A method for manufacturing an electric hot pot that is easy to clean and a pot liner of the electric hot pot that is easy to clean

Abstract

The present invention discloses an easy-to-clean electric cooker and a manufacturing method of an easy-to-clean inner pot of the electric cooker. The electric cooker includes a pot body, an inner pot, and a pot lid. The inner pot is placed inside the pot body. The pot body is provided with a heating device, and the heating device is arranged at the bottom of the inner pot. The inner pot includes an inner metal layer and a heat uniformizing layer. The heat uniformizing layer is used to transfer the heat of the bottom wall of the inner pot to the side wall. The inner wall of the inner metal layer is provided with a boiling assisting array. The boiling assisting array includes a plurality of grooves or protrusions for generating microbubbles. The boiling assisting array includes a first boiling assisting array located on the bottom wall and a second boiling assisting array located on the side wall. The density of the grooves or protrusions of the first boiling assisting array is not less than that of the grooves or protrusions of the second boiling assisting array. The first boiling assisting array is used to generate bottom microbubbles on the bottom wall during cooking rice, and the second boiling assisting array is used to generate side microbubbles on the side wall during cooking rice. The side microbubbles and the bottom microbubbles aggregate to enhance the boiling effect near the side wall. The present invention can make the boiling more uniform during the cooking process and achieve non-stick without a coating.

Description

Technical Field

[0001] The present invention belongs to the field of household appliances, and particularly relates to an easy-to-clean electric rice cooker and a manufacturing method of an easy-to-clean inner pot of an electric rice cooker. Background Art

[0002] Electric rice cookers such as rice cookers generally include a pot body and a pot lid. An inner pot and a heating device such as a heating plate or an IH coil are provided in the pot body. The inner pot is generally made of a metal material. After the heating device is powered on, heat can be transferred to the inner pot, so that the rice in the inner pot can be heated and cooked. However, the problem of sticking to the pot occurs during the cooking process of the electric rice cooker, making it difficult to clean the inner pot after meals and deteriorating the user experience. In the prior art, in order to solve this technical problem, there are mainly the following types of solutions:

[0003] One type is to provide a non-stick coating on the inner wall of the inner pot. However, the non-stick coating is prone to peeling during long-term cooking, especially in the case of high-temperature cooking and dry burning. The non-stick coating is more likely to peel off, affecting its non-stick effect and also causing certain impacts on human health. In this regard, in the prior art, grooves are also provided on the surface of the inner wall of the inner pot, and the non-stick coating is only provided in the grooves, in order to reduce the use area of the coating and minimize the probability of coating peeling caused by factors such as scratching. However, this coating still has a risk of peeling.

[0004] One type is to make the surface of the cooking utensil into a non-smooth surface with convex unit bodies, and it is disclosed that the convex unit bodies can be replaced with pits. However, the applicant found during the implementation of the invention that the bubbles generated during the heating process of this solution are relatively uncontrollable, the bubble sizes are different and mainly concentrated on the bottom wall of the inner pot, making the boiling during the cooking process uneven, resulting in different tastes of the upper and lower parts of the rice.

[0005] Another type is the water lubricating film 0 coating technology previously applied by the applicant. On this basis, the applicant continued to research and developed the technical solution of the present invention, further improving the boiling uniformity during the cooking process and the flatness of the rice. Summary of the Invention

[0006] The present invention provides an easy-to-clean electric rice cooker and a manufacturing method of an easy-to-clean inner pot of an electric rice cooker to solve at least one of the above technical problems.

[0007] To achieve the above object, the specific technical solutions of the present invention are as follows:

[0008] An electric hot pot that is easy to clean, comprising a pot body, a pot liner, and a pot lid. The pot liner is placed inside the pot body. The pot body is provided with a heating device, and the heating device is arranged at the bottom of the pot liner. Among them, the pot liner includes an inner metal layer and a heat - uniforming layer. The heat - uniforming layer is used to transfer the heat at the bottom wall of the pot liner to the side wall. The inner wall of the inner metal layer is provided with a boiling - assisting array. The boiling - assisting array includes a plurality of grooves or protrusions for generating micro - bubbles. The boiling - assisting array includes a first boiling - assisting array located on the bottom wall and a second boiling - assisting array located on the side wall. The density of the grooves or protrusions of the first boiling - assisting array is not less than that of the grooves or protrusions of the second boiling - assisting array. The first boiling - assisting array is used to generate bottom micro - bubbles on the bottom wall during rice cooking, and the second boiling - assisting array is used to generate side micro - bubbles on the side wall during rice cooking. The side micro - bubbles and the bottom micro - bubbles aggregate to enhance the boiling effect near the side wall.

[0009] In an embodiment of the present invention, the equivalent diameter of the groove is less than the spacing between adjacent grooves; or, the equivalent diameter of the protrusion is less than the spacing between adjacent protrusions.

[0010] In an embodiment of the present invention, the equivalent diameter of the groove or protrusion is 100 microns to 800 microns.

[0011] In an embodiment of the present invention, the equivalent depth of the groove or the equivalent height of the protrusion is 30 microns to 150 microns.

[0012] In an embodiment of the present invention, the equivalent width of the grooves or protrusions in the second boiling - assisting array along the axial direction of the pot liner is greater than the equivalent diameter of the grooves or protrusions in the first boiling - assisting array.

[0013] In an embodiment of the present invention, the equivalent width of the grooves or protrusions in the second boiling - assisting array along the circumferential direction of the pot liner is less than the equivalent diameter of the grooves or protrusions in the first boiling - assisting array.

[0014] In an embodiment of the present invention, the pot liner further includes an outer metal layer, the heat - uniforming layer is sandwiched between the outer metal layer and the inner metal layer, and the outer metal layer and / or the inner metal layer is made of food - grade metal material.

[0015] In an embodiment of the present invention, the pot liner further includes a protective metal layer arranged on the inner side of the pot liner, and the protective metal layer covers the boiling - assisting array.

[0016] In addition, the present invention also provides a manufacturing method for the pot liner of an electric hot pot that is easy to clean, including providing a metal sheet at least compounded with an inner metal layer and a heat - uniforming layer; etching or engraving or pressing on one side of the inner metal layer to form a boiling - assisting array, the boiling - assisting array including a plurality of grooves or protrusions; stretching or stamping the metal sheet provided with the boiling - assisting array to make a pot liner, so that the density of the boiling - assisting array on the bottom wall of the pot liner is greater than that on the side wall.

[0017] 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 then polishing the pot embryo and coating it with a metal film.

[0018] After adopting the above technology, the beneficial effects of the present invention are:

[0019] 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, since the uniform heat layer is provided and the boiling aid arrays are provided 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 at both the bottom wall and the side wall inner metal layer 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 on the floating Under the action of force, 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. 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 not prone to sticking 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 the side microbubbles, and due to their relatively small volume, their kinetic energy in the process of bubbling out and the thrust and drag force 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-aid 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 rice grains to detach under the action of the thrust and the thrust and dragging force of the bubbles, so that the rice will not stick to the inner wall of the pot. In addition, the setting of the boiling-aid 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, so that 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, reduce the adhesion between the rice and the pot, and prevent the rice from sticking 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.

[0020] 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

[0021] Figure 1 It is a schematic structural diagram of the easy-to-clean electric cooker according to an embodiment of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the inner pot according to an embodiment of the present invention;

[0023] Figure 3 It is a schematic cross-sectional structural diagram of the inner pot according to an embodiment of the present invention;

[0024] Figure 4 is Figure 3 a partial enlarged structural diagram at position A in

[0025] Figure 5 is Figure 3 a partial enlarged structural diagram at position B in

[0026] Figure 6 It is a schematic top view structural diagram of the inner pot according to an embodiment of the present invention;

[0027] Figure 7 It is a partial enlarged structural diagram of the inner pot according to an embodiment of the present invention.

[0028] Reference numerals: pot body 100; heating device 110; inner pot 200; inner metal layer 201; heat - uniforming layer 202; outer metal layer 203; groove 204; connecting part 205; bottom wall 210; first boiling - assisting array 211; side wall 220; second boiling - assisting array 221; mouth part 222; waist part 223; transition connecting part 224; cooking cavity 230; pot lid 300. Detailed Embodiments

[0029] In order to better understand the purpose, structure and function of the present invention, the present invention will be further described in detail below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the technical solutions provided by the present invention and the given embodiments, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0030] It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] Refer to Figures 1 to 7, an electric rice cooker provided in this embodiment includes a pot body 100, a pot liner 200, and a pot lid 300. The pot liner 200 is placed inside the pot body 100. The pot body 100 is provided with a heating device 110, and the heating device 110 is arranged at the bottom of the pot liner 200. The pot liner 200 includes an inner metal layer 201 and a heat - uniforming layer 202. The heat - uniforming layer 202 is used to transfer the heat at the bottom wall of the pot liner to the side wall. The inner wall of the inner metal layer 201 is provided with a boiling - assisting array. The boiling - assisting array includes a plurality of grooves or protrusions for generating micro - bubbles. The boiling - assisting array includes a first boiling - assisting array 211 located on the bottom wall 210 and a second boiling - assisting array 221 located on the side wall 220. The density of the grooves or protrusions of the first boiling - assisting array 211 is not less than that of the grooves or protrusions of the second boiling - assisting array 221. The first boiling - assisting array 211 is used to generate bottom micro - bubbles on the bottom wall during rice cooking, and the second boiling - assisting array 221 is used to generate side micro - bubbles on the side wall during rice cooking. The side micro - bubbles and the bottom micro - bubbles aggregate to enhance the boiling effect near the side wall.

[0032] Specifically, the top of the pot body 100 is provided with a pot lid 300 that can be opened and closed. The pot lid 300 and the pot body 100 can be hinged or separately arranged. The pot body 100 has a cylindrical accommodating space, and the pot liner 200 can be freely placed into or taken out of the accommodating space for easy cleaning. The pot liner 200 is a non - coated pot liner for holding materials to be heated, such as ingredients like rice and soup. It can be a spherical liner with an outward - bulging side wall or a straight liner with a vertical side wall. When the pot liner 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 liner 200 jointly define a cooking cavity 230. The heating device 110 can be a heating plate or an electromagnetic 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 liner.

[0033] Further, referring to Figure 3 , the pot liner 200 includes a bottom wall 210 and a side wall 220. The bottom wall 210 is arranged at the bottom of the pot liner 200 and is a flat surface or a curved surface that slightly bulges towards the center with a certain curvature. The side wall 220 includes a mouth part 222 provided at the upper part of the pot liner 200, a waist part 223 provided below the mouth part 222, and an arc - shaped transition connecting part 224 connecting the waist part 223 and the bottom wall 210. Optionally, the second boiling - assisting array 221 is at least distributed on the surface of the transition connecting part 224.

[0034] It should be noted that referring to Figure 7, the aggregation includes an increase in the number of bubbles (compared to a smooth metal surface), that is, the bottom micro-bubbles generated by the first boiling assistance array at the edge of the bottom wall rise obliquely along the inner wall of the pot under the action of buoyancy and the adhesion force of the inner wall of the pot and then break away. During this process, they do not contact the side micro-bubbles (as shown by the arrow J1 in the figure), or it can also refer to the bottom micro-bubbles and the side micro-bubbles merging and growing larger, including the bottom micro-bubbles at the edge of the bottom wall merging with the side micro-bubbles during the oblique upward rise (as shown by the arrow J2 in the figure), or the bottom micro-bubbles merging with the side micro-bubbles during the upward rise, etc., which are not limited herein.

[0035] It should also be noted that the specific implementation manners of the boiling assistance array of the present invention are only examples. Those skilled in the art should belong to the scope of the boiling assistance array of the present invention if they enhance the boiling effect near the side wall by setting patterns to achieve non-sticking.

[0036] In some existing pot liners, the bubbles generated during the heating process are relatively uncontrollable. The bubble sizes are uneven and mainly concentrated at the bottom wall of the pot liner, resulting in uneven boiling during the cooking process, causing different tastes in the upper and lower parts of the rice, and large bubbles are easily generated at the bottom wall, thus forming relatively large "crab holes" on the surface of the rice, affecting the flatness of the rice.

[0037] In this embodiment, by providing an inner metal layer 201 and a heat - uniforming layer 202, and arranging a first boiling - assisting array 211 for generating bottom micro - bubbles on the bottom wall of the pot liner and a second boiling - assisting array 221 for generating side micro - bubbles on the side wall of the pot liner, compared with a smooth metal surface: due to the provision of the heat - uniforming layer 202 and the arrangement of the boiling - assisting arrays on the bottom wall 210 and the side wall 220, during the heating process, the heat - uniforming layer 202 can transfer the heat of the bottom wall 210 to the side wall 220, making the temperature difference between the side wall 220 and the bottom wall 210 relatively small. Thus, the effect that micro - bubbles can be generated at both the inner metal layer 201 of the bottom wall and the side wall is achieved, and the generated bubbles are relatively uniform. The bottom micro - bubbles generated by the first boiling - assisting array at the edge of the bottom wall can aggregate with the side micro - bubbles generated by the second boiling - assisting array under the action of buoyancy and the like, enhancing the boiling effect near the side wall, making the boiling during the cooking process more uniform, improving the taste of the rice. Moreover, the stronger boiling effect at the side wall can also disturb the rice grains, making the rice grains in a dynamic state during the gelatinization stage and less likely to stick to the wall. The bottom micro - bubbles generated by the first boiling - assisting array in the middle area of the bottom wall do not contact the side micro - bubbles. And because of their relatively small volume, their kinetic energy during the rising process and the thrust and drag force on the rice grains are relatively small, thus 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 low - lying areas between the grooves or protrusions. Even when the rice grains lean against the surface of the inner metal layer 201 and tend to stick to the wall during the gelatinization stage, the water vapor sealed by the rice grains can generate a thrust on the rice grains after being heated and expanded, reducing the adhesion force of the rice grains, facilitating the detachment of the rice grains under the action of this thrust, the thrust and drag force of the bubbles, so that the rice does not stick to the inner wall of the pot liner 200. Moreover, the arrangement of the boiling - assisting array also changes the geometric structure of the surface of the inner metal layer 201, improving the wettability of the surface of the inner metal layer 201. After the rice - cooking is completed, the small amount of water remaining in the pot liner 200 and the small water droplets formed by the water vapor in the gaps between the rice grains can better adhere to the surface of the inner metal layer 201 and remain in the low - lying areas between the grooves or protrusions, thus forming a water - moist film. This water - moist film will infiltrate the rice and the inner wall of the pot liner 200, reducing the adhesion force between the rice and the pot liner 200, so that the rice does not stick to the inner wall of the pot liner 200, and finally achieving the non - stick effect without a coating, which is convenient for users to clean the pot liner.

[0038] Preferably, referring to Figure 3 and Figure 5, the boiling assisting array is composed of a plurality of independently arranged grooves 204, and a connecting part 205 is formed by a metal inner wall between adjacent grooves. In the early stage of rice cooking, since the grooves 204 are closer to the heating device 110, the bottom and walls of the grooves can perform three-dimensional heating on the liquid in the grooves 204, so that bubbles can be generated in the grooves 204 earlier. By controlling the positions of the grooves 204, the generation positions of the bubbles can be controlled, so that the generation positions of the bubbles are more controllable.

[0039] Further, a roughened surface (refer to Figure 5 ) is provided in the groove 204, and the roughness of the roughened surface is greater than the roughness of the surface of the connecting part 205.

[0040] By providing a roughened surface obtained by roughening treatment 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 problem of "crab holes" caused by too large bubbles. At the same time, such a setting also further improves its ability to accommodate water and gas, making it easier for bubbles to generate from the groove 204, making the generation of bubbles more controllable. And after the rice cooking is finished, a small amount of water remaining in the pot liner and small water droplets formed by water vapor in the gaps of 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 water lubricating film. At the same time, it also makes the inner surface of the inner metal layer 201 form a bionic concave-convex structure similar to a lotus leaf, further reducing the contact area between the rice and the pot liner and improving the non-stick effect.

[0041] It should be noted that the roughened surface obtained by roughening treatment can be the roughened surface formed during the processing (such as etching) of the groove 204, or the roughened surface formed after the groove is formed and then processed by means such as sandblasting, laser engraving or photolithography, or an uneven structure is formed in the groove by means such as electroplating, as long as the roughness of the roughened surface is greater than the roughness of the surface of the connecting part, and no specific limitation is made here.

[0042] In a specific 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. Such a setting can improve the independence between microbubbles, so that the microbubbles can be fully dispersed, preventing the microbubbles emerging from the low-lying areas between adjacent grooves or adjacent protrusions from fusing with each other at the bottom wall to form larger initial bubbles due to being too close, resulting in poor uniformity and flatness of the rice.

[0043] In a specific embodiment of the present invention, the equivalent diameter of the groove or protrusion is 100 microns to 800 microns. Defining the equivalent diameter of the groove or protrusion within the range of 100 microns to 800 microns, such as 100 microns, 300 microns, 500 microns, etc., can take into account the processability of the boiling enhancement array and the non-stick performance of the inner metal layer. There will be no problem that bubbles cannot be generated in the boiling enhancement array, it cannot effectively play its role, and the boiling enhancement array is difficult to process due to the too small equivalent diameter of the groove or protrusion. Nor will there be a problem that the rice grains are easily stuck in the low-lying areas between the grooves or protrusions and directly transfer heat to the inner metal layer 201, resulting in charring and sticking, making it difficult to clean the pot liner due to the too large equivalent diameter of the groove or protrusion.

[0044] 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 opening or the circumferential contour of the protrusion. 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 into a square shape or the like according to specific situations such as processing technology requirements, and will not list them one by one here.

[0045] 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 enhancement array and other inner metal layers is not significant, and the effect of the liquid in the boiling enhancement array preferentially absorbing the heat of the heating device is not obvious. The boiling enhancement array cannot achieve the effect of preferentially generating bubbles compared with other inner metal layers, and thus cannot play the role of ensuring the boiling uniformity and enhancing the boiling effect; if the equivalent depth of the groove or the equivalent height of the protrusion is greater than 150 microns, although the boiling enhancement array can effectively play its role, too large a depth is likely to cause foreign matters to remain in the low-lying areas between the grooves or protrusions, which is not conducive to user cleaning and reduces the user experience.

[0046] Preferably, the equivalent depth of the groove or the equivalent height of the protrusion is greater than or equal to 40 microns and less than or equal to 80 microns.

[0047] Reference 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 assisting array 221 along the axial direction of the pot liner is greater than the equivalent diameter of the grooves or protrusions in the first boiling assisting array 211. For example, the equivalent width of the grooves or protrusions in the second boiling assisting array 221 along the axial direction of the pot liner is D1, and the equivalent diameter of the grooves or protrusions in the first boiling assisting array 211 is D, where D1 > D.

[0048] Such a setting allows the bubbles generated in the second boiling assisting 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 assisting array and improving the boiling effect near the side wall.

[0049] Reference 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 assisting array 221 along the circumferential direction of the pot liner is less than the equivalent diameter of the grooves or protrusions in the first boiling assisting array 211, so as to facilitate the detachment of the bubbles in the second boiling assisting array. For example, the equivalent diameter of the grooves or protrusions in the first boiling assisting array 211 is D, and the equivalent width of the grooves or protrusions in the second boiling assisting array 221 along the circumferential direction of the pot liner is D2, where D2 < D.

[0050] Reference Figure 5 , in a specific embodiment of the present invention, the pot liner 200 further includes an outer metal layer 203, the heat - uniforming layer 202 is sandwiched between the outer metal layer 203 and the inner metal layer 201, and the outer metal layer 203 and / or the inner metal layer 201 are made of food - grade metal materials. Such a setting can ensure the structural strength of the pot liner while ensuring food safety and avoiding adverse effects on the health of users caused by the pot liner 200.

[0051] Optionally, the inner metal layer 201 and the outer metal layer 203 can be made of SUS304 or SUS316L materials, or other metal materials compliant with food contact use, which are not specifically limited herein.

[0052] Furthermore, the heat - uniforming layer 202 is an aluminum layer, which can improve the heat conduction performance while reducing the weight of the pot liner 200, facilitating the user to pick up and place it. Optionally, heat conduction tubes for improving the heat conduction and heat storage effects are provided inside the aluminum layer.

[0053] In a specific embodiment of the present invention, the pot liner 200 further includes a protective metal layer provided on the inner side of the pot liner, and the protective metal layer covers the boiling assisting array. Such a setting can further improve the surface performance of the inner metal layer 201, prevent damage to the boiling assisting array caused by scratching, and can also change the luster of the inner surface of the pot liner 200, improve the aesthetics of the pot liner 200, and enhance the user experience.

[0054] 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 micrometers and less than or equal to 2.5 micrometers. Such a setting can make the coating have a suitable thickness: if the thickness of the metal coating is less than 0.5 micrometers, the scratch resistance performance will be reduced due to the too small thickness of the coating, and the boiling aid array cannot be effectively protected; if the thickness of the metal coating is greater than 2.5 micrometers, the metal coating will overly cover the low-lying areas between the grooves or protrusions, destroying the original rough structure in the low-lying areas between the grooves or protrusions, so that the boiling aid array cannot achieve the effect of preferentially generating bubbles compared with other inner metal layers, and thus cannot play the role of ensuring the boiling uniformity and enhancing the boiling effect.

[0055] Optionally, the metal coating is a titanium metal layer, which can be formed by electroplating, physical vapor deposition (PVD) coating or lamination, and is not specifically limited herein. Titanium material has good friction resistance. The above setting can effectively protect the boiling aid array. While avoiding the scratching and damage of the boiling aid array, it also has certain antibacterial properties, which is beneficial to improving the hygiene of the pot liner 200. Of course, the metal coating can also be other metals or alloys such as chromium and their oxides, etc., and is not specifically limited herein.

[0056] It can be understood that in some alternative embodiments of the present invention, methods such as carburizing that do not change the surface geometric structure of the inner metal layer 201 can also be used to prevent the long-term scratching and damage of the boiling aid array.

[0057] In a specific embodiment of the present invention, referring to Figure 1 , the pot body 100 includes an inner cover and an outer shell. A cooling fan is provided between the inner cover and the outer shell. The inner cover is provided with an air outlet channel corresponding to the cooling fan, and the air outlet channel is arranged towards the pot liner 200.

[0058] At the end of cooking, the cooling fan orderly blows cold air to the bottom of the pot liner 200, so that the temperature of the pot liner 200 can be quickly reduced, thereby promoting the better liquefaction of the water vapor in the rice voids and attaching to the boiling aid array, which is more conducive to the formation of the water film, improves the non-stick effect without coating, facilitates the user to scoop out the rice after cooking, and is also more conducive to the user to clean the pot liner.

[0059] This embodiment provides a method for manufacturing an easy-to-clean electric rice cooker pot liner, including providing a metal sheet at least compounded with an inner metal layer and a heat homogenizing layer; etching, engraving or pressing on one side of the inner metal layer to form a boiling aid array, and the boiling aid array includes a plurality of grooves or protrusions; stretching or stamping the metal sheet provided with the boiling aid array to form a pot liner, so that the density of the boiling aid array on the bottom wall of the pot liner is greater than the density of the boiling aid array on the side wall. Among them, the engraving can be photolithography or laser engraving, and is not specifically limited herein.

[0060] It should be noted that the present invention does not specifically limit the metal sheet composite structure, and a common metal layer, such as a stainless steel layer, can be composite outside the heat - uniforming layer to protect the inner metal layer 101 and the heat - uniforming layer 102, or a material with special functions such as a superconducting material can also be composite.

[0061] In a specific embodiment of the present invention, the manufacturing method of the easily - cleaned electric - heating pot inner pot successively includes:

[0062] S1: Provide a metal sheet at least composite with an inner metal layer and a heat - uniforming layer;

[0063] S2: Etch or engrave or press on one side of the inner metal layer to form a boiling - assisting array, and the boiling - assisting array includes a plurality of grooves or protrusions;

[0064] S3: Stretch or stamp the metal sheet provided with the boiling - assisting array to form an inner pot, so that the density of the boiling - assisting array on the bottom wall of the inner pot is greater than that on the side wall.

[0065] It should be noted that in some alternative embodiments of the present invention, S3 can also be carried out first and then S2, that is, first stretch or stamp the metal sheet, and then process the boiling - assisting array on the inner pot, and no specific limitation is made here.

[0066] Furthermore, the method further includes plating a metal film on the inner wall of the formed inner pot to form a protective metal layer on the boiling - assisting array; or, the method further includes sandblasting or engraving or shaping the boiling - assisting array on the inner wall of the formed inner pot to form a metal - film - to - be - plated inner - pot blank, and plating a metal film after polishing the inner - pot blank.

[0067] It should be noted that the shaping of the boiling - assisting array can refer to adjusting the size and shape of the grooves or protrusions in the boiling - assisting array, or can also refer to adjusting the density, roughness, etc. of the boiling - assisting array, and no specific limitation is made here.

[0068] It can be understood that the present invention is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. An electric rice cooker that is easy to clean, comprising a pot body, a pot liner, and a pot lid. The pot liner is placed inside the pot body, and the pot body is provided with a heating device. The heating device is arranged at the bottom of the pot liner. It is characterized in that the pot liner includes an inner metal layer and a heat - uniforming layer. The heat - uniforming layer is used to transfer the heat of the bottom wall of the pot liner to the side wall. The inner wall of the inner metal layer is provided with a boiling - assisting array. The boiling - assisting array includes a plurality of independent grooves for generating micro - bubbles. A connecting portion is formed by the metal inner wall between adjacent grooves. A roughened surface obtained by roughening treatment is provided in the grooves. The boiling - assisting array includes a first boiling - assisting array located on the bottom wall and a second boiling - assisting array located on the side wall. The groove density of the first boiling - assisting array is not less than that of the second boiling - assisting array. The first boiling - assisting array is used to generate bottom micro - bubbles on the bottom wall during rice cooking, and the second boiling - assisting array is used to generate side micro - bubbles on the side wall during rice cooking. The side micro - bubbles and the bottom micro - bubbles aggregate to enhance the boiling effect near the side wall.

2. The electric hot pot according to claim 1, characterized in that, The equivalent diameter of the grooves is less than the spacing between adjacent grooves.

3. The electric cooking pot that is easy to clean according to claim 1, wherein, The equivalent diameter of the grooves is 100 microns to 800 microns.

4. The electric hot pot according to claim 1, wherein The equivalent depth of the grooves is 30 microns to 150 microns.

5. The electric hot pot according to claim 1, wherein, The equivalent width of the grooves in the second boiling - assisting array along the axial direction of the pot liner is greater than the equivalent diameter of the grooves in the first boiling - assisting array.

6. The electric hot pot according to claim 1, characterized in that, The equivalent width of the grooves in the second boiling - assisting array along the circumferential direction of the pot liner is less than the equivalent diameter of the grooves in the first boiling - assisting array.

7. The electric hot pot according to claim 1, wherein The pot liner further includes an outer metal layer. The heat - uniforming layer is sandwiched between the outer metal layer and the inner metal layer. The outer metal layer and / or the inner metal layer is made of a food - grade metal material.

8. A kind of electric hot pot that is easy to clean according to any one of claims 1 to 7, characterized in that, The pot liner further includes a protective metal layer provided on the inner side of the pot liner. The protective metal layer covers the boiling - assisting array.

9. A manufacturing method of an electric rice cooker inner pot that is easy to clean, used for preparing the electric rice cooker that is easy to clean as described in any one of claims 1-8, characterized in that, It includes providing a metal sheet at least compounded with an inner metal layer and a heat - uniforming layer; etching or engraving or pressing on one side of the inner metal layer to form a boiling - assisting array, and the boiling - assisting array includes a plurality of grooves; stretching or stamping the metal sheet provided with the boiling - assisting array to make a pot liner, so that the density of the boiling - assisting array on the bottom wall of the pot liner is greater than that on the side wall.

10. The manufacturing method of an electric rice cooker inner pot that is easy to clean according to claim 9, characterized in that, The method further includes plating a metal film on the inner wall of the made pot liner to form a protective metal layer on the boiling - assisting array; or, the method further includes sandblasting or engraving or shaping the boiling - assisting array on the inner wall of the made pot liner to form a pot embryo to be plated with a metal film, and then polishing the pot embryo and plating a metal film.

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