Heating assembly, cooking appliance and cooking apparatus

Abstract

The application provides a heating assembly, a cooking utensil and a cooking device. The heating assembly comprises two layers of non-metal plates and a heating layer between the non-metal plates. The heating layer comprises metal powder particles and an inorganic oxide matrix. The metal powder particles are distributed in the inorganic oxide matrix. In at least a part of the heating layer, a plurality of the metal powder particles form particle aggregates. The particle aggregates are arranged along the thickness direction of the heating layer. In this way, the heating efficiency and the uniformity of the heating assembly are improved, and the thermal stress generated during the heating process is reduced, and the risk of cracking and interlayer peeling of the heating layer is reduced.

Description

Technical Field

[0001] This application relates to the field of household appliances, specifically to heating elements, cooking utensils, and cooking equipment. Background Technology

[0002] Many existing cooking appliances utilize inorganic materials such as ceramics and glass. Examples include ceramic inner pots in electric slow cookers, glass inner pots in glass kettles and health-preserving pots, and microcrystalline and ceramic pots used in induction cookers. These inorganic materials possess excellent chemical stability and are healthy and environmentally friendly, but they also have many drawbacks, such as low heat transfer efficiency, poor toughness, and fragility. Current conventional heating methods primarily employ heating elements such as heating tubes and heating plates, with the glass vessel contacting the heating element and plate for heat transfer. This approach is characterized by its simple overall structure, but it suffers from significant problems, such as a small contact area, difficulty in achieving tight contact, and extremely low heat transfer efficiency. For example, heating 1L of water in a kettle can take over 15 minutes. Some manufacturers have attempted to improve the thermal efficiency of this technology, but the benefits have been limited. Furthermore, some manufacturers have adopted thick-film heating and other solutions, which involve printing thick-film circuits on glass plates for heating. This solution has high thermal efficiency and uniform heating, but it has high requirements for the glass, such as using heat-resistant quartz glass. It also has safety issues, as the large current in the event of glass breakage poses a great safety hazard to consumers. Similar solutions include printed tin oxide and thermally sprayed heating wires.

[0003] Therefore, the current heating components still need further improvement. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one object of this invention is to provide a heating element, a cooking appliance, and a cooking device. This heating element has the advantages of high heat transfer efficiency, uniform heat transfer, and high heating stability, thereby significantly improving the cooking effect and service life of the cooking appliance and cooking device including the aforementioned heating element.

[0005] In one aspect of the invention, a heating element is provided, comprising two non-metallic plates and a heating layer located between the non-metallic plates. The heating layer comprises metal powder particles and an inorganic oxide matrix, wherein the metal powder particles are distributed in the inorganic oxide matrix, and in at least a portion of the heating layer, a plurality of the metal powder particles form a particle aggregate, the particle aggregate being arranged along the thickness direction of the heating layer. This improves the heating efficiency, heating uniformity, and heating stability of the heating element, while reducing thermal stress generated during heating and lowering the risk of cracking and delamination of the heating layer.

[0006] According to some embodiments of the present invention, in at least a portion of the heating layer, a plurality of said particle aggregates are spaced apart and / or adjacent to each other along the thickness direction of the heating layer. This reduces thermal stress generated during heating, promotes the absorption of thermal stress by the inorganic oxide matrix, improves the stability of the resistance of the heating element, and enhances the appearance of the heating element.

[0007] According to some embodiments of the present invention, in at least a portion of the heating layer, a plurality of the particle aggregates are spaced apart along the extending direction of the non-metallic plate. This ensures that the non-metallic plate is heated uniformly.

[0008] According to some embodiments of the present invention, in at least a portion of the heating layer, a plurality of the particle aggregates are staggered along the thickness direction of the heating layer. This ensures uniform heating of the non-metallic plate and reduces the risk of cracking.

[0009] According to some embodiments of the present invention, in at least a portion of the heating layer, the particle aggregates are connected by an inorganic oxide matrix having pores. This reduces thermal stress generated during heating and lowers the risk of cracking or detachment of the heating layer.

[0010] According to some embodiments of the present invention, the junction between the particulate aggregate and the inorganic oxide matrix has pores, and the size of the pores in the inorganic oxide matrix is ​​smaller than the size of the pores at the junction between the particulate aggregate and the inorganic oxide matrix. Therefore, the small pore size of the inorganic oxide matrix improves the stability of the inorganic oxide matrix structure and reduces the risk of interlayer peeling of the heating layer.

[0011] According to some embodiments of the present invention, the particle aggregates are arranged in the same direction along the extension direction of the non-metallic plate. This ensures that the non-metallic plate is heated uniformly.

[0012] According to some embodiments of the present invention, the particle aggregates are arranged parallel to the non-metallic plate. This ensures that the non-metallic plate is heated uniformly, reducing the risk of the non-metallic plate cracking.

[0013] According to some embodiments of the present invention, the particle aggregates are irregularly shaped, with the long axis of the particle aggregates along the extension direction of the non-metallic plate and the short axis of the particle aggregates along the thickness direction of the heating layer. This improves heating efficiency, ensures uniform heat transfer, and reduces the risk of cracking or detachment of the heating layer.

[0014] According to some embodiments of the present invention, in at least a portion of the heating layer, a plurality of the particle aggregates are arranged in layers along the thickness direction of the heating layer, with the particle aggregates in each layer spaced apart and / or adjacent to each other along the extension direction of the non-metallic plate. This improves heating efficiency, ensures uniform heat transfer, and reduces the risk of cracking or detachment of the heating layer.

[0015] According to some embodiments of the present invention, in at least a portion of the heating layer, adjacent layers of the particle aggregates are connected by the inorganic oxide matrix. This improves the uniformity of heat transfer and reduces heat accumulation in the heating layer.

[0016] According to some embodiments of the present invention, in at least a portion of the heating layer, the particle aggregates are disposed away from the non-metallic plate, and the particle aggregates and the non-metallic plate are separated by the inorganic oxide matrix. This improves the uniformity of heat transfer, prevents the non-metallic plate from cracking, and reduces noise during the heating process to some extent.

[0017] According to some embodiments of the present invention, in at least a portion of the heating layer, the particle aggregates in the heating layer are disposed away from the central region of the heating layer. This avoids heat concentration in the central part of the heating layer, preventing it from detaching, and to some extent avoids the formation of bubbles in the heating element.

[0018] According to some embodiments of the present invention, the heating layer is embedded in the non-metallic plate, and the contact interface between the heating layer and the non-metallic plate is an uneven interface. This improves the uniformity of heat transfer to the non-metallic plate.

[0019] According to some embodiments of the present invention, the non-metallic plates have different thicknesses.

[0020] In another aspect of the invention, a heating assembly is provided, comprising two non-metallic plates and a heating layer located between the non-metallic plates. The heating layer comprises metal powder particles and an inorganic oxide matrix, wherein the metal powder particles are distributed in the inorganic oxide matrix. In at least a portion of the heating layer, along the thickness direction of the heating layer, the content of the metal powder particles exhibits a trend of first increasing, then decreasing, and then increasing again. This avoids heat concentration in the center of the heating layer and improves the uniformity of heat transfer.

[0021] According to some embodiments of the present invention, in at least a portion of the heating layer, along the thickness direction of the heating layer from one side surface to the other, the content of the metal powder particles exhibits a trend of first increasing, then decreasing, then increasing again, and then decreasing again. This improves the uniformity of heat transfer.

[0022] According to some embodiments of the present invention, in at least a portion of the heating layer, along the thickness direction of the heating layer from one side surface to the other side surface, the content of silicon, oxygen, or aluminum all exhibits a trend of first decreasing, then increasing, then decreasing again, and then increasing again.

[0023] According to some embodiments of the present invention, in at least a portion of the heating layer, along the thickness direction of the heating layer from one side surface to the other side surface, the content of the metal powder particles decreases in the corresponding region, while the content of silicon, oxygen, or aluminum increases; and / or in at least a portion of the heating layer, along the thickness direction of the heating layer from one side surface to the other side surface, the content of the metal powder particles increases in the corresponding region, while the content of silicon, oxygen, or aluminum decreases.

[0024] According to some embodiments of the present invention, in at least a portion of the heating layer, along the thickness direction of the heating layer from one side surface to the other, the metal powder particles increase in content, forming particle aggregates. This improves the heating efficiency and uniformity of the heating element, while reducing thermal stress generated during heating and lowering the risk of cracking and delamination of the heating layer.

[0025] According to some embodiments of the present invention, the particle aggregates are arranged along the extending direction of the non-metallic plate. This facilitates heat transfer to the non-metallic plate.

[0026] According to some embodiments of the present invention, the region corresponding to the increase in the content of silicon, oxygen or aluminum is the inorganic oxide matrix.

[0027] According to some embodiments of the present invention, the inorganic oxide matrix material includes at least one of SiO2, Bi2O3, Al2O3, B2O3, ZnO, TiO2 and Na2O; and / or the metal powder particles are any one of silver, copper and aluminum; and / or the content of the metal powder particles accounts for 60% to 90% of the total mass of the heating layer.

[0028] In another aspect of the invention, a cooking appliance is provided, comprising: a container body and the aforementioned heating element, wherein the heating element is disposed within the container body. Thus, this cooking appliance possesses all the features and advantages of the aforementioned heating element, which will not be repeated here. In general, it has at least the advantages of fast heat transfer, uniform heat transfer, good heating stability, and long service life.

[0029] According to some embodiments of the present invention, the thickness of the non-metallic plate closer to the material to be heated is less than the thickness of the non-metallic plate farther from the material to be heated. This improves heat utilization and, to some extent, reduces the risk of the second non-metallic plate cracking.

[0030] In another aspect of the invention, a cooking device is provided, comprising the aforementioned cooking utensil and a base. Thus, the cooking device possesses all the features and advantages of the aforementioned cooking utensil, which will not be repeated here. In general, it has at least the advantages of fast heat transfer, uniform heat transfer, good heating stability, and long service life. Attached Figure Description

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 A schematic diagram of the structure of a heating component according to an embodiment of the present invention is shown;

[0033] Figure 2 A schematic diagram of the structure of a heating component according to another embodiment of the present invention is shown;

[0034] Figure 3 A schematic diagram of the structure of a heating component according to another embodiment of the present invention is shown;

[0035] Figure 4 A schematic diagram of the structure of a heating component according to another embodiment of the present invention is shown;

[0036] Figure 5 A schematic diagram of the structure of a heating component according to another embodiment of the present invention is shown;

[0037] Figure 6 A schematic diagram of the structure of a heating component according to another embodiment of the present invention is shown;

[0038] Figure 7 A schematic diagram of the structure of a heating component according to another embodiment of the present invention is shown;

[0039] Figure 8 A schematic diagram of the structure of a heating component according to another embodiment of the present invention is shown;

[0040] Figure 9 A schematic diagram of the structure of a heating component according to another embodiment of the present invention is shown;

[0041] Figure 10 The elemental composition distribution diagram of a heating component according to another embodiment of the present invention is shown;

[0042] Figure 11 A schematic diagram of the structure of a cooking appliance according to an embodiment of the present invention is shown;

[0043] Figure 12 A schematic diagram of the structure of a cooking device according to an embodiment of the present invention is shown.

[0044] Figure label:

[0045] 100: First non-metallic plate; 200: Heating layer; 210: Particle aggregate; 220: Inorganic oxide matrix; 300: Second non-metallic plate; 1000: Cooking utensil; 1100: Heating component; 1200: Container body; 2000: Cooking equipment; 3000: Base. Detailed Implementation

[0046] The embodiments of the present invention are described in detail below. These embodiments are exemplary and are only used to explain the present invention, and should not be construed as limiting the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in the art or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all commercially available conventional products.

[0047] In one aspect of the invention, a heating component is provided, with reference to... Figure 1 and Figure 7 The heating component includes two non-metallic plates and a heating layer 200 located between the non-metallic plates. The two non-metallic plates are a first non-metallic plate 100 and a second non-metallic plate 300. Specifically, the first non-metallic plate 100 and the second non-metallic plate 300 are arranged opposite each other and spaced apart. Preferably, the first non-metallic plate 100 and the second non-metallic plate 300 are arranged in parallel, and the heating layer 200 is located in the gap between the first non-metallic plate 100 and the second non-metallic plate 300. According to some embodiments of the present invention, the specific thickness of the second non-metallic plate 300 is not particularly limited, and those skilled in the art can select it according to actual conditions. Specifically, as the thickness of the second non-metallic plate 300 increases, the temperature difference inside the second non-metallic plate 300 during heating also increases, and the thermal stress increases; while the thinner the second non-metallic plate 300, the lower the strength, and the higher the risk of cracking during the installation of the heating layer 200. Therefore, the thickness of the second non-metallic plate 300 can be adjusted and selected according to specific needs such as thermal stress and mechanical strength.

[0048] According to some embodiments of the present invention, the thickness of the first non-metallic plate 100 is not particularly limited, and those skilled in the art can select it according to actual conditions. Similarly, as the thickness of the first non-metallic plate 100 increases, its mechanical strength increases, which can reduce the risk of cracking to a certain extent during use; while if the thickness of the first non-metallic plate 100 is too small, its mechanical strength decreases. Therefore, those skilled in the art can select the thickness of the first non-metallic plate 100 according to actual needs. Meanwhile, during use, if the first non-metallic plate 100 is the side in contact with the object to be heated, and the second non-metallic plate 300 is the side away from the object to be heated, then the thickness of the second non-metallic plate 300 should be greater than the thickness of the first non-metallic plate 100, thereby shortening the distance heat is transferred to the first non-metallic plate 100, increasing the heat transfer rate, and improving heat utilization. Conversely, the thickness of the first non-metallic plate 100 should be greater than the thickness of the second non-metallic plate 300. Furthermore, those skilled in the art can select the specific materials of the first non-metallic plate 100 and the second non-metallic plate 300 according to actual needs, as long as they can withstand high temperatures. For example, the first non-metallic plate 100 and the second non-metallic plate 300 can each independently include one of ceramic, microcrystalline glass, and borosilicate glass. Specifically, the materials of the first non-metallic plate 100 and the second non-metallic plate 300 can both be ceramic, or both can be glass, or one of the first non-metallic plate 100 and the second non-metallic plate 300 can be made of glass and the other of ceramic. Those skilled in the art can choose according to the overall appearance of the product.

[0049] According to an embodiment of the present invention, reference Figure 2 and Figure 8 The heating layer 200 includes metal powder particles and an inorganic oxide matrix 220. The metal powder particles are distributed in the inorganic oxide matrix 220, for example, the metal powder particles fill at least a portion of the pores in the inorganic oxide matrix 220, and in at least a portion of the heating layer 200, a plurality of metal powder particles form a particle aggregate 210, the particle aggregate 210 being arranged along the thickness direction of the heating layer 200. Figure 8The metallic-lustered particles are aggregates, while the remaining colloidal material is an inorganic oxide matrix. The inventors discovered that after multiple metal powder particles aggregate to form aggregates 210 in the heating layer 200, heat in the heating layer 200 can be rapidly transferred along the aggregates 210, improving the heating efficiency of the heating layer 200. Furthermore, the aggregates 210 are distributed along the thickness direction of the heating layer 200, ensuring that the heat generated by the heating layer 200 is evenly transferred to both sides of the heating layer 200, improving the heating uniformity, reducing heat accumulation on one side of the heating layer 200, and improving the stability of the heating component. In addition, the presence of the inorganic oxide matrix 220 between the multiple aggregates 210 can disperse the thermal stress generated during the heating process, thereby reducing the risk of cracking and interlayer delamination in the heating layer 200 and improving the service life of the heating component.

[0050] It should be explained that, unless otherwise specified, "particle aggregate" in this application can be understood as an aggregate formed by multiple metal particles in contact with each other.

[0051] According to an embodiment of the present invention, the connection between the particulate aggregate 210 and the inorganic oxide matrix 220 has pores (not shown in the figure). The size of the pores in the inorganic oxide matrix 220 is smaller than the size of the pores at the connection between the particulate aggregate 210 and the inorganic oxide matrix 220. The inventors have found that if the size of the pores in the inorganic oxide matrix 220 is too large, the bonding force between the inorganic oxide matrices 220 is weak and the bonding is not firm, which may cause breakage during heating. In other words, the small pore size of the inorganic oxide matrix 220 can improve the stability of the inorganic oxide matrix 220 structure, improve the bonding force between the inorganic oxide matrices 220, reduce the risk of interlayer peeling of the heating layer 200, and extend the service life of the heating component.

[0052] According to some embodiments of the present invention, the metal powder particles in the heating layer 200 include weakly magnetic metal materials. It should be specifically noted that weakly magnetic metal materials refer to metal materials with a relative permeability of less than 1. According to some embodiments of the present invention, the type of weakly magnetic metal material is not limited, and those skilled in the art can select it as needed; for example, it can be silver, aluminum, copper, etc. According to other embodiments of the present invention, the inorganic oxide matrix in the heating layer 200 can be any porous inorganic oxide, including at least one of silicon oxide, bismuth oxide, magnesium oxide, and potassium oxide. Furthermore, to improve the heating effect of the heating component, the content of the inorganic oxide matrix 220 in the heating layer 200 is 10-40% (mass percentage), and the content of the weakly magnetic metal material is 60-90% (mass percentage).

[0053] According to some embodiments of the present invention, the area of ​​the heating layer 200 in the heating component is not particularly limited. Preferably, in order to improve the utilization rate of the heat generated by the heating layer 200, the orthographic projection of the heating layer 200 on the first non-metallic plate 100 or the second non-metallic plate 300 is not greater than the area of ​​the first non-metallic plate 100 or the area of ​​the second non-metallic plate 300. In other words, the area of ​​the heating layer 200 is the same as or smaller than the areas of the first non-metallic plate 100 and the second non-metallic plate 300.

[0054] Therefore, when the heating element and cooking appliance are combined by welding, the softening of the first non-metallic plate 100 and the second non-metallic plate 300 after heating will not adversely affect the heating layer 200, and thus will not affect the use of the final product. Those skilled in the art should understand that regardless of how the heating element is combined with the cooking appliance, the space between the heating element and the cooking appliance after combination is a sealed space, or other arrangements may be made. Those skilled in the art can configure the space according to the actual situation, as long as a sealed space can be formed.

[0055] It should be noted that in this invention, "same area" should be interpreted broadly, that is, the area of ​​the heating layer 200 does not need to be strictly controlled to be consistent with the area of ​​the first glass non-metallic plate 100 and the second non-metallic plate 300, but can be approximately the same, for example, as long as no significant difference in area can be observed with the naked eye.

[0056] According to some embodiments of the present invention, the specific formation method of the heating layer 200 is not particularly limited. Those skilled in the art can select and set it according to the actual situation. For example, the heating layer 200 can be formed by pasting a metal film layer on the first non-metallic plate 100 and the second non-metallic plate 300, or by performing a water transfer printing method on the first non-metallic plate 100 and the second non-metallic plate 300, or by thermal spraying on the first non-metallic plate 100 and the second non-metallic plate 300. In the present invention, the specific conditions for pasting the metal film layer, water transfer printing method and thermal spraying are not particularly limited, as long as a uniform and flat heating layer 200 can be formed.

[0057] According to some embodiments of the present invention, the heating layer 200 can be bonded to the first non-metallic plate 100 and the second non-metallic plate 300 by sintering and curing. Thus, the heating layer 200 can be firmly bonded to the first non-metallic plate 100 and the second non-metallic plate 300. When the two are bonded by sintering and curing, the sintering and curing temperature of the heating layer 200 is lower than the softening temperature of the first non-metallic plate 100 and the second non-metallic plate 300. Therefore, the first non-metallic plate 100 and / or the second non-metallic plate 300 will not deform during the sintering and curing process.

[0058] It should be noted that when the heating layer 200 is connected to the first non-metallic plate 100 and the second non-metallic plate 300 by sintering and curing, the interface between the heating layer 200 and the non-metallic plate (at least one of the first non-metallic plate 100 and the second non-metallic plate 300) can be interlocked rather than a flat interface.

[0059] According to some embodiments of the present invention, the heating layer 200 can also be connected to the first non-metallic plate 100 and / or the second non-metallic plate 300 via a heat-cured adhesive layer. For example, during use, the first non-metallic plate 100 is the side in contact with the object to be heated, while the second non-metallic plate 300 is the side away from the object to be heated. In this case, the heating layer 200 is connected to the first non-metallic plate 100 by sintering and curing, and the heating layer 200 is connected to the second non-metallic plate 300 via an adhesive layer. This increases the thermal resistance between the heating layer 200 and the second non-metallic plate 300, reduces the heat transfer rate to the second non-metallic plate 300, increases the heat transfer efficiency to the first non-metallic plate 100, and thus improves heat utilization. It should be particularly noted that the sintering and curing temperature of the heating layer 200 is lower than the softening temperature of the first non-metallic plate 100, and the heat-curing temperature of the adhesive layer is lower than the softening temperature of the second non-metallic plate 300. Therefore, the heating layer 200 can be firmly bonded to the first non-metallic plate 100 and the second non-metallic plate 300, and the first non-metallic plate 100 and the second non-metallic plate 300 will not deform during the connection.

[0060] According to some embodiments of the present invention, during use, the second non-metallic plate 300 is in contact with the object to be heated, while the first non-metallic plate 100 is away from the object. In this case, the heating layer 200 and the first non-metallic plate 100 can be connected by an adhesive layer, and the heating layer 200 and the second non-metallic plate 300 can be connected by sintering and curing. This increases the thermal resistance between the heating layer 200 and the first non-metallic plate 100, reduces the heat transfer rate to the first non-metallic plate 100, and increases the heat transfer efficiency to the second non-metallic plate 300, thereby improving heat utilization. It should be particularly noted that the curing temperature of the adhesive layer is lower than the softening temperature of the first non-metallic plate 100, and the sintering and curing temperature of the heating layer 200 is lower than the softening temperature of the first non-metallic plate 100. Therefore, the heating layer 200 can be firmly bonded to the first non-metallic plate 100 and the second non-metallic plate 300, and the first and second non-metallic plates 100 will not deform during connection.

[0061] According to some embodiments of the present invention, the heating layer 200 is connected to both the first non-metallic plate 100 and the second non-metallic plate 300 via an adhesive layer. It should be particularly noted that the heat-curing temperature of the adhesive layer is lower than the softening temperature of the first non-metallic plate 100 and the second non-metallic plate 300. Therefore, the heating layer 200 can be firmly bonded to the first non-metallic plate 100 and the second non-metallic plate 300, and the first and second non-metallic plates 100 and 300 will not deform during the connection process. It should be noted that those skilled in the art can select the specific conditions for heat-curing and sintering of the adhesive layer according to actual needs, as long as a firm bond between the heating layer 200 and the first non-metallic plate 100 and / or the second non-metallic plate 300 is achieved; further details are omitted here.

[0062] It should be noted that there are no special restrictions on the arrangement of the particle aggregates 210 in the heating layer 200, and those skilled in the art can design them according to product requirements.

[0063] For example, refer to Figure 1 In at least a portion of the heating layer 200, multiple particle aggregates 210 are spaced apart along the thickness direction of the heating layer 200, as shown in the reference. Figure 2 In at least a portion of the heating layer 200, multiple particle aggregates 210 are arranged adjacent to each other along the thickness direction of the heating layer 200. It should be noted that the adjacent particle aggregates 210 are not limited to two, but can be three or more. When heated, the adjacent or spaced particle aggregates 210 can disperse the thermal stress generated by heating, promote the absorption of thermal stress by the inorganic oxide matrix 220, and improve the stability of the resistance of the heating element. It should be noted that in at least a portion of the heating layer 200, a portion of the multiple particle aggregates 210 are spaced apart along the thickness direction of the heating layer 200, while another portion is arranged adjacent to each other along the thickness direction of the heating layer 200. That is, the multiple particle aggregates 210 in the heating layer 200 include a combination of spaced-apart and adjacent arrangements.

[0064] According to other embodiments of the present invention, reference is made to Figure 3 In at least a portion of the heating layer, multiple particle aggregates 210 are spaced apart along the extending direction of the first non-metallic plate 100 and / or the second non-metallic plate 300, as shown in the attached figure. Figure 3The arrangement of the particle aggregates 210 within the dashed area allows heat in the heating layer 200 to be rapidly transferred along the particle aggregates 210, improving the heating efficiency of the heating layer 200. Furthermore, the multiple particle aggregates 210 are spaced apart along the extension direction of the first non-metallic plate 100 and / or the second non-metallic plate 300, ensuring that the heat generated by the heating layer 200 is evenly transferred to both sides of the heating layer 200, improving the heating uniformity of the heating layer 200, reducing heat accumulation on one side of the heating layer 200, and improving the stability of the heating component. Additionally, the presence of the inorganic oxide matrix 220 between the multiple particle aggregates 210 can disperse the thermal stress generated during the heating process, thereby reducing the risk of cracking and interlayer delamination in the heating layer 200 and improving the service life of the heating component.

[0065] According to some specific embodiments of the present invention, reference is made to Figure 4 In at least a portion of the heating layer 200, multiple particle aggregates 210 are staggered along the thickness direction of the heating layer 200, i.e., attached... Figure 4 The arrangement of the particle aggregates 210 within the dashed area allows heat in the heating layer 200 to be rapidly transferred along the particle aggregates 210, improving the heating efficiency of the heating layer 200. Furthermore, the staggered arrangement of the particle aggregates 210 along the thickness direction of the heating layer 200 ensures that the heat generated by the heating layer 200 is evenly transferred to both sides of the heating layer 200, improving the heating uniformity of the heating layer 200, reducing heat accumulation on one side of the heating layer 200, and improving the stability of the heating component. In addition, the presence of the inorganic oxide matrix 220 between the multiple particle aggregates 210 can disperse the thermal stress generated during the heating process, thereby reducing the risk of cracking and interlayer detachment in the heating layer 200 and improving the service life of the heating component.

[0066] According to some embodiments of the present invention, reference Figure 3 The particle aggregates 210 are arranged in the same direction along the extending direction of the first non-metallic plate 100 and / or the second non-metallic plate 300, that is... Figure 3The arrangement of the particle aggregate 210 in the dotted-line region with the first non-metallic plate 100 and the second non-metallic plate 300 is as follows: Specifically, the particle aggregate 210 can be arranged parallel to the first non-metallic plate 100 and the second non-metallic plate 300. It should be noted that the parallel arrangement referred to here is not absolute parallelism, but rather that the particle aggregate 210 as a whole is generally parallel to the first non-metallic plate 100 and the second non-metallic plate 300. The inventors have discovered that if the particle aggregate 210 is along the extending direction of the first non-metallic plate 100 and the second non-metallic plate 300, the heat in the heating layer 200 can be carried along the particle aggregate 210. The aggregates 210 rapidly transfer heat, improving the heating efficiency of the heating layer 200. Furthermore, the aggregates 210 are arranged parallel to the first non-metallic plate 100 and the second non-metallic plate 300, improving the heating uniformity of the heating layer 200, reducing heat accumulation on one side of the heating layer 200, and improving the stability of the heating component. In addition, due to the presence of the inorganic oxide matrix 220 between the multiple aggregates 210, the inorganic oxide matrix 220 can disperse the thermal stress generated during the heating process of the aggregates 210, thereby reducing the risk of cracking and interlayer delamination of the heating layer 200 and improving the service life of the heating component.

[0067] Those skilled in the art should understand that the size and shape of the particle aggregates 210 formed by different metal powders agglomerating in the heating layer 200 will not be exactly the same. For example, the particle aggregates 210 may be irregular in shape, as shown in the reference. Figures 1-4 The long axis of the particle aggregate 210 is along the extension direction of the first non-metallic plate 100 and / or the second non-metallic plate 300, and the short axis of the particle aggregate 210 is along the thickness direction of the heating layer 200. This brings the long axis of the particle aggregate 210 as close as possible to the first non-metallic plate 100 and the second non-metallic plate 300, increasing the heat transfer area between the particle aggregate 210 and the first and second non-metallic plates 100 and 300, thereby improving the heat utilization rate of the heating layer 200. Simultaneously, the particle aggregate 210 is arranged in the same direction, which improves the uniformity of heat transfer, reduces heat accumulation in the heating layer 200, and reduces thermal stress generated during heating in the heating layer 200, thus reducing the risk of cracking and interlayer delamination in the heating layer 200.

[0068] It should be noted that the major axis refers to the longest line segment connecting two points on the particle aggregate 210, and the direction of the major axis is along the extension direction of this line segment; the minor axis refers to the shortest line segment connecting two points on the particle aggregate 210, and the direction of the minor axis is along the extension direction of this line segment.

[0069] According to some embodiments of the present invention, reference Figure 5 and Figure 6In at least a portion of the heating layer 200, the particle aggregates 210 are arranged in layers along the thickness direction of the heating layer 200. It should be noted that each layer may include multiple particle aggregates 210 along the thickness direction of the heating layer 200, as shown in the reference. Figure 5 In each layer, the particle aggregates 210 are spaced apart along the extending direction of the first non-metallic plate 100 and / or the second non-metallic plate 300, as shown in the reference. Figure 6 The particle aggregates 210 in each layer are arranged adjacent to each other along the extension direction of the first non-metallic plate 100 and / or the second non-metallic plate 300. As a result, the heat in the heating layer 200 can be quickly transferred along the particle aggregates 210, improving the heating efficiency of the heating layer 200. Furthermore, the particle aggregates 210 in each layer are arranged at intervals and / or adjacent to each other along the extension direction of the first non-metallic plate 100 and / or the second non-metallic plate 300, which improves the heating uniformity of the heating layer 200, reduces the accumulation of heat on one side of the heating layer 200, and improves the stability of the heating component. In addition, due to the presence of the inorganic oxide matrix 220 between the multiple particle aggregates 210, the inorganic oxide matrix 220 can disperse the thermal stress generated by the particle aggregates 210 during the heating process, thereby reducing the risk of cracking and interlayer delamination of the heating layer 200 and improving the service life of the heating component.

[0070] According to some specific embodiments of the present invention, two adjacent particle aggregates 210 are connected by an inorganic oxide matrix 220. Compared with the arrangement of directly connecting particle aggregates 210 to particle aggregates 210, this can reduce the small-scale accumulation of heat in the heating layer 200, thereby promoting the uniformity of heat transfer. At the same time, due to the porosity of the inorganic oxide matrix 220, heat in the heating layer 200 can be quickly transferred along the particle aggregates 210, improving the heating efficiency and heating uniformity of the heating layer 200, reducing the accumulation of heat on one side of the heating layer 200, and improving the stability of the heating component. In addition, due to the presence of the inorganic oxide matrix 220 between multiple particle aggregates 210, the inorganic oxide matrix 220 can disperse the thermal stress generated during the heating process of the particle aggregates 210, thereby reducing the risk of cracking and interlayer delamination of the heating layer 200 and improving the service life of the heating component.

[0071] According to some specific embodiments of the present invention, the particle aggregate 210 is disposed away from the first non-metallic plate 100 and / or the second non-metallic plate 300, that is, there is a certain distance between the particle aggregate 210 and the first non-metallic plate 100 and the second non-metallic plate 300, so as to avoid the particle aggregate 210 directly contacting the first non-metallic plate 100 and the second non-metallic plate 300, thereby reducing the risk of cracking of the first non-metallic plate 100 and the second non-metallic plate 300 during heating. According to some embodiments of the present invention, the particle aggregate 210 and the first non-metallic plate 100 and / or the second non-metallic plate 300 can be separated by an inorganic oxide matrix 220, which improves the uniformity of heat transfer to the non-metallic plate, reduces the risk of excessive noise caused by excessive heating power, and reduces the possibility of non-metallic plate cracking.

[0072] According to some embodiments of the present invention, the particle aggregates 210 in the heating layer 200 are disposed away from the middle region of the heating layer 200, that is, the middle region of the heating layer 200 is not the region where the particle aggregates 210 are most distributed. As a result, the content of particle aggregates 210 in the middle region of the heating layer 200 is relatively small, which can avoid heat accumulation in the middle of the heating layer 200 during the heating process, which would cause interlayer delamination of the heating layer 200. For example, it can prevent the delamination between the region where the particle aggregates 210 are more distributed and the region where the inorganic oxide matrix 220 is more distributed. At the same time, it can also reduce the bubbles generated during the heating process and prevent the formation of an air layer in the middle region of the heating layer 200. The inventors have found that if there is an air layer in the middle region of the heating layer 200, it will affect the electrical parameters and inductive resistance of the heating layer 200, and affect the heating effect.

[0073] According to some embodiments of the present invention, the heating layer 200 is embedded in the first non-metallic plate 100 and / or the second non-metallic plate 300, and the contact interface between the heating layer 200 and the first non-metallic plate 100 and / or the second non-metallic plate 300 is a concave-convex interface. Thus, when the contact point between the heating layer 200 and the first non-metallic plate 100 and the second non-metallic plate 300 is a convex point, the corresponding contact point between the first non-metallic plate 100 and the second non-metallic plate 300 and the heating layer 200 is a concave point; when the contact point between the heating layer 200 and the first non-metallic plate 100 and the second non-metallic plate 300 is a concave point, the corresponding contact point between the first non-metallic plate 100 and the second non-metallic plate 300 and the heating layer 200 is a convex point. This improves the adhesion between the heating layer 200 and the first non-metallic plate 100 and the second non-metallic plate 300, thereby increasing heat utilization efficiency.

[0074] In another aspect of the invention, a heating assembly is provided, with reference to Figure 1The heating element includes a heating layer 200 between two non-metallic plates and a non-metallic plate 300. The non-metallic plates include a first non-metallic plate 100 and a second non-metallic plate 300. Preferably, the first non-metallic plate 100 and the second non-metallic plate 300 are arranged in parallel. The heating layer 200 includes metal powder particles and an inorganic oxide matrix 220. The metal powder particles of the heating layer 200 are distributed in the inorganic oxide matrix 220. In at least a portion of the heating layer, the metal powder particles can form particle aggregates 210. The particle aggregates 210 are spaced apart and / or adjacent to each other along the thickness direction of the heating layer 200. Along the thickness direction of the heating layer 200, the content of metal powder particles shows a trend of first increasing, then decreasing and then increasing again. Compared with the distribution pattern where the content of metal powder particles first increases and then decreases, this distribution pattern means that the middle area is not a heat concentration area, which can avoid interlayer delamination of the heating layer caused by heating, improve the service life of the heating element, and improve the uniformity of heat transfer.

[0075] According to some embodiments of the present invention, reference Figure 9 and Figure 10 In at least a portion of the heating layer 200, along the thickness direction of the heating layer 200, from one side surface of the heating layer 200 to the other side surface, the content of metal powder particles exhibits a trend of first increasing, then decreasing, then increasing again, and then decreasing again. Correspondingly, from one side surface of the heating layer 200 to the other side surface, the content of silicon, oxygen, or aluminum elements all exhibit a trend of first decreasing, then increasing, then decreasing again, and then increasing again. It should be specifically noted that in the regions where the content of metal powder particles decreases, the content of silicon, oxygen, or aluminum elements increases; in the regions where the content of metal powder particles increases, the content of silicon, oxygen, or aluminum elements decreases; and in the regions where the content of silicon, oxygen, or aluminum elements increases, the inorganic oxide matrix is ​​present. According to some embodiments of the present invention, the material of the inorganic oxide matrix 220 is not particularly limited, and for example, it can be selected from at least one of SiO2, Bi2O3, Al2O3, B2O3, ZnO, TiO2, and Na2O. According to some embodiments of the present invention, the metal powder can be a weakly magnetic metal material. It should be specifically noted that a weakly magnetic metal material refers to a material with a relative permeability of less than 1. According to some embodiments of the present invention, the type of weakly magnetic metal material is not particularly limited, and those skilled in the art can select it as needed. For example, it can be silver, aluminum, copper, etc. The content of metal powder particles accounts for 60% to 90% of the total mass of the heating layer.

[0076] According to some embodiments of the present invention, in areas where the content of metal powder particles increases, i.e., areas with a relatively high content of metal powder particles, the metal powder particles aggregate to form particle aggregates, improving the heating efficiency and heating uniformity of the heating component. Simultaneously, the gaps between the particle aggregates can reduce the thermal stress generated during heating, reducing the risk of cracking and interlayer delamination of the heating layer 200. According to some specific embodiments of the present invention, the particle aggregates 220 are arranged along the extending direction of the first non-metallic plate 100 and / or the second non-metallic plate 300.

[0077] It should be noted that the material and thickness of the non-metallic plate, the material and thickness of the heating layer, the connection method between the non-metallic plate and the heating layer, the distribution method of the particle aggregates in the heating layer, and the distribution method of the particle aggregates and the inorganic oxide matrix in the heating component refer to the heating component proposed in the first aspect of this application.

[0078] In another aspect of the invention, a cooking utensil is provided, with reference to Figure 11 The cooking appliance 1000 includes a container body 1200 and the aforementioned heating element 1100. The heating element 1100 is disposed within the container body 1200, and a first non-metallic plate on the heating element 1100 is arranged facing the upper end of the container body 1200. Therefore, the cooking appliance possesses all the features and advantages of the aforementioned heating element 1100, which will not be elaborated further here. In general, it has at least the advantages of fast heat transfer, good heat transfer stability, and long service life.

[0079] According to some embodiments of the present invention, the heating element 1100 constitutes the bottom of the container body 1200, and the heating element 1100 is detachably connected to the side wall of the container body 1200. Specifically, the connection can be achieved by welding, or by other means. Those skilled in the art can configure it according to actual conditions, as long as a good fit can be achieved.

[0080] According to some embodiments of the present invention, when the first non-metallic plate 100 is the side in contact with the object to be heated and the second non-metallic plate 300 is the side away from the object to be heated, the thickness of the second non-metallic plate 300 is greater than the thickness of the first non-metallic plate 100. This shortens the distance heat is transferred to the first non-metallic plate 100, increases the heat transfer rate, and improves heat utilization. Specifically, ensuring that the rate at which heat generated by the heating layer 200 is transferred to the first non-metallic plate 100 is greater than the rate at which it is transferred to the second non-metallic plate 300 can be achieved by adjusting the thickness of the first non-metallic plate 100 and the second non-metallic plate 300, or by methods including but not limited to adjusting the materials of the first non-metallic plate 100 and the second non-metallic plate 300, or by adding a heat insulation layer on the side away from the heating surface.

[0081] According to some embodiments of the present invention, the materials of the first non-metallic plate 100 and the second non-metallic plate 13 are not particularly limited, and those skilled in the art can select them according to actual needs. For example, the first non-metallic plate 100 and the second non-metallic plate 300 can each independently include one of ceramic, microcrystalline glass, and borosilicate glass. Microcrystalline glass can be made transparent, with a zero coefficient of thermal expansion, surface-strengthened, or in different colors or machinable, by controlling the type, quantity, and size of the microcrystals. This improves the appearance of the product and meets the selection needs of consumers with different preferences. In addition, microcrystalline glass possesses the dual characteristics of glass and ceramic. Like ceramic, microcrystalline glass is composed of crystals, meaning its atoms are arranged in a regular pattern. Therefore, microcrystalline glass has higher brightness than ceramic and stronger toughness than glass, thus meeting higher consumer requirements. Borosilicate glass has a low coefficient of thermal expansion, high physical strength, and stronger impact resistance, thereby extending the service life of the heating element.

[0082] For example, the first non-metallic plate 100 and the second non-metallic plate 300 can both be made of ceramic. Ceramic has a warm and jade-like appearance, and its heat dissipation performance is relatively excellent among inorganic materials. Therefore, using ceramic to form the first non-metallic plate 100 and the second non-metallic plate 300 can, on the one hand, create a consistent visual effect with the ceramic exterior of the health pot when applied to it, thus improving the user experience; on the other hand, it also facilitates heat dissipation.

[0083] For example, both the first non-metallic plate 100 and the second non-metallic plate 300 can be glass. This allows for the formation of a glass pot with an integrated bottom and sidewalls, and the inner inorganic layer can be thinner, thus significantly reducing the overall thickness of the heating element 1100. When both are glass, the inner glass can also be microcrystalline glass or borosilicate glass. More specifically, the glass in the first non-metallic plate 100 and the second non-metallic plate 300 closest to the water or food to be heated can be made of a glass material with a higher thermal conductivity, while the outer glass can be made of a material with a lower thermal conductivity. This allows the heat from the heating layer 200 to be transferred to the water or food to be heated more quickly and efficiently, improving heating efficiency and preventing overheating of the heating element. Furthermore, using integrated glass for the bottom and sidewalls simplifies the manufacturing process.

[0084] Alternatively, one side of the first non-metallic plate 100 and the second non-metallic plate 300 may be glass, and the other side may be ceramic. Specifically, the non-metallic plate on the heating side of the heating element 1100 can be ceramic, and the other non-metallic plate can be glass. Because ceramic has advantages such as high density, water resistance, and rapid heat dissipation, when the heating element 1100 is heated, the heat can be quickly transferred to the water or food being heated through the ceramic material. Alternatively, the non-metallic plate on the heating side of the heating element 1100 can also be glass, and the other non-metallic plate can be ceramic. In this case, because the mechanical strength of ceramic material is superior to that of glass material, it can protect the outer side of the heating element 1100 to a certain extent.

[0085] In another aspect of the invention, a cooking apparatus is provided, with reference to Figure 12 The cooking device 2000 includes the aforementioned cooking utensil 1000 and base 3000. Thus, the cooking device 2000 possesses all the features and advantages of the aforementioned cooking utensil 1000, which will not be repeated here. In general, it has at least the advantages of fast heat transfer, uniform heat transfer, and long service life.

[0086] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0088] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0089] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0090] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A heating element, characterized in that, It includes two non-metallic plates and a heating layer located between the non-metallic plates; The heating layer comprises metal powder particles and an inorganic oxide matrix. The metal powder particles are distributed in the inorganic oxide matrix, and in at least a portion of the heating layer, a plurality of the metal powder particles form a particle aggregate, which is arranged along the thickness direction of the heating layer.

2. The heating component according to claim 1, characterized in that, In at least a portion of the heating layer, a plurality of the particle aggregates are spaced apart and / or adjacent to each other along the thickness direction of the heating layer.

3. The heating component according to claim 1, characterized in that, In at least a portion of the heating layer, a plurality of the particle aggregates are spaced apart along the extension direction of the non-metallic plate.

4. The heating component according to claim 1, characterized in that, In at least a portion of the heating layer, a plurality of the particle aggregates are arranged alternately along the thickness direction of the heating layer.

5. The heating component according to any one of claims 1 to 4, characterized in that, In at least a portion of the heating layer, the particle aggregates are connected by the inorganic oxide matrix, which has pores.

6. The heating component according to claim 5, characterized in that, The particle aggregate has pores at the junction with the inorganic oxide matrix, and the size of the pores in the inorganic oxide matrix is ​​smaller than the size of the pores at the junction with the particle aggregate.

7. The heating component according to claim 3, characterized in that, The plurality of said particle aggregates are arranged in the same direction along the extension direction of the non-metallic plate.

8. The heating element according to claim 7, characterized in that, The particle aggregates are arranged parallel to the non-metallic plate.

9. The heating element according to any one of claims 6 to 8, characterized in that, The particle aggregates are irregularly shaped, with the long axis of the particle aggregates along the extension direction of the non-metallic plate and the short axis of the particle aggregates along the thickness direction of the heating layer.

10. The heating component according to claim 2, characterized in that, In at least a portion of the heating layer, a plurality of the particle aggregates are arranged in layers along the thickness direction of the heating layer, with the particle aggregates in each layer spaced apart and / or adjacent to each other along the extension direction of the non-metallic plate.

11. The heating component according to claim 10, characterized in that, In at least a portion of the heated layer, adjacent particle aggregates are connected by the inorganic oxide matrix.

12. The heating component according to claim 1, characterized in that, In at least a portion of the heating layer, the particle aggregates are disposed away from the non-metallic plate, and the particle aggregates and the non-metallic plate are separated by the inorganic oxide matrix.

13. The heating component according to claim 1, characterized in that, In at least a portion of the heating layer, the particle aggregates in the heating layer are disposed away from the central region of the heating layer.

14. The heating component according to claim 1, characterized in that, The heating layer is embedded in the non-metallic plate, and the contact interface between the heating layer and the non-metallic plate is a concave-convex interface.

15. The heating component according to claim 1, characterized in that, The non-metallic plates have different thicknesses.

16. A heating element, characterized in that, It comprises two non-metallic plates and a heating layer located between the non-metallic plates. The heating layer includes metal powder particles and an inorganic oxide matrix, wherein the metal powder particles are distributed in the inorganic oxide matrix. In at least a portion of the heating layer, along the thickness direction of the heating layer, the content of the metal powder particles shows a trend of first increasing, then decreasing, and then increasing again.

17. The heating component according to claim 16, characterized in that, In at least a portion of the heating layer, along the thickness direction of the heating layer from one side surface to the other, the content of the metal powder particles exhibits a trend of first increasing, then decreasing, then increasing again, and then decreasing again.

18. The heating element according to claim 16, characterized in that, In at least a portion of the heating layer, along the thickness direction of the heating layer, from one side surface to the other, the content of silicon, oxygen, or aluminum all show a trend of first decreasing, then increasing, then decreasing again, and then increasing again.

19. The heating element according to claim 18, characterized in that, In at least a portion of the heating layer, along the thickness direction of the heating layer from one side surface to the other, the area corresponding to the decrease in the content of the metal powder particles has an increase in the content of silicon, oxygen, or aluminum, and / or in at least a portion of the heating layer, along the thickness direction of the heating layer from one side surface to the other, the area corresponding to the increase in the content of the metal powder particles has a decrease in the content of silicon, oxygen, or aluminum.

20. The heating element according to any one of claims 16 to 19, characterized in that, In at least a portion of the heating layer, along the thickness direction of the heating layer from one side surface to the other, the metal powder particles aggregate to form particle aggregates.

21. The heating component according to claim 20, characterized in that, The particle aggregates are arranged along the extension direction of the non-metallic plate.

22. The heating element according to claim 18, characterized in that, The region corresponding to the increase in the content of silicon, oxygen, or aluminum is the inorganic oxide matrix.

23. The heating component according to claim 1 or 16, characterized in that, The inorganic oxide matrix material includes at least one selected from SiO2, Bi2O3, Al2O3, B2O3, ZnO, TiO2, and Na2O; and / or The metal powder particles are any one of silver, copper, and aluminum; and / or The content of the metal powder particles accounts for 60% to 90% of the total mass of the heating layer.

24. A cooking utensil, characterized in that, include: Container body; A heating element is disposed within the container body, and the heating element is the heating element according to any one of claims 1-23.

25. The cooking utensil according to claim 24, characterized in that, The thickness of the non-metallic plate closer to the material to be heated is less than the thickness of the non-metallic plate farther away from the material to be heated.

26. A cooking appliance, characterized in that, The cooking apparatus includes the cooking utensil as described in claim 24 or 25 and a base.

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