Non-stick inner container and cooking utensil

Abstract

The inner container is provided with an inner surface, the inner surface comprises a non-stick face and a sealing face, the non-stick face at least covers the bottom area of the inner container, the sealing face at least covers the opening edge of the inner container, the non-stick face comprises a concave-convex structure comprising a plurality of concave parts and convex parts, and the concave-convex structure comprises a plurality of convex parts and a plurality of concave parts. The roughness of the sealing surface is smaller than that of the non-stick surface, and the surface of at least part of the concave part and / or part of the convex part is provided with a physical vapor deposition layer. The non-stick inner container and the cooking utensil have good non-stick performance.

Description

Technical Field

[0001] The present application relates to the technical field of cooking appliances, and particularly to a non-stick inner pot and a cooking appliance. Background Art

[0002] To achieve non-stick performance in existing cooking appliances, a chemical coating, generally polytetrafluoroethylene, is applied to the surface of the cooking appliance. The polytetrafluoroethylene coating is non-toxic under normal conditions, but it will start to volatilize when the heating temperature of the coating reaches 260°C, and the polytetrafluoroethylene coating will start to decompose when the temperature reaches 350°C. Therefore, the operating temperature of a non-stick pan with a polytetrafluoroethylene coating generally cannot exceed 250°C. However, for general cooking appliances such as a wok, the heating temperature often exceeds 260°C, so there are safety hazards. In addition, the coating is not wear-resistant and there is a risk of peeling off, which is likely to be accidentally ingested with food and affect physical health.

[0003] Currently, there is a wok with a honeycomb structure. Stainless steel is used as the base material, evenly distributed grooves are processed on the surface of the base material, a layer of polytetrafluoroethylene is sprayed on the entire surface of the base material, and finally, the polytetrafluoroethylene on the surface of the base material between the grooves is polished away by polishing, and only the polytetrafluoroethylene in the grooves is retained to achieve the non-stick performance of the pan surface. The advantages of this technology are that the stainless steel material has good strength and is resistant to scraping by a spatula, and a certain degree of non-stickiness can be achieved in oil cooking. The disadvantages are that polytetrafluoroethylene has risks of decomposition and peeling off, there are safety hazards, and when cooking rice-like foods, the non-stickiness of this structure is not good. Summary of the Utility Model

[0004] To solve the above technical problems, the present application provides a non-stick inner pot and a cooking appliance, which can not only improve the non-stick performance of the inner pot surface but also have the advantages of wear resistance and not being easily peeled off.

[0005] In a first aspect, the present application provides a non-stick inner pot. The inner pot has an inner surface, and the inner surface includes a non-stick surface and a sealing surface. The non-stick surface covers at least the bottom area of the inner pot, and the sealing surface covers at least the rim of the inner pot. The non-stick surface includes a concavo-convex structure with a plurality of concave portions and convex portions. The roughness of the sealing surface is less than that of the non-stick surface, and a physical vapor deposition layer is provided on at least part of the surface of the concave portions and / or part of the convex portions.

[0006] By adopting the above technical solution, the concavo-convex structure can form a hydrophobic structure on the surface of the inner pot base material, but this hydrophobic structure is not wear-resistant. A physical vapor deposition layer is plated on the surface of the concavo-convex structure, and the physical vapor deposition layer has the characteristic of wear resistance, so that the wear-resistant and non-stick performance of the inner pot surface can be achieved.

[0007] This technical solution is provided with a non-stick surface in the bottom area of the inner container. The non-stick surface has concave parts and convex parts, which can endow the bottom of the inner container with non-stick performance. And the surface roughness of the sealing surface is less than that of the non-stick surface, which can not only improve the non-stick performance between the bottom of the inner container and cooking ingredients, but also enhance the sealing performance at the mouth edge of the inner container. This technical solution can be used for the inner container for cooking rice, reducing the adhesiveness between the rice and the inner container, facilitating the cleaning of the inner container and reducing the waste of rice.

[0008] In combination with the first aspect, in a further solution, the convex part is in a hilly shape surrounding the concave part, and the surface roughness of the concave part is less than that of the convex part.

[0009] By adopting the above technical solution, an uneven structure with multiple concave parts and convex parts can be directly processed on the surface of the inner container base material through shot peening or rolling, etc. The integral structure has higher strength, and the falling-off risk brought by the two-piece structure can be reduced. The surface roughness of the concave part is less than that of the convex part, and the convex part is in a hilly shape surrounding the concave part, which can improve the bonding performance with the physical vapor deposition layer and has good surface strength.

[0010] In combination with the first aspect, in a further solution, at least part of the concave part and / or at least part of the convex part surface has multiple spherical pits, there are hilly protrusions between the pits, and the surface roughness of the pits is less than that of the protrusions.

[0011] By adopting the above technical solution, multiple spherical pits are provided on the surfaces of the concave part and the convex part, and hilly protrusions are provided between the pits, which can form a multi-level uneven structure on the metal surface and can form better non-stick performance. The surface roughness of the pits is less than that of the protrusions, which can improve the bonding performance with the physical vapor deposition layer and has good surface strength.

[0012] In combination with the first aspect, in a further solution, the concave part and the convex part are of an integral structure with the inner container base material, and the physical vapor deposition layer is in direct contact with at least part of the concave part and / or part of the convex part surface.

[0013] By adopting the above technical solution, an uneven structure with multiple concave parts and convex parts is directly processed on the surface of the inner container base material through impact or rolling, etc. The integral structure has higher strength, and the falling-off risk brought by the two-piece structure can be reduced. The physical vapor deposition layer is in direct contact with the uneven structure without an intermediate layer, which can reduce the processing procedures, lower the processing cost, has good bonding performance and can also achieve wear-resistant and non-stick performance.

[0014] In combination with the first aspect, in a further embodiment, at least a part of the concave portion and / or at least a part of the convex portion surface is provided with an electrolytic layer or a plasma polishing layer, and the electrolytic layer or the plasma polishing layer is in direct contact with the physical vapor deposition layer.

[0015] Through experimental tests, it is found that under the action of electrolysis, micro- and nano-scale V-shaped, C-shaped, U-shaped or randomly sized concave bodies can be formed on the inner surface structure of the cookware, which can further reduce the contact area between the food ingredients and the cookware body. Coupled with the repulsive force formed by the expansion and flow of the air in the concave bodies when heated, the non-stick effect can be well achieved. In addition, electrolysis can also form an oxide film on the surface of the shot-peened layer, thereby changing its color and improving its performance, enhancing the performance and grade of the product. Plasma polishing can further process micro- or nano-scale concave and convex structures on the surface of the shot-peened layer, further enhancing the hydrophobic performance and the non-stick performance of the product surface. Plasma polishing can also improve the brightness of the product surface and enhance the quality of the product.

[0016] In combination with the first aspect, in a further embodiment, the side wall of the inner liner is arc-shaped, and the junction of the non-stick surface and the sealing surface is located at the maximum latitudinal circle radius of the side wall or between the maximum latitudinal circle radius and the mouth edge.

[0017] By adopting the above technical solution, a spherical inner liner with an arc-shaped side wall cooks more evenly. When the junction of the non-stick surface and the sealing surface of the spherical inner liner is located at the maximum latitudinal circle radius of the side wall or between the maximum latitudinal circle radius and the mouth edge, the non-stick performance of the part in contact with the rice can be achieved, and the sealing performance of the mouth of the inner liner can also be achieved.

[0018] In combination with the first aspect, in a further embodiment, the concave portion is a spherical concave pit, the spherical diameter of the concave pit is 0.2 - 0.95 mm; the range of the center distance between the holes of the concave pit is 0.3 - 0.8 mm.

[0019] By adopting the above technical solution, the concave portion is a spherical concave pit and there are hilly protrusions between the concave pits, which can form a characteristic concave and convex structure on the metal surface and can form better non-stick performance. The processing technology of physical vapor deposition (PVD) is applied to the concave and convex structure of the concave pit with a spherical diameter of 0.2 - 0.95 mm, preferably 0.4 - 0.65 mm, and the range of the center distance between the holes of the concave pit is 0.3 - 0.8 mm, preferably 0.6 mm, which has better non-stick performance and wear resistance.

[0020] In combination with the first aspect, in a further embodiment, the spherical diameter of the concave pit is 0.2 - 0.95 mm; the range of the center distance between the holes of the concave pit is 0.3 - 0.8 mm.

[0021] By adopting the above technical solution, the non-stick inner liner has better bonding performance and non-stick performance.

[0022] In a second aspect, the present application provides a cooking appliance, including the non-stick inner pot described in the first aspect.

[0023] By adopting the above technical solution, the cooking appliance with a non-stick inner pot can improve the non-stick performance when cooking food, reduce the probability of food sticking to the surface of the body, be more convenient for cleaning the cooking appliance, and enhance the cooking pleasure.

[0024] In combination with the second aspect, in a further embodiment, it further includes a seal, which is in contact sealing connection with the sealing surface in the working state.

[0025] By adopting the above technical solution, the cooking appliance has both non-stick performance and good sealing performance. When cooking food, it can improve the sealing performance to enhance the cooking quality, reduce the probability of food sticking to the surface of the inner pot, be convenient for cleaning the cooking appliance, and enhance the cooking pleasure.

[0026] In summary, the present application has at least one of the following beneficial technical effects:

[0027] 1. The non-stick inner pot of the present application endows the metal surface with both wear resistance and physical non-stick properties, especially when applied to rice cooking, it has good non-stick performance.

[0028] 2. The non-stick inner pot of the present application can reduce the risk of detachment caused by the two-body structure and has higher strength.

[0029] 3. The non-stick inner pot of the present application has the physical vapor deposition layer directly contacting the concave-convex structure without an intermediate transition layer, which can not only ensure the bonding strength but also reduce the processing procedures and processing costs.

[0030] 4. The cooking appliance of the present application can meet the wear resistance and non-stick performance required during normal cooking of the cooking appliance, and can also improve the sealed cooking performance of the cooking appliance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural view of the spherical non-stick inner pot of the present application;

[0032] Figure 2 is a schematic structural view of the spherical non-stick inner pot from another angle of the present application;

[0033] Figure 3 is a schematic front view structural view of the spherical non-stick inner pot of the present application;

[0034] Figure 4 is a schematic structural view of the straight cylindrical non-stick inner pot of the present application;

[0035] Figure 5 is Figure 4 the enlarged schematic view at A in

[0036] Figure 6 is Figure 5 Schematic diagram of the partial B-B cross-section in it;

[0037] Figure 7 is Figure 6 Schematic diagram of the concave-convex structure after removing the physical vapor deposition layer;

[0038] Figure 8 Schematic diagram of the sectional structure of the second embodiment of the non-stick inner liner of the present application;

[0039] Figure 9 is Figure 8 Enlarged schematic diagram at C in it;

[0040] Figure 10 Schematic diagram of the concave-convex structure after removing the physical vapor deposition layer of the third embodiment of the non-stick inner liner of the present application;

[0041] Figure 11 is Figure 10 Enlarged schematic diagram at D in it.

[0042] Reference numerals:

[0043] 100, inner liner; 1, inner surface; 10, bottom area; 11, rim; 12, non-stick surface; 121, concave-convex structure; 1211, concave part; 1212, convex part; 122, physical vapor deposition layer; 123, pit; 124, protrusion; 13, sealing surface; 2, side wall; 3, maximum latitude circle radius; a, hole center distance; b, concave-convex height difference; c, concave part depth. Detailed implementation manners

[0044] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. Components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0045] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0046] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0047] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0048] The existing chemical non-stick structure includes grooves, which are processed to a certain depth on the surface of a metal substrate by chemical etching. The chemical non-stick products of the prior art spray a layer of polytetrafluoroethylene on the surface of this concave-convex structure to achieve the non-stick performance of the product. Although the polytetrafluoroethylene in the grooves of this structure is less likely to be scraped off by a spatula, there is still a risk of falling off in the case of bumps, etc., and there is also a risk that the polytetrafluoroethylene decomposes at high temperatures, posing a safety hazard. In addition, this non-stick structure is only suitable for good non-stick effect in oil cooking, and there is still a problem that the rice sticks to the pan during rice cooking and cannot be completely solved.

[0049] To solve this defect, through the long-term research and multiple experimental tests of the inventor, the bottleneck of the prior art was finally broken through, and a non-stick inner liner was developed. This structure has non-stick properties and wear resistance and will not decompose like polytetrafluoroethylene at high temperatures, and also has good non-stick performance during rice cooking.

[0050] The following will describe in detail some embodiments of the present application with reference to the drawings. Without conflict, the features in the following embodiments can be combined with each other.

[0051] The cooking utensils in the present application include dining utensils and cooking utensils.

[0052] Embodiment 1

[0053] Please refer to Figure 1 , this embodiment discloses a spherical non-stick inner liner 100. The non-stick inner liner 100 has an inner surface 1. At the bottom of the inner surface 1 of the inner liner 100, there is a bottom area 10. One end of the inner liner 100 away from the bottom area 10 has an opening, and there is a rim 11 at the opening.

[0054] Please refer to Figures 1 - 3, the inner surface 1 includes a non-stick surface 12 and a sealing surface 13. The non-stick surface 12 covers at least the bottom area 10 of the inner container 100, and the sealing surface 13 covers at least the rim 11 of the inner container 100. The roughness of the sealing surface 13 is less than that of the non-stick surface 12.

[0055] Please refer to Figure 2 and Figure 3 , the side wall 2 of the inner container 100 is arc-shaped, and the joint of the non-stick surface 12 and the sealing surface 13 is located at the maximum latitude circle radius 3 of the side wall 2 or between the maximum latitude circle radius 3 and the rim 11.

[0056] Please refer to Figure 3 , the maximum latitude circle radius 3 is at the maximum diameter of the side wall 2 of the inner container 100.

[0057] Please refer to Figure 4 , a straight cylindrical inner container 100 is disclosed. The straight cylindrical inner container 100 also includes a sealing surface 13, a non-stick surface 12, a rim 11 and a side wall 2. Different from the spherical inner container 100, the side wall 2 is not arc-shaped, and the diameters of the side walls 2 at different heights are the same.

[0058] Please refer to Figure 5 and Figure 6 , the non-stick surface 12 in this embodiment includes an uneven structure 121 with a plurality of concave portions 1211 and convex portions 1212. The concave portion 1211 is a spherical concave pit 123. The roughness of the surface of the concave pit 123 is ≤ 3.2 microns. The diameter of the concave pit 123 is 0.2 - 0.95 mm, preferably 0.4 - 0.65 mm. The concave pit 123 is a spherical concave pit 123 formed by spraying steel shot with a diameter of 0.3 - 1.9 mm into the inner surface 1 of the inner container 100 under a pressure of 2 Mpa - 8 Mpa. The diameter of the concave pit 123 mentioned above is the spherical diameter. The center-to-center distance a of the concave pits 123 ranges from 0.3 - 0.8 mm, preferably 0.6 mm. The range of the center-to-center distance a here refers to the distance between the centers of the spherical concave pits 123. In some embodiments, it is also possible to process cross-sections into circles, ellipses or polygons according to design requirements through processing methods such as rolling and stamping. For example, polygons such as hexagons or quadrilaterals. If the concave pit 123 is a polygon, the polygons can be evenly distributed by rolling or designed to be irregularly arranged and then stretched into shape according to needs. The diameter of the inscribed circle of the polygon is 0.2 - 0.95 mm, preferably 0.4 - 0.65 mm.

[0059] Please refer to Figure 6, the convex portion 1212 has a hilly morphology surrounding the concave portion 1211, and the surface roughness of the concave portion 1211 is less than that of the convex portion 1212. The concave portion 1211 and the convex portion 1212 are integrally structured with the inner liner 100 substrate, and a physical vapor deposition layer 122 is provided on at least a part of the surface of the concave portion 1211 and / or a part of the convex portion 1212. The physical vapor deposition layer 122 is in direct contact with at least a part of the surface of the concave portion 1211 and / or a part of the convex portion 1212. The morphology of the surface of the physical vapor deposition layer 122 is similar to that of the concave portion 1211 and the convex portion 1212 it covers.

[0060] Please refer to Figure 7 , the non-stick inner liner in this embodiment is formed by subjecting the inner surface 1 of the inner liner to high-speed impact with steel shots to integrally machine the concave-convex structure 121 in a set area and then performing PVD coating. Therefore, the concave-convex structure 121 is made of the same material as the inner liner substrate.

[0061] Please refer to Figure 6 and Figure 7 , the concave-convex structure 121 is a surface formed by connecting the convex portions 1212 in a hilly shape formed by extrusion between the pits 123 machined on the inner surface 1 of the inner liner. The height difference b between the concave and convex, that is, the distance from the highest point of the convex portion 1212 to the lowest point of the concave portion 1211, is 45 - 85 microns, and preferably 55 - 75 microns. The concave-convex structure 121 is integrally structured with the inner liner substrate, and the physical vapor deposition layer 122 is in direct contact with the surface of the concave-convex structure 121.

[0062] According to the design requirements of different products, a physical vapor deposition layer 122 is provided on at least a part of the surface of the concave-convex structure 121. By setting and controlling the PVD coating process parameters, the morphology of the surface of the physical vapor deposition layer 122 is made similar to that of the concave-convex structure 121 it covers, so as to achieve the non-stick effect of the inner surface 1 of the inner liner. The physical vapor deposition layer 122 is in direct contact with the concave-convex structure 121, and a thickness of the physical vapor deposition layer 122 of 0.8 - 1.45 microns can achieve better technical effects.

[0063] The adhesion of the PVD coating in direct contact with the metal substrate is poor, and good wear resistance cannot be guaranteed. A transition layer needs to be set between the PVD coating and the metal substrate to improve the bonding performance. For example, the patents with application numbers CN202121169683.5 and CN202222426611.5 both adopt the scheme of adding a transition layer between the metal substrate and the physical vapor deposition layer 122 to achieve the bonding of the metal substrate and the physical vapor deposition layer 122. The transition layer can have good adhesion to both the coating and the metal substrate, so as to ensure good adhesion between the PVD coating and the metal substrate and prevent it from falling off easily. Through theoretical analysis and long-term experimental tests on the non-stick inner liner of this application, a new structure has been developed. The corresponding concave-convex structure 121 is directly processed on the surface of the inner liner made of metal material, which can not only achieve good adhesion between the PVD coating and the inner liner substrate, but also improve the non-stick property of the inner liner surface, and has wear-resistant performance, and can maintain the wear-resistant and non-stick performance of the inner liner surface for a long time. The substrate of this inner liner is metal materials such as carbon steel, alloy steel, stainless steel and titanium alloy.

[0064] Through testing, when the physical vapor deposition thickness is in the range of 0.8 - 1.45 um and the concave-convex height difference b is 45 - 85 um, the adhesion can reach level 2, the hardness range is 1500 - 2000 HV, the non-stick effect of frying eggs is grade II, and the cost performance is the highest.

[0065] Example Two

[0066] Please refer to Figure 8 and Figure 9, different from the first embodiment, multiple concave portions 1211 are machined on the inner surface 1 of the inner container, and convex portions 1212 are formed between the concave portions 1211. The concave portions 1211 can be formed by etching, impact, rolling or stamping. The depth of the concave portions 1211 is between 0.1 mm and 0.9 mm. Multiple pits 123 are machined on the surfaces of the concave portions 1211 and the convex portions 1212, and hilly protrusions 124 are provided between the pits 123. The spherical diameter of the pits 123 is 0.2 - 0.95 mm, preferably 0.4 - 0.65 mm. The center - to - center distance a of the pits 123 ranges from 0.3 mm to 0.8 mm, preferably 0.6 mm. According to different product requirements, the surface roughness of the concave portions 1211 can be designed to be ≤3.2 μm. The pits 123 are spherical pits formed by spraying steel shots with a diameter of 0.6 - 1 mm onto the inner surface 1 of the inner container 100 at a pressure of 2 Mpa - 8 Mpa. The height difference b between the convex and concave parts (in this embodiment, it is the distance from the highest point of the protrusion 124 to the lowest point of the pit 123) is 45 - 85 μm, optimally 55 - 75 μm; the center - to - center distance a of the pits 123 ranges from 0.3 mm to 0.8 mm, optimally 0.6 mm. The range of the center - to - center distance a here refers to the distance between the centers of the spherical pits 123. In this embodiment, a multi - level convex - concave structure 121 can be generated on the inner surface 1 of the inner container, and both the bonding property with PVD and the surface wear resistance of the product can be improved.

[0067] In some embodiments, it is also possible to use processing methods such as rolling and stamping to machine a cross - section that is circular, elliptical or polygonal according to design requirements. The polygon can be, for example, a hexagon or a quadrilateral, and then it is stretched into shape. If the pits 123 are polygonal, the polygons can be evenly distributed by rolling or designed to be irregularly arranged according to needs. The diameter of the inscribed circle of the polygon is 0.2 - 0.95 mm, preferably 0.4 - 0.65 mm.

[0068] Embodiment Three

[0069] Please refer to Figure 10 and Figure 11 , different from the first embodiment, an electrolytic layer or a plasma polishing layer is further provided between the convex - concave structure 121 and the physical vapor deposition layer 122.

[0070] Please refer to Figure 10 , the convex - concave structure 121 composed of the concave portions 1211 and the convex portions 1212 on the inner surface 1 of the inner container is the same as that in the first embodiment, and will not be elaborated here.

[0071] Please refer to Figure 11 , the electrolytic layer or the plasma polishing layer is to machine a nano - or micro - scale irregular rough surface on the surfaces of the concave portions 1211 and the convex portions 1212 through electrolysis or plasma polishing. The processing in this embodiment is formed by electrolytic processing.

[0072] In some embodiments, there are multiple combination processing methods. For example, an electrolytic layer or a plasma polishing layer is provided on the surface of some of the concave-convex structures 121. A physical vapor deposition layer 122 coating is plated on the surface of some of the electrolytic layer / plasma polishing layer, or some of the concave-convex structures 121, or some of the concave-convex structures 121 and some of the electrolytic layer / plasma polishing layer, so as to form a variety of combined structures on the inner surface 1 of the inner pot, and different surface effects can be achieved according to different usage requirements, or different surface effects can be achieved in different regions on the surface of the inner pot.

[0073] Embodiment 4

[0074] Please refer to Figure 2 , this embodiment discloses a cooking appliance, specifically an electric rice cooker or a pressure cooker, including any one of the non-stick inner pots in Embodiments 1 to 3. The cooking appliance further includes a sealing ring, which is in contact sealing connection with the sealing surface 13 of the non-stick inner pot in the working state, so as to realize a relatively closed space inside the non-stick inner pot.

[0075] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes, modifications, substitutions and variations, and all of these changes, modifications, substitutions and variations fall within the scope of the present invention claimed.

Claims

1. A non-stick inner liner, characterized in that, The inner container (100) has an inner surface (1), the inner surface (1) includes a non-stick surface (12) and a sealing surface (13), the non-stick surface (12) covers at least the bottom area (10) of the inner container (100), the sealing surface (13) covers at least the rim (11) of the inner container (100), the non-stick surface (12) includes a concavo-convex structure (121) with a plurality of concave portions (1211) and convex portions (1212), the roughness of the sealing surface (13) is less than the roughness of the non-stick surface (12), and a physical vapor deposition layer (122) is provided on the surface of at least part of the concave portions (1211) and / or part of the convex portions (1212).

2. The non-stick inner liner according to claim 1, wherein, The convex portion (1212) has a hilly morphology surrounding the concave portion (1211), and the surface roughness of the concave portion (1211) is less than the surface roughness of the convex portion (1212).

3. The non-stick inner liner according to claim 1, wherein At least part of the surface of at least part of the concave portions (1211) and / or at least part of the convex portions (1212) has a plurality of spherical pits (123), there are hilly protrusions (124) between the pits (123), and the surface roughness of the pits (123) is less than the surface roughness of the protrusions (124).

4. The non-stick inner liner according to any one of claims 1-3, characterized in that, The concave portions (1211) and the convex portions (1212) are of an integral structure with the base material of the inner container (100), and the physical vapor deposition layer (122) is in direct contact with the surface of at least part of the concave portions (1211) and / or part of the convex portions (1212).

5. The non-stick inner liner according to any one of claims 1-3, characterized in that, An electrolytic layer or a plasma polishing layer is provided on the surface of at least part of the concave portions (1211) and / or at least part of the convex portions (1212), and the electrolytic layer or the plasma polishing layer is in direct contact with the physical vapor deposition layer (122).

6. The non-stick inner liner according to claim 1, wherein The side wall (2) of the inner container (100) is arc-shaped, and the junction of the non-stick surface (12) and the sealing surface (13) is located at the maximum latitude circle radius (3) of the side wall (2) or between the maximum latitude circle radius (3) and the rim (11).

7. The non-stick inner liner according to claim 2, characterized in that, The concave portion (1211) is a spherical pit (123), the spherical diameter of the pit (123) is 0.2 - 0.95 mm; the center-to-center distance (a) of the pits (123) ranges from 0.3 - 0.8 mm.

8. The non-stick inner liner according to claim 3, wherein The spherical diameter of the pit (123) is 0.2 - 0.95 mm; the center-to-center distance (a) of the pits (123) ranges from 0.3 - 0.8 mm.

9. A cooking appliance, characterized in that, It includes a non-stick inner container (100) according to any one of claims 1 - 8.

10. The cooking appliance according to claim 9, wherein, It further includes a seal, and in the working state, the seal is in contact sealing connection with the sealing surface (13).

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