Pot container and cooking utensil

Abstract

The utility model provides a pot container and a cooking utensil. The containing cavity of the pot container base body is provided with a microstructure, the microstructure comprises a plurality of pits randomly distributed in part of the inner surface, the area occupied by the pits in part of the inner surface is S < concave >, the area of part of the inner surface is S < inner >, and the S < concave > is 65% S < inner >-98% S < inner >; the lower concave surface of each pit is a part of a spherical surface; the size D concave of the opening span of a single concave pit on the inner surface is 0.05 mm-0. 5mm, and / or the depth H concave of the concave pit is 0.05 mm-0. 5mm; the glossiness of the part, provided with the microstructure, of the inner surface ranges from 20 GU to 40 GU. The contact area with rice can be effectively reduced in the cooking process through the microstructures arranged on the cooker container, meanwhile, the cambered concave-convex structures can generate centripetal film shrinkage force after a starch film generated in the cooking process is gelatinized, and the starch film is separated from the surface of the base material through the film shrinkage force to achieve the physical non-sticky effect.

Description

Technical Field

[0001] This utility model relates to the field of cooking utensil technology, and more specifically to a pot inner and a cooking utensil. Background Technology

[0002] In functional surface treatments for cookware pot interiors, the compatibility between the substrate surface microstructure design and the coating process directly affects the product's wear resistance, non-stick properties, and lifespan. In existing technologies, the substrate surface is often treated with chemical etching or mechanical sandblasting to create micron-level pit structures to reduce food adhesion. Chemically etched pits are often polygonal, with sharp edges that easily embed food residue, requiring vigorous rinsing during cleaning and proving difficult to remove completely. Mechanically sandblasted pits exhibit large fluctuations in curvature and high surface roughness. These pits increase the difficulty of coating coverage and accelerate film peeling after coating.

[0003] Therefore, there is a need to provide a pot inner and cooking utensil to at least partially solve the above problems. Utility Model Content

[0004] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] To at least partially solve the above problems, the first aspect of this utility model provides a pot inner liner for a cooking utensil, comprising:

[0006] The pot liner includes a pot liner substrate forming a receiving cavity. At least a portion of the inner surface of the receiving cavity is provided with microstructures, the microstructures including a plurality of pits randomly distributed on the inner surface of the portion, the area occupied by the pits on the inner surface of the portion being S. 凹 The area of ​​the inner surface of the portion is S. 内 S 凹 65%S 内 ~98%S 内 ;

[0007] The concave surface of a single pit is part of a sphere;

[0008] The dimension D of the opening span of a single said recess on the inner surface 凹 The depth H of the pit is 0.05mm to 0.5mm. 凹 The thickness is 0.05mm to 0.5mm;

[0009] The gloss of the inner surface of the portion with the microstructure is 20 GU to 40 GU.

[0010] At least a portion of the inner surface of the pot pot is provided with a microstructure. Since the microstructure is randomly stacked on the inner surface of the pot pot with a density of 70% to 95% for micron-sized concave spherical surfaces, and the gloss of the at least a portion of the inner surface is set to 20 GU to 40 GU, this structure can effectively reduce the contact area with rice during the cooking process. At the same time, the arc-shaped concave-convex structure can generate a centripetal film contraction force after the starch film generated during the cooking process gelatinizes. The film contraction force causes the starch film to detach from the substrate surface, thereby achieving a physical non-stick effect.

[0011] Optionally, the pot base has a geometric central axis, and on the cross section passing through the geometric central axis, the cross-sectional profile of the pit is an arc with a radius of curvature change of ≤10%.

[0012] Optionally, the pot base is a body of revolution with a central axis, and the cross-sectional profile of the pit on the cross-section passing through the central axis is an arc with a radius of curvature change of ≤10%.

[0013] According to this scheme, the pits are smooth and flat with good curvature, and the cross-sectional profile of the pits is approximately an ideal arc, which is conducive to uniform deposition, optimizes the adhesion of the PVD coating layer, and improves wear resistance and peel resistance.

[0014] Optionally, a PVD coating layer is provided on the inner surface of the portion, and the thickness of the PVD coating layer is 0.1μm~1.1μm.

[0015] According to this solution, the PVD coating layer is ensured to be sufficiently wear-resistant without affecting the surface microstructure characteristics, uniformly covering the pit structure, enhancing adhesion and durability, and reducing the risk of peeling.

[0016] Optionally, the PVD coating layer comprises titanium atoms and nickel atoms, with the remaining materials mainly being chromium nitride. The mass percentage of titanium atoms is 3% to 10%, and / or the mass percentage of nickel atoms is 5% to 8%.

[0017] According to this scheme, the PVD coating layer reduces surface energy and significantly improves the non-stick performance of the pot liner by adjusting the mass ratio of titanium atoms and / or nickel atoms with the synergistic ratio of chromium nitride.

[0018] Optionally, the Vickers hardness of the PVD coating layer is greater than 1200 HV.

[0019] According to this solution, the PVD coating layer has extremely high hardness and high wear resistance, and can be used for a long time without being easily scratched or peeled off.

[0020] Optionally, the PVD coating layer is a metal film or a metal-ceramic film.

[0021] According to this solution, the PVD coating layer can protect the substrate and provide better non-stick properties.

[0022] Optionally, the gloss of at least a portion of the inner surface to which the PVD coating is applied is 30 GU to 40 GU.

[0023] According to this scheme, the inner surface of this gloss range has a good bonding effect with the PVD coating layer.

[0024] Optionally, the roughness Ra of at least a portion of the inner surface to which the PVD coating is attached is 2.5 μm to 3.5 μm.

[0025] According to this scheme, the inner surface of the pot liner with this roughness range has a good bonding effect with the PVD coating layer.

[0026] Optionally, the material of the pot body is stainless steel.

[0027] According to this scheme, the matrix has good corrosion resistance and mechanical strength.

[0028] Optionally, the pot body substrate includes a first metal layer, a heat-conducting layer, and a second metal layer connected sequentially from the inside to the outside along its thickness direction, and the inner surface is composed of the first metal layer, the first metal layer being made of 304 stainless steel or 316 stainless steel.

[0029] According to this scheme, the substrate has good corrosion resistance and mechanical strength; by sandwiching the thermally conductive layer between the two metal layers, a closed heat conduction path can be formed, which is conducive to the uniform distribution and rapid transfer of heat.

[0030] Optionally, the partial inner surface refers to the inner surface of the bottom of the receiving cavity and the inner surface at the junction of the bottom side portion.

[0031] Optionally, the inner surface of the bottom side connection refers to the portion of the inner surface of the cooking cavity where the angle between the tangent of the surface and the vertical plane perpendicular to the horizontal plane is equal to or greater than 30°.

[0032] According to this solution, the bottom and bottom side connection of the inner pot are areas that are frequently in contact with food. By setting microstructures in these areas, non-stick performance can be achieved at low cost and high efficiency.

[0033] The second aspect of this utility model provides a cooking utensil, which includes the aforementioned inner pot.

[0034] According to this solution, the cooking appliance has a similar technical effect to the aforementioned pot inner liner. Attached Figure Description

[0035] The following drawings, which illustrate embodiments of the present invention, are incorporated herein by reference as part of the present invention and are used to understand the invention. The drawings show embodiments of the present invention and their descriptions, serving to explain the principles of the invention. In the drawings,

[0036] Figure 1 This is a cross-sectional schematic diagram of the inner pot of a preferred embodiment of the present invention.

[0037] Figure 2 This is a cross-sectional schematic diagram of the inner pot of another preferred embodiment of the present invention.

[0038] Figure 3 This is a cross-sectional schematic diagram of the inner pot of a preferred embodiment of the present invention.

[0039] Figure 4 for Figure 3 An enlarged schematic diagram of part A in the diagram;

[0040] Figure 5 This is a schematic diagram showing the contact between the inner surface of the pot's inner substrate and the rice.

[0041] Figure 6 This is an enlarged schematic diagram of the contact between the inner surface of the pot base and the rice. In the diagram, the gelatinized starch film of the rice forms a shrinkage force after it solidifies on the composite board.

[0042] Figure 7 This is an enlarged schematic diagram of the contact between the inner surface of the pot base and the rice. In the diagram, the contraction force drives the gelatinized starch film to detach from the surface of the composite board.

[0043] Explanation of reference numerals in the attached figures

[0044] 10: Pot Inner Wall

[0045] 100: Pot base

[0046] 101: Inner surface

[0047] 102: Outer surface

[0048] 110: Dent

[0049] 120: PVD coating layer Detailed Implementation

[0050] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with embodiments of the present invention.

[0051] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0052] In this document, ordinal numbers such as "first" and "second" used in this invention are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term "first component" does not imply the existence of "second component," and the term "second component" does not imply the existence of "first component."

[0053] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0054] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0055] Unless otherwise stated, the numerical ranges in this document include not only the entire range within its two endpoints, but also the subranges contained therein.

[0056] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present invention is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art.

[0057] Reference Figures 1-4 This utility model provides a pot inner 10 for cooking utensils, including a pot inner substrate 100 and a PVD coating layer 120.

[0058] In this design, the pot liner 10 includes a pot liner substrate 100 forming a receiving cavity, and at least a portion of the inner surface 101 of the receiving cavity is provided with microstructures. Optionally, the inner surface 101 of the pot liner 10 may directly contact the food or provide a base for the adhesion of the PVD coating layer 120.

[0059] At least a portion of the inner surface 101 of the receiving cavity is provided with microstructures. The microstructures include a plurality of pits 110 randomly distributed on the portion of the inner surface. The area occupied by the pits 110 on the portion of the inner surface 101 is S. 凹 The area of ​​part of the inner surface is S 内 S 凹 65%S 内 ~98%S 内 In practical applications, this value range can be finely adjusted, so it is not strictly limited here. The concave surface of a single pit 110 is part of a sphere. The gloss of the inner surface with the microstructure is 20 GU to 40 GU. At least a portion of the inner surface 101 of the pot liner 10 is provided with a microstructure. Since the microstructure is randomly stacked on the inner surface 101 of the pot liner 10 with a density of 65% to 98% for micron-level concave spherical surfaces, and the gloss of the at least a portion of the inner surface is set to 20 GU to 40 GU, this structure can effectively reduce the contact area with rice during the cooking process. At the same time, the curved concave-convex structure can generate a centripetal film contraction force after the starch film generated during the cooking process gelatinizes. The film contraction force causes the starch film to detach from the substrate surface, thereby achieving a physical non-stick effect. The opening span D of a single pit 110 on the inner surface is... 凹 The depth H of the pit 110 is 0.05mm to 0.5mm. 凹 The value is 0.05mm to 0.5mm. In practical applications, this range can be slightly adjusted, so it is not strictly limited here.

[0060] Optionally, the dimension D of the opening span of a single recess 110 on the inner surface... 凹 The diameter is 0.05mm to 0.5mm. 凹 The diameter can be, but is not limited to, 0.05mm, 0.2mm, 0.3mm, 0.5mm, etc., with 0.3mm being preferred. If the opening diameter of the pit 110 is too small, the number of pits 110 per unit area increases, but it is easily filled or blocked by starch or impurities, affecting the physical non-stick effect. If the opening diameter of the pit 110 is too large, it will lead to an increase in contact area, a decrease in the physical non-stick effect, and also affect surface strength and wear resistance. The dimension D of the opening span of a single pit 110 on the inner surface is... 凹 With a diameter of 0.05mm to 0.5mm, it can accommodate the formation and shrinkage of starch films, ensuring the ability of starch films to detach. This size range also ensures the uniformity of the PVD coating layer during physical vapor deposition (PVD) 120, preventing localized stress concentration that could lead to peeling or cracking.

[0061] Optionally, the depth H of the pit 110 凹The depth H of the pit 110 can be 0.05mm to 0.5mm, but is not limited to 0.05mm, 0.2mm, 0.25mm, 0.5mm, etc., with 0.2mm being preferred. If the depth of the pit 110 is too shallow, it is difficult to form a stable starch film shrinkage structure, resulting in poor physical non-stick properties. If the depth of the pit 110 is too deep, it may cause a local decrease in the mechanical strength of the pot substrate 100 and affect the uniform coverage of the PVD coating layer 120. The depth H of the pit 110... 凹 With a depth of 0.05mm to 0.5mm, it can form and stabilize a starch film during cooking while maintaining good non-stick properties to prevent food residue. This depth range also ensures the structural strength of the substrate without affecting its overall mechanical properties.

[0062] Reference Figure 4 The area occupied by the pit 110 on part of the inner surface 101 is S. 凹 65%S 内 ~98%S 内 Optionally, S 凹 / (S 凹 +S 内 The percentage of the projected area of ​​the recesses 110 on the inner surface 101 can be, but is not limited to, 65%, 80%, 90%, or 98%. If the percentage of the projected area of ​​the recesses 110 on the inner surface 101 is too small, the recesses 110 will be insufficiently distributed, resulting in a larger contact area and a lower physical non-stick effect. If the percentage of the projected area of ​​the recesses 110 on the inner surface 101 is too large, or the percentage of the projected area of ​​the protrusions on the inner surface 101 is too small, it may lead to a decrease in the mechanical strength of the pot base substrate 100. A percentage of 65% to 98% for the projected area of ​​the recesses 110 on the inner surface 101 ensures sufficient coverage of the recesses 110, which can significantly reduce adhesion to rice while maintaining sufficient load-bearing capacity of the substrate and enhancing structural stability. This percentage can also optimize the uniformity of the PVD coating layer 120, ensuring that the PVD coating layer 120 will not experience uneven wear due to local defects.

[0063] Based on the above, an appropriate size (D) 凹 H 凹 The recessed structure 110 with high coverage (65%~98%) reduces the contact area of ​​food, allowing the PVD coating layer 120 to cover the food evenly. This ensures that the pot base substrate 100 has sufficient mechanical strength, enabling the pot base substrate 100 to form a uniform microscopic heat exchange structure, resulting in more even heat distribution and improved cooking efficiency. During the cooking process, the formed starch film shrinks more effectively, thus enhancing the physical non-stick effect.

[0064] In this design, the inner pot 10 can be a standardized round inner pot or an irregularly shaped inner pot.

[0065] In some embodiments, the pot base 100 has a geometric central axis, and on a cross section passing through the geometric central axis, the cross-sectional profile of the recess 110 is an arc with a radius of curvature change of ≤10%.

[0066] In other embodiments, the pot base 100 is a body of revolution with a central axis, and the cross-sectional profile of the recess 110 on the cross-section passing through the central axis is an arc with a radius of curvature change of ≤10%.

[0067] The cross-sectional profile of the pit 110 is an arc shape with a curvature radius variation of ≤10%. That is, the cross-sectional profile of the pit 110 is an approximately ideal arc. The inner surface 101 of the pot substrate 100 has a micron-level arc-shaped pit 110 surface, ensuring that the rice only forms point contact in the raised areas, rather than spreading over a large area, significantly reducing the direct contact area with the inner surface 101 of the pot substrate 100. When applying a PVD coating using physical vapor deposition, the morphology of the inner surface 101 affects the quality of the PVD coating layer 120. An arc shape with a small change in curvature radius is beneficial for uniform deposition, avoiding uneven coating thickness or stress concentration caused by large changes in curvature radius, optimizing the adhesion of the PVD coating layer 120, and improving wear resistance and peel resistance.

[0068] Based on the foregoing, the PVD coating layer 120 is adhered to the inner surface 101 and covers the pits 110 via physical vapor deposition. The surface contour of the PVD coating layer 120 conforms to the surface contour of the pits 110. The PVD coating layer 120 can be uniformly deposited to conform to the curved surface of the pits 110, making the entire inner surface 101 of the pot substrate 100 smooth and flat, while also possessing the structural characteristics of the pits 110, which can further reduce the risk of adhesion. In this solution, through physical vapor deposition technology, the PVD coating layer 120 can be more firmly adhered to the pits 110 of the pot substrate 100, and the bonding force between the PVD coating layer 120 and the pot substrate 100 is strong, reducing the risk of detachment or peeling during use. The PVD coating layer 120 significantly improves the surface hardness and wear resistance of the pot substrate 100, while also enhancing its corrosion resistance and chemical resistance. The inner surface 101 of the pot substrate 100 after physical vapor deposition treatment has excellent durability and easy cleaning properties, further improving the product's performance.

[0069] According to this scheme, an arc-shaped recess 110 is formed on the inner surface 101 of the pot substrate 100, and a PVD coating layer 120 is deposited on the inner surface 101 and the recess 110. Finally, a smooth, flat outer surface with well-rounded recesses 110 is formed on the pot substrate 100, reducing the adhesion of the rice starch layer to the pot substrate 100. (Refer to...) Figures 3-7During the cooking process, the starch in the rice gelatinizes and forms a starch film on the surface of the inner pot 10. As the moisture evaporates and the starch film gradually cools and solidifies, the curved, uneven structure guides the film to shrink, generating a centripetal contraction force that causes the starch film to peel off from the surface of the inner pot 10. The inner pot 10 according to this design, unlike traditional chemically coated non-stick pans, represents a more durable and long-lasting physical non-stick method.

[0070] Optionally, a PVD coating layer 120 is provided on the inner surface 101 of the pot substrate 100, and the thickness of the PVD coating layer is 0.1μm to 1.1μm. In practical applications, this value range can be slightly adjusted, so it is not strictly limited here. The thickness of the PVD coating layer 120 can be, but is not limited to, 0.1μm, 0.2μm, 0.4μm, 0.6μm, 0.8μm, 1μm, 1.1μm, etc., and is preferably 0.6μm. If the thickness of the PVD coating layer 120 is too thin, the PVD coating layer 120 is prone to wear or failure, and its wear resistance is insufficient. If the thickness of the PVD coating layer 120 is too thick, the PVD coating layer 120 is prone to cracking or peeling, increasing production costs and potentially affecting heat transfer efficiency. The thickness of the PVD coating layer 120 is 0.1μm~1.1μm, ensuring that the PVD coating layer 120 is sufficiently wear-resistant, while not affecting the surface microstructure characteristics, uniformly covering the uneven structure, enhancing adhesion and durability, and reducing the risk of peeling.

[0071] In some embodiments of this invention, the PVD coating layer 120 comprises titanium atoms and nickel atoms, with the remaining material mainly being chromium nitride. The mass percentage of titanium atoms is 3% to 10%, and / or the mass percentage of nickel atoms is 5% to 8%. In practical applications, this range can be appropriately adjusted, and therefore is not strictly limited here. The mass percentage of titanium atoms can be, but is not limited to, 3%, 5%, 8%, 10%, etc., preferably 8%. The mass percentage of nickel atoms can be, but is not limited to, 5%, 7%, 8%, preferably 7%. By controlling the synergistic ratio of the mass percentage of titanium atoms and / or nickel atoms with chromium nitride, the PVD coating layer 120 reduces surface energy and significantly improves the non-stick performance of the pot liner 10.

[0072] In some embodiments of this invention, the Vickers hardness of the PVD coating layer 120 is greater than 1200 HV. The Vickers hardness of the PVD coating layer 120 can be, but is not limited to, 1220 HV, 1250 HV, 1300 HV, 1350 HV, etc., but is preferably 1300 HV. The PVD coating layer 120 has extremely high hardness, high wear resistance, and can be used for a long time without being easily scratched or peeled.

[0073] In some embodiments of this invention, the PVD coating layer 120 is a metal film or a metal-ceramic film. Optionally, the metal film includes chromium and / or titanium. Titanium has high toughness. Chromium has excellent wear resistance, corrosion resistance, and high-temperature stability. By incorporating a metal film containing chromium and / or titanium, cracking of the PVD coating layer 120 can be effectively prevented, while also absorbing and dispersing stress to a certain extent, thus improving the overall impact resistance of the PVD coating layer 120. The metal-ceramic film combines the thermal conductivity of metal with the high hardness and wear resistance of ceramics, exhibiting better oxidation resistance, high-temperature resistance, and scratch resistance.

[0074] In some embodiments of this invention, the gloss of at least a portion of the inner surface to which the PVD coating layer 120 is attached is 30 GU to 40 GU. The gloss of at least a portion of the inner surface to which the PVD coating layer 120 is attached can be, but is not limited to, 30 GU, 33 GU, 35 GU, 38 GU, or 40 GU, but is preferably 35 GU. This gloss range results in good adhesion between the inner surface and the PVD coating layer 120. If the gloss is too low, the surface microstructure may become too rough, weakening the adhesion of the PVD coating layer 120; if the gloss is too high, the surface becomes too smooth, and the PVD coating layer 120 is prone to peeling due to differences in thermal expansion. A gloss range of 30 GU to 40 GU balances the coating adhesion strength and surface uniformity.

[0075] In some embodiments of this invention, the roughness Ra of at least a portion of the inner surface to which the PVD coating layer 120 is attached is 2.5 μm to 3.5 μm. The roughness Ra of at least a portion of the inner surface to which the PVD coating layer 120 is attached can be, but is not limited to, 2.5 μm, 2.8 μm, 3 μm, 3.3 μm, or 3.5 μm, but is preferably 3 μm. If the roughness is too low, the PVD coating layer 120 is prone to peeling off; if the roughness is too high, the PVD coating layer 120 is prone to uneven coverage. A roughness of 2.5 μm to 3.5 μm can balance the coating bonding strength and surface uniformity, comprehensively improving the durability and non-stick properties of the pot liner 10.

[0076] In some embodiments of this utility model, the pot base 100 is made of stainless steel.

[0077] In some embodiments of this utility model, the pot base 100 includes a first metal layer, a heat-conducting layer, and a second metal layer sequentially connected along its thickness direction. The inner surface 101 is formed on the first metal layer, and the first metal layer is made of stainless steel. Optionally, the second metal layer is made of stainless steel. In some embodiments, the first metal layer and the second metal layer are made of different materials. For example, the first metal layer is made of 316 stainless steel or 304 stainless steel, and the second metal layer is made of 430 stainless steel. Optionally, the heat-conducting layer is made of aluminum. Optionally, the heat-conducting layer can also be made of other materials with high thermal conductivity.

[0078] In the above embodiments, stainless steel possesses good corrosion resistance and mechanical strength, making it suitable as the pot base 100, or as the outer and inner layers of the pot base 100, to protect the internal heat-conducting layer and enhance the stability of the overall structure. Aluminum has excellent thermal conductivity and is relatively lightweight, making it suitable as a heat-conducting layer to achieve efficient heat transfer. By sandwiching the heat-conducting layer between two metal layers, a closed heat conduction path can be formed, which is beneficial for uniform heat distribution and rapid heat transfer.

[0079] In some embodiments of this utility model, the inner surface 101 refers to the inner surface at the bottom of the receiving cavity and the inner surface at the junction of the bottom side, i.e. Figures 1-2 The area shown is a densely shot-peened zone. Figures 1-2 The sparse shot peening region shown can be selectively shot peened or not shot peened, wherein the area occupied by the pits 110 in the sparse shot peening region after shot peening is smaller than the area occupied by the pits 110 in the dense shot peening region.

[0080] In some embodiments of this utility model, the inner surface of the bottom side connection refers to the portion of the inner surface of the cooking cavity where the angle α between the tangent of the surface and the vertical plane perpendicular to the horizontal plane is equal to or greater than 30°.

[0081] According to this solution, the bottom and bottom side connection of the inner pot are areas that frequently come into contact with food. By setting microstructures in these areas, non-stick performance can be achieved cost-effectively and efficiently. The non-stick performance of the inner pot 10 is mainly designed to solve the problem of starchy foods sticking to the pot when cooking. Due to gravity, starch mainly stays on the inner surface of the bottom of the cavity and the inner surface 101 of the bottom connection side with a small angle of inclination relative to the horizontal plane. To address this problem specifically while considering cost, this solution allows the microstructures to be set only on this part of the inner surface, achieving a relatively low-cost solution that essentially solves the problem of starchy foods sticking to the entire inner pot 10.

[0082] The above describes the structure of the inner pot 10, wherein the pit 110 can be formed by shot peening, and the mass percentage of zirconia beads in the shot peening particles is at least 90%. Optionally, the zirconia beads are tetragonal zirconia. The shot peening particles themselves have excellent hardness and toughness. Optionally, the mass percentage of zirconia beads in the shot peening particles can be, but is not limited to, 90%, 92%, 95%, or 98%, preferably 95%.

[0083] In existing technologies, shot peening can also utilize glass beads, zirconium silicate beads, zirconium-aluminum composite beads, stainless steel beads, or silicon nitride beads. Among these, glass beads have low hardness and tend to break during shot peening; zirconium silicate and silicon nitride beads have higher hardness but are relatively brittle and easily break or shatter during the process; zirconium-aluminum composite beads are primarily composed of zirconium and aluminum, making them highly brittle and prone to breakage under strong impact; and stainless steel beads deform after shot peening. To comprehensively evaluate the performance of different shot peening media, specific experimental examples are provided below.

[0084] 1. Experimental materials:

[0085] (1) Substrate: Stainless steel plates with the same area and thickness were selected as test substrates.

[0086] (2) Shot peening particles: glass beads, zirconium oxide beads, zirconium silicate beads, zirconium aluminum composite beads, stainless steel beads, silicon nitride beads

[0087] 2. Experimental steps:

[0088] (1) Surface finish test:

[0089] Each shot peening particle was used to peen the surface of a stainless steel substrate. The shot peening parameters were: blasting pressure of 0.4 MPa and blasting time of 30 s.

[0090] The surface roughness of the stainless steel surface after shot peening is measured using a surface roughness meter (such as an optical roughness meter or a laser scanner).

[0091] Record the effect of each medium on surface finish and evaluate the finish level.

[0092] (2) Cycle usage test:

[0093] Stainless steel substrates were continuously shot peened using each type of shot peening particle, with each shot peening session lasting 30 seconds.

[0094] Regularly check for changes in the morphology of shot peening particles;

[0095] Record the changes in the effectiveness of each type of shot peening particle under different numbers of uses until they can no longer work effectively;

[0096] Count the effective number of times each type of shot peening particle is used.

[0097] 3. Experimental Data

[0098] Table 1 Comparative experiments of different shot peening particles

[0099] Material glass beads Zirconia beads Zirconium silicate beads Zirconium aluminum composite zirconium beads Stainless steel beads Main ingredients silicon dioxide Zirconia Zirconia Zirconia iron percentage 60% 95% 60~65% 30~60% >85% shape spherical spherical spherical spherical spherical Diameter (mm) 0.05~1 0.05~1 0.05~1 0.05~1 0.05~1 <![CDATA[Specific gravity g / cm 3 > 2.5~2.6 6.0 4.0 >3.3 7.8 sphericity 90% 98% 95% 98% 90% Vickers hardness HV 560 / 700 ≥1250 1000 >1050 700 Number of times to reuse 1~2 30~40 10~20 10~20 10~20 Shot peening effect High gloss, product appears whitish High gloss finish, natural metallic color Low gloss, product appears dull Low gloss, product appears dull Low gloss, product appears black

[0100] As shown in Table 1, zirconia beads are suitable for demanding shot peening applications, providing excellent surface finish, wear resistance, and durability, making them suitable for high-precision surface treatments. When shot peening particles impact a stainless steel surface, their kinetic energy is converted into deformation energy and fragmentation energy. If the energy converted into fragmentation energy exceeds the particle's fracture energy, the particle will break. However, during shot peening, the impact momentum is far less than the deformation and fragmentation energy levels. Therefore, typical breakage is due to stress concentration areas, and even minor damage during use can cause stress release and lead to fracture. The zirconia used in this solution, a material with high surface hardness, avoids fractures caused by localized damage.

[0101] As described above, this solution uses zirconia beads as shot peening particles. Zirconia beads have high hardness, effectively resisting wear and improving the durability of shot peening particles, making them suitable for surface treatment in long-term use. During the shot peening process, zirconia beads can act uniformly on the surface of the pot substrate 100, forming a uniform pit structure 110, which improves the adhesion of the subsequent PVD coating layer 120.

[0102] In some embodiments of this invention, the particle size of the shot peening particles is 0.5 mm to 1.5 mm. The particle size can be, but is not limited to, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, etc., but is preferably 1 mm. Shot peening particles of suitable size can act uniformly on the surface of the pot substrate 100, forming consistent surface features and avoiding uneven surface damage.

[0103] In some embodiments of this invention, the shot peening particles consist of 95% ZrO2 and 5% Y2O3 by mass. Zirconia (ZrO2) has extremely high hardness, while the addition of yttrium oxide (Y2O3) effectively improves the toughness of zirconium oxide, prevents excessively brittle surface cracking, and enhances the service life of the shot peening particles. When impacted on a stainless steel surface, the particles themselves do not break, and their smooth surfaces are not damaged. The indentations created on the stainless steel surface have good roundness and a smooth surface. The cooking cavity surface obtained after shot peening has micron-level arc-shaped indentations with a smooth surface structure. This structure effectively reduces the contact area with rice during cooking. Simultaneously, the arc-shaped uneven structure allows the starch film generated during cooking to produce a centripetal film contraction force after gelatinization. This film contraction force causes the starch film to detach from the substrate surface, achieving a physical non-stick effect.

[0104] In some embodiments of this invention, the Vickers hardness of the shot peening particles is ≥1250 HV. The Vickers hardness of the shot peening particles can be, but is not limited to, 1250 HV, 1300 HV, 1350 HV, etc., but is preferably 1250 HV. Higher hardness zirconia beads can withstand more impact and friction, increasing the service life of the shot peening particles.

[0105] In some embodiments of this invention, the density of the shot peening particles is 5 g / cm³. 3 ~7g / cm 3 The density of shot peening particles can be, but is not limited to, 5 g / cm³. 3 6g / cm 3 7g / cm 3 The preferred concentration is 6g / cm³. 3 Higher density means greater inertia in the shot peening particles, resulting in stronger impact force and a deeper surface penetration during the shot peening process. Simultaneously, the higher density of the shot peening particles reduces the likelihood of fragmentation, improving the consistency and stability of the shot peening process and ensuring the quality of the surface treatment.

[0106] In some embodiments of this invention, the sphericity of the shot peening particles is ≥90%. The sphericity of the shot peening particles can be, but is not limited to, 90%, 93%, 98%, or 99%, preferably 98%. The shape of the shot peening particles is close to a perfect sphere. Shot peening particles with high sphericity can act more uniformly on the surface of the pot substrate 100, and the change in the radius of curvature of the formed pits 110 is small.

[0107] In some embodiments of this invention, the shot peening process is recycled 30 to 40 times; the number of times the shot peening process can be, but is not limited to, 30, 32, 35, or 40 times, preferably 35. Because the shot peening particles can be recycled multiple times, the frequency of replacing the shot peening particles is reduced, thus reducing maintenance costs during long-term use.

[0108] In some embodiments of this invention, the surface gloss of the shot peening particles is 100 GU to 150 GU. The surface gloss of the shot peening particles can be, but is not limited to, 100, 120, 140, or 150; preferably, the surface gloss of the shot peening particles is 130. Because zirconia beads have highly smooth surface properties, the pits 110 they form on the stainless steel surface also have highly smooth surface properties, eliminating the need for further chemical or electropolishing to meet the surface roughness requirements.

[0109] In some embodiments of this invention, the roughness Ra of the shot peening particles is 0.05 μm to 0.1 μm. The roughness of the shot peening particles can be, but is not limited to, 0.05 μm, 0.2 μm, 0.3 μm, 0.5 μm, 0.8 μm, 1 μm, etc., preferably 0.3 μm. Because the shot peening particles have highly smooth surface properties, the pits they form on the stainless steel surface also have highly smooth surface properties, eliminating the need for post-chemical or electropolishing to meet the surface roughness requirements.

[0110] In some embodiments of this invention, the working pressure applied in the shot peening step is 0.3 MPa to 0.7 MPa; the working pressure of shot peening can be, but is not limited to, 0.3 MPa, 0.4 MPa, 0.5 MPa, 0.6 MPa, and 0.7 MPa, preferably 0.5 MPa. A moderate working pressure ensures that the shot peening particles impact the surface of the pot substrate 100 at a reasonable velocity, effectively forming pits 110 while avoiding excessive damage to the surface.

[0111] In some embodiments of this invention, the shot peening process is performed for 20 to 40 seconds. The shot peening time can be, but is not limited to, 20, 25, 30, or 40 seconds, but is preferably 30 seconds. An appropriate shot peening time ensures that the shot particles act uniformly on the surface of the pot substrate 100, forming an ideal surface structure, and avoids uneven surface treatment due to too short a time or excessive wear due to too long a time.

[0112] In this invention, the outer surface of the PVD coating layer 120 of the pot inner liner 10 faces inward. The mating structure of the PVD coating layer 120 and the recesses 110 provides non-stick properties. By ensuring the outer surface of the PVD coating layer 120 faces inward, food can directly contact the non-stick surface, effectively preventing food from sticking to the pot inner liner 10 and facilitating cleaning and maintenance. The PVD coating layer 120 also possesses high hardness and scratch resistance, protecting the pot inner liner 10 from scratches and wear from food and cooking utensils, thus extending its service life.

[0113] This utility model also provides a cooking utensil. The cooking utensil includes the aforementioned inner pot 10. The cooking utensil has similar technical effects to the aforementioned inner pot 10.

[0114] This utility model also discloses a method for manufacturing a pot inner liner, the method comprising:

[0115] S1. Step of preparing the pot base 100: Provide a pot base 100 with a geometric central axis, the pot base 100 having a receiving cavity;

[0116] Pretreatment is performed on the pot inner substrate 100;

[0117] S2. Shot peening step: Shot peening is performed on at least a portion of the inner surface of the receiving cavity of the pretreated pot base substrate 100 to form microstructures on the at least a portion of the inner surface.

[0118] The microstructure includes a plurality of pits randomly distributed on the inner surface of the portion, the area of ​​the inner surface occupied by the pits being S. 凹 The area of ​​the inner surface of the portion is S. 内 S 凹 65%S内 ~98%S 内 ;

[0119] The concave surface of a single pit is part of a sphere;

[0120] The dimension D of the opening span of a single said recess on the inner surface 凹 The depth H of the pit is 0.05mm to 0.5mm. 凹 The thickness is 0.05mm to 0.5mm;

[0121] The gloss of the inner surface of the portion with the microstructure is 20 GU to 40 GU.

[0122] According to this scheme, the manufacturing method of the inner pot 10 is simple, the shot peening particles have a good impact effect on the inner pot substrate 100, and the production cost is low. As mentioned above, the shot peening particles are made of zirconia beads, which have a high cycle life, and can further reduce the production cost.

[0123] The pot liner 10 prepared according to this scheme has some or all of the aforementioned technical features of the pot liner 10.

[0124] The step 100 of preparing the pot liner substrate provides an ideal surface for the subsequent shot peening and PVD coating process 120.

[0125] In some embodiments of this utility model, the step of preparing the pot base 100 includes:

[0126] S11, Stretching step: Stretching stainless steel or a sheet containing stainless steel into a pot base 100, the stretched pot base 100 forming a receiving cavity with an inner surface 110; and / or

[0127] S12. Polishing step: Polish the inner surface 101 of the cavity after stretching and forming. The gloss of the inner surface 101 after polishing is 80 GU~140 GU; and / or

[0128] After polishing, the surface roughness Ra of the inner surface is 0.1 μm to 0.5 μm; and / or,

[0129] S13. Dewaxing process: Dewaxing the inner surface 101.

[0130] In step S11, a stretching process is used to stretch stainless steel or a stainless steel-containing alloy sheet into the desired shape of the pot base 100. The stretching process can effectively extend the raw material into a thin sheet and maintain its surface uniformity and flatness.

[0131] After stainless steel is stretched, stretch marks will appear on the surface. Polishing is required to remove these marks and achieve a high degree of surface smoothness. In step S12, the inner surface 101 after stretching is polished. Polishing makes the inner surface 101 smooth and flat, which helps to improve the effect of subsequent shot peening and PVD coating 120. Optionally, plasma polishing can be used for the polishing step.

[0132] In step S113, the dewaxing process removes all wax, grease, or other contaminants that may affect subsequent processing steps, ensuring the inner surface 101 is clean and preventing any impact on the PVD coating layer 120 or shot peening effect. Optionally, talcum powder can be used for dewaxing, which removes contaminants without damaging the inner surface 101.

[0133] Alternatively, the polishing step and the physical vapor deposition step can be performed on the same equipment or separately.

[0134] In some embodiments of this invention, a cleaning step is included before and / or after the shot peening step: cleaning the inner surface 101. The cleaning step removes any oil, dust, oxides, or other impurities that may be present on the surface of the pot substrate 100, ensuring the surface reaches its optimal treatment state. Cleaning before the shot peening step ensures the surface is free of grease, impurities, or oxide layers, providing a clean surface for shot peening to ensure uniform and interference-free processing. Cleaning after the shot peening step removes dust or residue generated during the shot peening process, ensuring the surface of the pot substrate 100 is free of impurities and ready for subsequent PVD coating 120 or other treatments.

[0135] In some embodiments of this utility model, the manufacturing method of the inner pot 10 further includes a physical vapor deposition step: a PVD coating layer 120 is formed on the inner surface 101 by physical vapor deposition. The PVD coating layer 120 is attached to the inner surface 101 and covers the pits 110 and the protrusion structure. The surface contour of the PVD coating layer 120 is adapted to the surface contour of the pits 110.

[0136] The PVD coating layer prepared according to this method has some or all of the technical features of the aforementioned pot liner 10.

[0137] Optionally, in the physical vapor deposition step, the ejected material of the vapor deposition target is controlled to have a titanium atomic mass ratio of 3% to 10%, and / or a nickel atomic mass ratio of 5% to 8%, with the remainder mainly consisting of chromium nitride. According to this scheme, by adjusting the atomic ratio of titanium and nickel, combined with the chromium nitride matrix, the surface energy is reduced, significantly improving the non-stick performance of the pot liner 10.

[0138] The pot substrate 100 includes an outer surface 102 opposite to the inner surface 101. The outer surface 102 faces the outside of the pot substrate 10, and a sanding step is included after the physical vapor deposition step: the outer surface 102 is sanded. The main purpose of the sanding is to remove defects and sheet textures from the outer surface 102 of the pot substrate 10, and to form a uniform brushed texture on the surface for an aesthetic effect.

[0139] To comprehensively evaluate the impact of the pit 110 structure of the inner pot substrate 100 and the manufacturing method of the inner pot 10 on the non-stickiness of rice, specific experimental examples are provided below.

[0140] 1. Experimental materials:

[0141] (1) Substrate: Stainless steel pot liner 10 was selected as the test substrate.

[0142] (2) Shot peening particles: zirconia beads.

[0143] 2. Experimental steps:

[0144] (1) Pre-treatment of stainless steel plates;

[0145] (2) The inner surface 101 of the pretreated stainless steel plate is shot blasted.

[0146] (3) A PVD coating layer 120 is formed on the inner surface 101 of the stainless steel plate by physical vapor deposition.

[0147] Table 2

[0148] Shot peening time (s) Shot peening pressure (MPa) Material diameter (mm) Projection width D (μm) Indentation depth H (μm) Area ratio S1 / (S1+S2) Rice non-stick level 30 0.8 0.5~0.8 320 80 95 11g (Grade 2) 30 0.7 0.5~0.8 305 70 90 9g (Grade 2) 30 0.6 0.5~0.8 285 60 85 8g (Grade 2) 30 0.5 0.5~0.8 265 50 80 11g (Grade 2) 30 0.4 0.5~0.8 240 60 75 22g (Grade 2) 30 0.3 0.5~0.8 225 50 70 23g (Grade 2) 30 0.3 0.5~0.8 200 40 60 31g (Grade 2)

[0149] Table 2 shows that the lower the sandblasting pressure, the smaller the size, the shallower the depth, and the lower the density of the pit 110 structure, resulting in a decrease in the non-stick effect of rice (increased residue). This indicates that the pit structure parameters are positively correlated with the non-stick performance.

[0150] Table 3 Comparison of gloss and roughness of the inner surface of the pot liner substrate 110

[0151] state Gloss (GU) Roughness (Ra, μm) Before shot peening 80~140 0.1~0.5 After shot peening 20~40 2.5~3.5 After PVD 30~40 2.5~3.5

[0152] As shown in Table 3, shot peening can roughen the pot liner substrate 110, reduce gloss, and provide a foundation for coating anchoring. PVD can deposit a PVD coating layer on the rough surface, slightly improving gloss while retaining the rough structure. Ultimately, this balances coating adhesion while ensuring anti-stick performance and appearance requirements.

[0153] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of the invention. Terms such as “set” appearing herein can refer to either a component being directly attached to another component or a component being attached to another component via an intermediary. A feature described in one embodiment may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0154] This utility model has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this utility model to the described embodiments. Those skilled in the art will understand that many more variations and modifications can be made based on the teachings of this utility model, and all such variations and modifications fall within the scope of protection claimed by this utility model.

Claims

1. A pot inner liner, characterized in that, include: The pot liner includes a pot liner substrate forming a receiving cavity. At least a portion of the inner surface of the receiving cavity is provided with microstructures, the microstructures including a plurality of pits randomly distributed on the inner surface of the portion, the area occupied by the pits on the inner surface of the portion being S. 凹 The area of ​​the inner surface of the portion is S. 内 S 凹 65%S 内 ~98%S 内 ; The concave surface of a single pit is part of a sphere; The dimension D of the opening span of a single said recess on the inner surface 凹 The depth H of the pit is 0.05mm to 0.5mm. 凹 The thickness is 0.05mm to 0.5mm; The gloss of the inner surface of the portion with the microstructure is 20 GU to 40 GU.

2. The inner pot according to claim 1, characterized in that, The pot base has a geometric central axis, and on the cross section passing through the geometric central axis, the cross-sectional profile of the pit is an arc with a radius of curvature change of ≤10%.

3. The inner pot according to claim 1, characterized in that, The pot base is a rotating body with a central axis. On the cross section passing through the central axis, the cross-sectional profile of the pit is an arc with a radius of curvature change of ≤10%.

4. The inner pot according to claim 1, characterized in that, A PVD coating layer is provided on the inner surface of the portion, and the thickness of the PVD coating layer is 0.1μm~1.1μm.

5. The inner pot according to claim 4, characterized in that, The PVD coating layer satisfies at least one of the following conditions: The Vickers hardness of the PVD coating layer is greater than 1200 HV; and / or, The PVD coating layer is a metal film or a metal-ceramic film.

6. The inner pot according to claim 4, characterized in that, The gloss of at least a portion of the inner surface to which the PVD coating is applied is 30 GU to 40 GU, and / or, The roughness Ra of at least a portion of the inner surface to which the PVD coating is attached is 2.5 μm to 3.5 μm.

7. The inner pot according to claim 1, characterized in that, The material of the pot body is stainless steel; or The pot body includes a first metal layer, a heat-conducting layer and a second metal layer connected sequentially from the inside to the outside along its thickness direction. The inner surface is composed of the first metal layer, which is made of 304 stainless steel or 316 stainless steel.

8. The inner pot according to any one of claims 1 to 7, characterized in that, The inner surface of the portion refers to the inner surface of the bottom of the receiving cavity and the inner surface at the junction of the bottom side.

9. The inner pot according to claim 8, characterized in that, The inner surface of the bottom side connection refers to the portion of the inner surface of the cooking cavity where the angle between the tangent of the surface and the vertical plane perpendicular to the horizontal plane is equal to or greater than 30°.

10. A cooking utensil, characterized in that, The cooking appliance is equipped with a pot inner liner as described in any one of claims 1 to 9.

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