) is arranged in the edge region of each of the electromagnetic heating coils (2).

11. A cooking utensil, characterized in that, It includes an outer pot body (10), an inner pot (20), and a heating device as described in any one of claims 1-10, wherein the heating device is disposed at the bottom outer side of the inner pot (20), and the inner pot (20) is disposed inside the outer pot body (10).

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