CN109452873B - Inner pot for an electric cooking appliance, electric cooking appliance and method for producing an inner pot - Google Patents

Abstract

The invention provides an inner pot for an electric cooking appliance, an electric cooking appliance and a method for manufacturing the inner pot. The inner pot comprises a ceramic body with an opening formed at the top, a magnetic conductive metal layer is at least partially thermally sprayed on the outer side surface of the ceramic body, and the roughness of the outer side surface of the ceramic body is 8-12 mu m. The inner pot for the electric cooking appliance comprises the ceramic body and the magnetic conductive metal layer, the ceramic body can enable the heat preservation effect of the inner pot to be better, and rice in the inner pot can be soft and the temperature is more uniform. The magnetic conductive metal layer can realize electromagnetic induction heating. In addition, the proper roughness is arranged on the outer side surface of the ceramic body, so that the bonding strength of the ceramic body and the magnetic conduction metal layer can be enhanced, the ceramic body and the magnetic conduction metal layer are tightly attached, and the service life of the inner pot is prolonged.

Description

Inner pot for an electric cooking appliance, electric cooking appliance and method for producing an inner pot

Technical Field

The present invention relates generally to the field of electrically heated appliances, and more particularly to an inner pot for an electric cooking appliance, and a method of manufacturing an inner pot.

Background

At present, a plurality of electric cooking appliances which are heated by electromagnetic induction exist on the market, and the main base materials of the electric cooking appliances are all made of metal materials. Because the metal materials have over-good conduction performance, when the magnetic conduction is used for heating, the outer side surface of the inner pot is locally heated, and the corresponding inner side surface is also locally heated, so that the rice in the pot is locally heated, and the cooked rice has a local scorching phenomenon. In addition, in the cooking process of the electric cooking appliance, 4 stages are usually provided, including a water absorption stage, a heating stage, a boiling stage and a rice stewing stage, and the common inner pot made of metal has over-good heat conduction performance, so that the temperature of the rice is not uniform in the rice stewing stage, and the softening effect of the rice is not good. Moreover, the temperature of the metal inner pot is lost rapidly, and the temperature fluctuation is relatively large, so that the heat preservation of the rice is not facilitated.

In contrast, the inner pot made of the ceramic material has good heat insulation performance. However, ceramic materials cannot generate electromagnetic induction and thus can be heated only by using an electric hot plate. Some of the ceramic inner pot adopts a mode of pasting a magnetic conduction film at the bottom of the ceramic inner pot so as to be used for electromagnetic heating. However, the method has the disadvantages of complex process, low qualified rate and high requirements on the flatness of the attached surface or the size of the curved surface. Pot dimensional tolerance is big in the pottery, and corresponding curved surface radian tolerance can be very big, pastes the magnetic conduction membrane on the curved surface, often can be because the radian mismatches and easily trap the gas and produce the bubble in attached in-process, influence the pottery pot life-span. In addition, the temperature requirement for the thermal adhesion of the ceramic biscuit and the magnetic conduction film is high.

Therefore, there is a need for an inner pot for an electric cooking appliance, an electric cooking appliance and a method of manufacturing an inner pot that at least partially solve the problems of the prior art.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In order to at least partially solve the above problems, the present invention provides an inner pot for an electric cooking appliance, the inner pot comprising a ceramic body having an opening formed at a top portion, a magnetically conductive metal layer being at least partially thermally fused on an outer side surface of the ceramic body, the outer side surface of the ceramic body having a roughness of 8 to 12 μm.

The inner pot for the electric cooking appliance comprises the ceramic body and the magnetic conductive metal layer, the ceramic body can enable the heat preservation effect of the inner pot to be better, and rice in the inner pot can be soft and the temperature is more uniform. The magnetic conductive metal layer can realize electromagnetic induction heating. In addition, the proper roughness is arranged on the outer side surface of the ceramic body, so that the bonding strength of the ceramic body and the magnetic conduction metal layer can be enhanced, the ceramic body and the magnetic conduction metal layer are tightly attached, and the service life of the inner pot is prolonged.

Optionally, the ceramic body is at least partially heat-fused with a metal layer on an inside surface, the inside surface having a roughness of 2-12 μm. According to this aspect, appropriate roughness may increase the strength of the bonding of the inner side surface of the ceramic body with the metal layer.

Optionally, the metal layer is a magnetic conductive metal layer or a heat conductive metal layer. According to the scheme, the magnetic conduction metal layer is arranged on the inner side of the inner pot, so that the heating efficiency can be improved, or the heat conduction metal layer is arranged on the inner side of the inner pot, so that the heat transfer performance can be enhanced, and the temperature in the inner pot is uniform.

Optionally, the material of the magnetic conductive metal layer is silver-aluminum alloy. According to the scheme, the silver-aluminum alloy can give consideration to both the electromagnetic induction performance and the performance of combining with the ceramic body.

Optionally, the inner side surface of the ceramic body is provided with a glaze layer. According to the scheme, the glaze layer is arranged, so that the mechanical strength and the thermal stability of the inner pot can be improved, the inner side surface of the inner pot can be smooth, and the inner pot is easy to clean.

Optionally, the inner side surface of the inner pan is provided with a non-stick coating. According to this scheme, a non-stick function can be achieved.

Optionally, the roughness of the inner surface of the inner pan bonded to the non-stick coating is 2-6 μm. According to the scheme, the proper roughness can increase the bonding strength of the inner side surface of the inner pan and the non-stick coating.

Optionally, the outer side surface of the inner pan is provided with a protective coating, and the protective coating at least covers the magnetic conductive metal layer. According to the scheme, the magnetic conductive metal layer can be protected, and the service life is prolonged.

Optionally, the roughness of the outer surface of the magnetically permeable metal layer bonded to the protective coating is 2-12 μm. According to the scheme, the proper roughness can increase the strength of the combination of the magnetic conductive metal layer and the protective coating.

According to another aspect of the present invention, there is also provided an electric cooking appliance comprising an inner pot according to any one of the preceding claims.

According to the electric cooking appliance, the inner pot comprises the ceramic body and the magnetic conductive metal layer, the ceramic body can enable the heat preservation effect of the inner pot to be better, and rice in the inner pot can be soft and the temperature is more uniform. The magnetic conductive metal layer can realize electromagnetic induction heating. In addition, the proper roughness is arranged on the outer side surface of the ceramic body, so that the bonding strength of the ceramic body and the magnetic conduction metal layer can be enhanced, the ceramic body and the magnetic conduction metal layer are tightly attached, and the service life of the inner pot is prolonged.

According to still another aspect of the present invention, there is also provided a method of manufacturing the inner pot as described above, the method including the steps of:

step 1, forming a body structure of an inner pot by using a ceramic material;

step 2, carrying out sand blasting treatment on a preset position of the outer side surface of the ceramic body of the inner pot to reach a first preset roughness, wherein the first preset roughness is 8-12 microns; and

and 3, hot-melt spraying a magnetic metal layer at the preset position on the outer side surface of the ceramic body.

The method for manufacturing the inner pot has the advantages of simple process, convenient operation and good bonding property between the magnetic conductive metal layer and the ceramic body.

Optionally, the method further comprises, after step 1:

performing sand blasting on a preset position of the inner side surface of the ceramic body of the inner pot to reach a second preset roughness, wherein the second preset roughness is 2-12 mu m; and

and thermally spraying a metal layer at the predetermined position on the inner side surface of the ceramic body.

According to the scheme, the process for arranging the metal layer is simple, the operation is convenient, and the bonding property between the metal layer and the ceramic body is good.

Optionally, the method further comprises forming a glaze layer on the inner side surface of the ceramic body of the inner pot after step 1. According to the scheme, the glaze layer can improve the mechanical strength and the thermal stability of the inner pot, and the inner side surface is smooth and easy to clean.

Optionally, the method further comprises:

performing sand blasting on the inner side surface of the inner pan to reach a third predetermined roughness, wherein the third predetermined roughness is 2-6 μm; and

and forming a non-stick coating on the inner side surface of the inner pot.

According to this scheme, a non-stick function can be achieved.

Optionally, the method further comprises after step 3:

performing sand blasting treatment on at least a magnetic conductive metal layer part on the outer side surface of the inner pot to reach a fourth preset roughness, wherein the fourth preset roughness is 2-12 mu m; and

and forming a protective coating at least covering the magnetic metal layer on the outer side surface of the inner pot.

According to the scheme, the magnetic conductive metal layer can be protected, and the service life is prolonged.

Drawings

The following drawings of embodiments of the invention are included as part of the present invention for an understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings, there is shown in the drawings,

FIG. 1 is a vertical cut-away view of an inner pan according to a preferred embodiment of the present invention;

FIG. 2 is a partial cutaway view of the bottom wall of the inner pot shown in FIG. 1; and

fig. 3 is a flowchart of a method of manufacturing an inner pot according to a first embodiment of the present invention.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the invention.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the invention is not limited to the specific details familiar to those skilled in the art.

The inner pan according to the invention can preferably be applied to electric cooking appliances that are heated by means of electromagnetic induction, but it can of course also be applied to electric cooking appliances that are heated by means of, for example, a heating plate. The electric cooking appliance according to the present invention may be an electric rice cooker, an electric pressure cooker or other electric heating cooker. It should be understood that the electric cooking appliance according to the present invention may have functions of cooking porridge, cooking soup, etc., in addition to the cooking function. For the sake of simplicity, the overall structural schematic diagram of the electric cooking appliance is not shown in the drawing. Hereinafter, the inner pot of the present invention will be described in detail. It should be noted that, as used herein, the directional term "inner" refers to a direction toward the inside of the inner pot, and "outer" refers to a direction away from the inside of the inner pot.

As shown in fig. 1, the inner pot 100 is surrounded by pot walls and is formed with a top opening at the top thereof. The pan wall comprises a side wall 111, a bottom wall 112 and a connecting wall 113. Wherein the side wall 111 is substantially cylindrical and extends vertically, forming a top opening at the top. The bottom wall 112 is generally circular and extends laterally. The connecting wall 113 connects the side wall 111 and the bottom wall 112 and is smoothly transited. The side wall 111, the bottom wall 112 and the connecting wall 113 together enclose the inner pot 100 with a cavity. In some instances, the sidewall 111 may be generally cylindrical, i.e., the sidewall is substantially straight in the height direction. However, the sidewall 111 may be configured to have a substantially spherical shape, i.e., the sidewall 111 is convex outward in the middle in the height direction, and the sidewall 111 and the bottom wall 112 have a curved transition therebetween. The top of the side wall 111 may be formed with an outwardly extending flange to facilitate the user's handling of the inner pot 100.

Specifically, the base material of the inner pot 100 according to the present invention is ceramic, i.e., the ceramic body 114 shown in fig. 2. The ceramic body 114 is mainly a ceramic biscuit, and can be formed by firing raw materials mixed in a predetermined ratio, for example, kaolin, spodumene, other special ores, and the like. Compared with an inner pot made of pure metal materials, the inner pot made of the ceramic base material has certain air permeability and relatively poor heat conductivity, so that the heat storage capacity is better, and the heat insulation performance is excellent. The above characteristics can have a beneficial effect in the process of cooking rice, stew, etc.

As shown in fig. 2, a magnetically conductive metal layer 115 is provided on the outer side surface of the inner pan 100 at least at the location of the bottom wall 112. The magnetically conductive metal layer 115 is made of a material that can generate electromagnetic induction, such as a ferromagnetic material or silver-aluminum alloy, and is closely attached to the ceramic body 114. In one embodiment, the magnetically permeable metal layer 115 may be made of silver-aluminum alloy. This allows for a compromise between electromagnetic induction properties and properties associated with the ceramic body 114. Therefore, the inner pot 100 can be arranged above the electromagnetic induction heating device, the magnetic conductive metal layer 115 generates heat in an electromagnetic induction mode, and then the heat is transferred to the ceramic body 114, so that the food is heated or kept warm.

The magnetically permeable metal layer 115 may be applied to the surface of the ceramic body 114 using a spray process. The thickness of the magnetic conductive metal layer 115 can be set to 0.1-0.3 mm. Therefore, the effect of electromagnetic induction heating of the magnetic metal layer 115 can be ensured, and the thickness is moderate. In one embodiment, the thickness of the magnetically permeable metal layer 115 may be 0.2 mm.

It can be understood that the heating device is generally configured to heat the inner pot 100 from below, and therefore, only the magnetic conductive metal layer 115 needs to be disposed on the outer side surface of the inner pot 100 facing the heating device, and the magnetic conductive metal layer 115 does not need to be disposed on all the outer side surfaces, thereby avoiding increasing unnecessary cost. As shown in fig. 1, in the present embodiment, the ceramic main body 114 is provided with the magnetic conductive metal layer 115 on the outer surface of the pot wall constituting the bottom wall 112 and the connecting wall 113, but is not provided on the outer surface of the pot wall constituting the side wall 111.

Prior to the fusion firing of the magnetically permeable metal layer 115 to the surface of the ceramic body 114, the outer surface of the ceramic body 114 may be grit blasted to increase the roughness of the surface. Therefore, the magnetic metal layer 115 and the ceramic body 114 can be better attached, the bonding strength between the two is increased, and the service life of the inner pot 100 is prolonged. Experiments prove that when the roughness of the outer side surface of the ceramic body 114 is 8-12 μm, the bonding strength between the magnetic conductive metal layer 115 and the ceramic body 114 can meet the use requirement. In one embodiment, the roughness may be selected to be 9 μm or 10 μm.

Preferably, the inner side surface of the ceramic body 114 of the inner pot 100 is provided with a metal layer 117. Specifically, the metal layer 117 may be a magnetically conductive metal layer or a thermally conductive metal layer, as desired. Wherein, the heat conduction metal layer makes the inner pot 100 whose base material is ceramic also can adopt the mode heating of electromagnetic induction, improves heating efficiency. The heat conducting metal layer can increase the heat conducting efficiency inside the inner pot 100, so that the inner pot 100 can reach a uniform temperature state quickly, and the optimization of the cooking process is facilitated.

The magnetic conductive metal layer is made of a material capable of generating electromagnetic induction, such as a ferromagnetic material or a silver-aluminum alloy. In one embodiment, the magnetic conductive metal layer may be made of silver-aluminum alloy. Thus, the electromagnetic induction performance and the performance of combining with the pot wall can be considered at the same time. The heat-conducting metal layer can be made of aluminum, copper, nickel, chromium or tin with better heat-conducting property.

The metal layer 117 is provided on the inner surface of the ceramic body 114 by thermal spraying. The inside surface of the ceramic body 114 may also be grit blasted prior to firing to increase the roughness of the surface, thereby increasing the bond strength of the metal layer 117 to the ceramic body 114. Experiments prove that when the roughness of the inner side surface of the ceramic body 114 is 2-12 μm, the bonding strength between the metal layer 117 and the ceramic body 114 can meet the use requirements. In one embodiment, the roughness may be selected from 3 μm, 5 μm, 7 μm, 8 μm, 9 μm, 11 μm, or the like.

Alternatively, the metal layer 117 may not be provided, and a glaze layer may be provided on the inner surface of the ceramic body 114. The glaze layer may be attached to the inner side surface of the ceramic body 114 by means of spraying or dipping and then sintering at a high temperature to increase the mechanical strength and thermal stability of the inner pot 100, and also to make the inner side surface of the inner pot 100 smooth and easy to clean.

With continued reference to fig. 1 and 2, a protective coating 116 is also provided on the wall of the inner pan 100. The protective coating 116 is located on the outermost side of the pan wall. Specifically, at the positions of the bottom wall 112 and the connecting wall 113, the protective coating 116 is provided on the outer side surface of the magnetically conductive metal layer 115, and at the positions of the side walls 111, the protective coating 116 is provided on the outer side surface of the ceramic body 114. The protective coating 116 can be made of high-strength and wear-resistant materials such as silicone resin or fluororesin, so that the ceramic body 114 and the magnetic conductive metal layer 115 are protected by the protective coating with good rust-proof, corrosion-resistant and wear-resistant properties. The durability of the inner pot 100 can be improved, and the service life can be prolonged.

To increase the bond strength between the protective coating 116 and the outside surface of the pot wall, the outside surface of the pot wall (particularly the outside surface of the magnetically permeable metal layer 115) may be grit blasted to increase roughness prior to spraying the protective coating 116. Tests prove that when the roughness of the outer side surface of the pot wall is 2-12 μm, the bonding strength between the pot wall and the protective coating 116 can meet the use requirement. In one embodiment, the roughness may be selected from 3 μm, 5 μm, 7 μm, 8 μm, 9 μm or 11 μm.

It is further preferable that a non-stick coating 118 is further sprayed on the inner surface of the pot wall (i.e. the inner surface of the glaze layer or the metal layer 117 located inside the pot wall) to achieve a non-stick function, which is convenient for use. And the inside surface of the pan wall is grit blasted to increase roughness prior to spraying the non-stick coating 118. Tests prove that when the roughness of the inner side surface of the pot wall is 2-6 μm, the bonding strength between the non-stick coating 118 and the pot wall can meet the use requirement. In one embodiment, the roughness may be selected to be 3 μm, 4 μm or 5 μm.

A method of manufacturing an inner pan for an electric cooking appliance according to a first embodiment of the present invention will be described with reference to fig. 3:

firstly, step 1, a ceramic material is used for forming a body structure of the inner pot.

Specifically, in step 1, the following procedures may be included in sequence: firstly, argil, spodumene, other special ores (different in various ore components according to different requirements on an inner pot) and the like are stirred and refined into mud through special equipment, and the mud is divided into columnar mud blocks (a mud forming step); secondly, putting the clay into a gypsum mold, and spinning or extruding to form a required shape of the pot liner (molding step); then, redundant die parting flash and edge trimming are carried out on the formed pot liner (blank trimming step); then the inner pot is put on a wind room or a flat ground, and is dried in the air, so that the water in the greenware is reduced (air drying step); polishing and finishing the surface of the greenware to make the surface more exquisite, the appearance more beautiful and the size more accurate (the step of grinding the greenware); air drying in the air room again to reduce the moisture in the ceramic blank so as to reduce the moisture during sintering; carrying out high-temperature sintering (about 800 ℃ above) on the inner pot, wherein the sintering refers to a densification process (bisque sintering step) of reducing the surface area of a blank, reducing the porosity and improving the mechanical property under the high-temperature condition; then the size of the inner pot is checked, and the ceramic blank with qualified size is selected to perform the subsequent steps.

Preferably, after step 1, a glaze layer may be applied to the inner surface of the greenware by spraying glaze or dipping glaze, and then sintered at a high temperature of 1000 ℃ or higher to crystallize the glaze layer at a high temperature.

Step 2 may then be performed to blast the greenware to a first predetermined roughness at predetermined locations on the outside surface thereof. The predetermined position is a position where a magnetically conductive metal layer needs to be disposed. The first predetermined roughness is 8-12 μm, for example 9 μm or 10 μm. After the sand blasting treatment, the inner pot is cleaned and dried to remove oil stains, dust, soft layers and the like on the surface, so that the subsequent treatment is facilitated.

And then, step 3 is carried out, and a magnetic conductive metal layer is formed on the outer side surface of the ceramic blank processed in the step 2. A magnetically conductive material capable of generating electromagnetic induction, such as a ferromagnetic material, a silver-aluminum alloy or silver, is sprayed to a predetermined position of the outer side surface of the ceramic body of the inner pot using a spraying device to form a magnetically conductive metal layer. In the present embodiment, the predetermined position is an outer side surface of the bottom wall and the connecting wall. Therefore, in the above step 2, only the outer side surfaces of the bottom wall and the connecting wall may be subjected to the blasting treatment. Preferably, the thickness of the magnetic conductive metal layer can be 0.1-0.3 mm.

After the above steps, the non-stick coating may be formed by internal spraying. And carrying out sand blasting treatment on the inner side surface of the glaze layer to enable the inner side surface to reach a third preset roughness. The third predetermined roughness is 2-6 μm, which may be 3 μm, 4 μm or 5 μm depending on the process requirements. After the sand blasting treatment, the inner pot is cleaned and dried to remove oil stain, dust, soft layers and the like on the surface, and the risk that the attached coating falls off and peels off is reduced. Then forming a non-stick coating on the inner surface of the glaze layer of the pot wall. The non-stick coating is attached to the inner side surface of the glaze layer on the inner side surface of the pot wall in a cold spraying mode, and then the non-stick coating and the glaze layer are tightly combined through high-temperature sintering, so that the non-stick function is realized.

Or the protective coating can be formed by external spraying, and the protective coating is formed on the outermost side of the pot wall. And (3) performing sand blasting treatment on at least the magnetic conductive metal layer part on the outer side surface of the pot wall to enable the magnetic conductive metal layer part to reach a fourth preset roughness, refining the surface of the magnetic conductive metal layer after the meltallizing treatment so as to increase the fineness of the magnetic conductive metal layer, and removing an oxide layer on the surface of the meltallizing metal layer. The fourth predetermined roughness is approximately 2-12 μm. The roughness may be 3 μm, 5 μm, 7 μm, 8 μm, 9 μm or 11 μm depending on the appearance and the requirements of subsequent processing. Then wear-resistant paint such as silicon resin or fluororesin is attached to the outer side surface of the pot wall in a cold spraying mode. And the high-temperature sintering is adopted to enable the high-temperature sintering to be well attached to the outer side of the pot wall, so that the protection effect is achieved, the performances of rust prevention, corrosion prevention and wear resistance of the inner pot are enhanced, and the service life of the inner pot is prolonged. The protective coating material should cover at least the outer surface of the magnetically permeable metal layer. In this embodiment, the protective coating covers the entire outside surface of the pot wall.

It should be understood that the above embodiment is only one embodiment of manufacturing the inner pot, and various steps are not necessary, and one or more steps may be added or reduced according to the requirement; in addition, the sequence of each step is not necessarily fixed, and the sequence of operations can be adjusted according to requirements. For example, the order of the inner and outer spray steps may be reversed.

Other preferred embodiments according to the present invention will be briefly described below, it being noted that other embodiments to be described below are substantially the same as the above-described embodiments, and therefore, only the differences will be described for the sake of brevity.

In the second embodiment, unlike the first embodiment in which the glaze layer is provided on the inner surface of the greenware, the present embodiment provides a metal layer on the inner surface of the greenware and the non-stick coating layer on the inner surface of the metal layer. The metal layer may be a magnetically conductive metal layer or a thermally conductive metal layer.

After step 1, the inside surface of the greenware is sandblasted to a second predetermined roughness. The second predetermined roughness is 2-12 μm, and may be 3 μm, 5 μm, 7 μm, 8 μm, 9 μm, or 11 μm in consideration of process conditions and subsequent use environments. After the sand blasting treatment, the inner pot is cleaned and dried to remove oil stains, dust, soft layers and the like on the treated surface, so that the subsequent treatment is facilitated. Then, a metal layer is formed on the inner surface of the greenware, and a magnetic conductive material capable of generating electromagnetic induction, such as a ferromagnetic material, a silver-aluminum alloy, or silver, or a metal material having good thermal conductivity, such as aluminum, copper, nickel, chromium, or tin, is melted to a predetermined position on the inner surface of the greenware using a melting apparatus to form the metal layer.

The processing sequence of the magnetic conductive metal layer on the outer side surface and the metal layer on the inner side surface of the greenware is not fixed, and the specific sequence can be reasonably arranged according to the requirements of production procedures.

According to another aspect of the present invention, there is also provided an electric cooking appliance. The electric cooking appliance comprises the inner pot, wherein the magnetic conductive metal layer is arranged on the surface of the outer side of the ceramic body. Due to the existence of the magnetic conductive metal layer, the electric cooking appliance can adopt the electromagnetic induction heating device to heat the inner pot.

The inner pot for the electric cooking appliance comprises the ceramic body and the magnetic conductive metal layer, the ceramic body can enable the heat preservation effect of the inner pot to be better, and rice in the inner pot can be soft and the temperature is more uniform. The magnetic conductive metal layer can realize electromagnetic induction heating. In addition, the proper roughness is arranged on the outer side surface of the ceramic body, so that the bonding strength of the ceramic body and the magnetic conduction metal layer can be enhanced, the ceramic body and the magnetic conduction metal layer are tightly attached, and the service life of the inner pot is prolonged.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "disposed" and the like, appearing herein, may mean either that one element is directly attached to another element, or that one element is attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the invention, which fall within the scope of the invention as claimed.

Claims (11)

1. An inner pot for an electric cooking appliance, characterized in that the inner pot comprises a ceramic body with an opening formed at the top, a magnetic conductive metal layer is at least partially thermally sprayed on the outer surface of the ceramic body, the roughness of the outer surface of the ceramic body is 9-12 μm, the magnetic conductive metal layer is made of silver-aluminum alloy so as to take electromagnetic induction performance and performance of combination with the ceramic body into consideration, and the thickness of the magnetic conductive metal layer is 0.1-0.2 mm;

the outer side surface of the inner pot is provided with a protective coating, the protective coating at least covers the magnetic conductive metal layer, and the roughness of the outer side surface of the magnetic conductive metal layer combined with the protective coating is 2-12 mu m.

2. Inner pot according to claim 1, characterised in that the ceramic body is at least partly heat-fused with a metal layer on its inner side surface, the roughness of the inner side surface being 2-12 μm.

3. The inner pan of claim 2, wherein the metal layer is a magnetically conductive metal layer or a thermally conductive metal layer.

4. Inner pot according to claim 1, characterized in that the inner side surface of the ceramic body is provided with a glaze layer.

5. Inner pot according to claim 2 or 4, characterized in that the inner side surface of the inner pot is provided with a non-stick coating.

6. The inner pan of claim 5, wherein an inside surface of the inner pan bonded to the non-stick coating has a roughness of 2-6 μm.

7. Electric cooking appliance, characterized in that it comprises an inner pot according to any one of claims 1-6.

8. A method of manufacturing the inner pan of claim 1, characterized in that the method comprises the steps of:

step 1, forming a body structure of an inner pot by using a ceramic material;

step 2, carrying out sand blasting treatment on a preset position of the outer side surface of the ceramic body of the inner pot to reach a first preset roughness, wherein the first preset roughness is 9-12 microns; and

step 3, performing hot-melt spraying on the silver-aluminum alloy at the preset position on the outer side surface of the ceramic body to form a magnetic conductive metal layer with the thickness of 0.1-0.2 mm;

and 4, performing sand blasting treatment on at least the part of the magnetic conductive metal layer on the outer side surface of the inner pot to reach a fourth preset roughness, wherein the fourth preset roughness is 2-12 mu m, and forming a protective coating at least covering the magnetic conductive metal layer on the outer side surface of the inner pot.

9. The method of claim 8, further comprising, after step 1:

performing sand blasting on a preset position of the inner side surface of the ceramic body of the inner pot to reach a second preset roughness, wherein the second preset roughness is 2-12 mu m; and

and hot-melt spraying a metal layer at the predetermined position on the inner side surface of the ceramic body.

10. The method of claim 8, further comprising forming a glaze layer on an inside surface of the ceramic body of the inner pot after step 1.

11. The method according to claim 9 or 10, characterized in that the method further comprises:

performing sand blasting on the inner side surface of the inner pan to reach a third predetermined roughness, wherein the third predetermined roughness is 2-6 μm; and

and forming a non-stick coating on the inner side surface of the inner pot.

Images