Pot container and cooking utensil

Abstract

The utility model discloses a pot container and a cooking utensil. The pot container comprises an outer pot base body, an inner pot base body and a local functional coating. The inner pot base body is located on the outer side of the outer pot base body to form a pot body with a containing cavity, and at least the inner pot base body is a heat conduction pot base body; the local functional coating is arranged on the surface of the outer pot base body or the inner pot base body, the local functional coating is discontinuously or continuously arranged to form at least one local functional area, and every two adjacent local functional areas or the adjacent part of a single local functional area is arranged in a spaced mode in at least one of the radial direction, the circumferential direction and the height direction of the pot body. A local temperature difference area is formed on the inner surface of the pot container. According to the utility model, when the pot liner is heated, the inner surface of the pot liner can generate an obvious temperature gradient. The temperature gradient is used for promoting heat convection in the pot to become fast and violent, so that liquid and food materials in the pot are boiled and turned over more sufficiently, the food materials are heated more uniformly, and the cooking effect consistency of food is better.

Description

Technical Field

[0001] This application relates to the technical field of kitchen appliances, and more specifically to a pot inner pot and a cooking utensil. Background Technology

[0002] Existing cooking appliances such as regular rice cookers, electric stoves, IH rice cookers, and induction cookers are generally equipped with a heatable inner pot. These inner pots are typically composed of single, double, or multiple layers of substrate, sometimes with a coating on the surface. However, regardless of the substrate or coating, the thickness of each layer is essentially the same throughout the inner pot. This results in a generally uniform thickness of the inner pot, leading to a smooth inner and outer surface and even heat conduction. When the inner pot is heated, the uniform heat transfer and temperature distribution across the inner surface at similar heights result in slow convection currents, limited convection zones, insufficient boiling and tumbling of food, and inconsistent cooking outcomes.

[0003] Therefore, a pot inner liner and cooking utensil are needed to at least partially solve the above problems. Utility Model Content

[0004] The description of this utility model introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This description 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, this utility model provides a pot inner liner for cooking utensils, the pot inner liner comprising:

[0006] Outer pot base;

[0007] An inner pot base, located outside the outer pot base to form a pot body with a receiving cavity, wherein at least the inner pot base is a heat-conducting pot base; and

[0008] A localized functional coating is applied to the surface of the outer pot substrate or the inner pot substrate, and the localized functional coating is arranged intermittently or continuously to form at least one localized functional area.

[0009] Wherein, two adjacent local functional areas or the adjacent portions of a single local functional area are arranged at least one of the radial, circumferential and height directions of the pot body to form a local temperature difference region on the inner surface of the pot liner.

[0010] According to this design, the inner surface of the pot's inner pot can have a first temperature zone corresponding to the localized functional areas formed by the localized functional coating, and a second temperature zone corresponding to the intervals within those localized functional areas. When the pot's inner pot is heated, due to the adjustment of heat distribution by the localized functional coating, there is a significant temperature difference between the first and second temperature zones, thus forming a localized temperature difference region between the two areas and generating a noticeable temperature gradient. This temperature gradient promotes faster and more intense heat convection within the pot, resulting in more thorough boiling and churning of the liquid and ingredients, more even heating of the ingredients, and better consistency in the cooking process.

[0011] Optionally, the outer pot substrate is a magnetically conductive pot substrate, and the local functional coating is a heat-concentrating coating, a heat-insulating coating, a magnetically concentrating coating, or a magnetically shielding coating.

[0012] According to this solution, for the inner pot of electromagnetic heating, the heat transfer path can be changed by using a heat-concentrating coating or a heat-insulating coating, or the magnetic field distribution can be changed by using a magnetic coating or a magnetic shielding coating, thereby adjusting the heat distribution to form the local temperature difference region.

[0013] Optionally, the outer pot substrate is a heat-conducting pot substrate, and the local functional coating is a heat-concentrating coating, a heat-insulating coating, or a magnetic coating.

[0014] According to this solution, for electrically heated pots, the heat transfer path can be changed by using a heat-retaining coating or a heat-insulating coating, or the magnetic field distribution can be changed by using a magnetic coating, thereby adjusting the heat distribution to form the local temperature difference zone.

[0015] Optionally, the local functional coating is a heat-retaining coating or a heat-insulating coating, and the local functional coating is disposed between the outer pot substrate and the inner pot substrate or on the inner surface of the inner pot substrate.

[0016] According to this solution, in the heat-retaining coating scheme, heat from the outer or inner pot substrate can be transferred from the outside to the inside and concentrated in the heat-retaining coating. The temperature of the heat-retaining coating is higher, resulting in a higher inner surface temperature of the corresponding area of ​​the pot liner. In the heat-insulating coating scheme, heat from the outer or inner pot substrate is blocked by the heat-insulating coating when it is transferred from the outside to the inside, resulting in a lower inner surface temperature of the corresponding area of ​​the pot liner.

[0017] Optionally, the local functional coating is a magnetic coating, which is disposed between the outer pot substrate and the inner pot substrate or on the outer surface of the outer pot substrate.

[0018] According to this scheme, some magnetic lines of force in the magnetic field can be concentrated on the magnetic coating. When the pot is heated electromagnetically, the magnetic coating can generate a large amount of heat, which is transferred from the outside to the inside, resulting in a higher inner surface temperature in the corresponding area of ​​the pot.

[0019] Alternatively, the local functional coating is a magnetic shielding coating, which is disposed on the outer surface of the outer pot substrate.

[0020] According to this solution, the magnetic shielding coating can prevent magnetic lines of force from passing through the magnetic shielding coating and the adjacent part of the magnetic pot base, thus preventing the part of the magnetic pot base from generating heat, thereby keeping the inner surface temperature of the corresponding area of ​​the pot body lower.

[0021] Optionally, the difference ΔW between the thermal conductivity of the heat-concentrating coating and the thermal conductivity of the heat-concentrating pot substrate is ΔW≥20W / (m·K); the thickness of the heat-concentrating coating is 0.1μm~0.5mm.

[0022] According to this scheme, the thermal conductivity of the heat-concentrating coating is significantly different from that of the heat-conducting pot substrate. The heat accumulated by the heat-concentrating coating can make the temperature gradient in the local temperature difference area more obvious, thus achieving a better heat convection effect.

[0023] Optionally, the outer pot substrate is a magnetically conductive pot substrate, and the localized functional coating is a magnetically concentrated coating, wherein the difference Δμ between the relative permeability of the magnetically concentrated coating and the relative permeability of the magnetically conductive pot substrate is... r For Δμ r ≥100; the thickness of the magnetic coating is 0.1μm~0.5mm.

[0024] According to this scheme, the magnetic permeability of the magnetic coating is significantly different from that of the magnetic pot substrate. The heat generated by the magnetic coating can make the temperature gradient in the local temperature difference area more obvious, thus achieving a better heat convection effect.

[0025] Optionally, the pot liner has a functional setting area for arranging the local functional coating, wherein the local functional coating is a heat-retaining coating or a magnetic-retaining coating and occupies 40% to 80% of the area in the functional setting area. Alternatively, the local functional coating is a heat-insulating coating or a magnetic shielding coating and occupies 10% to 50% of the area in the functional setting area.

[0026] According to this scheme, the area of ​​the heat-concentrating coating or magnetic coating is set to a larger proportion, while the area of ​​the heat-insulating coating or magnetic shielding coating is set to a smaller proportion, so that the heat of the pot body as a whole can meet the cooking needs while ensuring the overall heating effect and local convection effect.

[0027] Optionally, the localized functional coating is a heat-retaining coating or a magnetic coating, and there is a spacing s between two adjacent localized functional areas or between adjacent portions of a single localized functional area, the spacing s being 5mm to 85mm. The outer pot substrate and / or the inner pot substrate are made of metal. The localized functional coating is a heat-insulating coating or a magnetic shielding coating, and there is a spacing s between two self-spaced contour edges of the localized functional areas, the spacing s being 5mm to 85mm.

[0028] According to this solution, the inner surface of the pot can obtain a temperature gradient within the desired temperature range in the local temperature difference area, allowing the liquid and ingredients in the pot to tumble more thoroughly, which can meet the cooking needs and result in better consistency in the cooking effect of the food.

[0029] Optionally, the at least one local functional area includes a plurality of first local functional areas, the plurality of first local functional areas being arranged in a circumferential array along the pot body, and the width of each first local functional area in the circumferential direction gradually increasing from the radial direction outward and / or the height direction upward of the pot body.

[0030] According to this solution, multiple local functional areas, including fan-shaped and similar patterns, can be formed on the inner pot. Compared to other shapes such as rings, circles, and polygons, the local functional areas of the gradually widening pattern have the structural characteristic of being narrower closer to the bottom center of the inner pot and wider further away from the bottom center. This allows the local functional coating to cover a larger area of ​​the inner pot, at least at the bottom, and the local functional coating has a larger area for adjusting the heat distribution of the inner pot. This results in a larger coverage area for local temperature difference zones, achieving a wide-range, uneven heating and boiling effect. Furthermore, when the local functional coating is located on the inner or outer surface of the inner pot, the appearance of the product can be shaped based on the gradually widening pattern, making the overall appearance simpler, more aesthetically pleasing, and visually appealing.

[0031] Optionally, the at least one local functional area includes a second local functional area that is annular or circular, the second local functional area being located at the bottom center of the pot body, and the plurality of first local functional areas being connected to the second local functional area.

[0032] According to this solution, multiple first partial functional areas can be positioned based on the second partial functional area, making it easier for partial functional materials to be formed on the pot body; and the overall appearance of the product is simpler and more beautiful, with a better visual effect.

[0033] Optionally, the pot body includes a connected pot body bottom and a pot body side, at least the pot body bottom is configured in an arc or spherical shape, the local functional coating is at least provided on the pot body bottom, the projection of the local functional coating on the horizontal plane has a first maximum diameter D1, the pot body has a second maximum diameter D2 on the pot body side, wherein D1 / D2≥40%.

[0034] According to this design, the pot body exhibits uneven heating from the bottom to a certain height along its sides, allowing food in these areas to tumble fully and achieve uniform heating. When the local functional coating is a magnetic or heat-concentrating coating, the heating area is larger, reaching part of the sides, preventing undercooked food from forming and meeting the minimum standard for undercooked food, thus improving cooking results.

[0035] According to another aspect of this application, a cooking appliance is provided, the cooking appliance including a heating device and a pot as described in any of the above aspects, the heating device being used to heat the pot.

[0036] According to this solution, when the inner pot is heated, the inner pot with a localized functional coating can generate a significant temperature gradient on its inner surface. The temperature gradient promotes faster and more intense heat convection inside the pot, resulting in more thorough boiling and churning of the liquid and ingredients, more even heating of the ingredients, and better consistency in the cooking effect of the food.

[0037] Optionally, the heating device includes a bottom heating device located at the bottom of the pot and / or a side heating device located on the side of the pot, wherein a local functional coating of the pot is disposed in the projection area of ​​the bottom heating device and / or the side heating device on the pot.

[0038] According to this solution, the hot zone or magnetic field generated by the bottom heating device and / or the side heating device can completely cover the area with the local functional coating, so that the pot liner generates heat convection within the area covered by the hot zone or magnetic field, resulting in high heating efficiency and good uneven heating and boiling effect. Attached Figure Description

[0039] The following drawings, which are incorporated herein by reference as part of this invention, are provided for understanding the invention. The drawings illustrate embodiments of the invention and their descriptions, serving to explain the principles of the invention.

[0040] In the attached image:

[0041] Figure 1 This is a cross-sectional view of a pot inner chamber according to one embodiment of this application;

[0042] Figure 2 for Figure 1 Enlarged view of section A;

[0043] Figure 3 This is a cross-sectional view of a pot according to another embodiment of this application;

[0044] Figure 4 for Figure 3 Enlarged view of section B;

[0045] Figure 5 A cross-sectional view of the inner pot according to another embodiment of this application;

[0046] Figure 6 for Figure 5 Enlarged view of section C;

[0047] Figure 7 for Figure 1 A partial cross-sectional view of an example of the inner pot shown, wherein the partial functional coating is a magnetic coating;

[0048] Figure 8 for Figure 1 A partial cross-sectional view of another example of the pot liner shown, wherein the partial functional coating is a magnetic shielding coating;

[0049] Figure 9 for Figure 3 A partial cross-sectional view of an example of a pot liner is shown, wherein the local functional coating is a heat-reducing coating or a magnetic coating;

[0050] Figure 10 for Figure 3 A partial cross-sectional view of an example of a pot liner is shown, where the partial functional coating is a heat-insulating coating;

[0051] Figure 11 for Figure 5 A partial cross-sectional view of an example of a pot liner is shown, wherein the local functional coating is a heat-reducing coating or a magnetic coating;

[0052] Figure 12 for Figure 5 A partial cross-sectional view of an example of a pot liner is shown, where the partial functional coating is a heat-insulating coating;

[0053] Figure 13 for Figure 1 The diagram shows a partial cross-sectional view of the inner pot, with diameters D1 and D2 shown.

[0054] Figure 14a for Figure 1 The bottom view of the inner pot shown;

[0055] Figure 14b for Figure 1 A bottom view of a modified example of the inner pot shown;

[0056] Figure 15 for Figure 14a Another bottom view of the inner pot is shown, in which the function setting area is schematically shown with shaded lines;

[0057] Figure 16 The image of the heated inner pot of this utility model is captured by a thermal imager.

[0058] Explanation of reference numerals in the attached figures:

[0059] 1 pot inner pot

[0060] 10 pot body

[0061] 11 Outer pot base

[0062] 12 Inner Pot Base

[0063] 13 Bottom of the pot body

[0064] 14. Side of the pot body

[0065] 15 containment chambers

[0066] 20 Localized Functional Coatings

[0067] 20a magnetic coating

[0068] 20b magnetic shielding coating

[0069] 20C thermal coating

[0070] 20d heat insulation coating

[0071] S1 Local Functional Area

[0072] S11 First Partial Functional Area

[0073] S12 Second Local Functional Area

[0074] S2 Interval Zone

[0075] S31 Function Setting Area

[0076] S32 Non-functional Setting Area Detailed Implementation

[0077] 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 the present invention can 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 the present invention.

[0078] To fully understand this invention, a detailed description will be provided below. Obviously, the implementation of this invention is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of this invention are described in detail below; however, other embodiments may also be possible besides these detailed descriptions.

[0079] 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.

[0080] The ordinal numbers such as "first" and "second" used in this invention are merely identifiers and have no other meaning, such as a specific order. Furthermore, 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."

[0081] It should be noted that the terms “up,” “down,” “front,” “back,” “left,” “right,” “inner,” “outer,” and similar expressions used in this article are for illustrative purposes only and are not intended to be restrictive.

[0082] 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.

[0083] This utility model provides a cooking appliance, which includes a pot and a heating device for heating the pot. The cooking appliance can be, for example, a regular rice cooker, an electric stove equipped with a pot, a pressure cooker, or other electrically heated cooking appliances, in which case the heating device is an electric heating plate or similar device. Alternatively, the cooking appliance can be, for example, an IH rice cooker, an induction cooker equipped with a pot, an IH pressure cooker, or other electromagnetically heated cooking appliances, in which case the pot includes a magnetically conductive material, and the heating device is an electromagnetic heating coil or similar device. In addition to cooking rice, the cooking appliance can also have various other functions such as cooking porridge.

[0084] For cooking appliances like rice cookers, the cooking vessel consists of a pot body and a lid. The pot body has a cylindrical inner pot storage compartment. The inner pot can be fixed in the inner pot storage compartment, or it can be freely placed into or removed from the inner pot storage compartment for easy cleaning. The inner pot is usually made of metal and has a circular opening on its upper surface for holding the food to be heated, such as rice or soup. The pot body includes an electromagnetic heating device, such as an electromagnetic coil, for heating the inner pot.

[0085] The lid has a shape that substantially corresponds to the pot body. The lid is cladably mounted on the pot body; specifically, it is pivotally connected to the pot body via a pivot axis and can freely pivot between a closed and open position relative to the pot body about the pivot axis, facilitating the closing and opening of the pot body. When the lid is closed on the pot body, it covers the inner pot, forming a cooking space between them. The lid typically also has a sealing ring, which can be made of, for example, rubber, and is positioned between the lid and the inner pot to seal the cooking space when the lid is closed.

[0086] For cooking appliances such as electric stoves or induction cookers, the inner pot is independent of the electric stove or induction cooker, and the inner pot can be placed on the upper surface of the electric stove or induction cooker during use.

[0087] like Figures 1 to 6 As shown, this application provides a pot liner 1 with improved heat convection. The pot liner 1 mainly includes an outer pot substrate 11, an inner pot substrate 12, and a localized functional coating 20. The inner pot substrate 12 is located outside the outer pot substrate 11 to form a pot body 10 with a receiving cavity 15. That is, the pot body 10 is constructed with a double-layered pot substrate and includes an outer pot substrate 11 and an inner pot substrate 12. The localized functional coating 20 is used to adjust the heat distribution of the pot liner 1. At least the inner pot substrate 12 is a heat-conducting pot substrate. The localized functional coating 20 can be provided on the surface of the outer pot substrate 11 and / or the inner pot substrate 12, for example, the functional coating can be formed on the surface of the outer pot substrate 11 and / or the inner pot substrate 12 by means of coating or printing.

[0088] To improve heat convection within the inner pot 1 during cooking, the localized functional coating 20 is arranged intermittently or continuously to form at least one localized functional area S1. Two adjacent localized functional areas S1 (see...) Figure 14b ) or the portion adjacent to a single local functional area S1 itself (see Figure 14a The coatings 20 are arranged at least once in one of the radial, circumferential, and height directions of the pot body 10 to form localized temperature difference regions on the inner surface of the pot liner 1. The pot body 10 includes a connected pot body bottom 13 and pot body side 14. At least the pot body bottom 13 is configured in an arcuate or spherical shape, and the localized functional coating 20 is provided at least on the pot body bottom 13. Figure 1 , Figure 3 and Figure 5 The diagram schematically shows an arc-shaped pot bottom 13 and a straight-walled pot side 14. In one example (not shown), the pot bottom 13 and pot side 14 form a spherical shape. In another example (not shown), the pot bottom 13 and pot side 14 form a straight-walled shape.

[0089] When the local functional coating 20 is disposed on the bottom of the pot body 10, for the bottom of the pot body 13 with straight walls, the local functional areas S1 are arranged at least once in the radial and circumferential directions of the pot body 10; for the bottom of the pot body 13 with arcuate / spherical shapes, the local functional areas S1 are arranged at intervals in the circumferential direction, or in the radial and height directions, or in the radial, circumferential and height directions of the pot body 10.

[0090] When the local functional coating 20 is provided on the side of the pot body 10, for the straight-walled pot body side 14, the local functional areas S1 are arranged at least once in the circumferential and height directions of the pot body 10; for the arc-shaped / spherical pot body side 14, the local functional areas S1 are arranged at intervals in the circumferential, radial and height directions, or radial, circumferential and height directions of the pot body 10.

[0091] With this arrangement, the inner surface of the pot liner 1 can have a first temperature zone corresponding to the local functional area S1 formed by the local functional coating 20 and a spacer area S2 corresponding to the local functional area S1 (see...). Figure 14a and Figure 14b The second temperature zone of the inner pot 1. When the inner pot 1 is heated, due to the adjustment of heat distribution by the local functional coating 20, there is a significant temperature difference between the first and second temperature zones of the inner pot 1. This creates a local temperature difference zone between the two zones, resulting in a significant temperature gradient. This temperature gradient accelerates and intensifies heat convection within the pot, allowing the liquid and ingredients to boil and churn more thoroughly, resulting in more even heating of the ingredients and better consistency in cooking. Furthermore, when local temperature difference zones exist at multiple locations on the inner surface of the inner pot 1, the expansion of food grains such as rice in contact with the inner surface causes stress deformation and changes in viscosity, giving the inner surface of the inner pot 1 non-stick properties, achieving a non-stick coating-free process.

[0092] This design uses a coating to form localized functional areas. Compared to individual functional components, the coating is easier to integrate with the pot substrate, facilitating the production of the inner pot and reducing manufacturing and material costs. Furthermore, the coating can present visually striking colors, such as red and green. When the coating is located on the inner or outer side of the inner pot, it can better showcase the location and shape of the localized functional areas, making the product more aesthetically pleasing and visually appealing. Additionally, the coating can be color-changing, altering its color with temperature, for example, appearing green at lower temperatures and red at higher temperatures, allowing consumers to easily determine the temperature of the inner pot.

[0093] In some embodiments, the localized functional coating 20 is used to alter the distribution of the magnetic field, thereby adjusting the heat distribution. For example... Figure 1 and Figure 2As shown, the outer pot substrate 11 is a magnetically conductive pot substrate, the inner pot substrate 12 is a heat-conducting pot substrate, and the local functional coating 20 is either a magnetically concentrated coating 20a or a magnetically shielding coating 20b. Using the magnetically concentrated coating 20a, some magnetic field lines in the magnetic field can be concentrated on the magnetically concentrated coating 20a. When the inner pot 1 is electromagnetically heated, the magnetically concentrated coating 20a and the adjacent portion of the magnetically conductive pot substrate generate a large amount of heat. This heat is transferred from the outside to the inside, resulting in a higher inner surface temperature in the corresponding area of ​​the inner pot 1. Further, the first temperature zone is a high-temperature zone, and the second temperature zone is a low-temperature zone. The magnetically shielding coating 20b can prevent magnetic field lines from passing through the magnetically shielding coating 20b and the adjacent portion of the magnetically conductive pot substrate, preventing that portion of the magnetically conductive pot substrate from generating heat. Therefore, the inner surface temperature in the corresponding area of ​​the inner pot 1 is lower. Further, the first temperature zone is a low-temperature zone, and the second temperature zone is a high-temperature zone.

[0094] As shown in the example, a localized functional coating 20 is disposed on the outer surface of the outer pot substrate 11. In this case, the localized functional coating 20 is either a magnetically focused coating 20a or a magnetically shielding coating 20b. The heat generated by the outer magnetically focused coating 20a is transferred inward through the outer pot substrate 11 and the inner pot substrate 12; the magnetically shielding coating 20b provides significant shielding when located on the outer side of the magnetically conductive pot substrate. Alternatively, the localized functional coating 20 is disposed between the outer pot substrate 11 and the inner pot substrate 12. In this case, the localized functional coating 20 is a magnetically focused coating 20a. The heat generated by the intermediate magnetically focused coating 20a is transferred inward through the inner pot substrate 12.

[0095] In some embodiments, the localized functional coating 20 is used to alter the heat transfer path, thereby adjusting the heat distribution. For example... Figures 3 to 6 As shown, the outer pot substrate 11 is a magnetically conductive pot substrate or a heat-conducting pot substrate, the inner pot substrate 12 is a heat-conducting pot substrate, and the local functional coating 20 is a heat-concentrating coating 20c or a heat-insulating coating 20d. Using the heat-concentrating coating 20c, heat is transferred from the outside to the inside towards the heat-concentrating coating 20c, rather than from the outside to the inside along the thickness direction. This causes the heat from the outer pot substrate 11 or the inner pot substrate 12 to be concentrated in the heat-concentrating coating 20c. The temperature of the heat-concentrating coating 20c is higher, resulting in a higher inner surface temperature in the corresponding area of ​​the inner pot 1. In other words, the first temperature zone is a high-temperature zone, and the second temperature zone is a low-temperature zone. Using the heat-insulating coating 20d, the path of heat transfer from the outside to the inside along the thickness direction is blocked by the heat-insulating coating 20d. The heat from the outer pot substrate 11 or the inner pot substrate 12 cannot be transferred inward through the heat-insulating coating 20d, resulting in a lower inner surface temperature in the corresponding area of ​​the inner pot 1. In other words, the first temperature zone is a low-temperature zone, and the second temperature zone is a high-temperature zone.

[0096] Figure 3 and Figure 4A localized functional coating 20 is shown disposed between the outer pot substrate 11 and the inner pot substrate 12. In this case, the localized functional coating 20 is either a heat-retaining coating 20c or a heat-insulating coating 20d. The intermediate heat-retaining coating 20c can concentrate the heat of the outer pot substrate 11, while the intermediate heat-insulating coating 20d can block the heat of the outer pot substrate 11. Figure 5 and Figure 6 A localized functional coating 20 is shown disposed on the inner surface of the inner pot substrate 12. In this case, the localized functional coating 20 is either a heat-retaining coating 20c or a heat-insulating coating 20d. The heat-retaining coating 20c on the inner side can concentrate the heat of the inner pot substrate 12, while the heat-insulating coating 20d on the inner side can block the heat of the inner pot substrate 12.

[0097] In some embodiments, the outer pot base 11 is made of a thermally conductive metal material to form a heat-conducting pot base; or it is made of a magnetically conductive metal material. The inner pot base 12 is made of a thermally conductive metal material to form a heat-conducting pot base. Alternatively, the outer pot base 11 and the inner pot base 12 are made of non-metallic materials. With the double-layered pot base, the inner pot base 12 can be made of a non-stick metal material to give the inner surface of the inner pot 1 a non-stick function, achieving coating-free non-stick; the outer pot base 11 is used to generate heat or absorb heat from the heating device via electromagnetic heating; and the inner pot 1 has better heat storage and insulation performance. Exemplarily, the inner pot base 12 can be made of stainless steel, titanium, or ceramic.

[0098] For example, when the local functional coating 20 is a magnetically concentrated coating 20a, the material of the magnetically concentrated coating 20a can be a known material such as rare earth material or amorphous material. The thickness of the magnetically concentrated coating 20a can be 0.1 μm to 0.5 mm, for example, suitable values ​​such as 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 0.1 mm, 0.5 mm, etc., preferably 30 μm. When the local functional coating 20 is a magnetically shielding coating 20b, the material of the magnetically shielding coating 20b can be a known material such as aluminum powder or ceramic. The thickness of the magnetically shielding coating 20b can be 0.1 μm to 1 mm, for example, 0.1 μm, 0.5 μm, 1 μm, etc.

[0099] Suitable values ​​include 5μm, 10μm, 50μm, 0.1mm, 0.5mm, and 1mm, with 0.3mm being the preferred value.

[0100] For example, when the local functional coating 20 is a thermally insulating coating 20c, the material of the thermally insulating coating 20c can be known materials such as metal-based pure copper, metal-based diamond / copper composite material, metal-based nano-alumina-carbon nanotube composite material, metal-based graphene composite material, composite silicon carbide (SiC), aluminum nitride, or boron nitride. Alternatively, the thermally insulating coating 20c can be a DLC coating. The thickness of the thermally insulating coating 20c can be 0.1 μm to 0.5 mm, for example, suitable values ​​such as 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 0.1 mm, and 0.5 mm, preferably 30 μm. When the local functional coating 20 is a thermally insulating coating 20d, the material of the thermally insulating coating 20d can be known materials such as PTFE (polytetrafluoroethylene), PFA (polyfluoroalkoxy), or ceramics. The thickness of the heat-insulating coating over 20 days can range from 0.1 μm to 1 mm, for example, 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm.

[0101] Suitable values ​​include 0.1mm, 0.5mm, and 1mm, with 80μm being the preferred value.

[0102] When the outer pot substrate 11 is a magnetically conductive pot substrate and the local functional coating 20 is a magnetically concentrated coating 20a, the relative permeability of the magnetically concentrated coating 20a is greater than that of the magnetically conductive pot substrate. To make the temperature gradient in the local temperature difference region more obvious, the difference Δμ between the relative permeability of the magnetically concentrated coating 20a and the relative permeability of the magnetically conductive pot substrate is increased. r It can be Δμ r ≥100; difference Δμ r For example, suitable values ​​could be 100, 110, 120, 130, 140, 150, 160, 170, 180, or 190. With this setting, a temperature difference of over 25°C can be formed on the inner surface of the inner pot 1, which is beneficial for the liquid and food inside the pot to boil and tumble more thoroughly.

[0103] When the outer pot substrate 11 is a heat-conducting pot substrate and the local functional coating 20 is a heat-retaining coating 20c, the difference ΔW between the thermal conductivity of the heat-retaining coating 20c and the thermal conductivity of the heat-conducting pot substrate can be ΔW ≥ 20 W / (m·K); the difference ΔW can be, for example, 20 W / (m·K), 30 W / (m·K), 40 W / (m·K), 50 W / (m·K), 60 W / (m·K), 70 W / (m·K), 90 W / (m·K), etc. With this setting, a temperature difference of more than 25°C can be formed on the inner surface of the inner pot 1, which is conducive to more thorough boiling and tumbling of the liquid and food in the pot.

[0104] To create the desired temperature gradient, when the local functional coating 20 is a thermally insulating coating 20c or a magnetically insulating coating 20a, there is a spacing s between two adjacent local functional regions S1 or between adjacent portions of a single local functional region S1 (see [link]). Figure 14a and Figure 14b When the local functional coating 20 is a heat-insulating coating 20d or a magnetic shielding coating 20b, the local functional area S1 has a spacing s between its two self-spaced contour edges. Specifically, in the illustrated example, the spacing s is equivalent to the circumferential width of the fan-shaped functional area. It should be noted that the spacing refers to the spacing on the plane or curved surface of the pot body 10; for example, for a pot body 1 with at least a straight wall at the bottom, the spacing refers to the spacing on the plane of the pot body; for a pot body 1 with at least a curved / spherical bottom, the spacing refers to the spacing on the curved surface of the pot body.

[0105] Figure 7 The diagram shows an outer pot substrate 11 that can be either a heat-conducting or magnetically conductive pot substrate, an inner pot substrate 12 that can also be a heat-conducting pot substrate, and a localized functional coating 20 that is a magnetically concentrated coating 20a located on the outer surface of the outer pot substrate 11. When the inner pot 1 is heated, a high-temperature point T1 is generated at the edge of the magnetically concentrated coating 20a. After heat conduction, a high-temperature point T2 and a low-temperature point T3 are generated on the inner surface of the inner pot 1. The high-temperature point T2 corresponds to the high-temperature point T1 in the thickness direction, and the low-temperature point T3 corresponds to the middle of the section cut off by the interval S2. The heat transfer distance between the high-temperature points T1 and T2 is L1, and the heat transfer distance between the high-temperature point T1 and the low-temperature point T3 is L2. Therefore, T1 > T2 > T3. After a temperature difference is generated on the inner surface of the inner pot, heat flows from the high-temperature area to the low-temperature area, promoting the tumbling and convection of the food inside the pot, resulting in even cooking.

[0106] The spacing s is the distance between the local functional areas S1 formed by the magnetic coating 20a. A test was conducted using an example pot liner 1 from this application, and the relationship between temperature difference and spacing s was obtained, as shown in Table 1.

[0107]

[0108] Therefore, as the spacing s increases, the temperature difference between the high-temperature point T2 and the low-temperature point T3 also increases. If the spacing is too small, the temperature difference is too small, the rice's tumbling force is too weak, and the moisture content of the cooked rice is uneven. If the spacing is too large, the temperature difference is too large, the temperature in the low-temperature zone is too low, and the rice is prone to being undercooked in the low-temperature zone. At the same time, because the area of ​​the temperature difference zone is smaller with a larger spacing, the tumbling will also be uneven. Therefore, the spacing s is set to 5mm to 85mm, for example, 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 85mm, etc.; preferably 10mm to 60mm.

[0109] Figure 8 The diagram shows an outer pot substrate 11 as a magnetically conductive pot substrate, an inner pot substrate 12 as a heat-conducting pot substrate, and a localized functional coating 20, which is a magnetically shielding coating 20b, located on the outer surface of the outer pot substrate 11. A high-temperature point T1 is located near the edge of the magnetically shielding coating 20b on the outer pot substrate 11, a high-temperature point T2 corresponds to the position of high-temperature point T1 in the thickness direction, and a low-temperature point T3 corresponds to the middle of the section cut off by the magnetically shielding coating 20b. In this design, T1 > T2 > T3; the spacing s is set to 5mm to 85mm, preferably 10mm to 60mm.

[0110] Figure 9 The diagram shows an outer pot substrate 11 that is either a heat-conducting or magnetically conductive pot substrate, an inner pot substrate 12 that is also a heat-conducting pot substrate, and a localized functional coating 20 that is a heat-retaining coating 20c located between the outer pot substrate 11 and the inner pot substrate 12. A high-temperature point T1 is located at the edge of the heat-retaining coating 20c, a high-temperature point T2 corresponds to the position of high-temperature point T1 in the thickness direction, and a low-temperature point T3 corresponds to the middle of the portion cut off by the interval S2. In this design, T1 > T2 > T3; the spacing s is set to 5mm to 85mm, preferably 10mm to 60mm.

[0111] Figure 10 The diagram shows an outer pot substrate 11 that is either a heat-conducting or magnetically conductive pot substrate, an inner pot substrate 12 that is also a heat-conducting pot substrate, and a localized functional coating 20 that is a heat-insulating coating 20d located between the outer pot substrate 11 and the inner pot substrate 12. A high-temperature point T1 is located near the edge of the magnetically shielding coating 20b on the inner pot substrate 12, a high-temperature point T2 corresponds to the high-temperature point T1 in the thickness direction, and a low-temperature point T3 corresponds to the middle of the section cut off by the heat-insulating coating 20d. In this design, T1 > T2 > T3; the spacing s is set to 5mm to 85mm, preferably 10mm to 60mm.

[0112] Figure 11 The diagram shows an outer pot substrate 11 that is either a heat-conducting or magnetically conductive pot substrate, an inner pot substrate 12 that is also a heat-conducting pot substrate, and a localized functional coating 20 that is a heat-retaining coating 20c located on the inner surface of the inner pot substrate 12. A high-temperature point T1 is located at the edge of the heat-retaining coating 20c, a high-temperature point T2 corresponds to the position of high-temperature point T1 in the thickness direction, and a low-temperature point T3 corresponds to the middle of the portion cut off by the interval S2. In this design, T1 > T2 > T3; the spacing s is set to 5mm to 85mm, preferably 10mm to 60mm.

[0113] Figure 12The diagram shows an outer pot substrate 11 that is either a heat-conducting or magnetically conductive pot substrate, an inner pot substrate 12 that is also a heat-conducting pot substrate, and a localized functional coating 20 that is a heat-insulating coating 20d located on the inner surface of the inner pot substrate 12. A high-temperature point T1 is located near the edge of the magnetically shielding coating 20b on the inner pot substrate 12, a high-temperature point T2 corresponds to the high-temperature point T1 in the thickness direction, and a low-temperature point T3 corresponds to the middle of the section cut off by the heat-insulating coating 20d. In this design, T1 > T2 > T3; the spacing s is set to 5mm to 85mm, preferably 10mm to 60mm.

[0114] As described above, at least the bottom 13 of the pot body is constructed in an arc or spherical shape, and the localized functional coating 20 is at least provided on the bottom 13 of the pot body. Figure 13 As shown, the projection of the local functional coating 20 onto the horizontal plane has a first maximum diameter D1, and the pot body 10 has a second maximum diameter D2 on the side 14 of the pot body, where D1 / D2 ≥ 40%. For example, D1 / D2 can be 40%, 50%, 60%, 70%, 80%, 90%, 95%, etc., preferably 88%. Thus, the pot body 10 has a non-uniform heating effect from the bottom to a certain height on the side, allowing the food in this part of the side to tumble fully, achieving uniform heating. When the local functional coating 20 is a magnetic coating 20a or a heat-concentrating coating 20c, a D1 / D2 less than 40% will result in insufficient heating of the food on the side of the inner pot, leading to severely undercooked food that does not meet the minimum standard for undercooked food. A D1 / D2 greater than or equal to 40% results in a larger heating area that reaches part of the side, preventing undercooked food on the side, meeting the minimum standard for undercooked food, and improving the cooking effect. An optimal state is achieved when D1 / D2 is 88%.

[0115] The shape of the local functional coating 20 can be arranged as needed: one example is that the local functional coating 20 is arranged in a ring, specifically in a ring along the circumference of the pot body 10, and in a concentric ring array along the radial direction of the pot body 10 and / or in a row along the height direction of the inner pot 1. Another example is that the local functional coating 20 is arranged in a spiral shape, specifically spiraling outward radially from the bottom center of the pot body 10 and spiraling upward along the height direction.

[0116] like Figure 14a and Figure 14b As shown, the local functional coating 20 forms a plurality of first local functional areas S11, which are arranged in a circumferential array along the pot body 10. The shape of the first local functional areas S11 can be circular, elliptical, etc. Figure 14a and Figure 14bThe first local functional area S11 is shown to be fan-shaped or similar. Specifically, the width of each local functional area S1 in the circumferential direction gradually increases from the radial direction outward and / or the height direction upward of the pot body 10, forming a gradually widening pattern. Compared with other shapes such as rings, circles, and polygons, the gradually widening local functional area S1 has the structural characteristics of being narrower closer to the bottom center of the pot 1 and wider further away from the bottom center of the pot 1. This allows the local functional coating 20 to cover more of the pot 1 area at least at the bottom, and the local functional coating 20 has a larger adjustment area for the heat distribution of the pot 1, thus covering a larger area of ​​local temperature difference regions and achieving a large-scale non-uniform heating and boiling effect. Furthermore, when the local functional coating 20 is located on the inner or outer surface of the pot body 10, the appearance of the product can be shaped based on the gradually widening pattern, making the overall appearance simpler and more beautiful, with a better visual effect.

[0117] At least one local functional area S1 further includes a ring-shaped or circular second local functional area S12. The second local functional area S12 is located at the bottom center of the pot body 10, and multiple first local functional areas S11 are connected to the second local functional area S12. Multiple first local functional areas S11 can be positioned based on the second local functional area S12, making it easier for the local functional material to be formed on the pot body 10; and the overall appearance of the product is simpler and more aesthetically pleasing, with a better visual effect. Optionally, when the magnetic coating 20a or the magnetic shielding coating 20b is located on the outer surface of the pot body 10, the second local functional area S12 is set in a ring shape, so that the temperature measuring device contacts the outer surface of the pot body 10, ensuring more accurate temperature measurement and avoiding the influence of excessive or insufficient heat from the local functional coating 20 on the accuracy of temperature measurement.

[0118] By rationally setting the area ratio of the local functional coating 20, the overall heat of the pot liner 1 can meet the cooking requirements while ensuring both overall heating effect and local convection effect. Specifically, the pot liner 1 has a functional setting area S31 for arranging the local functional coating 20, see [link to relevant documentation]. Figure 15 The function setting area S31 is bounded by the horizontal reference plane where the highest point of the local functional coating 20 is located in the height direction, P. Figure 15 The approximate location of boundary P is schematically shown using dashed lines. The area below boundary P is the functional setting area S31, and the area above boundary P is the non-functional setting area S32. When the local functional coating 20 is a heat-concentrating coating 20c or a magnetic coating 20a, the area ratio of the local functional coating 20 in the functional setting area S31 is 40% to 80%, for example, the area ratio can be 40%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc., preferably 55%. If the area ratio of the heat-concentrating coating 20c or the magnetic coating 20a is too large, the temperature difference in the gap area will be too small, and the convection effect will be reduced; if the area ratio is too small, the thermal efficiency will be insufficient.

[0119] When the local functional coating 20 is a heat-insulating coating 20d or a magnetic shielding coating 20b, the area ratio of the local functional coating 20 in the functional setting area S31 is 10% to 50%, for example, the area ratio can be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc., preferably 40%. If the area ratio of the heat-insulating coating 20d or the magnetic shielding coating 20b is too large, the heat transfer will be slower, the thermal efficiency will be low, and the cooking time will be longer. If the area ratio is too small, the temperature difference will be small, and the large-scale tumbling effect will not be achieved.

[0120] Optionally, for cooking appliances such as rice cookers, the function setting area S31 can be defined based on the projection area of ​​the bottom heating device on the inner pot 1, whereby the projection area is the function setting area S31. The bottom heating device can be a coil / heating plate, and the projection area has its outermost boundary as the vertical projection of the outermost contour of the coil / heating plate onto the outer surface of the inner pot 1. The local functional coating 20 can be disposed within the projection area of ​​the bottom heating device on the inner pot 1. The heating device also includes a side heating device located on the side of the inner pot 1, and the local functional coating 20 is disposed within the projection area of ​​the side heating device on the inner pot 1.

[0121] To verify the temperature difference effect, an infrared thermography test was conducted on the inner pot 1 of this embodiment. The inner pot used a fan-shaped localized functional coating 20, as illustrated in the figure, with four fan-shaped localized functional areas. The inner pot was heated to, for example, 1200W for 10 seconds, and then the internal temperature was measured using a thermal imager. The test results are shown in [reference needed]. Figure 16 . Figure 16 Four fan-shaped temperature zones are shown, with the highest temperature reaching 51.9°C at the highest point in each zone, and the temperature at other locations being, for example, 37.2°C. It is evident that the heat in the pot of this embodiment is more concentrated, the temperature difference is greater, and the heat convection is more intense.

[0122] 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. Features 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.

[0123] This utility model has been described through the above embodiments. However, it should be understood that the above embodiments are only for illustrative purposes. This utility model is not limited to the above embodiments. Many 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 canister for use in a cooking appliance, characterized in that, The pot liner comprises: an outer pot base; an inner pot base located outside the outer pot base to form a pot body with a receiving cavity, at least the inner pot base being a heat-conductive pot base; and a local functional coating arranged on the surface of the outer pot base or the inner pot base, the local functional coating being arranged discontinuously or continuously to form at least one local functional area, wherein two adjacent local functional areas or portions of a single local functional area adjacent to each other are arranged at intervals in at least one of the radial, circumferential and height directions of the pot body to form a local temperature difference area on the inner surface of the pot liner.

2. The liner according to claim 1, characterized in that The outer pot base is a magnetically conductive pot base, and the local functional coating is a heat-concentrating coating, a heat-insulating coating, a magnetic-concentrating coating or a magnetic shielding coating.

3. The liner according to claim 1, wherein The outer pot base is a heat-conductive pot base, and the local functional coating is a heat-concentrating coating, a heat-insulating coating or a magnetic-concentrating coating.

4. The liner according to claim 1, wherein The local functional coating is a heat-concentrating coating or a heat-insulating coating, and is arranged between the outer pot base and the inner pot base or on the inner surface of the inner pot base.

5. The pot liner according to claim 1, wherein The local functional coating is a magnetic-concentrating coating, and is arranged between the outer pot base and the inner pot base or on the outer surface of the outer pot base; or The outer pot base is a magnetically conductive pot base, and the local functional coating is a magnetic shielding coating, and is arranged on the outer surface of the outer pot base.

6. The canister according to claim 1, wherein The local functional coating is a heat-concentrating coating, wherein the difference ΔW between the thermal conductivity of the heat-concentrating coating and the thermal conductivity of the heat-conductive pot base is ΔW≥20 W / (m·K); and / or The thickness of the heat-concentrating coating is 0.1 μm-0.5 mm.

7. The canister according to claim 1, wherein The outer pot base is a magnetically conductive pot base, and the local functional coating is a magnetic-concentrating coating, wherein the difference Δμ between the relative magnetic permeability of the magnetic attraction coating and the relative magnetic permeability of the magnetic conductive pot base r is Δμ r ≥ 100; and / or The thickness of the magnetic-concentrating coating is 0.1 μm-0.5 mm.

8. The canister according to any one of claims 1 to 7, characterized in that The pot liner has a functional setting area for arranging the local functional coating, wherein the local functional coating is a heat-concentrating coating or a magnetic-concentrating coating and the area ratio in the functional setting area is 40%-80%; and / or The local functional coating is a heat-insulating coating or a magnetic shielding coating and the area ratio in the functional setting area is 10%-50%.

9. The pot liner according to any one of claims 1-7, wherein The local functional coating is a heat-concentrating coating or a magnetic-concentrating coating, and the distance s between two adjacent local functional areas or portions of a single local functional area adjacent to each other is 5 mm-85 mm; or The local functional coating is a heat-insulating coating or a magnetic shielding coating, and the distance s between two profile edges of the local functional area spaced apart from each other is 5 mm-85 mm.

10. The canister according to any one of claims 1 to 7, characterized in that The at least one local functional area comprises a plurality of first local functional areas, the plurality of first local functional areas are arranged in an array along the circumferential direction of the pot body, and the width of each first local functional area in the circumferential direction gradually increases radially outward and / or upward in the height direction of the pot body.

11. The canister according to claim 10, wherein The at least one local functional area comprises a second local functional area in the shape of a ring or a circle, which is located in the middle of the bottom of the pot body, and the first local functional areas are connected to the second local functional area.

12. The canister according to any one of claims 1 to 7, characterized in that The pot body comprises a pot body bottom and a pot body side connected to each other, at least the pot body bottom is configured in the shape of an arc or a sphere, the local functional coating is provided at least on the pot body bottom, a projection of the local functional coating on a horizontal plane has a first maximum diameter D1, the pot body has a second maximum diameter D2 at the pot body side, and D1 / D2≥40%.

13. A cooking appliance characterized by, The cooking appliance comprises a heating device for heating the pot liner and the pot liner according to any one of claims 1 to 12.

14. The cooking appliance of claim 13, wherein, The heating device comprises a bottom heating device located at the bottom of the pot liner and / or a side heating device located at the side of the pot liner, and the local functional coating of the pot liner is arranged in the projection area of the bottom heating device and / or the side heating device on the pot liner.

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