Electric food warmer easy to clean

Abstract

The invention discloses an easy-to-clean electric food warmer which comprises a warmer body, a warmer liner and a warmer cover, the warmer liner is placed in the warmer body, a heating device for heating the warmer liner is further arranged in the warmer body, a boiling assisting array is arranged on the inner wall of the warmer liner and comprises a plurality of independent grooves for generating microbubbles, and a connecting part is formed between every two adjacent grooves through a metal inner wall; the boiling assisting array comprises a first boiling assisting array located on the bottom wall of the pot container and a second boiling assisting array located on the side wall of the pot container, and the density of grooves of the first boiling assisting array is not smaller than that of grooves of the second boiling assisting array; the pot body further comprises a cooling fan and an air outlet channel corresponding to the cooling fan, and the air outlet channel is arranged towards the pot container. According to the invention, the boiling is more uniform in the cooking process, and the coating-free and non-sticky effects are realized.

Description

[0001] This application is a divisional application of the application with application number CN202310115825.7 filed on February 14, 2023, and invention name “A method for making an easy-to-clean electric hot pot and an easy-to-clean electric hot pot pot core”. Technical Field

[0002] The invention belongs to the field of household appliances, and in particular relates to an easy-to-clean electric hot pot. Background Art

[0003] Electric cookers, such as rice cookers, typically consist of a pot body and a lid. The pot body is equipped with a pot core and a heating device, such as a heating plate or an IH coil. The pot core is typically made of metal. When powered on, the heating device transfers heat to the pot core, allowing the rice in the pot to be cooked. However, electric cookers can sometimes stick to the pot during cooking, making it difficult to clean the pot after eating, which can negatively impact the user experience. Several solutions exist to address this issue:

[0004] One method is to provide a non-stick coating on the inner wall of the pot, but the non-stick coating is prone to falling off during long-term cooking, especially in high-temperature cooking and dry-burning conditions. The non-stick coating is more likely to fall off, affecting its anti-stick effect and causing certain impacts on human health. In this regard, the prior art also provides grooves on the inner wall surface of the pot, and only provides the non-stick coating in the grooves, in order to reduce the use area of the coating and minimize the probability of the coating falling off due to factors such as scratching. However, the coating of this solution still has the risk of falling off.

[0005] One type is to make the surface of the cookware into a non-smooth surface with raised units, and disclose that the raised units can be replaced with pits. However, in the process of realizing this invention, the applicant found that the bubbles generated during the heating process of this solution are relatively uncontrollable, the bubbles vary in size and are mainly concentrated on the bottom wall of the pot, resulting in uneven boiling during the cooking process, resulting in different tastes between the upper and lower parts of the rice.

[0006] The other category is the moist film 0 coating technology that the applicant has previously applied for. On this basis, the applicant continued to study and produced the technical solution of the present invention, which further improved the uniformity of boiling during the cooking process and the flatness of the rice. Summary of the Invention

[0007] The present invention provides an easy-to-clean electric hot pot to solve at least one of the above technical problems.

[0008] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0009] The invention relates to an easy-to-clean electric hot pot, comprising a pot body, a pot inner wall, and a pot lid. The pot inner wall is placed in the pot body, and the pot body is provided with a heating device, and the heating device is provided at the bottom of the pot inner wall. The pot inner wall comprises an inner metal layer and a uniform heat layer, and the uniform heat layer is used to transfer heat from the bottom wall of the pot inner wall to the side wall. The inner wall of the inner metal layer is provided with a boiling-aid array, and the boiling-aid array comprises a plurality of grooves or protrusions for generating microbubbles. The boiling-aid array comprises a first boiling-aid array located on the bottom wall and a second boiling-aid array located on the side wall. The density of the grooves or protrusions of the first boiling-aid array is not less than the density of the grooves or protrusions of the second boiling-aid array. The first boiling-aid array is used to generate bottom microbubbles on the bottom wall when cooking, and the second boiling-aid array is used to generate side microbubbles on the side wall when cooking. The side microbubbles aggregate with the bottom microbubbles to enhance the boiling effect close to the side wall.

[0010] In one embodiment of the present invention, the equivalent diameter of the groove is smaller than the distance between adjacent grooves; or, the equivalent diameter of the protrusion is smaller than the distance between adjacent protrusions.

[0011] In one embodiment of the present invention, the equivalent diameter of the groove or protrusion is 100 micrometers to 800 micrometers.

[0012] In one embodiment of the present invention, the equivalent depth of the groove or the equivalent height of the protrusion is 30 micrometers to 150 micrometers.

[0013] In one embodiment of the present invention, the equivalent width of the grooves or protrusions in the second boiling aid array along the axial direction of the pot is greater than the equivalent diameter of the grooves or protrusions in the first boiling aid array.

[0014] In one embodiment of the present invention, the equivalent width of the grooves or protrusions in the second boiling aid array along the circumference of the pot is smaller than the equivalent diameter of the grooves or protrusions in the first boiling aid array.

[0015] In one embodiment of the present invention, the inner pot further includes an outer metal layer, the heat-distributing layer is sandwiched between the outer metal layer and the inner metal layer, and the outer metal layer and / or the inner metal layer are made of food-grade metal material.

[0016] In one embodiment of the present invention, the inner pot further comprises a protective metal layer provided on the inner side of the inner pot, and the protective metal layer covers the boiling aid array.

[0017] In addition, the present invention also provides a method for making an easy-to-clean electric hot pot inner pot, comprising providing a metal plate composited with at least an inner metal layer and a heat-uniform layer; etching, engraving, or pressing on one side of the inner metal layer to form a boiling-aid array, wherein the boiling-aid array comprises a plurality of grooves or protrusions; and stretching or stamping the metal plate provided with the boiling-aid array to form the inner pot, so that the density of the boiling-aid array on the bottom wall of the inner pot is greater than the density of the boiling-aid array on the side wall.

[0018] In one embodiment of the present invention, the method further includes coating the inner wall of the manufactured pot with a metal film to form a protective metal layer on the boiling aid array; or, the method further includes sandblasting or carving the inner wall of the manufactured pot or shaping the boiling aid array to form a pot embryo to be coated with a metal film, and polishing the pot embryo and then coating it with a metal film.

[0019] After adopting the above technology, the beneficial effects of the present invention are:

[0020] The present invention provides an inner metal layer and a uniform heat layer, and provides a first boiling aid array for generating bottom microbubbles on the bottom wall of the pot and a second boiling aid array for generating side microbubbles on the side wall of the pot on the inner metal layer. Compared with a smooth metal surface, due to the provision of the uniform heat layer and the provision of the boiling aid arrays on the bottom wall and the side wall, during the heating process, the uniform heat layer can transfer the heat of the bottom wall to the side wall, so that the temperature difference between the side wall and the bottom wall is small, thereby achieving the effect of generating microbubbles in the inner metal layer of the bottom wall and the side wall, and the generated bubbles are relatively uniform; the bottom microbubbles generated by the first boiling aid array located at the edge of the bottom wall can be generated in the floating Under the action of forces, etc., the side microbubbles generated by the second boiling-aid array aggregate, thereby enhancing the boiling effect close to the side wall, making the boiling more uniform during the cooking process and improving the taste of the rice. In addition, the strong boiling effect at the side wall can also disturb the rice grains, so that the rice can be in a dynamic state during the gelatinization stage and is less likely to stick to the wall. The bottom microbubbles generated by the first boiling-aid array located in the middle area of the bottom wall do not contact each other with the side microbubbles, and due to their relatively small volume, their kinetic energy in the process of emitting and the thrust and drag forces on the rice grains are relatively small, thereby avoiding the formation of "crab holes" on the surface of the rice and ensuring the flatness of the rice. In addition, since the boiling-assisting array is formed by a plurality of grooves or protrusions, water and steam can fill and remain in the depressions between the grooves or protrusions. Even if the rice grains are attached to the surface of the inner metal layer and tend to stick to the wall during the gelatinization stage, the water vapor trapped by the rice grains can generate a thrust on the rice grains after being heated and expanded, thereby reducing the adhesion of the rice grains and facilitating the separation of the rice grains under the action of this thrust as well as the thrust and drag of the bubbles, so that the rice will not stick to the inner wall of the pot. In addition, the setting of the boiling-assisting array also changes the geometric structure of the surface of the inner metal layer and improves the wettability of the surface of the inner metal layer. After cooking is completed, the small amount of water remaining in the pot and the small water droplets formed by water vapor in the gaps between the rice can better adhere to the surface of the inner metal layer and remain in the depressions between the grooves or protrusions, thereby forming a layer of water-wetting film. This layer of water-wetting film will infiltrate the rice and the inner wall of the pot, reducing the adhesion between the rice and the pot, so that the rice will not stick to the inner wall of the pot, thereby ultimately achieving a coating-free and non-stick effect, making it convenient for users to clean the pot.

[0021] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of the easy-to-clean electric hot pot according to one embodiment of the present invention;

[0023] Figure 2 This is a schematic structural diagram of the inner pot according to one embodiment of the present invention;

[0024] Figure 3 This is a schematic cross-sectional view of the inner pot according to one embodiment of the present invention;

[0025] Figure 4 for Figure 3 Schematic diagram of the local enlarged structure at A in the middle;

[0026] Figure 5 for Figure 3 Schematic diagram of the local enlarged structure at B in the middle;

[0027] Figure 6 This is a schematic diagram of the top view of the inner pot according to one embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of a partially enlarged structure of the inner pot according to an embodiment of the present invention.

[0029] Figure numerals: pot body 100; heating device 110; pot core 200; inner metal layer 201; uniform heat layer 202; outer metal layer 203; groove 204; connecting part 205; bottom wall 210; first boiling aid array 211; side wall 220; second boiling aid array 221; mouth 222; waist 223; transition connection part 224; cooking cavity 230; pot cover 300. DETAILED DESCRIPTION

[0030] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the technical solutions and embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0032] refer to Figures 1 to 7The present embodiment provides an easy-to-clean electric hot pot, comprising a pot body 100, a pot inner wall 200, and a pot cover 300. The pot inner wall 200 is placed in the pot body 100, and the pot body 100 is provided with a heating device 110, and the heating device 110 is provided at the bottom of the pot inner wall 200. The pot inner wall 200 comprises an inner metal layer 201 and a uniform heat layer 202, and the uniform heat layer 202 is used to transfer heat from the bottom wall of the pot inner wall to the side wall. The inner wall of the inner metal layer 201 is provided with a boiling aid array, and the boiling aid array includes a Multiple grooves or protrusions, the boiling aid array includes a first boiling aid array 211 located on the bottom wall 210 and a second boiling aid array 221 located on the side wall 220, the density of the grooves or protrusions of the first boiling aid array 211 is not less than the density of the grooves or protrusions of the second boiling aid array 221, the first boiling aid array 211 is used to generate bottom microbubbles on the bottom wall when cooking, and the second boiling aid array 221 is used to generate side microbubbles on the side wall when cooking, and the side microbubbles are aggregated with the bottom microbubbles to enhance the boiling effect close to the side wall.

[0033] Specifically, the top of the pot body 100 is provided with an openable and closable cover with a pot lid 300, which can be hinged to the pot body 100 or separately arranged; the pot body 100 has a cylindrical accommodating space, and the pot core 200 can be freely placed in the accommodating space or taken out from the accommodating space to facilitate its cleaning; the pot core 200 is an uncoated pot core, which is used to hold materials to be heated, such as rice, soup and other ingredients. It can be a spherical pot core with outwardly protruding side walls or a straight pot core with vertical side walls. When the pot core 200 is placed in the accommodating space and the pot lid 300 is closed on the pot body 100, the pot lid 300 and the pot core 200 jointly define a cooking cavity 230; the heating device 110 can be a heating plate or an electromagnetic wire coil, which is located at the bottom or side of the accommodating space and heats the ingredients in the cooking cavity by heating the pot core.

[0034] For further reference, Figure 3 The inner pot 200 includes a bottom wall 210 and side walls 220. The bottom wall 210 is located at the bottom of the inner pot 200 and is flat or slightly curved with a certain curvature. The side walls 220 include a mouth 222 located at the top of the inner pot 200, a waist 223 located below the mouth 222, and an arc-shaped transition portion 224 connecting the waist 223 and the bottom wall 210. Optionally, the second boiling aid array 221 is distributed at least on the surface of the transition portion 224.

[0035] It should be noted that the reference Figure 7The aggregation includes an increase in the number of bubbles (compared to a smooth metal surface), that is, the bottom microbubbles generated by the first boiling aid array located at the edge of the bottom wall, under the action of buoyancy and adhesion force on the inner wall of the pot, first rise obliquely along the inner wall of the pot and then detach. During this process, they do not contact the side microbubbles (as shown by the arrow J1 in the figure). It can also refer to the bottom microbubbles and side microbubbles merging with each other to become larger, including the bottom microbubbles located at the edge of the bottom wall merging with the side microbubbles during the oblique rising process (as shown by the arrow J2 in the figure), or the bottom microbubbles merging with the side microbubbles during the rising process, etc., which are not limited here.

[0036] It should also be noted that the specific embodiments of the boiling aid array of the present invention are only examples. Those skilled in the art can enhance the boiling effect close to the side wall by setting patterns to achieve non-stickiness, which should all fall within the scope of the boiling aid array of the present invention.

[0037] In some existing pots, the bubbles generated during the heating process are difficult to control. The bubbles vary in size and are mainly concentrated on the bottom wall of the pot, resulting in uneven boiling during the cooking process, causing different tastes between the upper and lower parts of the rice. Large bubbles are easily generated on the bottom wall, resulting in large "crab holes" on the surface of the rice, affecting the flatness of the rice.

[0038] In this embodiment, an inner metal layer 201 and a uniform heat layer 202 are provided, and a first boiling aid array 211 for generating bottom microbubbles on the bottom wall of the pot and a second boiling aid array 221 for generating side microbubbles on the side wall of the pot are provided on the inner metal layer 201. Compared with a smooth metal surface, since the uniform heat layer 202 is provided and the boiling aid arrays are provided on the bottom wall 210 and the side wall 220, during the heating process, the uniform heat layer 202 can transfer the heat of the bottom wall 210 to the side wall 220, so that the temperature difference between the side wall 220 and the bottom wall 210 is small, thereby achieving the effect of generating microbubbles at both the bottom wall and the side wall of the inner metal layer 201, and the generated bubbles are relatively uniform and located on the bottom wall. The bottom microbubbles generated by the first boiling aid array at the edge can be aggregated with the side microbubbles generated by the second boiling aid array under the action of buoyancy, etc., thereby enhancing the boiling effect close to the side wall, making the boiling more uniform during the cooking process, and improving the taste of the rice. In addition, the strong boiling effect at the side wall can also disturb the rice grains, so that the rice can be in a dynamic state during the gelatinization stage and is less likely to stick to the wall. The bottom microbubbles generated by the first boiling aid array located in the middle area of the bottom wall do not contact each other, and due to their relatively small volume, their kinetic energy during the bubbling process and the thrust and drag force on the rice grains are relatively small, thereby avoiding the formation of "crab holes" on the rice surface and ensuring the flatness of the rice. In addition, since the boiling-assisting array is formed by a plurality of grooves or protrusions, water and steam can fill and remain in the depressions between the grooves or protrusions. Even when the rice grains are attached to the surface of the inner metal layer 201 and tend to stick to the wall during the gelatinization stage, the water vapor trapped by the rice grains can generate a thrust on the rice grains after being heated and expanded, thereby reducing the adhesion of the rice grains and facilitating the separation of the rice grains under the action of the thrust and the thrust and drag force of the bubbles, so that the rice will not stick to the inner wall of the pot 200. In addition, the setting of the boiling-assisting array also changes the surface of the inner metal layer 201. The geometric structure improves the wettability of the surface of the inner metal layer 201, so that after cooking is completed, the small amount of water remaining in the pot 200 and the small water droplets formed by water vapor in the gaps between the rice can better adhere to the surface of the inner metal layer 201 and remain in the depressions between the grooves or protrusions, thereby forming a layer of moisturizing film. This moisturizing film will infiltrate the rice and the inner wall of the pot 200, reducing the adhesion between the rice and the pot 200, so that the rice will not stick to the inner wall of the pot 200, thereby ultimately achieving a non-stick effect without coating, making it easier for users to clean the pot.

[0039] Preferably, reference Figure 3 and Figure 5The boiling aid array comprises a plurality of independently arranged grooves 204, with adjacent grooves connected by metal inner walls forming connecting portions 205. In the early stages of rice cooking, because grooves 204 are closer to heating device 110, the groove bottom and groove walls can three-dimensionally heat the liquid within grooves 204, allowing bubbles to form earlier within grooves 204. By controlling the position of grooves 204, the location of bubble formation can be controlled, making the bubble generation location more easily controllable.

[0040] Furthermore, the groove 204 is provided with a rough surface after roughening treatment (refer to Figure 5 ), the roughness of the rough surface is greater than the roughness of the surface of the connecting portion 205.

[0041] By providing a rough surface that has been roughened in the groove 204, the roughness in the groove 204 is increased. Compared with a smooth surface, a rough surface is more likely to generate microbubbles, avoiding the "crab hole" problem caused by excessive bubbles. At the same time, such a setting further enhances its ability to accommodate water and gas, making it easier for bubbles to be generated from the groove 204, making the generation of bubbles more controllable, and after cooking is completed, the small amount of water remaining in the pot and the small water droplets formed by water vapor in the gaps between the rice can also more easily adhere to the surface of the inner metal layer and remain in the groove 204, which is more conducive to the formation of a moisturizing film. At the same time, it also forms a bionic concave-convex structure similar to a lotus leaf on the inner surface of the inner metal layer 201, further reducing the contact area between the rice and the pot, and improving the non-stick effect.

[0042] It should be noted that the rough surface that has been roughened can be a rough surface formed when processing (such as etching) the groove 204, or it can be a rough surface formed after the groove is formed and then processed by sandblasting, laser engraving, or photolithography, or it can be a concave-convex structure formed in the groove by electroplating or other means. As long as the roughness of the rough surface is greater than the roughness of the surface of the connecting part, no specific limitation is made here.

[0043] In a specific embodiment of the present invention, the equivalent diameter of the grooves is smaller than the spacing between adjacent grooves; alternatively, the equivalent diameter of the protrusions is smaller than the spacing between adjacent protrusions. This arrangement improves the independence of the microbubbles, allowing them to be fully dispersed. This prevents microbubbles emerging from depressions between adjacent grooves or protrusions from merging together at the bottom wall due to proximity, forming larger initial bubbles and resulting in poor uniformity and flatness of the rice.

[0044] In a specific embodiment of the present invention, the equivalent diameter of the groove or protrusion is 100 to 800 microns. Limiting the equivalent diameter of the groove or protrusion to a range of 100 to 800 microns, such as 100 microns, 300 microns, 500 microns, etc., can take into account both the machinability of the boiling-aid array and the non-stick performance of the inner metal layer. There will be no problems such as the inability to generate bubbles in the boiling-aid array, the inability to function effectively, and the difficulty in machining the boiling-aid array due to the equivalent diameter of the groove or protrusion being too small. There will also be no problem such as rice grains being easily stuck in the low-lying areas between the grooves or protrusions and directly transferring heat to the inner metal layer 201, causing them to become burnt and sticky, making the pot difficult to clean, due to the equivalent diameter of the groove or protrusion being too large.

[0045] It should be noted that the present invention does not specifically limit the shape of the groove or protrusion. The equivalent diameter is the maximum circumscribed circle size of the groove notch or protrusion circumferential profile. For example, in a specific embodiment, the shape of the groove is circular, and the equivalent diameter refers to the diameter of the circle; in another specific embodiment, the shape of the protrusion is a regular hexagon, and the equivalent diameter refers to the diameter of the circumscribed circle of the regular hexagon; in another specific embodiment, the shape of the groove is rectangular, and the equivalent diameter refers to the width dimension between the two short sides of the rectangle. Of course, those skilled in the art can also set the groove or protrusion to a square or other shape according to specific conditions such as processing technology requirements, and they will not be listed one by one here.

[0046] In a specific embodiment of the present invention, the equivalent depth of the groove or the equivalent height of the protrusion is 30 microns to 150 microns. If the equivalent depth of the groove or the equivalent height of the protrusion is less than 30 microns, the height difference between the boiling-boosting array and other inner metal layers is not large, and the effect of the liquid in the boiling-boosting array preferentially absorbing the heat of the heating device is not obvious. The boiling-boosting array cannot achieve the effect of preferentially generating bubbles compared to other inner metal layers, and thus cannot play a role in ensuring boiling uniformity and enhancing boiling effect; if the equivalent depth of the groove or the equivalent height of the protrusion is greater than 150 microns, although the boiling-boosting array can be guaranteed to work effectively, the depth is too large and it is easy for foreign matter to remain in the low-lying areas between the grooves or protrusions, which is not conducive to user cleaning and reduces the user's experience.

[0047] Preferably, the equivalent depth of the groove or the equivalent height of the protrusion is greater than or equal to 40 micrometers and less than or equal to 80 micrometers.

[0048] refer to Figure 2 、 Figure 4 and Figure 6In some embodiments of the present invention, the equivalent width of the grooves or protrusions in the second boiling aid array 221 along the axial direction of the pot is greater than the equivalent diameter of the grooves or protrusions in the first boiling aid array 211. For example, the equivalent width of the grooves or protrusions in the second boiling aid array 221 along the axial direction of the pot is D1, and the equivalent diameter of the grooves or protrusions in the first boiling aid array 211 is D, where D1>D.

[0049] Such an arrangement allows the bubbles generated in the second boiling aid array to have a larger axial space to absorb water vapor, which is beneficial to increasing the size of the initial bubbles emerging from the second boiling aid array and improving the boiling effect close to the side wall.

[0050] refer to Figure 2 、 Figure 4 and Figure 6 In some embodiments of the present invention, the equivalent width of the grooves or protrusions in the second boiling aid array 221 along the circumference of the pot is smaller than the equivalent diameter of the grooves or protrusions in the first boiling aid array 211, so as to facilitate the escape of bubbles in the second boiling aid array. For example, the equivalent diameter of the grooves or protrusions in the first boiling aid array 211 is D, and the equivalent width of the grooves or protrusions in the second boiling aid array 221 along the circumference of the pot is D2, D2 <D。

[0051] refer to Figure 5 In a specific embodiment of the present invention, the inner pot 200 further includes an outer metal layer 203. The heat-distributing layer 202 is sandwiched between the outer metal layer 203 and the inner metal layer 201. The outer metal layer 203 and / or the inner metal layer 201 are made of food-grade metal. This arrangement ensures the structural strength of the inner pot while ensuring food safety and preventing any adverse effects of the inner pot 200 on the user's health.

[0052] Optionally, the inner metal layer 201 and the outer metal layer 203 may be made of SUS304 or SUS316L, or other metal materials suitable for food contact, which are not specifically limited here.

[0053] Furthermore, the heat-distributing layer 202 is an aluminum layer, which can improve the thermal conductivity while reducing the weight of the pot 200, making it easier for users to take it in and out. Optionally, a heat pipe is provided in the aluminum layer to improve the thermal conductivity and heat storage effect.

[0054] In a specific embodiment of the present invention, the inner pot 200 further includes a protective metal layer disposed on the inner side of the pot, which covers the boiling-boosting array. This configuration further improves the surface properties of the inner metal layer 201, preventing damage to the boiling-boosting array from scratches. It also improves the gloss of the inner surface of the pot 200, enhancing the aesthetics of the pot 200 and improving the user experience.

[0055] Optionally, the protective metal layer is a metal coating formed by physical vapor deposition, and the thickness of the metal coating is greater than or equal to 0.5 microns and less than or equal to 2.5 microns. This setting can ensure that the coating has an appropriate thickness: if the thickness of the metal coating is less than 0.5 microns, the scratch resistance of the coating will be reduced due to the small thickness of the coating, and the boiling-boosting array will not be effectively protected; if the thickness of the metal coating is greater than 2.5 microns, the metal coating will excessively cover the low-lying areas between the grooves or protrusions, thereby destroying the original rough structure of the low-lying areas between the grooves or protrusions, thereby making it impossible for the boiling-boosting array to generate bubbles preferentially compared to other inner metal layers, and thus unable to ensure boiling uniformity and enhance boiling effect.

[0056] Optionally, the metal coating is a titanium layer, which can be formed by electroplating, physical vapor deposition (PVD) lamination, or lamination, without specific limitation herein. Titanium has excellent friction resistance, and this arrangement can effectively protect the boiling aid array from scratches and damage. It also has certain antibacterial properties, which helps improve the hygiene of the pot 200. Of course, the metal coating can also be a metal or alloy such as chromium, as well as its oxide, etc., without specific limitation herein.

[0057] It is understandable that in some alternative embodiments of the present invention, carburizing or other methods that do not change the surface geometry of the inner metal layer 201 can also be used to prevent the problem of long-term scratching and damage to the boiling aid array.

[0058] In a specific embodiment of the present invention, referring to Figure 1 The pot body 100 includes an inner cover and an outer cover, a cooling fan is provided between the inner cover and the outer cover, the inner cover is provided with an air outlet channel corresponding to the cooling fan, and the air outlet channel is provided toward the pot inner body 200.

[0059] At the end of cooking, the cooling fan blows cold air to the bottom of the pot 200 in an orderly manner, and the temperature of the pot 200 is quickly reduced, thereby promoting the water vapor in the gaps of the rice to liquefy better and adhere to the boiling aid array, which is more conducive to the formation of a water film and improves the non-stick effect of the uncoated material, making it easier for users to serve rice after cooking and also easier for users to clean the pot.

[0060] This embodiment provides a method for making an easy-to-clean electric hot pot inner pot, comprising providing a metal sheet having at least an inner metal layer and a heat-distributing layer; etching, engraving, or pressing one side of the inner metal layer to form a boiling-boosting array, wherein the boiling-boosting array comprises a plurality of grooves or protrusions; and stretching or stamping the metal sheet with the boiling-boosting array to form the inner pot, such that the density of the boiling-boosting array on the bottom wall of the inner pot is greater than that on the side walls. The engraving may be performed by photolithography or laser engraving, which is not specifically limited herein.

[0061] It should be noted that the present invention does not specifically limit the metal plate composite structure. It can be composited with an ordinary metal layer, such as a stainless steel layer, outside the uniform heat layer to protect the inner metal layer 101 and the uniform heat layer 102, or it can be composited with superconducting materials and other materials with special functions.

[0062] In a specific embodiment of the present invention, the method for manufacturing the easy-to-clean electric hot pot inner pot comprises:

[0063] S1: providing a metal plate having at least an inner metal layer and a uniform heat layer;

[0064] S2: etching, engraving or pressing one side of the inner metal layer to form a boiling aid array, wherein the boiling aid array includes a plurality of grooves or protrusions;

[0065] S3: Stretching or stamping a metal plate provided with a boiling-boosting array to form a pot inner wall, so that the density of the boiling-boosting array on the bottom wall of the pot inner wall is greater than the density of the boiling-boosting array on the side wall.

[0066] It should be noted that in some alternative embodiments of the present invention, S3 may be performed first and then S2, that is, the metal sheet is first stretched or stamped, and then a boiling aid array is processed on the pot inner shell, which is not specifically limited here.

[0067] Furthermore, the method also includes plating a metal film on the inner wall of the manufactured pot to form a protective metal layer on the boiling aid array; or, the method also includes sandblasting or carving the inner wall of the manufactured pot or shaping the boiling aid array to form a pot embryo to be plated with a metal film, and polishing the pot embryo and then plating the metal film.

[0068] It should be noted that the shaping of the boiling aid array may refer to adjusting the size and shape of the grooves or protrusions in the boiling aid array, or may refer to adjusting the density, roughness, etc. of the boiling aid array, which is not specifically limited here.

[0069] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. An easy-to-clean electric hot pot, comprising a pot body, a pot inner shell, and a pot cover, wherein the pot inner shell is placed in the pot body, and a heating device for heating the pot inner shell is also provided in the pot body, characterized in that: The inner wall of the pot is provided with a boiling aid array, which includes a plurality of independent grooves for generating microbubbles, and adjacent grooves are connected by the metal inner wall; The boiling aid array includes a first boiling aid array located on the bottom wall of the pot and a second boiling aid array located on the side wall of the pot, wherein the density of the grooves of the first boiling aid array is not less than the density of the grooves of the second boiling aid array; The pot body further includes a cooling fan and an air outlet channel corresponding to the cooling fan, and the air outlet channel is arranged toward the pot inner body.

2. The easy-to-clean electric hot pot according to claim 1, characterized in that: The pot body further comprises an inner cover and an outer cover, the cooling fan is arranged between the inner cover and the outer cover, and the inner cover is provided with the air outlet channel.

3. The easy-to-clean electric hot pot according to claim 1, characterized in that: The cooling fan blows air toward the bottom of the pot at the end of cooking.

4. The easy-to-clean electric hot pot according to claim 1, characterized in that: The second boiling aid array at least covers the transition connection portion between the side wall of the pot and the bottom wall of the pot.

5. The easy-to-clean electric hot pot according to claim 1, characterized in that: A rough surface that has been roughened is provided in the groove.

6. The easy-to-clean electric hot pot according to claim 5, characterized in that: The rough surface is formed during groove processing, or the rough surface is formed by sandblasting, laser processing, photolithography or electroplating after the groove processing.

7. The easy-to-clean electric hot pot according to claim 1, characterized in that: The inner pot is further provided with a titanium metal layer covering the boiling aid array.

8. The easy-to-clean electric hot pot according to claim 7, characterized in that: The titanium metal layer is formed by electroplating, physical vapor deposition coating or pressing.

9. The easy-to-clean electric hot pot according to claim 7, characterized in that: The thickness of the titanium metal layer is greater than or equal to 0.5 micrometers and less than or equal to 2.5 micrometers.

10. The easy-to-clean electric hot pot according to claim 1, characterized in that: The equivalent diameter of the groove is smaller than the distance between adjacent grooves.

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