Cooking apparatus

Abstract

The utility model discloses a kind of cooking equipment, cooking equipment includes cooking main body and cover body subassembly, cooking main body includes base, cooking pot and heating device, heating device includes first excitation coil, base has the installation area of first excitation coil, first excitation coil is located between installation area and the bottom wall of cooking pot, magnet is not set between first excitation coil and installation area, first excitation coil is circular structure and suitable for generating magnetic field under energized state, magnetic field intensity on the same diameter imaginary circle of magnetic field is equal. According to the cooking equipment of the utility model embodiment, by optimizing the magnetic field distribution of first excitation coil, can reduce the magnetic flux leakage phenomenon in the case where magnet is not set, on the basis of guaranteeing heating effect, can reduce the number of components, simplify manufacturing process, improve production efficiency, reduce production cost, realize the lightweight design of cooking equipment.

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, the electromagnetic heating device of cooking equipment includes a coil and a magnet. Although it can achieve electromagnetic heating, the large number of components leads to complex production steps and increased costs. Furthermore, the manufacture of the magnet involves high energy consumption and environmental pollution, which does not conform to the trend of green manufacturing. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a cooking device with fewer components, which simplifies production steps, improves production efficiency, reduces production costs, and facilitates lightweight design.

[0004] The cooking device according to an embodiment of the present invention includes: a cooking body, comprising a base, a cooking pot, and a heating device, wherein the cooking pot is disposed above the base, the heating device is used to heat the cooking pot, and includes a first excitation coil; and a lid assembly disposed on the cooking body for opening and closing the opening of the cooking pot; wherein the base has an installation area for the first excitation coil, the first excitation coil is located between the installation area and the bottom wall of the cooking pot, no magnet is disposed between the first excitation coil and the installation area, the first excitation coil has a circular structure and is adapted to generate a magnetic field when energized, the magnetic field strength is equal on an imaginary circle of the same diameter, the center of the imaginary circle is located on the central axis of the first excitation coil, and the imaginary circle is located on a plane perpendicular to the central axis.

[0005] According to the cooking device of this utility model embodiment, by optimizing the magnetic field distribution of the first excitation coil, the magnetic leakage phenomenon can be reduced without setting a magnet. While ensuring the heating effect of the heating device on the cooking pot, the number of parts can be reduced, the manufacturing process can be simplified, the production efficiency can be improved, the production cost can be reduced, and the lightweight design of the cooking device can be achieved. In addition, the cooking device of this utility model embodiment can also reduce the energy loss caused by the interaction between the magnet and a part of the magnetic field, and avoid the magnet heating up from affecting the reliability of the cooking device.

[0006] According to some embodiments of the present invention, the magnetic field has an annular equimagnetic region in a plane perpendicular to the height direction of the cooking pot, and the center of the annular equimagnetic region is located on the central axis of the first excitation coil.

[0007] In some embodiments, the vertical magnetic induction intensity deviation of the annular isomagnetic region is a, -0.1≤a≤0.1.

[0008] In some embodiments, the effective diameter of the first excitation coil is D, the radial dimension of the annular equimagnetic region is W, and the ratio of W to D is greater than or equal to 0.05.

[0009] According to some embodiments of the present invention, the first excitation coil is wound from the inside to the outside in the radial direction of the imaginary circle and includes a plurality of first coil segments; wherein, the cooking body further includes a support member, the support member is disposed above the base and defines a receiving cavity, the cooking pot is disposed in the receiving cavity, the support member has a plurality of mounting slots on the side facing the base, and the plurality of first coil segments are embedded in the plurality of mounting slots.

[0010] In some embodiments, the wall of the mounting groove has a hot-pressed deformation portion that presses against the first coil segment to confine the first coil segment within the mounting groove.

[0011] According to some embodiments of the present invention, the cooking device further includes a magnetic shielding component, which is disposed between the first excitation coil and the mounting area. The magnetic shielding component is disc-shaped, and the center of the magnetic shielding component is located on the central axis of the first excitation coil; or, no magnetic shielding component is disposed between the first excitation coil and the mounting area.

[0012] According to some embodiments of the present invention, the heating device further includes a second excitation coil, which is positioned corresponding to the peripheral wall of the cooking pot and is coiled from bottom to top along the height direction of the cooking pot.

[0013] In some embodiments, the cooking body includes: a support member disposed above the base and defining a receiving cavity, wherein the cooking pot is disposed in the receiving cavity; and a shell sleeved on the outside of the support member and having its lower end connected to the base; wherein the first excitation coil is disposed on the side of the support member facing the base, and the second excitation coil is disposed on the side of the support member facing the shell.

[0014] In some examples, the support includes a heating plate bracket and a mounting cylinder. The mounting cylinder has openings at both its upper and lower ends. The lower end of the mounting cylinder is connected to the heating plate bracket, and the upper end is connected to the outer casing. The mounting cylinder and the heating plate bracket together define the receiving cavity. The heating plate bracket includes a horizontal extension and an arcuate extension. The horizontal extension is disposed opposite to the mounting area, and the arcuate extension is connected between the horizontal extension and the lower end of the mounting cylinder. The first excitation coil is disposed on the side of the horizontal extension away from the receiving cavity, and the second excitation coil is disposed on the side of the arcuate extension away from the receiving cavity.

[0015] In some specific examples, the portion of the housing opposite to the second excitation coil is not provided with a magnet between it and the second excitation coil.

[0016] In some examples, the cooking body also includes a circuit board assembly that is placed upright around the periphery of the cooking pot and located between the support and the outer shell.

[0017] According to some embodiments of the present invention, the cooking device is a rice cooker or a pressure cooker; and / or, the heating power of the cooking device is less than 1500W.

[0018] 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

[0019] 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 perspective view of a cooking device according to an embodiment of the present utility model; Figure 2 This is a structural cross-sectional view of the cooking device according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the structure of the heating device on the support member according to some embodiments of the present utility model; Figure 4 yes Figure 3 A three-dimensional view of the structure shown; Figure 5 yes Figure 3 A simulation diagram of the heating device shown; Figure 6 This is a schematic diagram of the structure of a heating device according to other embodiments of the present invention; Figure 7 yes Figure 6 Enlarged view of part A in the image; Figure 8 This is an exploded structural view of a cooking device according to an embodiment of the present utility model; Figure 9 This is another exploded view of the cooking device according to an embodiment of the present utility model.

[0020] Figure label: 100 cooking equipment; Cooking Main Body 10, Base 11; Mounting area 11a; Cooking pot 12; pot opening 12a; bottom wall 121; peripheral wall 122; Heating device 13; First excitation coil 131; First annular magnetic region 131a; Annular equimagnetic region 131b; Second annular magnetic region 131c; Coil group 1311; First coil segment 13111; Second excitation coil 132; Second coil segment 1321; Support member 14; receiving cavity 14a; mounting groove 14b; limiting member 14b1; heating plate bracket 141; horizontal extension 1411; arc-shaped extension 1412; mounting cylinder 142; opening 142a; Casing 15; Circuit board assembly 16; Cover assembly 20; magnetic shielding component 30. Detailed Implementation

[0021] 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.

[0022] The following is for reference. Figures 1-9 A cooking apparatus 100 according to an embodiment of the present utility model is described.

[0023] like Figure 1 and Figure 2 As shown, the cooking device 100 according to an embodiment of the present invention includes a cooking body 10 and a lid assembly 20.

[0024] The cooking body 10 includes a base 11, a cooking pot 12 and a heating device 13. The cooking pot 12 is located above the base 11, and the heating device 13 is used to heat the cooking pot 12. The lid assembly 20 is located on the cooking body 10 and is used to open and close the pot opening 12a of the cooking pot 12.

[0025] The heating device 13 includes a first excitation coil 131, and the base 11 has an installation area 11a for the first excitation coil 131. The first excitation coil 131 is located between the installation area 11a and the bottom wall 121 of the cooking pot 12. No magnet is provided between the first excitation coil 131 and the installation area 11a.

[0026] Here, "installation area 11a" refers to the area where the projection of the first excitation coil 131 is located on the plane of the base 11.

[0027] Specifically, when the cooking device 100 is working, a high-frequency alternating current is passed through the first excitation coil 131. The first excitation coil 131 generates a magnetic field through electromagnetic induction. The magnetic field acts on the cooking pot 12, causing the cooking pot 12 to induce eddy currents and directly generate heat. Compared with traditional open flame or resistance heating methods, electromagnetic heating significantly improves thermal efficiency.

[0028] With the plane where the first excitation coil 131 is located as the reference plane, after the first excitation coil 131 is supplied with alternating current, a symmetrically distributed magnetic field will be generated above and below the reference plane, and the magnetic field strength above and below the reference plane is equal. Since the first excitation coil 131 is located between the installation area 11a and the bottom wall 121 of the cooking pot 12, the magnetic field above the reference plane, that is, the magnetic field near the bottom wall 121 of the cooking pot 12, can act on the cooking pot 12, causing the cooking pot 12 to induce eddy currents and directly heat up. However, the magnetic field below the reference plane will not act on the cooking pot 12, that is, a magnetic leakage phenomenon will occur, which may have a potential impact on other components of the base 11 of the cooking device 100 or human health.

[0029] In the design of a conventional cooking device 100, a magnet (such as ferrite) is typically placed between the first excitation coil 131 and the mounting area 11a. This serves two purposes: firstly, it enhances the magnetic field coupling efficiency, improving the heating performance of the first excitation coil 131; secondly, it suppresses magnetic field leakage at the bottom of the first excitation coil 131, preventing potential impacts on surrounding electronic equipment or human health. However, placing a magnet not only increases the number of components and assembly steps in the cooking device 100, thus increasing production costs, but it also interacts with a portion of the magnetic field generated by the first excitation coil 131, inducing eddy currents in the magnet, causing energy loss and reducing energy conversion efficiency. Furthermore, eddy currents cause the magnet temperature to rise, further reducing its ability to suppress magnetic leakage and affecting the reliability of the cooking device 100.

[0030] Therefore, in order to avoid the problems caused by setting up a magnet, this utility model adopts a scheme to optimize the magnetic field distribution of the first excitation coil 131. Specifically, the first excitation coil 131 is set as a circular structure. The first excitation coil 131 is suitable for generating a magnetic field when energized. In this way, the magnetic field strength on the imaginary circle of the same diameter is equal. The center of the imaginary circle is located on the central axis of the first excitation coil 131, and the imaginary circle is on a plane perpendicular to the central axis. This can promote magnetic field coupling and reduce magnetic leakage.

[0031] For example, the first excitation coil 131 can be wound from the inside to the outside in the radial direction of the imaginary circle to form a complete circular structure, or it can be wound from the inside to the outside in the radial direction of the imaginary circle to form a ring structure.

[0032] According to the embodiment of the present invention, the cooking device 100 can reduce magnetic leakage without setting a magnet by optimizing the magnetic field distribution of the first excitation coil 131. While ensuring the heating effect of the heating device 13 on the cooking pot 12, it can reduce the number of parts, simplify the manufacturing process, improve production efficiency, reduce production costs, and achieve a lightweight design of the cooking device 100. In addition, the cooking device 100 of the present invention can also reduce the energy loss caused by the interaction between the magnet and a part of the magnetic field, and avoid the magnet heating up from affecting the reliability of the cooking device 100.

[0033] For example, the manufacturing process of magnets (such as ferrites) is energy-intensive and involves polluting raw materials such as heavy metals. Using a solution that does not include magnets is in line with the requirements of green manufacturing and sustainable development.

[0034] Reference Figures 2-5 According to some embodiments of the present invention, the magnetic field has an annular equimagnetic region 131b in a plane perpendicular to the height direction of the cooking pot 12, and the center of the annular equimagnetic region 131b is located on the central axis of the first excitation coil 131.

[0035] Here, "ring-shaped equimagnetic region 131b" refers to a continuous ring-shaped equimagnetic region that is concentric with the routing of the first excitation coil 131.

[0036] In a heating scheme with a magnet, the first excitation coil 131 will generate a discontinuous blocky high magnetic energy accumulation area, which will lead to local accumulation of magnetic field energy. Although it can enhance the rolling effect when cooking with a large amount of water, it will reduce the uniformity of the heat field when cooking with a small amount of water (such as cooking rice), which will easily lead to uneven heating of rice and inconsistent taste.

[0037] Based on this solution, the cooking device 100 of this utility model embodiment eliminates the magnet and the magnet support structure, and optimizes the magnetic field distribution of the first excitation coil 131, so that the first excitation coil 131 generates a continuous annular equimagnetic region concentric with the first excitation coil 131. This not only reduces the number of parts of the cooking device 100 and the assembly steps during production, but also utilizes the continuous annular equimagnetic region concentric with the first excitation coil 131 to heat the cooking pot 12 evenly, improving the cooking uniformity of small-volume ingredients. Especially for ingredients that require even heating (such as rice), this can significantly improve the heating uniformity of rice and other ingredients, resulting in a better taste.

[0038] In the above technical solution, by setting the magnetic field to include an annular equal magnetic region 131b in a plane perpendicular to the height direction of the cooking pot 12, and placing the center of the annular equal magnetic region 131b on the central axis of the first excitation coil 131, the heating intensity of the magnetic field of the first excitation coil 131 can be guaranteed and the magnetic field leakage can be reduced. Thus, the annular equal magnetic region 131b is used to heat the cooking pot 12 evenly, so that the food in the cooking pot 12 is heated evenly, which significantly improves the cooking effect of the cooking device 100.

[0039] Reference Figure 5 In some embodiments, the vertical magnetic induction intensity deviation of the annular isomagnetic region 131b is a, -0.1≤a≤0.1.

[0040] It should be noted that the "vertical magnetic induction intensity deviation of the annular isomagnetic region 131b" refers to the difference between the magnetic signal in the direction perpendicular to the bottom wall 121 of the cooking pot 12 within the annular isomagnetic region 131b and the expected target value or average value. Specifically, the single-point deviation is |Bzi-Bzavg| / Bzavg×100%. In other words, the magnetic induction intensity deviation of the annular isomagnetic region 131b in the direction perpendicular to the bottom wall 121 of the cooking pot 12 reflects the uniformity of the magnetic field in the annular isomagnetic region 131b.

[0041] By setting the vertical magnetic induction intensity of the annular equal magnetic region 131b between -0.1 and 0.1, the magnetic field of the annular equal magnetic region 131b is made more uniform, and the magnetic field of the annular equal magnetic region 131b can act uniformly on the cooking pot 12 to heat the food in the cooking pot 12 evenly.

[0042] Reference Figure 3 and Figure 5 In some embodiments, the effective diameter of the first excitation coil 131 is D, which is the maximum diameter of the first excitation coil 131, and the radial dimension of the annular equimagnetic region 131b is W, where the ratio of W to D is greater than or equal to 0.05. For example, the ratio of W to D can be 0.05, 0.06, etc.

[0043] This configuration ensures that the magnetic field on the annular isomagnetic region 131b is continuous and uninterrupted. When the magnetic field in the annular isomagnetic region 131b acts on the cooking pot 12, it can heat the food in the cooking pot 12 evenly. Especially when cooking with a small amount of water, it can significantly improve the heating uniformity of ingredients such as rice.

[0044] Reference Figure 5 In some embodiments, the magnetic field also has a first annular magnetic region 131a and a second annular magnetic region 131c in the plane, with the second annular magnetic region 131c located outside the first annular magnetic region 131a.

[0045] Among them, the annular magnetic region 131b is located between the first annular magnetic region 131a and the second annular magnetic region 131c, and the vertical induction intensity of the first annular magnetic region 131a and the vertical induction intensity of the second annular magnetic region 131c are both less than the vertical induction intensity of the annular magnetic region 131b.

[0046] In the above technical solution, by setting the magnetic field to have a first annular magnetic region 131a and a second annular magnetic region 131c in a plane perpendicular to the height direction of the cooking pot 12, the heating area of ​​the first excitation coil 131 on the cooking pot 12 can be increased, which is beneficial to improving the cooking speed.

[0047] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, the first excitation coil 131 is wound from the inside to the outside in the radial direction of an imaginary circle, and the first excitation coil 131 includes a plurality of first coil segments 13111.

[0048] When the cooking device 100 is working, a high-frequency current is passed through the first excitation coil 131, which causes electromagnetic induction to occur in the multiple first coil segments 13111 of the first excitation coil 131, generating a magnetic field. The magnetic fields generated by the multiple first coil segments 13111 are superimposed and act on the cooking pot 12, causing the cooking pot 12 to induce eddy currents and generate heat, thereby realizing the heating of the cooking pot 12 by the first excitation coil 131.

[0049] The cooking body 10 also includes a support member 14, which is located above the base 11 and defines a receiving cavity 14a. The cooking pot 12 is located in the receiving cavity 14a. The support member 14 has multiple mounting slots 14b on the side facing the base 11, and multiple first coil segments 13111 are embedded in the multiple mounting slots 14b.

[0050] In the above technical solution, by setting the first excitation coil 131 to include the first coil segment 13111, the magnetic field generated by the multiple first coil segments 13111 can be coupled after the first coil segment 13111 is energized, which can improve the heating efficiency of the first excitation coil 131; by setting the cooking body 10 to include the support member 14, the support member 14 defines the receiving cavity 14a, which can provide an installation position for the cooking pot 12; by providing multiple mounting slots 14b on the side of the support member 14 facing the base 11, the multiple first coil segments 13111 can be embedded in the multiple mounting slots 14b, so as to fix the multiple first coil segments 13111, and prevent the multiple first coil segments 13111 from leaving the preset position during the use of the cooking device 100, which would cause the magnetic field acting on the bottom wall 121 of the cooking pot 12 to change, and ultimately cause the temperature of the bottom wall 121 of the cooking pot 12 to be uneven.

[0051] For example, the mounting groove 14b is provided with a limiting member 14b1 to limit the first coil segment 13111 embedded in the mounting groove 14b and prevent the first coil segment 13111 from falling out of the mounting groove 14b.

[0052] Reference Figures 3-4 In some embodiments, the wall of the mounting groove 14b has a hot-pressed deformation portion (not shown in the figure) that presses against the first coil segment 13111 to confine the first coil segment 13111 within the mounting groove 14b.

[0053] In other words, the first coil segment 13111 can be fixedly installed using a hot pressing process. For example, the hot pressing temperature can be set to above 200℃, the pressure to above 0.8 MPa, and the holding time to above 2 seconds. This ensures that the wall of the mounting groove 14b softens and deforms to fill the gap of the first coil segment 13111 and press against the first coil segment 13111, thereby fixing the first coil segment 13111 to the mounting groove 14b.

[0054] Therefore, by using a hot-pressing process to fix the first coil segment 13111 to the mounting groove 14b, the assembly steps are simplified, the installation reliability of the first coil segment 13111 is improved, and the separate fixing structure required in related technologies is eliminated, reducing production costs. Furthermore, compared with related technologies, in this embodiment, there is no need to provide a screw mounting structure or fixing clip on the side of the support member 14 facing the base 11, simplifying the structure of the support member 14.

[0055] Reference Figure 3 In some embodiments, a plurality of first coil segments 13111 are evenly arranged in the radial direction of an imaginary circle, and the plurality of first coil segments 13111 are connected end to end.

[0056] Reference Figure 6 In other embodiments, the plurality of first coil segments 13111 are divided into a plurality of coil groups 1311, which are arranged at intervals in the radial direction of an imaginary circle. In the description of this utility model, "a plurality of" means two or more. The spacing L1 between two adjacent coil groups 1311 is greater than 12 mm. For example, the spacing L1 between two adjacent coil groups 1311 can be 12 mm, 15 mm, 20 mm, 25 mm, etc.

[0057] Therefore, by optimizing the structure of the first excitation coil 131, that is, by setting the first excitation coil 131 to include multiple coil groups 1311, multiple annular equimagnetic regions 131b can be formed. The coil groups 1311 are arranged at intervals in the radial direction of an imaginary circle, and the spacing between two adjacent coil groups 1311 is increased to be greater than 12mm, the degree of concentrated distribution of magnetic field lines can be further reduced, the magnetic field generated by the first excitation coil 131 can be weakened, and the leakage magnetic phenomenon can be reduced.

[0058] In some embodiments, the plurality of coil groups 1311 are arranged at equal intervals in the radial direction of the imaginary circle; or, in the plurality of coil groups 1311, the spacing between two adjacent coil groups 1311 gradually decreases from the inside to the outside in the radial direction of the imaginary circle. This arrangement ensures that the magnetic field generated by the first excitation coil 131 is evenly distributed, thereby evenly dispersing the eddy currents acting on the cooking pot 12, which can make the temperature of the cooking pot 12 more uniform. For rice cookers that require a uniform heat field for cooking rice, this can effectively improve the cooking performance.

[0059] For example, multiple coil groups 1311 are arranged radially in an imaginary circle, wherein the spacing between two adjacent coil groups 1311 gradually decreases from the inside to the outside of the imaginary circle. This arrangement makes the magnetic field generated by the first excitation coil 131 more dispersed, avoiding an excessively strong magnetic field in the central region of the bottom wall 121 of the cooking pot 12, which could cause the temperature in the central region of the bottom wall 121 to become too high.

[0060] In some examples, among the multiple coil groups 1311, the projection of the outer coil group 1311 onto the bottom wall 121 of the cooking pot 12 is a circular area.

[0061] The diameter of the outer contour line of the annular region is greater than or equal to 140 mm. For example, the diameter of the outer contour line of the annular region can be 140 mm, 150 mm, 160 mm, etc.

[0062] And / or, the ratio of the area enclosed by the outer contour of the annular region to the surface area of ​​the bottom wall 121 of the cooking pot 12 is greater than or equal to 2 / 3. For example, the ratio of the area enclosed by the outer contour of the annular region to the surface area of ​​the bottom wall 121 of the cooking pot 12 can be 2 / 3, 3 / 4, etc.

[0063] This configuration allows the magnetic field generated by the multiple coil groups 1311 after being energized to act on a larger area of ​​the bottom wall 121 of the cooking pot 12, so that the bottom wall 121 of the cooking pot 12 can generate eddy currents under the action of the magnetic field, thereby achieving uniform heating of the bottom wall 121 and avoiding the situation where the area of ​​the magnetic field acting on the bottom wall 121 is too small, which would lead to a decrease in heating efficiency.

[0064] In some specific examples, each coil group 1311 includes a plurality of first coil segments 13111, which are at least partially arranged radially in an imaginary circle. In the description of this utility model, "a plurality of" means two or more.

[0065] Reference Figure 6 and Figure 7 In some specific examples, the radial distance between two adjacent coil groups 1311 in the imaginary circle is L1, and the radial distance between two adjacent first coil segments 13111 in the imaginary circle in a single coil group 1311 is L2, with the ratio of L1 to L2 being greater than 5. For example, the ratio of L1 to L2 can be 6, 8, 9, 10, etc.

[0066] In the above technical solution, by setting the ratio of L1 to L2 to be greater than 5, that is, by setting the radial spacing of two adjacent first coil segments 13111 in a single coil group 1311 in the imaginary circle to be small, and setting the radial spacing of two adjacent coil groups 1311 in the imaginary circle to be large, the degree of magnetic field concentration distribution can be reduced to a certain extent, the leakage magnetic field of the coil group 1311 can be reduced, and the heating efficiency of the cooking device 100 can also be guaranteed.

[0067] Reference Figure 3 , Figure 8 and Figure 9 According to some embodiments of the present invention, the cooking device 100 further includes a magnetic shielding component 30, which is disposed between the first excitation coil 131 and the mounting area 11a.

[0068] Specifically, since the first excitation coil 131 is located between the installation area 11a and the cooking pot 12, when the first excitation coil 131 is energized, part of the magnetic field generated by the first excitation coil 131 through electromagnetic induction is located on the side where the cooking pot 12 is located, and the other part is located on the side away from the cooking pot 12. Therefore, the bottom wall 121 of the cooking pot 12 will have the problem of magnetic field leakage. By placing the magnetic shielding component 30 between the first excitation coil 131 and the installation area 11a, the magnetic field strength of the side of the first excitation coil 131 away from the cooking pot 12 can be weakened, thereby reducing the risk of magnetic leakage.

[0069] Therefore, in the above technical solution, since the cooking device 100 of this utility model has optimized the magnetic field distribution of the first excitation coil 131 and alleviated the magnetic leakage phenomenon, a magnetic shielding component 30 can be provided between the first excitation coil 131 and the installation area 11a to further reduce the magnetic leakage phenomenon.

[0070] In some embodiments, the magnetic shielding element 30 is disc-shaped, and the center of the magnetic shielding element 30 is located on the central axis of the first excitation coil 131, which further weakens the magnetic field strength of the first excitation coil 131 on the side away from the cooking pot 12, thereby further reducing the risk of magnetic leakage.

[0071] According to some other embodiments of the present invention, no magnetic shielding element 30 is provided between the first excitation coil 131 and the mounting area 11a.

[0072] Since the magnetic field distribution of the first excitation coil 131 in the cooking device 100 of this utility model embodiment has been optimized, magnetic leakage can be suppressed without using the magnetic shielding component 30. Therefore, the magnetic shielding component 30 does not need to be provided between the first excitation coil 131 and the mounting area 11a, thereby reducing the number of components and assembly steps of the cooking device 100, reducing production costs, and reducing the weight of the cooking device 100 without the magnetic shielding component 30, which is conducive to the portable design of the cooking device 100.

[0073] Reference Figure 4 , Figure 8 and Figure 9 According to some embodiments of the present invention, the heating device 13 further includes a second excitation coil 132, which corresponds to the position of the peripheral wall 122 of the cooking pot 12, and is coiled from bottom to top along the height direction of the cooking pot 12.

[0074] For example, in a cooking appliance 100 with a large cooking pot 12, such as a rice cooker, there is often a lot of food in the cooking pot 12. If the food is heated only by the first excitation coil 131 of the bottom wall 121 of the cooking pot 12, the food near the bottom wall 121 can be heated evenly, but the food far from the bottom of the cooking pot 12 cannot be heated evenly, so the cooking performance of the cooking appliance 100 cannot meet the requirements.

[0075] For example, the second excitation coil 132 includes a plurality of second coil segments 1321 connected end to end.

[0076] Therefore, in the above technical solution, by setting the second excitation coil 132 at the corresponding position on the peripheral wall 122 of the cooking pot 12, the peripheral wall 122 of the cooking pot 12 can be heated by the second excitation coil 132, thereby heating the food in the cooking pot 12 evenly; by setting the second electromagnetic heating device 13 to include a plurality of second coil segments 1321, and arranging at least a portion of each second coil segment 1321 along the height direction of the cooking pot 12, the magnetic fields generated by the plurality of second coil segments 1321 can be superimposed after the plurality of second coil segments 1321 are energized, thereby increasing the magnetic field strength and improving the heating effect of the second excitation coil 132 on the peripheral wall 122 of the cooking pot 12.

[0077] Reference Figure 8 and Figure 9 In some embodiments, the cooking body 10 includes a support 14 disposed above the base 11, the support 14 defining a receiving cavity 14a, and the cooking pot 12 disposed in the receiving cavity 14a.

[0078] The cooking body 10 also includes a shell 15, which is fitted onto the outside of the support 14, and the lower end of the shell 15 is connected to the base 11.

[0079] The first excitation coil 131 is located on the side of the support member 14 facing the base 11, and the second excitation coil 132 is located on the side of the support member 14 facing the outer shell 15.

[0080] In the above technical solution, by placing the support member 14 above the base 11, on the one hand, a receiving cavity 14a can be defined to place the cooking pot 12, and on the other hand, it can serve as a mounting carrier for the first excitation coil 131 and the second excitation coil 132, so as to prevent the first excitation coil 131 and the second excitation coil 132 from leaving the preset position and affecting the cooking performance of the cooking device 100.

[0081] In addition, the outer shell 15 is connected to the base 11 to form the external structure of the cooking device 100, which can protect the internal structure and protect components such as the support member 14 and the heating device 13.

[0082] Reference Figure 2 and further refer to Figure 8 and Figure 9 In some examples, the support 14 includes a heating plate bracket 141 and a mounting cylinder 142. The mounting cylinder 142 has openings 142a at both its upper and lower ends. The lower end of the mounting cylinder 142 is connected to the heating plate bracket 141, and the upper end is connected to the outer casing 15. The mounting cylinder 142 and the heating plate bracket 141 together define a receiving cavity 14a. Therefore, when using the cooking appliance 100, the user can remove the cooking pot 12 from the receiving cavity 14a through the upper opening 142a; or place the cooking pot 12 into the receiving cavity 14a through the upper opening 142a.

[0083] The heating plate bracket 141 includes a horizontal extension 1411 and an arc-shaped extension 1412. The horizontal extension 1411 is disposed opposite to the mounting area 11a. The arc-shaped extension 1412 is connected between the lower end of the horizontal extension 1411 and the mounting cylinder 142. The first excitation coil 131 is disposed on the side of the horizontal extension 1411 away from the receiving cavity 14a, and the second excitation coil 132 is disposed on the side of the arc-shaped extension 1412 away from the receiving cavity 14a.

[0084] This configuration provides a mounting carrier for the first excitation coil 131 and the second excitation coil 132, allowing the first excitation coil 131 to heat the bottom wall 121 of the cooking pot 12 and the second excitation coil 132 to heat the peripheral wall 122 of the cooking pot 12, which helps to improve the cooking performance of the cooking equipment 100.

[0085] Reference Figure 4 , Figure 8 and Figure 9 In some specific examples, the portion of the housing 15 opposite to the second excitation coil 132 does not have a magnet between it and the second excitation coil 132.

[0086] For example, the second heating excitation coil is positioned corresponding to the peripheral wall 122 of the cooking pot 12. When the second excitation coil 132 experiences magnetic leakage, the leaked magnetic field will not affect other components of the cooking device 100, thus not impacting them. Meanwhile, the magnetic field leaked by the second excitation coil 132 may interact with the magnetic field generated by the first excitation coil 131, weakening the leaked magnetic field. Therefore, no magnet needs to be provided between the outer shell 15 and the second excitation coil 132.

[0087] In the above technical solution, the portion of the outer shell 15 opposite to the second excitation coil 132 does not have a magnet between it and the second excitation coil 132, which can reduce the number of parts of the cooking equipment 100 and the assembly steps during production, thereby reducing production costs.

[0088] Reference Figure 2 In some examples, the cooking body 10 also includes a circuit board assembly 16, which is placed upright on the periphery of the cooking pot 12 and is located between the support 14 and the housing 15.

[0089] This arrangement allows the circuit board assembly 16 to be kept as far away from the first excitation coil 131 as possible, preventing the first excitation coil 131 from interfering with the circuit board assembly 16 or even damaging the circuit board assembly 16. On the other hand, it can improve the space utilization between the support member 14 and the housing 15.

[0090] Reference Figure 1 According to some embodiments of the present invention, the cooking device 100 is a rice cooker or a pressure cooker.

[0091] In this way, on the one hand, the heating device 13 can be used to heat the food in the rice cooker or pressure cooker more evenly, effectively improving the cooking performance of the rice cooker or pressure cooker. On the other hand, it can improve the production efficiency of the rice cooker or pressure cooker, reduce the production cost of the rice cooker or pressure cooker, and achieve a lightweight design of the rice cooker or pressure cooker.

[0092] According to some embodiments of the present invention, the heating power of the cooking device 100 is less than 1500W. While ensuring heating efficiency, the magnetic field strength of the first excitation coil 131 on a plane perpendicular to the height direction of the cooking pot 12 per unit area can be reduced. This can reduce the risk of the base 11 of the cooking device 100 melting when the cooking device 100 is placed on a metal rack or stacked with other devices, thereby improving the durability of the cooking device 100.

[0093] In the description of this utility model, it should be understood that the terms "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "radial", "circumferential", 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: The cooking body includes a base, a cooking pot, and a heating device. The cooking pot is located above the base, and the heating device is used to heat the cooking pot and includes a first excitation coil. A lid assembly, located on the cooking body, is used to open and close the opening of the cooking pot; The base has an installation area for the first excitation coil, which is located between the installation area and the bottom wall of the cooking pot. No magnet is placed between the first excitation coil and the installation area. The first excitation coil has a circular structure and is suitable for generating a magnetic field when energized. The magnetic field strength is equal on an imaginary circle of the same diameter. The center of the imaginary circle is located on the central axis of the first excitation coil, and the imaginary circle is on a plane perpendicular to the central axis.

2. The cooking apparatus according to claim 1, characterized in that, The magnetic field has an annular equimagnetic region in a plane perpendicular to the height direction of the cooking pot, and the center of the annular equimagnetic region is located on the central axis of the first excitation coil.

3. The cooking apparatus according to claim 2, characterized in that, The vertical magnetic induction intensity deviation of the annular isomagnetic region is a, -0.1≤a≤0.

1.

4. The cooking apparatus according to claim 2, characterized in that, The effective diameter of the first excitation coil is D, and the radial dimension of the annular equimagnetic region is W, with the ratio of W to D being greater than or equal to 0.

05.

5. The cooking apparatus according to claim 1, characterized in that, The first excitation coil is wound from the inside to the outside in the radial direction of the imaginary circle and includes a plurality of first coil segments; The cooking body further includes a support member, which is located above the base and defines a receiving cavity. The cooking pot is located in the receiving cavity. The support member has multiple mounting slots on the side facing the base, and multiple first coil segments are embedded in the multiple mounting slots.

6. The cooking apparatus according to claim 5, characterized in that, The mounting groove has a hot-pressed deformation section on its wall, which presses against the first coil segment to confine the first coil segment within the mounting groove.

7. The cooking apparatus according to claim 1, characterized in that, The cooking device also includes a magnetic shielding component, which is disposed between the first excitation coil and the mounting area. The magnetic shielding component is disc-shaped, and the center of the magnetic shielding component is located on the central axis of the first excitation coil. Alternatively, no magnetic shielding element may be provided between the first excitation coil and the mounting area.

8. The cooking apparatus according to claim 1, characterized in that, The heating device also includes a second excitation coil, which is positioned corresponding to the peripheral wall of the cooking pot and is coiled from bottom to top along the height direction of the cooking pot.

9. The cooking apparatus according to claim 8, characterized in that, The cooking body includes: A support member is provided above the base and defines a receiving cavity, in which the cooking pot is located; The outer shell is fitted onto the outside of the support member, and its lower end is connected to the base; The first excitation coil is located on the side of the support member facing the base, and the second excitation coil is located on the side of the support member facing the outer shell.

10. The cooking apparatus according to claim 9, characterized in that, The support member includes: Heating plate support; The mounting cylinder has openings at both its upper and lower ends. The lower end of the mounting cylinder is connected to the heating plate bracket and the upper end is connected to the outer shell. The mounting cylinder and the heating plate bracket together define the receiving cavity. The heating plate bracket includes a horizontal extension and an arc-shaped extension. The horizontal extension is disposed opposite to the mounting area, and the arc-shaped extension is connected between the lower end of the horizontal extension and the mounting cylinder. The first excitation coil is disposed on the side of the horizontal extension away from the receiving cavity, and the second excitation coil is disposed on the side of the arc-shaped extension away from the receiving cavity.

11. The cooking apparatus according to claim 10, characterized in that, The portion of the outer casing opposite to the second excitation coil has no magnet between it and the second excitation coil.

12. The cooking apparatus according to claim 9, characterized in that, The cooking body also includes a circuit board assembly, which is placed upright on the periphery of the cooking pot and located between the support and the outer shell.

13. The cooking apparatus according to any one of claims 1-12, characterized in that, The cooking device is a rice cooker or a pressure cooker; and / or, the heating power of the cooking device is less than 1500W.

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