Cooking apparatus

Abstract

The utility model discloses a kind of cooking equipment, including cooking pot, first heating device and second heating device, first heating device includes first coil support and first excitation coil, and second heating device includes second coil support and second excitation coil. Among them, first coil support includes first support disc and first fence, first support disc is oppositely arranged with the bottom wall of cooking pot, first fence extends along the circumference of first support disc, and is connected in the side of first support disc towards second coil support, and first fence has air guide structure at the end away from first support disc, for guiding airflow into containing cavity. According to the cooking equipment of the utility model embodiment, more airflow can be guided into containing cavity using air guide structure, the heat dissipation capacity of second excitation coil is enhanced, and it is guaranteed that cooking equipment can work stably.

Description

Technical Field

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

[0002] In related technologies, cooking equipment uses multiple sets of excitation coil windings for heating. However, due to the relatively enclosed space of some excitation coil windings, heat dissipation is poor, and the coils themselves may even be damaged due to overheating. Therefore, there is room for improvement. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a cooking device that can improve the heat dissipation efficiency of the excitation coil and reduce the probability of damage to the excitation coil.

[0004] The cooking device according to an embodiment of the present invention includes a cooking pot, a first heating device, and a second heating device. The first heating device includes a first coil support and a first excitation coil. The first excitation coil is mounted on the first coil support and is disposed opposite to the bottom wall of the cooking pot, for heating the bottom wall of the cooking pot. The second heating device includes a second coil support and a second excitation coil. The second excitation coil is mounted on the second coil support and is disposed opposite to the bottom wall of the cooking pot, for heating the bottom wall of the cooking pot. The first coil support is located on the side of the second coil support away from the cooking pot, and a receiving cavity is defined between the first coil support and the second coil support. The second excitation coil is located in the receiving cavity. The first coil support includes a first support plate and a first surrounding plate. The first support plate is disposed opposite to the bottom wall of the cooking pot. The first surrounding plate extends circumferentially along the first support plate and is connected to the side of the first support plate facing the second coil support. The end of the first surrounding plate away from the first support plate has an air guide structure for guiding airflow into the receiving cavity.

[0005] According to the embodiments of the present invention, the cooking device has an air guide structure at the end of the first enclosure away from the first support plate. The air guide structure can guide more airflow into the receiving cavity, increase the airflow into the receiving cavity, and allow the airflow to carry away the heat of the second excitation coil, thereby improving the heat dissipation efficiency of the second excitation coil. This keeps the temperature of the second excitation coil within a suitable range, reduces the probability of damage to the second excitation coil, and ensures that the cooking device can work stably.

[0006] In some embodiments, the air guiding structure includes an air guiding groove with the opening of the air guiding groove facing upward, and the circumferential dimension of the air guiding groove in the first enclosure gradually decreases from top to bottom.

[0007] In some specific embodiments, the air guide duct has a first duct sidewall and a second duct sidewall disposed circumferentially opposite to the first enclosure; wherein each of the first duct sidewall and the second duct sidewall includes a first extension segment and a second extension segment, the upper end of the second extension segment is connected to the lower end of the first extension segment, and the second extension segment of the first duct sidewall and the second extension segment of the second duct sidewall are both arc-shaped structures and are bent in opposite directions.

[0008] In some embodiments, the first enclosure includes a plurality of air guide plates arranged circumferentially on the first support plate, wherein the dimension of each air guide plate in the circumferential direction of the first support plate gradually decreases from bottom to top, thereby defining the air guide groove between any two adjacent air guide plates; wherein each air guide plate is an arc-shaped plate extending circumferentially along the first support plate, and the arc-shaped plate gradually moves away from the central axis of the cooking pot from bottom to top; and / or, the tangent of the side edge of each air guide plate away from the first support plate forms an angle with a horizontal plane, the horizontal plane being perpendicular to the central axis of the cooking pot, and the angle first decreases and then increases from one end of the edge to the other.

[0009] In some examples, the depth of the air guide groove in the height direction of the cooking pot is 5mm-30mm.

[0010] In some examples, the second heating device further includes a third excitation coil, which is mounted on the second coil support and disposed opposite to the peripheral wall of the cooking pot, for heating the peripheral wall of the cooking pot; wherein the third excitation coil includes multiple coil segments, which are wound from bottom to top in the height direction of the cooking pot.

[0011] In some specific examples, the air guide duct has a first duct sidewall and a second duct sidewall disposed circumferentially opposite to the first enclosure; the upper ends of the first duct sidewall and the second duct sidewall are configured to be higher than the second coil segment from bottom to top and lower than the middle of the third excitation coil in the height direction of the cooking pot; and / or, the lower ends of the first duct sidewall and the second duct sidewall are configured to be higher than 10 mm below the first coil segment from bottom to top and lower than 10 mm above the first coil segment from bottom to top.

[0012] In some embodiments, the air guide trough has a first trough sidewall and a second trough sidewall disposed circumferentially opposite to each other on the first enclosure; a plane perpendicular to the central axis of the cooking pot is a first plane, the projection of the intersection point of the first trough sidewall and the second trough sidewall near each other on the first plane is a first projection point, and the projection of the central axis of the cooking pot on the first plane is a second projection point; wherein, a plane perpendicular to the line connecting the first projection point and the second projection point is a second plane, and the angle between the tangent of the projection of the first trough sidewall onto the second plane and the tangent of the projection of the second trough sidewall onto the second plane is 30°-180°.

[0013] In some embodiments, the first coil support has a vent in the middle, the vent connecting the receiving cavity and the lower space of the first coil support; wherein, the cooking device further includes a cooling fan, the cooling fan being disposed around the first coil support and the second coil support, for driving airflow to form an airflow so that at least part of the airflow enters the receiving cavity and flows out from the vent; and / or, the cross-section of the receiving cavity through the central axis of the cooking pot has a trend of first decreasing and then increasing from the outer periphery of the first coil support towards the vent, the second excitation coil being located in the area of ​​increased cross-section of the receiving cavity; and / or, the first coil support has a vent at a position opposite to the first excitation coil, the vent connecting the receiving cavity and the lower space of the first coil support, a plurality of vents being arranged circumferentially around the first excitation coil, the first excitation coil being limited on the first coil support by a plurality of limiting members, the plurality of limiting members corresponding one-to-one with the positions of the plurality of vents.

[0014] In some embodiments, in a plane perpendicular to the central axis of the cooking pot, the projection of the first excitation coil partially overlaps with the projection of the second excitation coil.

[0015] In some embodiments, there are multiple first excitation coils, which are arranged circumferentially in an imaginary circle. The center of the imaginary circle is located on the central axis of the cooking pot, and the imaginary circle is located on a plane perpendicular to the central axis of the cooking pot. The center point of the multiple first excitation coils is located on a virtual circle. The center of the second excitation coil and the center of the virtual circle are both located on the central axis of the cooking pot, and the outer circumferential dimension of the second excitation coil is not greater than the outer circumferential dimension of the virtual circle.

[0016] In some examples, the second heating device further includes a third excitation coil mounted on the second coil support and disposed opposite to the peripheral wall of the cooking pot for heating the peripheral wall of the cooking pot; wherein, in a plane perpendicular to the central axis of the cooking pot, the projection of the third excitation coil partially overlaps with the projection of the first excitation coil.

[0017] In some specific examples, the current direction of the second excitation coil and the third excitation coil is the same at the same time point, and the current direction of the second excitation coil / the third excitation coil is the same as or opposite to that of the first excitation coil at the same time point.

[0018] In some embodiments, the cooking device further includes a base, the cooking pot is disposed above the base, the base has a mounting area, the first excitation coil is located between the cooking pot and the mounting area, and the mounting area is disposed opposite to the first excitation coil; wherein, the first excitation coil is located on the side of the first coil support away from the second coil support, and no magnet is disposed between the mounting area and the first excitation coil; and / or, the second excitation coil is located between the cooking pot and the mounting area, the mounting area is also disposed opposite to the second excitation coil, and no magnet is disposed between the mounting area and the second excitation coil.

[0019] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model 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 partial schematic diagram of a cooking device according to an embodiment of the present utility model; Figure 2 This is a partial exploded view of a cooking device according to an embodiment of the present utility model; Figure 3 It is a projection diagram of the first excitation coil, the second excitation coil, and the third excitation coil in a plane perpendicular to the central axis of the cooking pot; Figure 4 yes Figure 2 A schematic diagram of the structure of the first coil support in the middle; Figure 5 yes Figure 1 A schematic diagram of the cooking equipment without the cooling fan; Figure 6 yes Figure 4 A partial enlarged view of the air guide structure of the first coil support shown; Figure 7 yes Figure 5 A schematic diagram of the heat dissipation airflow direction of the cooking equipment in the picture; Figure 8 yes Figure 5 A cross-sectional view of the cooking equipment in the picture; Figure 9 yes Figure 8 A close-up view of the cooking equipment shown.

[0021] Figure label: Cooking equipment 100; 10. Cooking pot; 11. Bottom wall; 12. Circumferential wall; First heating device 20; First coil bracket 21; receiving cavity 21a; air outlet 21b; ventilation opening 21c; first support plate 211; limiting member 2111; first enclosure 212; air inlet confluence part 212a; air guide plate 2121; air guide structure 213; first slot sidewall 2131; second slot sidewall 2132; air guide slot 214; slot opening 214a; first extension section 215; second extension section 216; First excitation coil 22; Virtual coil 220; Second heating device 30; second coil bracket 31; mounting groove 310; second support plate 311; receiving cavity 311a; second enclosure plate 312; second excitation coil 32; third excitation coil 33; coil segment 331; Cooling fan 40; Base 50; mounting area 50a. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown 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 utility model, and should not be construed as limiting this utility model.

[0023] The following is for reference. Figures 1-9 A cooking apparatus 100 according to an embodiment of the present utility model is described.

[0024] Reference Figures 1-4 According to an embodiment of the present invention, the cooking device 100 includes a cooking pot 10 and a first heating device 20. The first heating device 20 includes a first coil support 21 and a first excitation coil 22. The first excitation coil 22 is mounted on the first coil support 21 and is disposed opposite to the bottom wall 11 of the cooking pot 10. The first excitation coil 22 is used to heat the bottom wall 11 of the cooking pot 10.

[0025] The cooking device 100 also includes a second heating device 30, which includes a second coil support 31 and a second excitation coil 32. The second excitation coil 32 is mounted on the second coil support 31 and is disposed opposite to the bottom wall 11 of the cooking pot 10. The second excitation coil 32 is used to heat the bottom wall 11 of the cooking pot 10.

[0026] The first coil support 21 is located on the side of the second coil support 31 away from the cooking pot 10. The first coil support 21 and the second coil support 31 define a receiving cavity 21a. The second excitation coil 32 is located in the receiving cavity 21a. The first coil support 21 includes a first support plate 211 and a first surrounding plate 212. The first support plate 211 is disposed opposite to the bottom wall 11 of the cooking pot 10. The first surrounding plate 212 extends circumferentially along the first support plate 211 and is connected to the side of the first support plate 211 facing the second coil support 31. The end of the first surrounding plate 212 away from the first support plate 211 has an air guide structure 213, which is used to guide airflow into the receiving cavity 21a.

[0027] It should be noted that the first excitation coil 22 and the second excitation coil 32 are composed of wires capable of conducting alternating current and generating an alternating magnetic field. When the cooking device 100 is in operation, the first heating device 20 and the second heating device 30 are supplied with high-frequency alternating current, causing electromagnetic induction in the first excitation coil 22 and the second excitation coil 32, generating an alternating magnetic field that acts on the cooking pot 10. The cooking pot 10 induces eddy currents and generates heat, thereby heating the food inside the cooking pot 10. Compared with traditional open flame or resistance heating methods, electromagnetic heating significantly improves thermal efficiency.

[0028] In traditional cooking equipment, the heating element on the bottom wall of the cooking pot typically uses a single set of excitation coil windings for electromagnetic heating. While this achieves electromagnetic heating, the heating performance of a single set of excitation coil windings is weak in high-heat or large-capacity cooking scenarios, failing to meet user needs. As a result, some cooking equipment manufacturers have begun to design solutions that combine multiple sets of excitation coil windings for electromagnetic heating to increase magnetic field strength, power, and heating performance. However, in multi-set excitation coil windings, some windings are placed in relatively enclosed spaces, leading to poor heat dissipation and even damage to the excitation coils themselves due to overheating.

[0029] Specifically, in the above technical solution, the second excitation coil 32 is located between the first support plate 211 and the second coil bracket 31. That is, the first support plate 211 shields the second excitation coil 32, making the contact area between the second excitation coil 32 and the air smaller. Under natural conditions, less heat is carried away by the air. At the same time, the first support plate 211 inhibits the heat dissipation of the second excitation coil 32, resulting in poor heat dissipation effect of the second excitation coil 32 under normal conditions. As the working time increases, the heat accumulation is more serious, which leads to a higher temperature of the second excitation coil 32. It may even affect the working stability of the second excitation coil 32, and thus cause a decrease in the cooking performance of the cooking equipment 100.

[0030] Therefore, the cooking device 100 according to this utility model embodiment provides an air guide structure 213 at the end of the first enclosure 212 away from the first support plate 211. The air guide structure 213 can guide more airflow into the receiving cavity 21a, increasing the airflow into the receiving cavity 21a. This allows the airflow to carry away the heat of the second excitation coil 32, improving the heat dissipation efficiency of the second excitation coil 32. As a result, the temperature of the second excitation coil 32 is kept within a suitable range, reducing the probability of damage to the second excitation coil 32 and ensuring that the cooking device 100 can work stably.

[0031] In some embodiments, the first coil support 21 and the second coil support 31 may both be a plastic part that partially encloses the cooking pot 10, capable of supporting the first excitation coil 22 and the second excitation coil 32 respectively.

[0032] Reference Figure 4 , Figure 5 and Figure 6 In some embodiments, the air guide structure 213 includes an air guide groove 214 with the groove opening 214a facing upwards. The circumferential dimension of the air guide groove 214 in the first enclosure 212 gradually decreases from top to bottom.

[0033] In the above technical solution, by setting the air guide structure 213 to include the air guide groove 214, and setting the size of the air guide groove 214 in the circumferential direction of the first enclosure plate 212 to gradually decrease from top to bottom, the air can be effectively guided into the receiving cavity 21a, thereby improving the heat dissipation effect of the second excitation coil 32.

[0034] Reference Figure 2 , Figure 4 and Figure 6 In some specific embodiments, the air guide trough 214 has a first trough sidewall 2131 and a second trough sidewall 2132 arranged circumferentially opposite to the first enclosure plate 212.

[0035] Each of the first groove sidewall 2131 and the second groove sidewall 2132 includes a first extension 215 and a second extension 216. The upper end of the second extension 216 is connected to the lower end of the first extension 215. The second extension 216 of the first groove sidewall 2131 and the second extension 216 of the second groove sidewall 2132 are both arc-shaped structures and are bent in opposite directions, thereby defining the air inlet confluence section 212a.

[0036] Specifically, in the height direction of the cooking pot 10, the first groove sidewall 2131 and the second groove sidewall 2132 extend from top to bottom toward each other, thereby giving the periphery of the first enclosure 212 a height difference feature. The second extension 216 of the first groove sidewall 2131 and the second extension 216 between the second groove sidewall 2132 define the air inlet confluence section 212a. When the airflow passes through the air guide structure 213, most of the airflow can be guided from the air inlet confluence section 212a into the receiving cavity 21a, so that the airflow carries away the heat generated by the second excitation coil 32.

[0037] For example, in the height direction of the cooking pot 10, the distance between the first groove sidewall 2131 and the second groove sidewall 2132 in the circumferential direction of the first enclosure 212 gradually decreases from top to bottom. Even if the air inlet confluence 212a is funnel-shaped or cone-shaped, the airflow here is compressed and accelerated, so that the airflow velocity flowing from the air inlet confluence 212a into the receiving cavity 21a increases by at least 30%. The high-speed airflow can carry away more heat and significantly improve the heat dissipation effect of the second excitation coil 32.

[0038] Reference Figures 4-7 In some embodiments, the first enclosure 212 includes a plurality of air guide plates 2121, which are arranged circumferentially on the first support plate 211. The size of each air guide plate 2121 in the circumferential direction of the first support plate 211 gradually decreases from bottom to top, so that an air guide groove 214 is defined between any two adjacent air guide plates 2121.

[0039] In some examples, each air guide plate 2121 is an arc-shaped plate extending circumferentially along the first support plate 211, and the arc-shaped plate gradually moves away from the central axis of the cooking pot 10 from bottom to top.

[0040] In other words, the cross-sectional shape of each air guide plate 2121 perpendicular to the central axis of the cooking pot 10 is arc-shaped, and the cross-section of each air guide plate 2121 passing through the central axis of the cooking pot 10 gradually moves away from the central axis of the cooking pot 10 from bottom to top. For example, the cross-section of each air guide plate 2121 passing through the central axis of the cooking pot 10 can be oblique or arc-shaped.

[0041] In other examples, the tangent of the side edge of each air guide 2121 away from the first support plate 211 forms an angle with a horizontal plane perpendicular to the central axis of the cooking pot 10. The angle decreases and then increases from one end of the edge to the other. In other words, the angle is smallest at the middle of the edge, for example, it can be 0°, and largest at both ends of the edge, so that the edge of the air guide 2121 extends smoothly.

[0042] In some other examples, each air guide plate 2121 is an arc-shaped plate extending circumferentially along the first support plate 211, and the arc-shaped plate gradually moves away from the central axis of the cooking pot 10 from bottom to top. The tangent of the side edge of each air guide plate 2121 away from the first support plate 211 has an angle with a horizontal plane, and the horizontal plane is perpendicular to the central axis of the cooking pot 10. The angle tends to decrease first and then increase from one end of the edge to the other end.

[0043] This configuration allows the periphery of the first enclosure 212 to form multiple funnel-shaped, cone-shaped, or petal-shaped structures, enabling more airflow to flow into the receiving cavity 21a under the guidance of multiple air guide slots 214, thus significantly improving the heat dissipation effect of the second excitation coil 32.

[0044] Reference Figure 4 In some examples, the depth of the air guide slot 214 in the height direction of the cooking pot 10 is 5mm-30mm. For example, the depth of the air guide slot 214 in the height direction of the cooking pot 10 can be 5mm, 6mm, 10mm, 20mm, 25mm, 29mm, 30mm, etc.

[0045] Specifically, the depth of the air guide slot 214 in the height direction of the cooking pot 10 is... Figure 5 H in the middle.

[0046] If H < 5mm, the guiding distance of the airflow by the air guide structure 213 will be reduced, thereby affecting the airflow of the air guide structure 213 and thus weakening the heat dissipation effect of the second excitation coil 32.

[0047] If H > 30mm, although this will increase the air guiding distance of the air guiding structure 213 and thus increase the air guiding volume of the air guiding structure 213, it will also increase the area of ​​the first enclosure plate 212. This will not only cause the first enclosure plate 212 to cover a larger area of ​​the peripheral wall 12, hindering the heat dissipation of the excitation coil on the peripheral wall 12, but also increase the production cost.

[0048] Therefore, in the above technical solution, by setting the depth H of the air guide groove 214 in the height direction of the cooking pot 10 to 5-30mm, the heat dissipation effect of the first enclosure plate 212 on the excitation coil on the peripheral wall 12 of the cooking pot 10 can be reduced while ensuring the air volume, and the production cost can be reduced.

[0049] Reference Figure 2 and Figure 5 In some examples, the second heating device 30 also includes a third excitation coil 33, which is mounted on the second coil bracket 31 and is disposed opposite to the peripheral wall 12 of the cooking pot 10. The third excitation coil 33 is used to heat the peripheral wall 12 of the cooking pot 10.

[0050] The third excitation coil 33 includes multiple coil segments 331, which are wound from bottom to top in the height direction of the cooking pot 10.

[0051] For cooking appliances 100 with a large capacity, such as rice cookers and pressure cookers, the food inside the cooking pot 10 is often quite large. If the bottom wall 11 of the cooking pot 10 is heated only by the first excitation coil 22 and the second excitation coil 32, the food near the bottom of the cooking pot 10 can be heated evenly, but the food far from the bottom wall 11 of the cooking pot 10 cannot be heated sufficiently. For foods that require even heating, the cooking performance of the cooking appliance 100 cannot meet the requirements.

[0052] Therefore, by installing the third excitation coil 33 on the second coil bracket 31 and setting the third excitation coil 33 opposite to the peripheral wall 12 of the cooking pot 10, the peripheral wall 12 of the cooking pot 10 can be heated by the third excitation coil 33, so that the food in the cooking pot 10 is heated more evenly. By setting the third excitation coil 33 to include multiple coil segments 331, which are coiled from bottom to top in the height direction of the cooking pot 10, the magnetic fields generated by the multiple coil segments 331 can be superimposed after the third excitation coil 33 is energized, thereby increasing the magnetic field strength and improving the heating effect of the third excitation coil 33 on the peripheral wall 12 of the cooking pot 10.

[0053] Refer again Figure 2 and Figure 5 In some specific examples, the air guide slot 214 has a first slot sidewall 2131 and a second slot sidewall 2132 arranged circumferentially opposite to the first enclosure 212. The upper ends of the first slot sidewall 2131 and the second slot sidewall 2132 are configured to be higher than the second coil segment 331 from bottom to top and lower than the middle of the third excitation coil 33 in the height direction of the cooking pot 10.

[0054] If the upper ends of the first slot sidewall 2131 and the second slot sidewall 2132 are lower than the second coil segment 331 from bottom to top, then the air guiding structure 213 guides the air for a shorter distance, resulting in less airflow guided into the receiving cavity 21a by the air guiding structure 213, thereby weakening the heat dissipation effect of the first excitation coil 22 and the second excitation coil 32.

[0055] If the upper ends of the first groove sidewall 2131 and the second groove sidewall 2132 are higher than the middle of the third excitation coil 33 in the height direction of the cooking pot 10, although this will increase the air guiding distance of the air guiding structure 213 and thus increase the air guiding volume of the air guiding structure 213, it will increase the area of ​​the first enclosure plate 212. On the one hand, the first enclosure plate 212 will cover a larger area of ​​the peripheral wall 12, hindering the heat dissipation of the third excitation coil 33, and on the other hand, it will increase the production cost.

[0056] Therefore, in the above technical solution, by constructing the upper ends of the first groove sidewall 2131 and the second groove sidewall 2132 to be higher than the second coil segment 331 from bottom to top and lower than the middle of the third excitation coil 33 in the height direction of the cooking pot 10, the heat dissipation effect of the first enclosure 212 on the third excitation coil 33 can be reduced while ensuring the air volume, and the production cost can be reduced.

[0057] In other specific examples, the lower ends of the first groove sidewall 2131 and the second groove sidewall 2132 are configured to be 10 mm above the first coil segment 331 from bottom to top and 10 mm below the first coil segment 331 from bottom to top.

[0058] This configuration allows the air inlet confluence section 212a to be positioned closer to the receiving cavity 21a, enabling the airflow guided by the air guide structure 213 to flow smoothly into the receiving cavity 21a from the air inlet confluence section 212a. This avoids the airflow guided by the air guide structure 213 being obstructed at the air inlet confluence section 212a, reducing the airflow into the receiving cavity 21a and thus affecting the heat dissipation effect of the first excitation coil 22 and the second excitation coil 32.

[0059] Reference Figure 4 In some embodiments, the air guide slot 214 has a first slot sidewall 2131 and a second slot sidewall 2132 arranged circumferentially opposite to each other on the first enclosure 212. A plane perpendicular to the central axis of the cooking pot 10 is a first plane. The projection of the intersection of the first slot sidewall 2131 and the second slot sidewall 2132 at their closest ends onto the first plane is a first projection point. The projection of the central axis of the cooking pot 10 onto the first plane is a second projection point.

[0060] The plane perpendicular to the line connecting the first projection point and the second projection point is the second plane. The angle between the tangent of the projection of the first groove sidewall 2131 onto the second plane and the tangent of the projection of the second groove sidewall 2132 onto the second plane is 30°-180°. For example, the angle can be 30°, 35°, 45°, 70°, 100°, 150°, 179°, etc.

[0061] Specifically, the tangent line to the projection of the first groove sidewall 2131 onto the second plane is L1, and the tangent line to the projection of the second groove sidewall 2132 onto the second plane is L2. The angle between the tangent line L1 to the projection of the first groove sidewall 2131 onto the second plane and the tangent line L2 to the projection of the second groove sidewall 2132 onto the second plane is [missing information]. Figure 4 α in.

[0062] If α < 30°, the area occupied by the first groove sidewall 2131 and the second groove sidewall 2132 in the circumferential direction of the first enclosure plate 212 will be small, which will result in an excessive number of air guiding structures 213 on the first enclosure plate 212, which will have a greater dispersing effect on the airflow, resulting in a smaller airflow into the receiving cavity 21a, and ultimately affecting the heat dissipation effect of the first excitation coil 22 and the second excitation coil.

[0063] Furthermore, due to the structural limitations of the first enclosure plate 212, the angle α between the tangent L1 of the projection of the first groove sidewall 2131 onto the second plane and the tangent L2 of the projection of the second groove sidewall 2132 onto the second plane is less than 180°.

[0064] Therefore, in the above technical solution, the tangent of the projection of the first groove sidewall 2131 onto the second plane is L1, and the tangent of the projection of the second groove sidewall 2132 onto the second plane is L2. By setting the included angle formed by L1 and L2 to 30°-180°, the number of air guiding structures 213 can be moderate, thereby ensuring the airflow into the receiving cavity 21a and improving the heat dissipation effect of the first excitation coil 22 and the second excitation coil 32.

[0065] Reference Figure 1 , Figure 7 and Figure 8 In some embodiments, the middle part of the first coil support 21 has an air vent 21b, which connects the receiving cavity 21a and the lower space of the first coil support 21.

[0066] The cooking device 100 also includes a cooling fan 40, which is located around the first coil support 21 and the second coil support 31. The cooling fan 40 is used to drive airflow to form an airflow so that at least part of the airflow enters the receiving cavity 21a and flows out from the air outlet 21b.

[0067] Specifically, when the cooking device 100 is working, the cooling fan 40 is activated and drives the air to form an airflow so that at least part of the airflow enters the receiving cavity 21a under the guidance of the air guide structure 213. The airflow flows through the second excitation coil 32 in the receiving cavity 21a, which can carry away the heat generated by the second excitation coil 32, and finally flows out from the air outlet 21b.

[0068] This configuration allows the cooling fan 40 to increase the airflow into the receiving cavity 21a and increase the airflow velocity, preventing the first excitation coil 22 and the second excitation coil 32 (especially the overlapping part) from overheating due to heat accumulation.

[0069] Reference Figure 8 and Figure 9 In other embodiments, the cross section of the receiving cavity 21a passing through the central axis of the cooking pot 10 shows a trend of first decreasing and then increasing from the outer periphery of the first coil support 21 towards the air vent 21b, and the second excitation coil 32 is located in the area where the cross section of the receiving cavity 21a increases.

[0070] By setting the cross-section of the receiving cavity 21a through the central axis of the cooking pot 10 to first decrease and then increase from the outer periphery of the first coil support 21 to the air outlet 21b, similar to a Venturi channel, the airflow can increase the airflow velocity and reduce the pressure when passing through the contraction section of the Venturi channel, reaching the maximum velocity and minimum pressure at the throat, while the velocity decreases and the pressure rises in the expansion section, thereby realizing the self-absorption function of the airflow, so that the airflow can carry away more heat when passing through the second excitation coil 32, effectively reducing the temperature of the second excitation coil 32 when it is energized.

[0071] In some other embodiments, the first coil support 21 has multiple ventilation openings 21c at a position opposite to the first excitation coil 22. The ventilation openings 21c connect the receiving cavity 21a and the lower space of the first coil support 21. The multiple ventilation openings 21c are arranged circumferentially on the first excitation coil 22, and the first excitation coil 22 is limited on the first coil support 21 by multiple limiting members 2111, with each limiting member 2111 corresponding to one of the multiple ventilation openings 21c.

[0072] With this configuration, the airflow enters the receiving cavity 21a under the guidance of the air guide structure 213. The airflow flows through the second excitation coil 32 in the receiving cavity 21a, which can carry away the heat generated by the second excitation coil 32. The airflow can flow out from the air outlet 21b and the ventilation opening 21c. Since the ventilation opening 21c is set opposite to the first excitation coil 22, the airflow can also carry away the heat of the first excitation coil 22, thus improving the heat dissipation effect of the first excitation coil 22.

[0073] Reference Figures 1-3 In some embodiments, the projection of the first excitation coil 22 and the projection of the second excitation coil 32 partially overlap in a plane perpendicular to the central axis of the cooking pot 10.

[0074] In the above technical solution, by making the projection of the first excitation coil 22 and the projection of the second excitation coil 32 partially overlap in a plane perpendicular to the central axis of the cooking pot 10, on the one hand, the magnetic fields generated by the first excitation coil 22 and the second excitation coil 32 can be partially superimposed, thereby enhancing the magnetic field strength acting on the cooking pot 10. On the other hand, the magnetic field distribution area acting on the cooking pot 10 can be increased, further improving the power and heating performance of the cooking equipment 100, and meeting the user's needs for high-power cooking or large-capacity cooking.

[0075] Reference Figure 2 , Figure 3 and Figure 7 In some embodiments, there are multiple first excitation coils 22, which are arranged circumferentially in an imaginary circle. The center of the imaginary circle is located on the central axis of the cooking pot 10, and the imaginary circle is located on a plane perpendicular to the central axis of the cooking pot 10.

[0076] In the above technical solution, by setting multiple first excitation coils 22, it is convenient to adjust the position of the multiple first excitation coils 22 respectively to meet the design requirements; by overlapping a part of the multiple first excitation coils 22 with a part of the second excitation coil 32, the magnetic field strength acting on the cooking pot 10 can be increased to a certain extent, but the magnetic field strength of the overlapping part of the first excitation coil 22 and the second excitation coil 32 is avoided from being too strong, which would cause the local temperature of the cooking pot 10 to be too high.

[0077] Reference Figure 3 The center points of the multiple first excitation coils 22 are located on a virtual ring. The center of the second excitation coil 30 and the center of the virtual ring 220 are both located on the central axis of the cooking pot 10, and the outer perimeter of the second excitation coil 30 is no larger than the outer perimeter of the virtual ring. This arrangement increases the distribution area of ​​the multiple first excitation coils 22 and the second excitation coils 32, thereby increasing the heating area and improving heating efficiency.

[0078] Reference Figures 1-3 and further refer to Figure 8 In some examples, the second heating device 30 also includes a third excitation coil 33, which is mounted on the second coil bracket 31 and is disposed opposite to the peripheral wall 12 of the cooking pot 10. The third excitation coil 33 is used to heat the peripheral wall 12 of the cooking pot 10.

[0079] In a plane perpendicular to the central axis of the cooking pot 10, the projection of the third excitation coil 33 partially overlaps with the projection of the first excitation coil 22.

[0080] In the above technical solution, by setting the third excitation coil 33 opposite to the peripheral wall 12, the peripheral wall 12 of the cooking pot 10 can be heated by the third excitation coil 33. Combined with the first excitation coil 22 and the second excitation coil 32, the food in the cooking pot 10 can be fully heated, thereby improving the cooking performance of the cooking device 100. In the plane perpendicular to the central axis of the cooking pot 10, by setting the projection of the third excitation coil 33 to overlap with the projection of the first excitation coil 22, the magnetic field generated by part of the first excitation coil 22 and the magnetic field generated by part of the third excitation coil 33 can be superimposed, thereby enhancing the magnetic field strength on the peripheral wall 12 of the cooking pot 10 and further improving the heating performance of the cooking device 100.

[0081] In some optional examples, the second coil support 31 is provided with a mounting groove 310, in which the second excitation coil 32 and the third excitation coil 33 can be embedded to fix the second excitation coil 32 and the third excitation coil 33, so as to prevent the second excitation coil 32 and the third excitation coil 33 from detaching from the second coil support 31 during the use of the cooking device 100, which would cause the magnetic field acting on the cooking pot 10 to change and ultimately cause the temperature of the cooking pot 10 to change.

[0082] For example, the second excitation coil 32 and the third excitation coil 33 are connected in series, which simplifies the control logic of the second excitation coil 32 and the third excitation coil 33 and reduces production costs.

[0083] Reference Figure 8 and Figure 9 In some specific examples, the second coil support 31 includes a second support plate 311 and a second enclosure plate 312. The second support plate 311 is disposed opposite to the first support plate 211 in the vertical direction, and the second support plate 311 is located above the first support plate 211. The second enclosure plate 312 extends circumferentially along the second support plate 311 and defines a receiving cavity 311a with the second support plate 311. The cooking pot 10 is disposed in the receiving cavity 311a.

[0084] The second excitation coil 32 is located on the side of the second support plate 311 away from the receiving cavity, and the third excitation coil 33 is located on the side of the second enclosure plate 312 away from the receiving cavity 311a.

[0085] Reference Figure 2 and Figure 3 In some specific examples, the current direction of the second excitation coil 32 and the third excitation coil 33 is the same at the same time point, and the current direction of the second excitation coil 32 / third excitation coil 33 is the same as or opposite to that of the first excitation coil 22 at the same time point.

[0086] For example, the current direction of the second excitation coil 32 and the third excitation coil 33 is the same as that of the first excitation coil 22 at the same time point. The current direction of the overlapping part of the second excitation coil 32 and the first excitation coil 22 is opposite. Therefore, the magnetic fields of the second excitation coil 32 and the first excitation coil 22 at the overlapping part will weaken each other, thereby weakening the magnetic field strength acting on the cooking pot 10 at the overlapping part, forming a weak heat zone. On the other hand, the current direction of the third excitation coil 33 is the same as that of the first excitation coil 22 at the overlapping part. Therefore, the magnetic fields of the third excitation coil 33 and the first excitation coil 22 at the overlapping part are superimposed, thereby strengthening the magnetic field strength acting on the cooking pot 10 at the overlapping part, forming a strong heat zone. Heat from the high-heat areas flows upward from the peripheral wall 12 of the cooking pot 10 and then downward to the low-heat areas. That is, heat flows in a rotating manner from the peripheral wall 12 of the cooking pot 10 to the bottom wall 11 of the cooking pot 10, thus creating a tumbling heating effect. At the same time, in the non-overlapping parts, the magnetic field still acts on the cooking pot 10. Therefore, the non-overlapping parts are the secondary heat areas, not the cold heat areas, so that the temperature of the cooking pot 10 is kept in the high-temperature range, and the food in the cooking pot 10 is prevented from being affected by local cold areas in the cooking pot 10.

[0087] For example, the current direction of the second excitation coil 32 and the first excitation coil 22 is opposite at the same time point. The current direction of the overlapping portion of the second excitation coil 32 and the first excitation coil 22 is the same. Therefore, the magnetic fields of the second excitation coil 32 and the first excitation coil 22 at the overlapping portion are superimposed, thereby enhancing the magnetic field strength acting on the cooking pot 10 at the overlapping portion and forming a strong heat zone. However, the current direction of the third excitation coil 33 is opposite to that of the first excitation coil 22 at the overlapping portion. Therefore, the magnetic fields of the third excitation coil 33 and the first excitation coil 22 at the overlapping portion will weaken each other, thereby weakening the magnetic field strength acting on the cooking pot 10 at the overlapping portion and forming a weak heat zone. Heat from the high-heat areas flows upward from the bottom wall 11 of the cooking pot 10 and then downward to the low-heat areas. In other words, heat flows in a swirling motion from the bottom wall 11 to the side wall of the cooking pot 10, creating a tumbling heating effect. At the same time, in the non-overlapping areas, a magnetic field still acts on the cooking pot 10. Therefore, the non-overlapping areas are secondary heat areas, not cold areas, which keeps the temperature of the cooking pot 10 in a high-temperature range and prevents the food inside the cooking pot 10 from being affected by localized cold areas.

[0088] In the above technical solution, by setting the second excitation coil 32 and the third excitation coil 33 to have the same current direction at the same time point, and setting the second excitation coil 32 / the third excitation coil 33 and the first excitation coil 22 to have the same or opposite current direction at the same time point, a strong heat zone and a weak heat zone can be formed on the cooking pot 10. The heat from the strong heat zone will flow to the weak heat zone, thereby forming a tumbling heating effect, which can improve the cooking performance of the cooking equipment 100.

[0089] Reference Figure 2 In some embodiments, the cooking device 100 further includes a base 50, with the cooking pot 10 disposed above the base 50. The base 50 has a mounting area 50a, and a first excitation coil 22 is located between the cooking pot 10 and the mounting area 50a, with the mounting area 50a and the first excitation coil 22 being disposed opposite each other. Specifically, the first excitation coil 22 is located on the side of the first coil support 21 facing away from the second coil support 31, and no magnet is disposed between the mounting area 50a and the first excitation coil 22; and / or, a second excitation coil 32 is located between the cooking pot 10 and the mounting area 50a, with the mounting area 50a also being disposed opposite to the second excitation coil 32, and no magnet is disposed between the mounting area 50a and the second excitation coil 32.

[0090] It should be noted that "installation area 50a" here refers to the area where the projection of the first excitation coil 22 is located on the plane of the base 50.

[0091] Traditional cooking equipment 100 includes a magnet, which enhances the converging ability of the magnetic fields generated by the first excitation coil 22 and the second excitation coil 32, thereby increasing the magnetic field strength acting on the cooking pot 10 and improving the cooking performance of the cooking equipment 100. However, including a magnet not only increases the number of parts and assembly steps in the cooking equipment 100, thus increasing production costs, but also interacts with a portion of the magnetic field generated by the excitation coil winding, causing eddy currents to be induced in the magnet, resulting in energy loss and reducing energy conversion efficiency. Furthermore, eddy currents cause the magnet temperature to rise, thereby reducing the magnet's ability to suppress magnetic leakage and affecting the reliability of the cooking equipment 100.

[0092] The cooking device 100 of this utility model embodiment, by setting a partially overlapping first excitation coil 22 and second excitation coil 32 on the bottom wall 11 of the cooking pot 10, can enhance the magnetic field strength acting on the cooking pot 10 without using a magnet, improve the heating performance of the cooking device 100, thereby reducing the number of parts of the cooking device 100, simplifying the manufacturing process, improving production efficiency, reducing production costs, and realizing the lightweight design of the cooking device 100.

[0093] In the description of this utility model, it should be understood that the terms "upper", "lower", "horizontal", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0094] In the description of this utility model, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0095] Other configurations and operations of the cooking apparatus 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0096] 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 the present invention. 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.

[0097] Although embodiments of the present invention 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 the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cooking device, characterized in that, include: Cooking pot; The first heating device includes a first coil support and a first excitation coil. The first excitation coil is mounted on the first coil support and is disposed opposite to the bottom wall of the cooking pot, for heating the bottom wall of the cooking pot. The second heating device includes a second coil support and a second excitation coil. The second excitation coil is mounted on the second coil support and is disposed opposite to the bottom wall of the cooking pot, for heating the bottom wall of the cooking pot. The first coil support is located on the side of the second coil support away from the cooking pot, and defines a receiving cavity between the first coil support and the second coil support. The second excitation coil is located in the receiving cavity. The first coil support includes a first support plate and a first enclosure plate. The first support plate is disposed opposite to the bottom wall of the cooking pot. The first enclosure plate extends circumferentially along the first support plate and is connected to the side of the first support plate facing the second coil support. The end of the first enclosure plate away from the first support plate has an air guide structure for guiding airflow into the receiving cavity.

2. The cooking apparatus according to claim 1, characterized in that, The air guiding structure includes an air guiding groove with the opening of the air guiding groove facing upward. The circumferential dimension of the air guiding groove in the first enclosure gradually decreases from top to bottom.

3. The cooking apparatus according to claim 2, characterized in that, The air guide duct has a first duct sidewall and a second duct sidewall that are arranged circumferentially opposite to each other in the first enclosure. Each of the first groove sidewall and the second groove sidewall includes a first extension segment and a second extension segment. The upper end of the second extension segment is connected to the lower end of the first extension segment. Both the second extension segment of the first groove sidewall and the second extension segment of the second groove sidewall are arc-shaped structures and are bent in opposite directions.

4. The cooking apparatus according to claim 2, characterized in that, The first enclosure includes a plurality of air guide plates, which are arranged circumferentially on the first support plate. The size of each air guide plate in the circumferential direction of the first support plate gradually decreases from bottom to top, so as to define the air guide groove between any two adjacent air guide plates. Wherein, each of the air guide plates is an arc-shaped plate extending circumferentially along the first support plate, and the arc-shaped plate gradually moves away from the central axis of the cooking pot from bottom to top; and / or, The tangent of each of the air guide plates on the side edge away from the first support plate forms an angle with a horizontal plane, which is perpendicular to the central axis of the cooking pot. The angle decreases and then increases from one end of the edge to the other.

5. The cooking apparatus according to claim 2, characterized in that, The depth of the air guide groove in the height direction of the cooking pot is 5mm-30mm.

6. The cooking apparatus according to claim 2, characterized in that, The second heating device further includes a third excitation coil, which is mounted on the second coil bracket and is disposed opposite to the peripheral wall of the cooking pot, for heating the peripheral wall of the cooking pot; The third excitation coil includes multiple coil segments, which are wound from bottom to top along the height direction of the cooking pot.

7. The cooking apparatus according to claim 6, characterized in that, The air guide duct has a first duct sidewall and a second duct sidewall that are arranged circumferentially opposite to each other in the first enclosure. The upper ends of the first and second groove sidewalls are configured such that they are higher than the second coil segment from bottom to top and lower than the middle of the third excitation coil in the height direction of the cooking pot; and / or, The lower ends of the first groove sidewall and the second groove sidewall are configured such that they are 10 mm above the first coil segment from bottom to top and 10 mm below the first coil segment from bottom to top.

8. The cooking apparatus according to claim 2, characterized in that, The air guide trough has a first trough sidewall and a second trough sidewall arranged circumferentially opposite to each other in the first enclosure; a plane perpendicular to the central axis of the cooking pot is a first plane, the projection of the intersection point of the first trough sidewall and the second trough sidewall near each other on the first plane is a first projection point, and the projection of the central axis of the cooking pot on the first plane is a second projection point. The plane perpendicular to the line connecting the first projection point and the second projection point is the second plane, and the angle between the tangent of the projection of the first groove sidewall onto the second plane and the tangent of the projection of the second groove sidewall onto the second plane is 30°-180°.

9. The cooking apparatus according to claim 1, characterized in that, The first coil support has an air vent in the middle, and the air vent connects the receiving cavity and the lower space of the first coil support; The cooking device further includes a cooling fan disposed around the periphery of the first coil support and the second coil support, for driving airflow to form an airflow so that at least part of the airflow enters the receiving cavity and exits from the air vent; and / or, The cross-section of the receiving cavity passing through the central axis of the cooking pot shows a trend of first decreasing and then increasing from the outer periphery of the first coil support towards the air vent, with the second excitation coil located in the region of increased cross-section of the receiving cavity; and / or, The first coil support has multiple ventilation openings at a position opposite to the first excitation coil. The ventilation openings connect the receiving cavity and the lower space of the first coil support. The multiple ventilation openings are arranged circumferentially on the first excitation coil. The first excitation coil is limited on the first coil support by multiple limiting members, and the positions of the multiple limiting members correspond one-to-one with the positions of the multiple ventilation openings.

10. The cooking apparatus according to claim 1, characterized in that, In a plane perpendicular to the central axis of the cooking pot, the projection of the first excitation coil partially overlaps with the projection of the second excitation coil.

11. The cooking apparatus according to claim 10, characterized in that, The number of first excitation coils is multiple, and the multiple first excitation coils are arranged circumferentially in an imaginary circle. The center of the imaginary circle is located on the central axis of the cooking pot, and the imaginary circle is located on a plane perpendicular to the central axis of the cooking pot. The center points of the plurality of first excitation coils are located on a virtual ring, the center of the second excitation coil and the center of the virtual ring are both located on the central axis of the cooking pot, and the outer circumference of the second excitation coil is not greater than the outer circumference of the virtual ring.

12. The cooking apparatus according to claim 1, characterized in that, The second heating device further includes a third excitation coil, which is mounted on the second coil bracket and is disposed opposite to the peripheral wall of the cooking pot, for heating the peripheral wall of the cooking pot; In a plane perpendicular to the central axis of the cooking pot, the projection of the third excitation coil partially overlaps with the projection of the first excitation coil.

13. The cooking apparatus according to claim 12, characterized in that, The current direction of the second excitation coil and the third excitation coil is the same at the same time point, and the current direction of the second excitation coil / the third excitation coil is the same as or opposite to that of the first excitation coil at the same time point.

14. The cooking apparatus according to any one of claims 1-13, characterized in that, The cooking device also includes a base, the cooking pot is disposed above the base, the base has an installation area, the first excitation coil is located between the cooking pot and the installation area, and the installation area is disposed opposite to the first excitation coil; Wherein, the first excitation coil is located on the side of the first coil bracket opposite to the second coil bracket, and no magnet is placed between the mounting area and the first excitation coil; and / or, The second excitation coil is located between the cooking pot and the mounting area, and the mounting area is also arranged opposite to the second excitation coil, and no magnet is arranged between the mounting area and the second excitation coil.

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