Cooking appliance, method for preparing a cooking appliance, and cooking device

Abstract

The present invention provides a cooking utensil and a cooking device. The cooking utensil includes: a container body, the inner surface of the container body is divided into a first surface and a second surface, the first surface and the second surface form a cavity, and the relationship between the first surface and the second surface satisfies at least one of the following conditions: the surface roughness of the first surface is less than the surface roughness of the second surface; the glossiness of the first surface is greater than the glossiness of the second surface. By adjusting the surface roughness and / or glossiness, the absorption and reflection capabilities of the surface of the cooking utensil for far-infrared light waves can be adjusted, so that after the first part is heated, the heat mainly diverges, while the second part mainly absorbs heat, so that the cavity of the cooking utensil is evenly heated, and thus the food to be heated can be better heated.

Description

Technical Field

[0001] The present invention relates to the field of household appliances, and in particular, to cooking utensils, methods for preparing cooking utensils, and cooking equipment. Background Art

[0002] With the improvement of living standards, people's requirements for food, clothing, housing, transportation, household appliances, the quality of the living environment, and the level of hygiene are constantly increasing. Healthy diet has become an important topic closely related to human health. Due to its excellent properties such as high temperature resistance, corrosion resistance, being able to ensure the original flavor of food during cooking, and easy to clean, ceramic materials are highly trusted by consumers. Products such as ceramic stew pots and ceramic inner liners have become star products in the market. However, ceramic materials themselves cannot conduct magnetism and cannot be electromagnetically heated. Therefore, organically combining such products with existing electromagnetic heating technologies has become an urgent problem for product developers to solve. Currently, the relatively mature technology is to attach a magnetic conductive film or print a magnetic conductive layer on the ceramic inner liner. However, the magnetic conductive layer can only heat the bottom of the ceramic, resulting in a slow heating speed at the upper end of the cooking utensil, a large temperature difference between the side and the bottom, and uneven heating of the ceramic inner liner.

[0003] Therefore, the current cooking utensils, methods for preparing cooking utensils, and cooking equipment still need to be further improved. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0005] To this end, an object of the present invention is to provide a cooking utensil. The cooking utensil has a container body, and the inner surface of the container body is divided into a first surface and a second surface. The first surface and the second surface form a cavity. The relationship between the first surface and the second surface satisfies at least one of the following conditions: the surface roughness of the first surface is greater than that of the second surface; the glossiness of the first surface is greater than that of the second surface. Thus, the first surface has a higher roughness. After the first surface is heated, the diffuse reflection of far-infrared light waves on the first surface is improved, so that the far-infrared light waves on the first surface diverge in all directions, that is, the heat can diverge in all directions; while the second surface has a lower roughness, and the diffuse reflection of far-infrared light waves on the second surface is weaker, so that the far-infrared light waves are concentrated at the second surface, that is, the unheated second surface can concentrate the heat and make the cooking utensil heated evenly. The first surface has a higher glossiness, which can improve the divergence ability of far-infrared light waves, that is, the heat can diverge in all directions; the second surface has a lower glossiness, which can improve the absorption ability of far-infrared light waves and make the cooking utensil heated evenly.

[0006] According to an embodiment of the present invention, the first surface and the second surface are spaced apart.

[0007] According to an embodiment of the present invention, the container body is divided into a first part and a second part. The first part is at least located at the bottom of the container body, and the second part is located above the first part. Thereby, the performance of the cooking appliance is improved.

[0008] According to an embodiment of the present invention, the first part further includes a part of the side wall of the container body near the bottom. Thereby, the performance of the cooking appliance is improved.

[0009] According to an embodiment of the present invention, the first part has a first surface and a second surface. The first surface is outside and spaced from the second surface, and the second surface is arranged in the central area of the bottom of the container. Thereby, heat concentration caused by too fast temperature rise at the bottom is avoided, and the temperature uniformity of the container body is improved.

[0010] According to an embodiment of the present invention, the radius range of the central area of the bottom of the container is 1 / 6 - 2 / 5R, where R is the radius of the bottom of the container. Thereby, the overall performance of the cooking appliance is improved.

[0011] According to an embodiment of the present invention, the first part has at least a first surface and a second surface. The second surface is outside and spaced from the first surface, and the first surface is distributed within 1 / 2 of the radius of the bottom of the container. Thereby, the heat absorption capacity of the middle area at the bottom to external heat and the heat dissipation capacity after heat absorption are improved, thus promoting the boiling effect at the bottom of the container body.

[0012] According to an embodiment of the present invention, the first surface at the bottom of the container extends to the side wall of the container body, and the second surface is located above the first surface. Thereby, the heating effect of the cooking appliance is improved.

[0013] According to an embodiment of the present invention, the first surface at least extends to the arc transition of the container body. Thereby, the heat is higher at the arc transition after being heated, which can improve the heat dissipation at this place, avoid heat concentration, and thus improve the heating uniformity of the cooking appliance.

[0014] According to an embodiment of the present invention, the first surface at the bottom of the container is arranged in a ring shape. Thereby, the heating effect is improved.

[0015] According to an embodiment of the present invention, the first surface has a heating layer.

[0016] According to an embodiment of the present invention, the heating layer includes a weakly magnetic metal material, and the relative magnetic permeability of the weakly magnetic material is less than 1. Thereby, the heating effect of the cooking appliance is improved.

[0017] According to an embodiment of the present invention, the weakly magnetic metal material includes at least one of silver, aluminum, and copper. Thereby, the heating effect of the cooking appliance is improved.

[0018] According to an embodiment of the present invention, the first surface is constituted by the heating layer, and the second surface is constituted by the container body. The heating layer and the second surface satisfy at least one of the following conditions: the surface roughness of the heating layer is greater than the surface roughness of the second surface, and the glossiness of the heating layer is greater than the glossiness of the second surface. Thereby, due to the difference in surface roughness and glossiness between the heating layer and the second surface, when glaze layers are provided on the surface of the heating layer and the second surface, the surface roughness and glossiness of the glaze layer at the first part and the glaze layer at the second part are also different.

[0019] According to an embodiment of the present invention, the arithmetic mean deviation of the profile Ra of the heating layer is 1 - 2, and the maximum height of the profile Rz is 7 - 10. Thereby, the performance of the cooking appliance is improved.

[0020] According to an embodiment of the present invention, a glaze layer is provided on the side of the heating layer away from the container body, and the glaze layer constitutes the first surface and the second surface. The glaze layer has the function of far-infrared emission. When the cooking appliance is heated, heat can be transferred in the cavity in the form of thermal radiation.

[0021] According to an embodiment of the present invention, the surface roughness of the glaze layer at the first surface is greater than the surface roughness of the glaze layer at the second surface. Thereby, due to the different surface roughnesses of the glaze layer, the emission ability of the first part to far-infrared light can be improved, and the absorption ability of the second part to far-infrared light can be improved, enabling the cooking appliance to be heated evenly, and further heating the food materials in the cavity more evenly.

[0022] According to an embodiment of the present invention, the arithmetic mean deviation of the profile Ra of the part of the glaze layer on the side of the heating layer away from the container body is 1 - 2, and the maximum height of the profile Rz is 3 - 7. The heating layer with a larger surface roughness can increase the surface roughness of the glaze layer forming the first surface, thereby improving the emission ability of the far-infrared light wave at this part.

[0023] According to an embodiment of the present invention, at 200 °C, the far-infrared emissivities of the glaze layer at the first surface and the glaze layer at the second surface are independently 0.70 - 0.95. Thereby, the performance of the cooking appliance can be further improved.

[0024] According to an embodiment of the present invention, the ratio of the far-infrared emissivity of the glaze layer at the first part to the far-infrared emissivity of the glaze layer at the second part is greater than 1. Thus, after the heating layer is heated, the generated heat is mainly emitted in the form of far-infrared light waves. Since the ratio of the far-infrared emissivity of the glaze layer at the first part to the far-infrared emissivity of the glaze layer at the second part is greater than 1, the far-infrared light waves are mainly emitted at the first part and mainly absorbed at the second part, so that the cooking appliance is heated evenly.

[0025] According to an embodiment of the present invention, the ratio of the far-infrared emissivity of the glaze layer at the first surface to the far-infrared emissivity of the glaze layer at the second surface is less than 2. Thus, the difference in roughness between the first part and the second part of the cooking appliance is not too large, and the cooking appliance has a better visual effect.

[0026] According to an embodiment of the present invention, the hues of the first surface and the second surface are different, the first surface is a silver surface, and the glossiness of the first surface is greater than the glossiness of the second surface. Thus, the purpose of uniform heating is achieved.

[0027] According to an embodiment of the present invention, the container body is a ceramic matrix. Thus, the performance of the cooking appliance is improved.

[0028] According to an embodiment of the present invention, the arithmetic mean deviation of the profile Ra of the ceramic matrix is 0.5 - 1, and the maximum height of the profile Rz is 3 - 7. Thus, the performance of the cooking appliance is improved.

[0029] In another aspect of the present invention, a method for manufacturing a cooking appliance is provided, including: dividing the inner surface of the container body into a first surface and a second surface, the first surface and the second surface forming a cavity, and making the first surface and the second surface satisfy at least one of the following conditions: the surface roughness of the first surface is greater than the surface roughness of the second surface; the glossiness of the first surface is greater than the glossiness of the second surface. Thus, by adjusting the surface roughness and / or glossiness, the absorption and reflection capabilities of the cooking appliance surface to far-infrared light waves can be adjusted, so that after the first surface is heated, the heat is mainly dissipated, while the second surface mainly absorbs heat, so that the cavity of the cooking appliance is heated evenly, and thus the food to be heated can be heated better.

[0030] According to an embodiment of the present invention, the above method further includes: providing a heating layer on the side of the first surface facing the cavity; forming a glaze layer on the side of the heating layer away from the container body and on the side of the second surface facing the cavity, and making the glaze layer located at the heating layer constitute the first surface, and making the glaze layer located at the part without the heating layer constitute the second surface. The glaze layer has a far-infrared emission function. Thus, after the first part is heated, the heat mainly dissipates on the first surface of the first part, enabling the heat to quickly dissipate and avoiding concentrated heating. The second surface of the second part mainly absorbs energy, enabling the heat to be quickly absorbed, and the overall cooking appliance is evenly heated.

[0031] In another aspect of the present invention, a cooking device is provided, and the cooking device includes the cooking appliance described above. Therefore, the cooking device has all the features and advantages of the cooking appliance described above, which will not be elaborated here. Generally speaking, the cooking device at least has the advantage that the inner liner of the cooking appliance can be evenly heated. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 shows a schematic structural diagram of a ceramic inner liner according to an embodiment of the present invention;

[0034] Figure 2 shows a schematic structural diagram of the ceramic inner liner along the a-a cross-section according to an embodiment of the present invention;

[0035] Figure 3 shows a schematic structural diagram of the ceramic inner liner along the b-b cross-section according to an embodiment of the present invention;

[0036] Figure 4 shows a schematic structural diagram of the ceramic inner liner along the a-a cross-section according to an embodiment of the present invention;

[0037] Figure 5 shows a schematic structural diagram of the ceramic inner liner along the b-b cross-section according to an embodiment of the present invention.

[0038] DESCRIPTION OF REFERENCE NUMERALS:

[0039] 10: the first part; 11: the first surface; 20: the second part; 21: the second surface; 12: the ceramic matrix; 13: the heating layer; 14: the glaze layer; 100: the container body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] Embodiments of the present invention will be described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention. For those not specified in the embodiments, the techniques or conditions described in the literature in the art or according to the product specifications are followed.

[0041] In one aspect of the present invention, a cooking appliance is provided, having a container body. Refer to Figure 1 , the inner surface of the container body 100 is divided into a first surface 11 and a second surface 21. The first surface 11 and the second surface 21 form a cavity. The relationship between the first surface 11 and the second surface 21 satisfies at least one of the following conditions: the surface roughness of the first surface 11 is greater than that of the second surface 21; the glossiness of the first surface 11 is greater than that of the second surface 21. Thus, the first surface 11 has a higher roughness. After the first surface 11 is heated, due to the higher roughness of the first surface 11, the diffuse reflection of far-infrared light waves on the first surface 11 is improved, so that the far-infrared light waves on the first surface 11 diverge in all directions, that is, the heat can diverge in all directions; while the second surface 21 has a lower roughness, and the diffuse reflection of far-infrared light waves on the second surface 21 is weaker, so that the far-infrared light waves are concentrated at the second surface 21, that is, the unheated second surface 21 can concentrate the heat, making the cooking appliance evenly heated. The first surface 11 has a higher glossiness, which can improve the divergence ability of the first surface 11 to far-infrared light waves, making the heat diverge in all directions; the second surface 21 has a lower glossiness, which can improve the absorption ability of the second surface 21 to far-infrared light waves, making the cooking appliance evenly heated.

[0042] It should be specifically noted here that the glossiness can be measured by a glossiness meter. The roughness and glossiness of the first surface 11 and the second surface 21 are measured in the same environment. For example, a glossiness meter with a 60° angle can be used to measure the glossiness.

[0043] According to the embodiments of the present invention, the specific shape, size, and material forming the container body 100 of the cooking appliance are not particularly limited. For example, the container body 100 can be formed of ceramic material. That is to say, the container body 100 can include a ceramic matrix 12. Thus, the excellent properties of ceramic materials such as high temperature resistance, corrosion resistance, being able to ensure the original flavor of food during cooking, and easy cleaning can be utilized. Moreover, ceramics have a good appearance effect, which is also beneficial to making the cooking appliance more beautiful and meeting the new requirements of users for the appearance of kitchen utensils. The cooking appliance can specifically be a pot body, a health kettle, a water kettle, or a stew pot, etc., to meet the various needs of users, so that the cooking appliance can be applied to more types of kitchen appliances, and its specific appearance shape is not particularly limited.

[0044] For the convenience of understanding, the principle by which the cooking appliance can achieve the above beneficial effects will be briefly described below: As mentioned above, due to its high temperature resistance, corrosion resistance, ability to ensure the original flavor of food during cooking, and easy cleaning, ceramic materials are highly trusted by consumers. Products such as ceramic slow cookers and ceramic inner pots have become star products in the market. Currently, most ceramic inner pots are heated from the bottom, and the ceramic sidewalls can only be heated by heat transfer, resulting in slow heating, a large temperature difference between the sidewalls and the bottom, uneven heating of the ceramic inner pot, a long cooking time, and poor taste of the cooked food. The uneven heating of the ceramic inner pot not only affects the heating efficiency but also, when cooking with this ceramic inner pot, only the bottom of the container is heated, which also affects the taste and flavor of the cooked food.

[0045] The cooking appliance proposed by the present invention can alleviate or even solve the above problems to a certain extent. The inventor found that the surface roughness and glossiness of the cooking appliance are closely related to the emission and absorption behaviors of infrared waves, especially in the far-infrared band. Specifically, when the surface roughness of a certain surface is different, it has different optical behaviors for far-infrared waves. For example, a relatively rough surface, that is, a surface with a large surface roughness, has a strong diffuse reflection effect on far-infrared light waves. That is, when far-infrared waves act on the rough surface, they tend to diverge in all directions. Therefore, a rough surface is conducive to heat dissipation. When the surface roughness of a certain surface is low, the diffuse reflection effect of this surface on far-infrared waves is weak, and the far-infrared light waves are concentrated on the surface with low surface roughness. Therefore, a smoother surface is conducive to heat absorption. When the glossiness of a certain surface is different, it also has different optical behaviors for far-infrared waves. For example, a surface with a large glossiness has a strong emission effect on far-infrared light waves, that is, the far-infrared light waves can be emitted into the environment through this surface, which means that heat can be dissipated more quickly; a surface with a relatively small glossiness has a strong absorption effect on far-infrared light waves. That is, when far-infrared waves act on the surface with a small glossiness, the far-infrared waves are preferentially absorbed, thereby increasing the temperature of the container body corresponding to the position with a small glossiness to achieve more uniform heating. In the present invention, specifically, the inner surface of the container body 100 is divided into a first surface 11 and a second surface 21. The first surface 11 and the second surface 21 form a cavity. The surface roughness of the first surface 11 is greater than that of the second surface 21. Thus, when the first surface 11 is heated, the temperature rises rapidly, and a large part of the generated heat is emitted in the form of thermal radiation, mainly in the far-infrared band. Due to the relatively large surface roughness and / or glossiness of the first surface 11, the emission ability of the first surface 11 for far-infrared light waves can be improved, that is, heat is mainly emitted from the first surface 11; the surface roughness and / or glossiness of the second surface 21 is relatively small, which can improve the absorption ability of the second surface 21 for far-infrared light waves, that is, the second surface 21 mainly absorbs heat, so that the cavity of the cooking appliance is uniformly heated, and then the food to be heated can be heated better.Thus, when the first surface 11 of the container body 100 is heated, the first surface 11, which has a relatively large roughness and gloss, mainly dissipates heat, thereby preventing the first part 10 from being concentratedly heated. The second surface 21, which has a relatively small roughness and gloss, mainly absorbs heat, enabling the cooking appliance to be evenly heated. Moreover, the first surface 11 has a relatively large roughness and can quickly absorb the heat from the outside, rapidly increasing the temperature to generate heat radiation. At this time, since the first surface 11, which has a relatively large roughness and gloss, has a strong ability to emit heat, it can quickly dissipate the heat, preventing the first surface 11 from being concentratedly heated. The second surface 21 has a relatively small roughness. Although it heats up more slowly when heated, since the second surface 21, which has a relatively small roughness and gloss, can absorb the heat of the heat radiation dissipated by the first surface 11, the cooking appliance can be evenly heated.

[0046] According to an embodiment of the present invention, the first surface 11 and the second surface 21 are spaced apart. Thus, it can not only reduce the diffuse reflection concentrated in a certain area and promote the uniform dissipation of heat, but also promote the concentration of heat inside the cooking appliance, improve the heat utilization rate, and further enhance the heat circulation between the first surface 11 and the second surface 21, improving the boiling effect.

[0047] According to some embodiments of the present invention, the shapes of the first surface 11 and the second surface 21 are not particularly limited, and those skilled in the art can freely select according to needs. For example, the first surface 11 and / or the second surface 21 at the bottom of the container can be annularly arranged. Thus, the heating effect is improved.

[0048] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 , the container body 100 is divided into a first part 10 and a second part 20. A heating layer 13 can be provided in the first part 10, and the heating layer 13 constitutes the first surface 11 of the first part 10. Specifically, the heating layer 13 includes a weakly magnetic metal material. Thus, by providing the heating layer 13 in the first part 10, the cooking appliance can be heated by electromagnetic heating technology. Since the materials of the first surface 11 and the second surface 21 are different, the roughness and / or gloss of the two parts are different.

[0049] According to some embodiments of the present invention, referring to Figure 2 , the first surface 11 can be constituted by the heating layer 13, and the second surface 21 can be constituted by the container body 100. When the container body 100 is a ceramic matrix 12, the second surface 21 is constituted by the ceramic matrix 12 (referring to Figure 3)。According to some embodiments of the present invention, the first part 10 of the container body has at least a first surface 11 and a second surface 21. The first surface 11 is outside the second surface 21 and is spaced apart. When the first surface 11 has a heating layer 13, the second surface 21 is a ceramic matrix 12, and the second surface 21 is provided in the central area of the bottom of the container. Thus, it is possible to avoid heat concentration at the bottom due to too fast temperature rise, improve the temperature uniformity of the container body 100, enhance the heat absorption capacity of the middle area at the bottom for the outside world and the heat dissipation capacity for heat, thereby promoting the boiling effect at the bottom. According to some embodiments of the present invention, the radius range of the central area at the bottom of the container is (1 / 6 - 2 / 5)R, where R is the radius of the bottom of the container. According to some other specific embodiments of the present invention, the heating layer 13 and the ceramic matrix 12 can satisfy at least one of the following conditions: the surface roughness of the heating layer 13 is greater than the surface roughness of the ceramic matrix 12, and the glossiness of the heating layer 13 is greater than the glossiness of the ceramic matrix 12. Specifically, the arithmetic mean deviation of the profile Ra of the heating layer 13 is 1 - 2. For example, it can be 1.2, 1.4, 1.6, 1.8, etc., and the maximum height of the profile Rz is 7 - 10. For example, it can be 7.5, 8.0, 8.5, 9.0, 9.5, etc.; the arithmetic mean deviation of the profile Ra of the ceramic matrix 12 is 0.5 - 1. For example, it can be 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, etc., and the maximum height of the profile Rz is 3 - 7. For example, it can be 4, 5, 6, etc. It should be specifically noted here that since the roughness and glossiness of both the first surface 11 and the second surface 21 are related to the morphology of the inner surface of the container body 100, if the roughness of the container body 100 is too large, although it can improve the absorption capacity for far-infrared light waves, it also increases the diffuse reflection of the container body 100 for far-infrared light waves, resulting in heat loss. Therefore, the roughness of the container body 100 needs to be controlled within a certain range. Thus, the difference in the surface roughness and glossiness of the first surface 11 and the second surface 21 can be utilized to improve the emission capacity of the first surface 11 for far-infrared light waves and the absorption capacity of the second surface 21 for far-infrared light waves, so that the first surface 11 mainly dissipates heat and the second surface 21 mainly absorbs heat, achieving the purpose of uniform heating.

[0050] According to some embodiments of the present invention, the first surface 11 has a heating layer 13, and the heating layer 13 is disposed on the surface of the container body. The surface of the heating layer 13 away from the container body 100 at least constitutes a part of the first surface 11 (not shown in the figure). That is to say, the first surface 11 may be entirely composed of the heating layer 13, or the heating layer 13 may only account for a part of the first surface 11. Thus, the cooking appliance can be heated through the first part 10. It should be particularly noted here that the specific formation method of the heating layer 13 is not particularly limited, and those skilled in the art can select and set according to the actual situation. In some specific embodiments of the present invention, the heating layer 13 can be formed by pasting a metal film layer, can be formed by a water transfer printing method, and can also be formed by a thermal spraying method. The specific conditions of thermal spraying in the present invention are not limited, as long as a uniform and flat film layer can be formed.

[0051] Since the first part 10 can be entirely provided with the heating layer 13, it can, to a certain extent, avoid the cracking and other phenomena between different layers caused by heat during the use of the cooking appliance due to a large number of bottom layers, thereby improving the service life of the cooking appliance. It can also, to a certain extent, avoid the phenomenon of the bottom of the container being cracked due to collision during use.

[0052] According to some embodiments of the present invention, the heating layer 13 includes a weakly magnetic metal material. It should be particularly noted here that the weakly magnetic metal material refers to a metal material with a relative magnetic permeability less than 1. According to some embodiments of the present invention, the type of the weakly magnetic metal material is not particularly limited, and those skilled in the art can select according to needs. For example, it can be silver, aluminum, copper, etc. According to some embodiments of the present invention, the heating layer 13 can be a silver film. For example, a silver paste can be coated on the first part 10 of the cooking appliance to form the heating layer 13, and the thickness and shape of the silver film are not particularly limited, and those skilled in the art can design according to needs. According to some other embodiments of the present invention, the heating layer 13 may further include an inorganic non-metallic material, and the inorganic non-metallic material includes at least one of silicon oxide, bismuth oxide, magnesium oxide, and potassium oxide. The content of the inorganic non-metallic material in the heating layer 13 is 10 - 30% (mass percentage), and the content of the weakly magnetic metal material is 60 - 90% (mass percentage). Thus, it is beneficial to further improve the overall performance of the heating layer 13.

[0053] According to some embodiments of the present invention, in order to improve the smoothness of the inner surface of the cooking appliance for the convenience of cooking and cleaning, the inner surface of the container body 100 may further have a glaze layer. Refer to Figure 4 , the glaze layer 14 of the first part can be located on the side of the heating layer 13 away from the ceramic substrate 12. Refer to Figure 5, the glaze layer 14 of the second part is located on the side of the ceramic substrate 12 facing the cavity. At this time, the surface of the glaze layer 14 constitutes the first surface and the second surface.

[0054] According to some specific embodiments of the present invention, the first part has a first surface and a second surface, the second surface is disposed outside the first surface, and the first surface is at least distributed within 1 / 2 of the radius of the bottom of the container. Setting the first surface to be at least distributed within 1 / 2 of the radius of the bottom of the container improves the absorption ability of the first surface to external energy and increases the dissipation of heat. And the first part having the first surface and the second surface reduces the concentration of temperature caused by the too-fast temperature rise at the bottom. By providing the first surface and the second surface at the bottom, with the second surface disposed outside the first surface, the temperature rise rate is reduced and the uniformity of the temperature of the container body is improved. When the container body has a glaze layer 14, the first surface may be composed of a heating layer, and the second surface may be composed of the glaze layer 14. The second surface is disposed outside the first surface, and the first surface is at least distributed within 1 / 2 of the radius of the bottom of the container. Thus, the glaze layer 14 can protect the heating layer to a certain extent and prevent the heating layer from falling off due to corrosion by water vapor during the heating process. According to some embodiments of the present invention, the first surface at the bottom of the container extends to the side wall of the container body, and the second surface is above the first surface. According to some specific embodiments of the present invention, the first surface at least extends to the arc transition of the container. Thus, the heat is higher at the arc transition after being heated, which can improve the dissipation of heat at this place, avoid heat concentration, and thus improve the uniformity of the heating of the cooking appliance.

[0055] According to some other embodiments of the present invention, the surface of the glaze layer 14 at the first surface and the surface of the glaze layer 14 at the second surface satisfy at least one of the following conditions: the surface roughness of the glaze layer 14 at the first surface is greater than the surface roughness of the glaze layer 14 at the second surface, and the glossiness of the glaze layer 14 at the first surface is greater than the glossiness of the glaze layer 14 at the second surface. It should be particularly noted here that since the surface roughness of the heating layer 13 at the first surface is greater than the surface roughness of the ceramic substrate 12 at the second surface, and the glossiness of the glaze layer 14 at the first surface is greater than the glossiness of the glaze layer 14 at the second surface, and the glaze layer 14 at the first surface is provided on the side of the heating layer 13 away from the ceramic substrate 12, and the glaze layer 14 at the second surface is provided on the side of the ceramic substrate 12 facing the cavity. The arithmetic mean deviation Ra of the profile of the heating layer 13 is designed to be 1-2, and the maximum profile height Rz is 7-10. The arithmetic mean deviation Ra of the profile of the glaze layer 14 at the first surface is 1-2, and the maximum profile height Rz is 7-10. The arithmetic mean deviation Ra of the profile of the ceramic substrate 12 is 0.5-1, and the maximum profile height Rz is 3-7. The arithmetic mean deviation Ra of the profile of the glaze layer 14 at the second surface is 0.5-1, and the maximum profile height Rz is 3-7. Thus, when the surface roughness and / or glossiness of the glaze layer 14 at the first surface and the second surface meet the foregoing requirements, the difference in the surface roughness and / or glossiness of the first surface and the second surface can be utilized to improve the emission ability of the first surface to far-infrared light waves and the absorption ability of the second surface to far-infrared light waves, so that the first surface mainly dissipates heat and the second surface mainly absorbs heat, achieving the purpose of uniform heating.

[0056] It should be particularly noted here that Ra and Rz are different representations of surface roughness. Among them, Ra is the arithmetic mean deviation of the profile, that is, the arithmetic mean of the absolute values of the profile offsets within the sampling length; Rz is the maximum profile height (average value), that is, the average value of the single profile height between the maximum peak height and the maximum valley depth obtained within the sampling length.

[0057] According to some embodiments of the present invention, the glaze layer 14 in the first part 10 and the second part 20 can be formed of the same glaze. Therefore, the glaze layer covering the inner surface of the entire container body 100 can be formed by a single glazing operation, and at the same time, inner surfaces with two different surface roughnesses can be obtained. This method has a simple process, unified glaze, cost savings, is not easy to crack at the junction of the two glazes, is easy to clean, and extends the service life.

[0058] Alternatively, according to some other embodiments of the present invention, the glaze layers 14 of the first part 10 and the second part 20 may be inconsistent. Since the materials of the first part 10 and the second part 20 are different, in addition to the substrate, the first part 10 further has a heating layer 13. Besides adjusting the heating layer 13 and the substrate to make the surface roughness and / or glossiness of the first surface 11 and the second surface 21 different, the composition of the glaze layer can also be adjusted to make the surface roughness and / or glossiness of the first surface 11 and the second surface 21 different, so as to achieve the purpose that the first surface 11 emits far-infrared light waves and the second surface 21 absorbs far-infrared light waves, and further realize uniform heating of water or food in the cooking appliance.

[0059] Those skilled in the art can understand that when the inner side of the container body 100 has a glaze layer 14, the surface roughness and the far-infrared emissivity inside the container body 100 are both determined by the surface of the glaze layer 14 facing the inner side of the container body 100. Therefore, by adjusting the material, thickness of the glaze layer 14, and the surface topography of the structure (such as the ceramic substrate 12 and the heating layer as described above) below the glaze layer 14, the surface roughness and / or glossiness of the first surface 11 and the second surface 21 inside the container body 100 can be controlled to improve the emission or absorption ability of the first surface 11 and the second surface 21 to far-infrared light waves. Therefore, the specific material and thickness of the glaze layer 14 proposed by the present invention are not particularly limited as long as it can be realized that the surface roughness of the first surface 11 is greater than that of the second surface 21, and / or the glossiness of the first surface 11 is greater than that of the second surface 21.

[0060] According to some embodiments of the present invention, the difference in glossiness between the first surface 11 and the second surface 21 can be achieved by setting different hues on the first surface 11 and the second surface 21. Specifically, the first surface 11 can be set as a silver surface, which can be specifically achieved by including but not limited to setting a heating layer at the first surface 11. Thus, the glossiness of the first surface 11 and the second surface 21 can meet the aforementioned requirements, so as to achieve the effect of improving the heat dissipation at the first surface 11 and at the same time improving the heat preservation at the second surface 21.

[0061] For example, according to some embodiments of the present invention, at 200 °C, the far-infrared emissivity of the glaze layer at the first surface 11 and the second surface 21 is independently 0.70 to 0.95. As described above, since there is a heating layer 13 at the first surface 11, the surface roughness and / or glossiness of the first surface 11 without the glaze layer 14 and the second surface 21 without the glaze layer 14 are different. According to some embodiments of the present invention, a continuous glaze layer is provided on the inner surface of the container body, and it is also possible to make the surface roughness of the glaze layer 14 located on the first surface 11 greater than the surface roughness of the glaze layer 14 located on the second surface 21, or the glossiness of the glaze layer 14 on the first surface 11 greater than the glossiness of the glaze layer 14 on the second surface 21, or make the glaze layer 14 located on the first surface 11 and the glaze layer 14 located on the second surface 21 simultaneously meet the aforementioned roughness and glossiness requirements. Thus, by the difference in surface roughness and glossiness, the emission ability of the glaze layer 14 on the first surface 11 to far-infrared light waves is improved, which is conducive to the dissipation of heat. At the same time, the absorption ability of the glaze layer 14 on the second surface 21 to far-infrared light waves is improved, thereby accelerating the absorption of heat and achieving the purpose of overall uniform heating. Specifically, according to some embodiments of the present invention, the ratio of the far-infrared emissivity of the glaze layer 14 located on the first surface 11 to the far-infrared emissivity of the glaze layer 14 located on the second surface 21 is greater than 1, that is, the emissivity of the glaze layer 14 on the first surface 11 to far-infrared light waves is greater than the emissivity of the glaze layer 14 on the second surface 21 to far-infrared light waves. Specifically, the range of the far-infrared emissivity of the glaze layer 14 at the first surface 11 can be between (0.8 - 0.95), and the range of the far-infrared emissivity of the glaze layer 14 at the second surface 21 can be between (0.7 - 0.8). Thus, after the heating layer on the first surface 11 is heated, the heat can be quickly dissipated. According to some embodiments of the present invention, the ratio of the far-infrared emissivity of the glaze layer 14 located on the first surface 11 to the far-infrared emissivity of the glaze layer 14 located on the second surface 21 is less than 2. Thereby, the uniformity of the container temperature is improved.

[0062] According to some embodiments of the present invention, the first part 10 of the cooking appliance is at least located at the bottom of the container body, and the second part 20 is located above the first part 10 (not shown in the figure). Thus, after the first part 10 of the container body 100 is heated, the temperature of the first part 10 rises rapidly. The second part 20 is located above the first part 10, and the heat of the first part 10 diverges upward inside the container body 100. The second part 20 can absorb more of this part of the energy, thereby improving the heat absorption capacity of the second part 20. At the same time, since the surface roughness of the first surface 11 is greater than that of the second surface 21, after the first part 10 is heated, the diffuse reflection of the far-infrared light wave in the first part 10 is improved, so that the far-infrared light wave of the first part 10 diverges in all directions, that is, the heat can diverge in all directions; while the roughness of the second part 20 is lower, and the diffuse reflection of the far-infrared light wave in the second part 20 is weaker, so that the far-infrared light wave is concentrated at the second part 20, that is, the unheated second part 20 can concentrate the heat, making the cooking appliance heated evenly. According to some embodiments of the present invention, the glossiness of the first surface 11 is greater than that of the second surface 21. Thus, the divergence ability of the first surface 11 to the far-infrared light wave can be improved, that is, the heat can diverge in all directions; the glossiness of the second surface 21 is lower, which can improve the absorption ability of the far-infrared light wave, making the cooking appliance heated evenly.

[0063] According to some other embodiments of the present invention, the first part 10 further includes a part of the side wall of the container body 100 near the bottom. Specifically, the height of the part of the side wall near the bottom can be no more than half of the height of the side wall. Thus, heating can be carried out in a relatively large range, and the first part 10 can more effectively diffuse the heat generated by heating in the form of far-infrared light waves, which is then absorbed by the second part 20, improving the heating efficiency of the cooking appliance for food and shortening the cooking time to meet the needs of consumers.

[0064] On the other hand of the present invention, a method for manufacturing a cooking appliance is provided. The method includes: providing a container body 100, the inner surface of the container body 100 is divided into a first surface 11 and a second surface 21, the first surface 11 and the second surface 21 form a cavity, and the first surface 11 and the second surface 21 satisfy at least one of the following conditions: the surface roughness of the first surface 11 is greater than that of the second surface 21; the glossiness of the first surface 11 is greater than that of the second surface 21. Thus, by adjusting the surface roughness and / or glossiness, the absorption and reflection abilities of the surface of the cooking appliance to the far-infrared light wave can be adjusted, so that after the first surface 11 is heated, the heat mainly diverges, while the second surface 21 mainly absorbs the heat, so that the cavity of the cooking appliance is heated evenly, and then the food to be heated can be heated better.

[0065] According to some embodiments of the present invention, the glossiness of the first surface 11 is different from that of the second surface 21, which can be achieved by setting different hues on the first surface 11 and the second surface 21. Specifically, the first surface 11 may be a silver surface.

[0066] According to some embodiments of the present invention, the method may further include: providing a heating layer 13 on the side of the first surface 11 facing the cavity, forming an enamel layer 14 on the side of the heating layer 13 away from the container body 100 and on the side of the second surface 21 facing the cavity, and making the enamel layer 14 at the heating layer 12 constitute the first surface 11, and making the enamel layer 14 at the position without the heating layer 13 constitute the second surface 21. Thus, since the enamel layer 14 has a far-infrared emission function, and far-infrared light waves are mainly reflected on a smooth enamel surface and mainly absorbed on a rough enamel surface. When the first surface 11 is heated, the heat mainly diverges on the first surface 11, so that the heat can be quickly dissipated, avoiding concentrated heat generation at the bottom. The second surface 21 mainly absorbs heat, enabling the heat to be quickly absorbed, and making the cooking appliance heated evenly as a whole.

[0067] In another aspect of the present invention, a cooking device is provided, and the cooking device includes the cooking appliance described above. Thus, the cooking device containing the above cooking appliance can satisfy the visual enjoyment of consumers because the base material can be a material such as ceramics that is popular among consumers, and at the same time, it can also meet the requirements of consumers for the cooked food because it can evenly heat the food in the cooking appliance.

[0068] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0069] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "example", "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 invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0070] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A cooking appliance, characterized in that, It has a container body, the inner surface of the container body is divided into a first surface and a second surface, the first surface and the second surface form a cavity, and the relationship between the first surface and the second surface satisfies at least one of the following conditions: The surface roughness of the first surface is greater than that of the second surface; The glossiness of the first surface is greater than that of the second surface; A heating layer is provided on the side of the first surface facing the cavity; An enamel layer is formed on the side of the heating layer away from the container body and on the side of the second surface facing the cavity; The surface roughness of the enamel layer at the first surface is greater than that of the enamel layer at the second surface.

2. The cooking appliance according to claim 1, wherein, The first surface and the second surface are arranged at intervals.

3. The cooking appliance according to claim 1, characterized in that, The container body is divided into a first part and a second part, the first part is at least located at the bottom of the container body, and the second part is above the first part.

4. The cooking appliance according to claim 3, characterized in that, The first part further includes a part of the side wall of the container body near the bottom.

5. The cooking appliance according to claim 3, characterized in that, The first part has the first surface and the second surface, the first surface is outside and spaced from the second surface, and the second surface is arranged in the central area of the container bottom.

6. The cooking appliance according to claim 5, wherein, The radius range of the central area of the container bottom is (1 / 6 - 2 / 5)R, where R is the radius of the container bottom.

7. The cooking appliance according to claim 3, characterized in that, The first part has at least the first surface and the second surface, the second surface is outside and spaced from the first surface, and the first surface is at least distributed within 1 / 2 of the radius of the container bottom.

8. The cooking appliance according to claim 7, characterized in that, The first surface at the container bottom extends to the side wall of the container body, and the second surface is above the first surface.

9. The cooking appliance according to claim 8, characterized in that, The first surface at least extends to the arc transition of the container body.

10. The cooking appliance according to claim 8, wherein, The first surface at the container bottom is arranged in a ring shape.

11. The cooking appliance according to claim 1, characterized in that, The heating layer includes a weakly magnetic metal material, and the relative magnetic permeability of the weakly magnetic metal material is less than 1.

12. The cooking appliance according to claim 11, characterized in that, The weakly magnetic metal material includes at least one of silver, aluminum, and copper.

13. The cooking appliance according to claim 1, characterized in that, The glossiness of the enamel layer at the first surface is greater than that of the enamel layer at the second surface.

14. The cooking appliance according to claim 13, characterized in that, The arithmetic mean deviation of the profile Ra of the heating layer is 1 - 2, and the maximum height of the profile Rz is 7 - 10.

15. The cooking appliance according to claim 1, characterized in that, The arithmetic mean deviation of the profile Ra of the part of the enamel layer on the side of the heating layer away from the container body is 1 - 2, and the maximum height of the profile Rz is 3 - 7.

16. The cooking appliance according to claim 1, wherein The arithmetic mean deviation of the profile Ra of the enamel layer at the first surface is 1 - 2, and the maximum height of the profile Rz is 7 - 10.

17. The cooking appliance according to claim 1, characterized in that At 200 °C, the far-infrared emissivities of the enamel layer at the first surface and the enamel layer at the second surface are independently 0.70 - 0.

95.

18. The cooking appliance according to claim 1, characterized in that, The ratio of the far-infrared emissivity of the enamel layer at the first surface to the far-infrared emissivity of the enamel layer at the second surface is greater than 1.

19. The cooking appliance according to claim 1, characterized in that, The ratio of the far-infrared emissivity of the enamel layer at the first surface to the far-infrared emissivity of the enamel layer at the second surface is less than 2.

20. The cooking appliance according to claim 1, wherein The first surface has a different hue from the second surface. The first surface is a silver surface, and the glossiness of the first surface is greater than that of the second surface.

21. The cooking appliance according to any one of claims 1-20, characterized in that, The container body is a ceramic matrix.

22. The cooking appliance according to claim 21, wherein, The arithmetic mean deviation of the profile Ra of the ceramic matrix is 0.5 - 1, and the maximum height of the profile Rz is 3 - 7.

23. A method for manufacturing a cooking appliance, characterized in that, Comprising: Providing a container body, the inner surface of the container body is divided into a first surface and a second surface, and the first surface and the second surface form a cavity. And making the first surface and the second surface satisfy at least one of the following conditions: The surface roughness of the first surface is greater than that of the second surface; The glossiness of the first surface is greater than that of the second surface; A heating layer is provided on the side of the first surface facing the cavity; A glaze layer is formed on the side of the heating layer away from the container body and on the side of the second surface facing the cavity. And making the glaze layer at the heating layer constitute the first surface, and making the glaze layer at the position without the heating layer constitute the second surface.

24. A cooking device, characterized in that, The cooking device includes the cooking utensil according to any one of claims 1 to 22, or includes the cooking utensil obtained by the method described in claim 23.

Images