Heating assembly, cooking appliance and cooking apparatus

Abstract

The application discloses a heating assembly, a cooking utensil and a cooking device. The heating assembly comprises a first inorganic layer, a heating layer and a second inorganic layer which are arranged in a stack. The heating layer comprises a first side, a second side and two opposite ends. The first side is connected with the surface of the first inorganic layer, the second side is connected with the surface of the second inorganic layer, and the ends connect the first inorganic layer and the second inorganic layer. The ends have recesses which extend to the inside of the heating layer. Thus, the ends of the heating layer have gaps with the edges of the first inorganic layer and the second inorganic layer. When the heating assembly is connected with a container body, the gaps have air inside. The recesses of the ends of the heating layer can effectively increase the force receiving area, so that the force acting on the interface between the first inorganic layer, the second inorganic layer, the heating assembly and the container body is relatively small, and the service life of the heating assembly is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of household appliances, and particularly relates to a heating assembly, a cooking utensil and a cooking device. BACKGROUND

[0002] When the cooking device is heated, the temperature near the bottom of the container is relatively high, and the material quality of the cooking device needs to be relatively high, especially for the cooking device that needs to be heated at a high temperature for a long time. The existing glass has a relatively low tensile stress resistance. When the tensile stress resistance of the glass exceeds a critical value, the glass will be broken, thereby causing the cooking device to fail.

[0003] Therefore, it is necessary to improve the existing cooking device. SUMMARY

[0004] The present application aims to at least partly improve at least one of the above technical problems.

[0005] To improve the above technical problems, the present application provides a heating assembly, which comprises a first inorganic layer, a heating layer and a second inorganic layer arranged in layers; the heating layer comprises a first side, a second side and two oppositely arranged end portions, the first side is connected with the surface of the first inorganic layer, the second side is connected with the surface of the second inorganic layer, and the end portions connect the first inorganic layer and the second inorganic layer; the end portions have recesses extending to the inside of the heating layer. In this way, the end portions of the heating layer have gaps with the edges of the first inorganic layer and the second inorganic layer. When the heating assembly is connected with the container body, the gaps have air inside. The end portions with recesses can effectively increase the stress area. A large amount of air pressure is in the gaps, so that the force acting on the interface between the first inorganic layer, the second inorganic layer, the heating assembly and the container body is relatively small, thereby effectively improving the service life of the heating assembly. Moreover, the magnetic field generated by the coil disc during electromagnetic heating is weak at the edge portion of the heating layer, and the heat generated at the edge portion of the heating layer is very small. The end portions of the heating layer have recesses, which can make the edge portion of the heating layer use less heating material, thereby saving materials.

[0006] According to an embodiment of the present application, the recesses extend in the extension direction of the first inorganic layer and / or the second inorganic layer.

[0007] According to an embodiment of the present application, the width of the recesses close to the inside of the heating layer is smaller than the width of the recesses away from the inside of the heating layer; the width of the recesses is the distance of the recesses in the thickness direction of the heating layer.

[0008] According to an embodiment of the present application, the width of the recesses in at least part of the area is the same; the width of the recesses is the distance of the recesses in the thickness direction of the heating layer.

[0009] According to an embodiment of the present application, the end portion comprises a wall portion.

[0010] According to an embodiment of the present application, the wall portion comprises a first sub-wall portion and a second sub-wall portion connected to the first sub-wall portion, the first sub-wall portion is connected to the first inorganic layer, and the second sub-wall portion is connected to the second inorganic layer; the first sub-wall portion and the second sub-wall portion form the recess.

[0011] According to an embodiment of the present application, the heat generating component satisfies at least one of the following conditions: an included angle between the first sub-wall portion and the second sub-wall portion is 10-80 degrees; a depth of the recess is greater than 50 microns, the depth of the recess is a distance of the recess in an extension direction of the first inorganic layer; a thickness of the heat generating layer is 10-30 microns; a maximum value of a width of the recess is 10-30 microns.

[0012] According to an embodiment of the present application, the wall portion comprises a first sub-wall portion, a third sub-wall portion and a second sub-wall portion, the third sub-wall portion is connected to the first sub-wall portion and the second sub-wall portion respectively, the first sub-wall portion is connected to the first inorganic layer, and the second sub-wall portion is connected to the second inorganic layer; the first sub-wall portion, the third sub-wall portion and the second sub-wall portion form the recess.

[0013] According to an embodiment of the present application, a surface of the wall portion is arranged opposite to a first surface of the first inorganic layer, wherein an included angle between the surface of the wall portion and the first surface is not equal to 90 degrees; preferably, the included angle between the surface of the wall portion and the first surface is 10-80 degrees or 110-170 degrees; any one of the first inorganic layer and the second inorganic layer forms the recess with the wall portion.

[0014] According to an embodiment of the present application, the heat generating layer is embedded into the first inorganic layer and the second inorganic layer, and a contact interface between the heat generating layer and the first inorganic layer and a contact interface between the heat generating layer and the second inorganic layer both have a concave-convex structure.

[0015] According to an embodiment of the present application, a material forming the heat generating layer comprises metal particles and an inorganic oxide matrix.

[0016] According to an embodiment of the present application, the metal particles satisfy at least one of the following conditions: the metal particles are arranged close to the recess; the metal particles are arranged away from the first inorganic layer and the second inorganic layer.

[0017] According to an embodiment of the present application, the metal particles are distributed in the wall portion. According to an embodiment of the present application, a plurality of the metal particles are aggregated to form a particle aggregate; the particle aggregate is distributed along an extension direction of the recess.

[0018] According to an embodiment of the present application, the particle aggregates are irregularly shaped, and a long axis direction of at least part of the particle aggregates extends along an extension direction of the first inorganic layer, and a short axis direction of at least part of the particle aggregates extends along a thickness direction of the heat generating layer.

[0019] According to an embodiment of the present application, the particle aggregates are arranged away from the first inorganic layer and the second inorganic layer, and a spacing is provided between the first inorganic layer, the second inorganic layer and the particle aggregates, and the inorganic oxide matrix is distributed in the spacing.

[0020] According to an embodiment of the present application, along the thickness direction of the heat generating layer, a plurality of the particle aggregates are arranged at intervals, and a spacing is provided between adjacent particle aggregates, and the inorganic oxide matrix is distributed in the spacing.

[0021] According to an embodiment of the present application, the bottom of the recess is arranged close to the inorganic oxide matrix; and the bottom of the recess is a position on the end portion which is closest to the inside of the heat generating layer.

[0022] According to an embodiment of the present application, the area of the first inorganic layer is equal to the area of the second inorganic layer, the heat generating layer has a smaller area in orthographic projection on the first inorganic layer than the area of the first inorganic layer, and the minimum distance between the end portion of the heat generating layer and the side surface of the first inorganic layer is 5-20 microns, wherein the surface of the first inorganic layer which is in contact with the heat generating layer is perpendicular to the side surface of the first inorganic layer.

[0023] The present application also provides a cooking appliance comprising a container body and a container bottom which is connected to the container body and forms a containing space, and the container bottom comprises the heat generating assembly described above. Thus, the cooking appliance has all the features and advantages of the heat generating assembly described above, which will not be repeated here.

[0024] According to an embodiment of the present application, the cooking appliance is a kettle, a microcrystalline pot for induction cooker, an electric rice cooker or a stew pot.

[0025] The present application also provides a cooking device comprising the heat generating assembly described above or the cooking appliance described above. Thus, the cooking device has all the features and advantages of the heat generating assembly described above or the cooking appliance described above, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic view of an existing cooking appliance;

[0027] Figure 2 is a schematic view of the force of air expansion on each part of the heat generating assembly when the existing heat generating assembly is working.

[0028] Figure 3 is a structural schematic diagram of a heating assembly in one embodiment of the present application;

[0029] Figure 4 is a schematic diagram of the force of air expansion on each part of the heating assembly when the heating assembly is in operation in one embodiment of the present application;

[0030] Figure 5 is a structural schematic diagram of a heating assembly in another embodiment of the present application;

[0031] Figure 6 is a scanning electron microscope image of the end of a heating layer in one embodiment of the present application;

[0032] Figure 7 is a scanning electron microscope image of the end of a heating layer in another embodiment of the present application;

[0033] Figure 8 is a structural schematic diagram of a heating assembly in another embodiment of the present application;

[0034] Figure 9 is a structural schematic diagram of a heating assembly in another embodiment of the present application;

[0035] Figure 10 is a structural schematic diagram of a heating assembly in another embodiment of the present application;

[0036] Figure 11 is a structural schematic diagram of a heating layer in one embodiment of the present application;

[0037] Figure 12 is a structural schematic diagram of a heating layer in another embodiment of the present application.

[0038] BRIEF DESCRIPTION OF DRAWINGS

[0039] 100 - first inorganic layer, 200 - heating layer, A - first side portion, B - second side portion, C - end portion, D - wall portion, D1 - first sub-wall portion, D2 - second sub-wall portion, D3 - third sub-wall portion, E - recess, E1 - bottom of recess, 210 - particle aggregate, 220 - inorganic oxide matrix, 300 - second inorganic layer. DETAILED DESCRIPTION

[0040] The present application will be explained in detail below with reference to the embodiments. Those skilled in the art will understand that the embodiments below are merely for the purpose of illustrating the present application and should not be considered as limiting the scope of the present application. In the embodiments, the specific techniques or conditions not mentioned are performed according to the techniques or conditions described in the literature in the art or according to the product manual. The reagents or instruments not mentioned are all conventional products that can be obtained commercially.

[0041] The inventor finds that when the cooking utensil IH is heated, the bottom of the cooking utensil is provided with a coil disc, referring to Figure 1 The heating component at the bottom of the container generates heat through electromagnetic heating. The heating component includes two opposite glasses and a heating layer sandwiched between the two glasses. Referring to Figure 2 The edge of the existing heating layer is perpendicular to the extension direction of the heating layer, and the edge of the heating layer has a gap with the edge of the glass. After the glass edge of the heating component is connected with the container body, the gap pressure is negative pressure or 1 atmosphere, and there is air inside. During the heating process of the heating component, the air inside the gap will expand to a certain extent, which will generate a certain pressure on the upper, lower and left and right parts of the gap. The existing glass has low tensile stress, and when the tensile stress of the glass exceeds the critical value, the glass will be broken, thereby causing the cooking utensil to fail.

[0042] To improve the above technical problems, the present application provides a heating component, referring to Figure 3 The heating component includes a first inorganic layer 100, a heating layer 200 and a second inorganic layer 300 which are stacked in sequence; the heating layer 200 includes a first side A and a second side B opposite to the first side A, and the heating layer 200 further includes two end portions C which are arranged on opposite sides of the heating layer 200; the surface of the first inorganic layer 100 is connected with the first side A, the surface of the second inorganic layer 300 is connected with the second side B, and the end portion C connects the second inorganic layer 300 and the first inorganic layer 100; the end portion C has a recess E which extends to the inside of the heating layer 200. Referring to Figure 4 The end portion C of the heating layer 200 has a gap with the edges of the first inorganic layer 100 and the second inorganic layer 300, and when the heating component is connected with the container body, the gap has air inside. The structure of the present application can effectively increase the stress area, a large amount of air pressure is inside the gap, so that the force acting on the interface between the second inorganic layer, the first inorganic layer, the heating component and the container body is relatively small, effectively improving the safety and service life of the heating component. Moreover, the magnetic field generated by the coil disc during electromagnetic heating is weak at the edge portion of the heating layer 200, and the heat generated at the edge portion of the heating layer 200 is very small. The end portion C of the heating layer 200 has a recess E, which can reduce the amount of heating material used at the edge portion when forming the heating layer 200, thereby saving materials.

[0043] It should be noted that, since the bonding strength inside the heating layer 200 is very high, the influence of the stress inside the heating layer 200 during the heating process can be ignored, the end C of the heating layer 200 has a recess E, which effectively increases the stress area, so that the force acting on the interface between the second inorganic layer 300, the first inorganic layer 100, the heating assembly and the container body is relatively small, thereby reducing the risk of rupture of the heating assembly and improving the safety and service life of the heating assembly.

[0044] According to some embodiments of the present application, the second inorganic layer 300 can be close to the coil disc at the bottom of the cooking utensil, and the first inorganic layer 100 can be close to the object to be heated. The thickness of the first inorganic layer 100 is smaller than the thickness of the second inorganic layer 300. The first inorganic layer 100 has a smaller thickness, which can shorten the distance of heat transfer to the first inorganic layer 100, so that the heat can be transferred to the object to be heated faster, and the heat transfer rate and heat utilization rate can be improved. The second inorganic layer 300 has a larger thickness, and the mechanical strength of the second inorganic layer 300 is larger, which can avoid the rupture of the second inorganic layer 300 and other adverse problems during use. However, the thickness of the first inorganic layer 100 and the thickness of the second inorganic layer 300 are not limited to the above-mentioned case, and a person skilled in the art can adjust them according to the use requirements. Specifically, the thickness of the first inorganic layer 100 can be equal to the thickness of the second inorganic layer 300, or the thickness of the first inorganic layer 100 can be greater than the thickness of the second inorganic layer 300.

[0045] According to some embodiments of the present application, the material forming the first inorganic layer 100 and the material forming the second inorganic layer 300 can both be glass. Specifically, the material forming the first inorganic layer 100 and the material forming the second inorganic layer 300 can be the same or different, and each is independently selected from high borosilicate glass, microcrystalline glass, and alkali-free glass. It should be noted that microcrystalline glass, high borosilicate glass, and alkali-free glass have good high-temperature resistance. Using these materials as the materials forming the second inorganic layer 300 and / or the first inorganic layer 100 can effectively improve the stability of the heating assembly, and can effectively improve the safety of the heating assembly during use.

[0046] According to some embodiments of the present application, the second inorganic layer 300 has an area equal to that of the first inorganic layer 100, and the area of the orthographic projection of the heat generating layer 200 on the first inorganic layer 100 can be smaller than the area of the first inorganic layer 100. In this case, the minimum distance between the end portion C of the heat generating layer 200 and the side surface of the first inorganic layer 100 can be 5-20 microns, wherein the surface of the first inorganic layer 100 in contact with the heat generating layer 200 is perpendicular to the side surface of the first inorganic layer 100. For example, the minimum distance between the end portion C of the heat generating layer 200 and the side surface of the first inorganic layer 100 can be 5 microns, 6 microns, 7 microns, 8 microns, 9 microns, 10 microns, 11 microns, 12 microns, 13 microns, 14 microns, 15 microns, 16 microns, 17 microns, 18 microns, 19 microns, or 20 microns. The side surface of the first inorganic layer 100 is the surface perpendicular to the extension direction of the first inorganic layer 100. When the minimum distance between the end portion C of the heat generating layer 200 and the side surface of the first inorganic layer 100 is 5-20 microns, the melting of the heat generating layer caused by high temperature during the welding of the container bottom containing the heat generating assembly and the container body can be effectively avoided, and the safety and service life of the heat generating assembly are further improved. If the above distance is too large or too small, the electromagnetic heating effect will be poor. Specifically, during the welding of the container bottom containing the heat generating assembly and the container body, the edge portion of the heat generating assembly connected to the container body has a high temperature, and the temperature of the edge portion during welding is greater than 900°C. If the above distance is too small, the distance between the heat generating layer 200 and the edge portion is too small, which can cause the temperature of the heat generating layer 200 to be too high, and thus the heat generating layer 200 melts, which can affect the appearance and electromagnetic heating effect. If the above distance is too large, the area of the heat generating layer 200 in the heat generating assembly is relatively small, which can result in poor overall electromagnetic heating effect.

[0047] According to the embodiments of the present application, the recess E extends toward the extension direction of the second inorganic layer 300 and / or the first inorganic layer 100. That is, the recess E extends along the direction from the outside of the heat generating layer 200 toward the inside of the heat generating layer 200.

[0048] According to an embodiment of the present application, the width of the recess E close to the inside of the heat generating layer 200 is smaller than the width of the recess E away from the inside of the heat generating layer 200, that is, the gap formed by the recess E gradually increases in the direction from the inside of the heat generating layer 200 to the outside of the heat generating layer 200; it should be noted that the width of the recess E refers to the distance of the recess E in the thickness direction of the heat generating layer 200. In this case, the gap formed by the recess E gradually increases in the direction from the inside of the heat generating layer 200 to the outside of the heat generating layer 200, and finally forms a gap with the thickness of the heat generating layer 200; when the heat generating assembly is working, the force bearing area of the air in the gap can be further increased, and a large amount of air pressure is inside the recess E, which further reduces the impact force of the air pressure on the interface position of the second inorganic layer 300, the first inorganic layer 100, the heat generating assembly and the container body, and further improves the safety and service life of the heat generating assembly. In addition, such design can also reduce the heat generation of the end portion C, reduce the accumulation of heat at the connection between the heat generating assembly and the container body, and reduce the risk of cracking at the connection. Moreover, the heat at the connection between the end portion C and the inorganic layer (including the first inorganic layer 100 and the second inorganic layer 300) is higher than that inside the end portion, which can promote the transmission of heat on the inorganic layer and improve the heating efficiency. In addition, the width of the recess E close to the inside is small, which promotes the heat outside the end portion C to be lower than that inside, reduces the accumulation of heat at the connection between the heat generating assembly and the container body, reduces the risk of cracking at the connection, and ensures the heating efficiency inside.

[0049] According to an embodiment of the present application, referring to Figure 5 , Figure 6 and Figure 7 , the width of the recess E in at least part of the area is the same; the width of the recess E refers to the distance of the recess E in the thickness direction of the heat generating layer 200 (refer to W in Figure 5 ). Such design can promote the uniformity of heat at the recess E, specifically, on the one hand, it promotes the uniformity of the impact force, and on the other hand, it promotes the uniformity of the overall heating of the heat generating layer 200.

[0050] The present application does not limit the specific shape of the end portion C and the specific shape of the recess E, as long as the recess can increase the force bearing area. Those skilled in the art can adjust the specific shape of the end portion C and the specific shape of the recess E according to actual needs.

[0051] In addition, it should be noted that the same width means the same within the error range, not absolute equality. In addition, the present application does not limit the specific area of the recess with the same width in the end portion, and the skilled person can flexibly adjust according to the use requirements.

[0052] According to an embodiment of the present application, the end portion C comprises a wall portion D.

[0053] According to an embodiment of the present application, referring toFigure 8 The wall portion D comprises a second sub-wall portion D2 and a first sub-wall portion D1, the first sub-wall portion D1 is used to connect the second sub-wall portion D2, the first inorganic layer 100, the second sub-wall portion D2 is used to connect the first sub-wall portion D1, the second inorganic layer 300, the second sub-wall portion D2 is connected with the first sub-wall portion D1; the second sub-wall portion D2 and the first sub-wall portion D1 constitute a recess E. In this case, the end portion C has a topography spaced from each other, the second sub-wall portion D2 and the first sub-wall portion D1 form the recess E, and the recess E extends to the inside of the heating assembly, which effectively increases the stress area, further reduces the force acting on the interface position of the second inorganic layer 300, the first inorganic layer 100, the heating assembly and the container body, reduces the risk of cracking of the heating assembly, effectively improves the safety and service life of the heating assembly. Moreover, such design can also promote the heating layer 200 to be subjected to force in multiple directions, reduce the concentration of the force, and reduce the risk of cracking; the force can be transmitted to the inorganic layer (including the first inorganic layer 100 and the second inorganic layer 300) through the heating layer 200, weaken the stress of the inorganic layer, and reduce the risk of separation of the inorganic layer and the heating layer 200.

[0054] The present application does not limit the position of the connection point of the second sub-wall portion D2 and the first sub-wall portion D1, for example, the connection point of the second sub-wall portion D2 and the first sub-wall portion D1 can be located in the middle of the heating layer 200, that is, along the thickness direction of the heating layer 200, the distance between the connection point of the second sub-wall portion D2 and the first sub-wall portion D1 and the second inorganic layer 300 and the distance between the connection point of the second sub-wall portion D2 and the first sub-wall portion D1 and the first inorganic layer 100 can be equal, for example, the second sub-wall portion D2 and the first sub-wall portion D1 can be symmetrically designed relative to the center of the heating layer 200. Such design can promote the uniformity of the stress of the heating layer 200, the inorganic layer (including the first inorganic layer 100 and the second inorganic layer 300) and the container body, further reducing the risk of cracking; in addition, it can also promote the uniformity of the heating of the end portion of the heating layer 200, further reducing the risk of cracking.

[0055] Alternatively, the connection between the second sub-wall portion D2 and the first sub-wall portion D1 can be close to the second inorganic layer 300, wherein the thickness of the second inorganic layer 300 is greater than the thickness of the first inorganic layer 100. Such design can promote the heat transfer to the first inorganic layer 100, and the first inorganic layer 100 is close to the inside of the cooking device, so that the heat can be transferred to the inside of the cooking device faster, and the food can be cooked faster.

[0056] However, the connecting point of the second sub-wall portion D2 and the first sub-wall portion D1 can be located at other positions, as long as the second sub-wall portion D2 and the first sub-wall portion D1 can form a recess towards the inside of the heat generating layer 200 after being connected, so as to increase the force receiving area, and further reduce the force acting on the interface position between the second inorganic layer 300, the first inorganic layer 100, the heat generating assembly and the container body, and reduce the risk of cracking of the heat generating assembly.

[0057] According to the embodiments of the present application, the included angle formed by the second sub-wall portion D2 and the first sub-wall portion D1 can be 10-80 degrees, and the included angle can be 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees, 45 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees or 80 degrees. If the included angle formed by the second sub-wall portion D2 and the first sub-wall portion D1 is too small, the distance of the corresponding recess E into the inside of the heat generating assembly is too large, and the amount of heat generating layer 200 material in the orthographic projection part of the first inorganic layer 100 is relatively small, i.e. the amount of heat generating layer 200 material at the recess position is less than that at other positions, which can cause uneven heat of the heat generating assembly, and specifically, can easily cause the risk of interlayer cracking of the heat generating layer 200, and the heat emitted by the heat generating layer 200 in contact with the inorganic layer (including the first inorganic layer 100 and the second inorganic layer 300) is relatively concentrated, which can easily cause cracking of the inorganic layer. If the included angle formed by the second sub-wall portion D2 and the first sub-wall portion D1 is too large, the distance of the corresponding recess E into the inside of the heat generating assembly is too small, and the force receiving area cannot be effectively increased, which has a small degree of reduction of the force acting on the interface position between the second inorganic layer 300, the first inorganic layer 100, the heat generating assembly and the container body, and the risk of cracking of the heat generating assembly is still high.

[0058] According to some specific embodiments of the present application, the depth of the recess E is greater than 50 microns, and the depth of the recess E (referring to Figure 8The distance of the recess E in the first inorganic layer 100 in the extending direction of the recess E is the depth of the recess E (indicated by S in the figure). Exemplarily, the depth of the recess E can be 50 microns, 55 microns, 60 microns, 65 microns, 70 microns, 75 microns, 80 microns, 85 microns, 90 microns, 95 microns, 100 microns, 105 microns, 110 microns, 115 microns, 120 microns, 125 microns, 130 microns, 135 microns, 140 microns, 144 microns, 145 microns, 150 microns, 155 microns, 160 microns, and the like. If the depth of the recess E is too small, that is, the distance of the recess E into the interior of the heat-generating component is too small, the force-receiving area cannot be effectively increased, and the degree of reduction of the force acting on the interface position of the second inorganic layer 300, the first inorganic layer 100, the heat-generating component, and the container body is small, and the risk of rupture of the heat-generating component is still high. In addition, if the depth of the recess E is too small, it is not conducive to reducing the heat dissipation of the end portion C, and heat is easily accumulated at the connection between the heat-generating component and the container body, thereby increasing the risk of cracking at the connection.

[0059] According to some embodiments of the present application, the thickness of the heat-generating layer 200 can be 10-30 microns, and exemplarily, can be 10 microns, 11 microns, 12 microns, 13 microns, 14 microns, 15 microns, 16 microns, 17 microns, 18 microns, 19 microns, 20 microns, 21 microns, 22 microns, 23 microns, 24 microns, 25 microns, 26 microns, 27 microns, 28 microns, 29 microns, 30 microns. The heat generated by the heat-generating layer 200 with the above thickness range is appropriate, and the thickness of the heat-generating layer 200 is small, which does not significantly increase the thickness of the container bottom of the cooking appliance, and in turn, the thickness of the container bottom of the cooking appliance is small, which can effectively improve the market competitiveness of the product.

[0060] According to some embodiments of the present application, the maximum value of the width of the recess E is 10-30 microns. Specifically, when the area of the first inorganic layer 100 is equal to the area of the second inorganic layer 300, and the orthographic projection area of the heat-generating layer 200 on the first inorganic layer 100 is smaller than the area of the first inorganic layer 100, in the region opposite to the second inorganic layer 300 of the first inorganic layer 100, a part is not provided with the heat-generating layer 200, that is, the maximum value of the width of the recess E can be the thickness of the heat-generating layer 200. According to the embodiments of the present application, referring to Figure 9The wall portion D includes a third sub-wall portion D3, a second sub-wall portion D2 and a first sub-wall portion D1, the first sub-wall portion D1 connects the first inorganic layer 100 and the third sub-wall portion D3, the third sub-wall portion D3 connects the second sub-wall portion D2 and the first sub-wall portion D1, the second sub-wall portion D2 connects the third sub-wall portion D3 and the second inorganic layer 300, and the third sub-wall portion D3, the second sub-wall portion D2 and the first sub-wall portion D1 are connected in the above manner to form the recess E. Such a design can disperse the stress, improve the uniformity of the stress, and reduce the phenomenon of stress concentration. In addition, it can also reduce the accumulation of heat at the bottom of the recess, and reduce the risk of interlayer cracking.

[0061] That is, the present application does not limit the specific formation of the recess E, and the wall portion can be formed by two sub-wall portions or three sub-wall portions. Those skilled in the art can understand that the wall portion can also be formed by more than four sub-wall portions.

[0062] According to an embodiment of the present application, with reference to Figure 10 The surface of the wall portion D is arranged opposite to the first surface of the first inorganic layer 100, and the included angle between the surface of the wall portion D and the first surface is not equal to 90 degrees. The first surface of the first inorganic layer 100 refers to the surface of the first inorganic layer 100 in contact with the heat generating layer 200. Such a design can improve the heat dissipation of the heat generating layer 200 on one side inorganic layer (the first inorganic layer 100 or the second inorganic layer 300), promote the heat transfer to one side inorganic layer, and promote the uniformity of heat transfer in the heat generating layer 200, thereby reducing the risk of interlayer cracking.

[0063] For example, the wall portion D can be an inclined plane, as long as the included angle between the first inorganic layer 100 and the plane where the wall portion D is located is not 90 degrees. For example, the included angle between the surface of the wall portion D opposite to the first inorganic layer 100 and the surface of the first inorganic layer 100 is 10-80 degrees or 110-170 degrees.

[0064] Either the second inorganic layer 300 or the first inorganic layer 100 can form a recess E with the wall portion D. In this case, the end portion C can also form a recess towards the inside of the heat generating layer 200, effectively increasing the stress area, thereby reducing the force acting on the interface position between the second inorganic layer 300, the first inorganic layer 100, the heat generating assembly and the container body, reducing the risk of cracking of the heat generating assembly, and improving the safety and service life of the heat generating assembly.

[0065] According to an embodiment of the present application, the heat generating layer 200 is embedded in the first inorganic layer 100, and the contact interface between the first inorganic layer 100 and the heat generating layer 200 has a concave-convex structure, while the heat generating layer 200 is embedded in the second inorganic layer 300, and the contact interface between the second inorganic layer 300 and the heat generating layer 200 also has a concave-convex structure. That is, the position where the heat generating layer 200 contacts the second inorganic layer 300 and the first inorganic layer 100 is not a flat interface, which can make the adhesion of the heat generating layer 200 to the second inorganic layer 300 and the first inorganic layer 100 better. At the same time, it can further improve the uniformity of heat transfer to the second inorganic layer 300 and the first inorganic layer 100.

[0066] According to an embodiment of the present application, referring to Figure 11 and Figure 12 , the material forming the heat generating layer 200 includes an inorganic oxide matrix 220 and metal particles (not shown in the figure). The heat in the heat generating layer 200 can be quickly transferred through the metal particles, improving the heating efficiency and heating uniformity of the heat generating layer 200, reducing the accumulation of heat on one side of the heat generating layer 200, and improving the stability of the heat generating assembly. The inorganic oxide matrix 220 can disperse the thermal stress generated by the metal particles during heating, thereby reducing the risk of cracking and interlayer peeling of the heat generating layer 200, and further improving the safety and service life of the heat generating assembly.

[0067] According to some specific embodiments of the present application, the inorganic oxide matrix 220 includes at least one of silicon oxide, bismuth oxide, magnesium oxide, and potassium oxide, which have good thermal stress dispersion characteristics and are low in price, which can further reduce the production cost of the heat generating assembly.

[0068] The material of the metal particles includes at least one of silver, aluminum, and copper, which have good electrical conductivity, and these materials are weakly magnetic metal materials with a relative magnetic permeability less than 1, which can generate current eddy current heating in response to a magnetic field, which is conducive to improving the heating efficiency of the heat generating layer.

[0069] According to an embodiment of the present application, the metal particles are arranged close to the recess E, in which case the thermal stress generated by the end portion C of the heat generating assembly during operation can be further reduced, thereby reducing the risk of cracking of the end portion C, and further improving the safety and service life of the heat generating assembly. This design can further improve the efficiency of heat transfer from the recess E to the gap in the recess E, promoting the pressure of the gas in the "recess".

[0070] According to some embodiments of the present application, the metal particles are arranged away from the second inorganic layer 300 and the first inorganic layer 100. That is, the metal particles are arranged at a distance from the second inorganic layer 300 and the first inorganic layer 100, avoiding direct contact between the metal particles and the second inorganic layer 300 and the first inorganic layer 100, thereby reducing the risk of cracking of the second inorganic layer 300 and the first inorganic layer 100 during heating, and thereby improving the safety and service life of the heating assembly.

[0071] According to some embodiments of the present application, the metal particles are distributed in the wall portion D. In this way, the efficiency of heat transfer from the interior of the heating layer 200 to the gap of the recess E can be further improved, and the pressure of the gas can be applied inside the recess.

[0072] According to some embodiments of the present application, the metal particles are distributed in the wall portion D. In this way, the efficiency of heat transfer from the interior of the heating layer 200 to the gap of the recess E can be further improved, and the pressure of the gas can be applied inside the recess.

[0073] According to some embodiments of the present application, the metal particles are distributed in the wall portion D. In this way, the efficiency of heat transfer from the interior of the heating layer 200 to the gap of the recess E can be further improved, and the pressure of the gas can be applied inside the recess.

[0074] According to some embodiments of the present application, the metal particles are distributed in the wall portion D. In this way, the efficiency of heat transfer from the interior of the heating layer 200 to the gap of the recess E can be further improved, and the pressure of the gas can be applied inside the recess.

[0075] It should be particularly noted that the long axis refers to the longest line segment connecting two points on the particle aggregate 210, and the long axis direction refers to the extension direction along the line segment; the short axis refers to the shortest line segment connecting two points on the particle aggregate 210, and the short axis direction refers to the extension direction along the line segment.

[0076] In some embodiments of the present application, the particle aggregate 210 can be ellipsoidal, but is not limited thereto, and the particle aggregate 210 can also be of other shapes.

[0077] According to some embodiments of the present application, at the starting position of the recess E, the long axis direction of the particle aggregate 210 is along the extension direction of the first inorganic layer 100, and the short axis direction of the particle aggregate 210 is along the thickness direction of the heat generating layer 200. In this case, the long axis of the particle aggregate 210 is close to the first inorganic layer 100, which can increase the heat transfer area between the particle aggregate 210 and the first inorganic layer 100, thereby improving the utilization rate of heat and the uniformity of heat transfer of the heat generating layer 200. Similarly, the long axis of the particle aggregate 210 is close to the second inorganic layer 300, which can increase the heat transfer area between the particle aggregate 210 and the second inorganic layer 300, thereby improving the utilization rate of heat and the uniformity of heat transfer of the heat generating layer 200, reducing the accumulation of heat in the heat generating layer 200, reducing the thermal stress generated at the end during heating, further reducing the risk of cracking at the end, and further improving the safety and service life of the heat generating assembly.

[0078] According to an embodiment of the present application, referring to Figure 11 , the particle aggregate 210 is arranged away from the second inorganic layer 300 and the first inorganic layer 100, and there is a gap between the second inorganic layer 300, the first inorganic layer 100 and the particle aggregate 210, and the inorganic oxide matrix 220 is distributed in the gap. In this case, the particle aggregate 210 and the second inorganic layer 300, the first inorganic layer 100 are separated by the inorganic oxide matrix 220, which improves the uniformity of heat transfer to the second inorganic layer 300, the first inorganic layer 100, reduces the risk of excessive heating power causing excessive noise, and reduces the risk of cracking at the interface between the second inorganic layer 300, the first inorganic layer 100, the heat generating assembly and the container body. At the same time, it can also avoid the heat concentration in the middle of the heat generating layer 200 causing the heat generating layer 200 to fall off, improve the uniformity of heat transfer, and further improve the safety and service life of the heat generating assembly.

[0079] According to an embodiment of the present application, referring to Figure 12 , along the thickness direction of the heat generating layer 200, the plurality of particle aggregates 210 are arranged at intervals, and there is a gap between adjacent particle aggregates 210, and the inorganic oxide matrix 220 is distributed in the gap. In this case, the heat concentration can be avoided to cause the heat generating layer 200 to fall off between layers, the uniformity of heat transfer is improved, and the safety and service life of the heat generating assembly are improved.

[0080] According to an embodiment of the present application, referring to Figure 11 and Figure 12The bottom E1 of the recess is close to the inorganic oxide base 220. The bottom E1 of the recess is the position closest to the inside of the heating layer 200 on the end C. In this case, the thermal stress of the bottom E1 of the recess during heating can be reduced, the risk of cracking and interlayer peeling of the end C can be reduced, and the safety and service life of the heating assembly can be improved.

[0081] Those skilled in the art can select a corresponding preparation method according to the structure of the heating assembly. For example, when the end C of the heating layer 200 has the second sub-wall portion D2 and the first sub-wall portion D1, and the two form an included angle, i.e., the heating assembly shown in Figure 8 is prepared, it can be made in the following manner.

[0082] The first inorganic layer 100 is provided, a heating layer material is coated on the surface of the first inorganic layer 100 to form a first layered structure; the second inorganic layer 300 is provided, a heating layer material is coated on the surface of the second inorganic layer 300 to form a second layered structure, and then the edges of the first layered structure are processed to form a first side wall, and the edges of the second layered structure are processed to form a second side wall. Then, the first inorganic layer 100 formed with the first layered structure and the second inorganic layer 300 formed with the second layered structure are laminated, so that the second layered structure and the first layered structure are located between the second inorganic layer 300 and the first inorganic layer 100, the first side wall and the second side wall are connected, and after drying treatment, the heating layer 200 is formed, the end of the heating layer 200 has the second sub-wall portion and the first sub-wall portion, and the two can form an included angle.

[0083] The application also provides a cooking utensil, which comprises a container bottom and a container body. The container body and the container bottom are connected to form a containing space. The container bottom comprises the heating assembly described above. In this case, the cooking utensil has all the features and advantages of the heating assembly described above, which will not be repeated here. In general, when the heating assembly of the cooking utensil is working, the force acting on the interface between the first inorganic layer, the second inorganic layer, the heating assembly and the container body is relatively small, which effectively improves the safety and service life of the heating assembly and the cooking utensil.

[0084] According to some specific embodiments of the application, the connection between the container body and the container bottom can be achieved by welding. The container body and the container bottom after welding can form a containing space for containing food or water.

[0085] It is understood by those skilled in the art that the cooking utensil can further comprise a heating base, and the heating base comprises a functional module capable of enabling the heating component to generate heat. According to one specific embodiment of the present application, the functional module can be an electromagnetic induction coil, and the electromagnetic induction coil can form a magnetic field to make the heating layer generate eddy current, thereby generating heat and heating water, food, etc. in the accommodation space.

[0086] According to embodiments of the present application, the cooking utensil includes but is not limited to a stew pot, an electric rice cooker, an electromagnetic induction microcrystalline pot, and a kettle.

[0087] The present application also provides a cooking device comprising the heating component described above or the cooking utensil described above. In this case, the cooking device has all the features and advantages of the heating component described above or the cooking utensil described above, which will not be described here. In general, the cooking device has the advantages of high heating efficiency, high safety, long service life, etc.

[0088] The above describes embodiments of the present application, but the present application is not limited to the specific details of the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, and these simple modifications all belong to the protection scope of the present application. In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction.

[0089] It should be noted that in the present specification, the terms "first", "second", etc. are only used for description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. The orientation or position relationship indicated by the terms "upper", "lower", etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and does not require the present application to be constructed and operated in a specific orientation. It cannot be understood as a limitation on the present application.

[0090] In the description of the present specification, the description referring to the terms "one embodiment", "some specific embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0091] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A heat generating component, characterized by The heating component comprises a first inorganic layer, a heating layer and a second inorganic layer arranged in a stack; The heating layer comprises a first side, a second side and two opposite ends, the first side is connected with a surface of the first inorganic layer, the second side is connected with a surface of the second inorganic layer, and the ends connect the first inorganic layer and the second inorganic layer; The end has a recess extending to the inside of the heating layer.

2. The heat generating component of claim 1, wherein, The recess extends in the extending direction of the first inorganic layer and / or the second inorganic layer.

3. The heat generating component of claim 1, wherein, The width of the recess close to the inside of the heating layer is smaller than the width of the recess away from the inside of the heating layer. The width of the recess is the distance of the recess in the thickness direction of the heating layer.

4. The heat generating component of claim 1, wherein, The width of the recess in at least part of the area is the same. The width of the recess is the distance of the recess in the thickness direction of the heating layer.

5. The heat generating component of claim 1, wherein, The end comprises a wall.

6. The heat generating assembly of claim 5, wherein, The wall comprises a first sub-wall connected with the first inorganic layer and a second sub-wall connected with the second inorganic layer. The first sub-wall and the second sub-wall form the recess.

7. The heat generating assembly of claim 6, wherein, The heating component satisfies at least one of the following conditions: The included angle between the first sub-wall and the second sub-wall is 10-80 degrees; The depth of the recess is greater than 50 microns, and the depth of the recess is the distance of the recess in the extending direction of the first inorganic layer; The thickness of the heating layer is 10-30 microns; The maximum value of the width of the recess is 10-30 microns.

8. The heat generating component of claim 5, wherein, The wall comprises a first sub-wall, a third sub-wall and a second sub-wall, the third sub-wall is connected with the first sub-wall and the second sub-wall respectively, the first sub-wall is connected with the first inorganic layer, and the second sub-wall is connected with the second inorganic layer; The first sub-wall, the third sub-wall and the second sub-wall form the recess.

9. The heat generating component of claim 5, wherein, The surface of the wall is arranged opposite to the first surface of the first inorganic layer, wherein the included angle between the surface of the wall and the first surface is not equal to 90 degrees, and the first surface of the first inorganic layer refers to the surface of the first inorganic layer in contact with the heating layer; The included angle between the surface of the wall and the first surface is 10-80 degrees or 110-170 degrees; Any one of the first inorganic layer and the second inorganic layer forms the recess with the wall.

10. The heat generating component of claim 2, wherein, The heating layer is embedded in the first inorganic layer and the second inorganic layer, and the contact interface between the heating layer and the first inorganic layer and the contact interface between the heating layer and the second inorganic layer both have a concave-convex structure.

11. The heat generating component of claim 1, wherein, The material forming the heating layer comprises metal particles and an inorganic oxide matrix.

12. The heat generating component of claim 11, wherein, The end comprises a wall, and the wall is distributed with the metal particles, and the metal particles satisfy at least one of the following conditions: The metal particles are arranged close to the recess; The metal particles are arranged away from the first inorganic layer and the second inorganic layer.

13. The heat generating component of claim 11, wherein, A plurality of metal particles are aggregated to form a particle aggregate; The particle aggregates are spaced along the extension direction of the recess.

14. The heat generating component of claim 13, wherein, The particle aggregates are irregularly shaped, and a long axis direction of at least part of the particle aggregates is along the extension direction of the first inorganic layer, and a short axis direction of at least part of the particle aggregates is along the thickness direction of the heat-generating layer.

15. The heat generating component of claim 13, wherein, The particle aggregates are arranged away from the first inorganic layer and the second inorganic layer, and there is a space between the first inorganic layer, the second inorganic layer and the particle aggregates, and the space is distributed with the inorganic oxide matrix.

16. The heat generating component of claim 13, wherein, Along the thickness direction of the heat-generating layer, a plurality of the particle aggregates are arranged at intervals, and there is a space between adjacent particle aggregates, and the space is distributed with the inorganic oxide matrix.

17. A heat generating assembly according to claim 15 or 16, characterised in that, The bottom of the recess is arranged close to the inorganic oxide matrix; The bottom of the recess is the position on the end portion which is closest to the inside of the heat-generating layer.

18. The heat generating component of claim 1, wherein, The area of the first inorganic layer is equal to the area of the second inorganic layer, and the area of the orthographic projection of the heat-generating layer on the first inorganic layer is smaller than the area of the first inorganic layer; The minimum distance between the end portion of the heat-generating layer and the side surface of the first inorganic layer is 5-20 microns, wherein the surface of the first inorganic layer which is in contact with the heat-generating layer is perpendicular to the side surface of the first inorganic layer.

19. A cooking appliance characterized by, The container comprises a container body and a container bottom, the container bottom is connected with the container body and forms a containing space, and the container bottom comprises the heat-generating assembly according to any one of claims 1-18.

20. A cooking apparatus, characterized by, The cooking appliance comprises the heat-generating assembly according to claim 19.

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