CN209826334U

CN209826334U - Inner pot and cooking utensil with same

Info

Publication number: CN209826334U
Application number: CN201920424541.5U
Authority: CN
Inventors: 何国营; 杜征峥
Original assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Current assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2019-12-24
Anticipated expiration: 2029-03-29

Abstract

The utility model provides an interior pot and have its cooking utensil, wherein, interior pot, include: the metal outer layer is in a revolving body shape and comprises a curved outer layer main body and an outer layer bottom wall positioned at the bottom of the curved outer layer main body, and the outer layer bottom wall is a plane part, wherein the maximum radial dimension D of the plane part is larger than 0 and less than or equal to 60 mm; the nonmetal inner layer is embedded and sleeved in the metal outer layer, and the outer surface of the nonmetal inner layer is matched and connected with the inner surface of the metal outer layer. The technical scheme of the application effectively solves the problem that the bonding firmness of the metal and nonmetal composite liner is poor in the related technology.

Description

Inner pot and cooking utensil with same

Technical Field

The utility model relates to a small household appliances technical field particularly, relates to an interior pot and have its cooking utensil.

Background

In the related art, the cooking utensil comprises an inner container, and the inner container is mostly a metal inner container or a non-metal inner container. The inner container of the electric cooker or the electric pressure cooker is generally a metal inner container; the inner container of the electric stewpan is generally a non-metal inner container. Wherein, the metal inner container has good heat conduction but not good heat storage, and the nonmetal inner container has good heat storage but not good heat conduction.

In order to solve the above problems, the related art discloses a metal stone pot, which is formed by fixedly connecting an inner pot body made of natural stone and an outer pot body made of metal material, wherein the outer pot body is coated on the outer surface of the inner pot body made of natural stone.

The inventor finds that the metal stone pot has poor bonding firmness and is easy to delaminate or collapse when in use.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides an interior pot and have its cooking utensil to solve the poor problem of the bonding firmness of the nonmetal compound inner bag of metal among the correlation technique.

In order to achieve the above object, according to an aspect of the present invention, there is provided an inner pot, comprising: the metal outer layer is in a revolving body shape and comprises a curved outer layer main body and an outer layer bottom wall positioned at the bottom of the curved outer layer main body, and the outer layer bottom wall is a plane part, wherein the maximum radial dimension D of the plane part is larger than 0 and less than or equal to 60 mm; the nonmetal inner layer is embedded and sleeved in the metal outer layer, and the outer surface of the nonmetal inner layer is matched and connected with the inner surface of the metal outer layer.

Use the technical scheme of the utility model, interior pot includes non-metallic inner layer and metal skin. The metal outer layer is the solid of revolution shape, and the metal outer layer includes the outer main part of curved surface and is located the outer diapire of the outer main part bottom of curved surface, and outer diapire is plane portion, and wherein, the biggest radial dimension D of plane portion is greater than 0 and less than or equal to 60 mm. The nonmetal inner layer is embedded in the metal outer layer, and the outer surface of the nonmetal inner layer is matched and connected with the inner surface of the metal outer layer. In this application, plane portion's maximum radial dimension D is greater than 0 and less than or equal to 60mm, and like this, plane portion can conveniently cooperate with other structures, for example the temperature sensing device, and simultaneously, plane portion's size is less for the size of the plane faying face between the surface of nonmetal inlayer and the outer internal surface of metal is less. Compared with a larger plane joint surface in the related technology, the size of the plane joint surface is greatly reduced in the technical scheme of the application, so that the inner pot is not easy to deform and crack in the heating process. Therefore, the technical scheme of the application effectively solves the problem of poor bonding firmness of the metal and nonmetal composite liner in the related art.

Further, the metal outer layer rotary bus comprises a curve section for forming the outer layer side wall, the curve section is an arc section, and the curve section protrudes outwards. The structure can offset partial acting force at the joint of the non-metal inner layer and the metal outer layer.

Further, the maximum radial dimension D of the flat surface portion is greater than 0 and equal to or less than 30 mm. The structure avoids the deformation and cracking of the inner pot in the heating process.

Further, the maximum radial dimension D of the planar portion is 15mm or 30 mm. The size can ensure that the inner pot is not easy to delaminate or collapse.

Further, the nonmetal inlayer includes inlayer diapire and inlayer lateral wall, and the thickness of inlayer diapire is greater than the thickness of inlayer lateral wall, and the internal surface of inlayer diapire and the internal surface of inlayer lateral wall are smooth surface, smooth transition between the internal surface of inlayer diapire and the internal surface of inlayer lateral wall. During cooking, the food materials can be driven to roll by the structure, and the food materials are stirred.

Further, the nonmetal inlayer includes inlayer diapire and inlayer lateral wall, and the thickness of the corresponding part of inlayer diapire and plane portion reduces from the center to the border gradually. During cooking, the food materials can be driven to roll by the structure, and the food materials are stirred.

Further, the nonmetal inner layer comprises an inner layer bottom wall and an inner layer side wall, the thickness of the inner layer bottom wall is between 2mm and 8mm, and the thickness of the inner layer side wall is between 2mm and 6 mm. The thickness makes the bubbles more likely to float up during cooking.

Furthermore, the non-metal inner layer is made of medical stone or selenium-rich stone. The materials are easy for human health.

Furthermore, the rotary bus of the metal outer layer comprises a curve section for forming the side wall of the outer layer, the curve section is an arc section, and the curve section protrudes outwards; the maximum radial dimension D of the plane part is more than 0 and less than or equal to 30 mm; the maximum radial dimension D of the plane part is 15mm or 30 mm; the nonmetal inner layer comprises an inner layer bottom wall and an inner layer side wall, the thickness of the inner layer bottom wall is larger than that of the inner layer side wall, the inner surface of the inner layer bottom wall and the inner surface of the inner layer side wall are both smooth surfaces, and the inner surface of the inner layer bottom wall and the inner surface of the inner layer side wall are in smooth transition; the nonmetal inner layer comprises an inner layer bottom wall and an inner layer side wall, and the thickness of the part, corresponding to the plane part, of the inner layer bottom wall is gradually reduced from the center to the edge; the nonmetal inner layer comprises an inner layer bottom wall and an inner layer side wall, the thickness of the inner layer bottom wall is between 2mm and 8mm, and the thickness of the inner layer side wall is between 2mm and 6 mm; the nonmetal inner layer is made of medical stone or selenium-rich stone.

According to another aspect of the present invention, there is provided a cooking utensil, comprising an inner pot, wherein the inner pot is the above inner pot. The cooking utensil can effectively solve the problem of poor bonding firmness of the metal and nonmetal composite inner container in the related art.

Furthermore, the cooking appliance is an electric pressure cooker, the electric pressure cooker also comprises a shell and a heat preservation cover arranged in the shell, and the inner pot is arranged in the heat preservation cover in a removable way. The structure is convenient for the inner pot to be placed in the heat preservation cover.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic cross-sectional view of an embodiment of an inner pan according to the invention; and

fig. 2 shows a schematic view of air bubbles and water flow generated when the inner pot of fig. 1 cooks.

Wherein the figures include the following reference numerals:

10. a non-metallic inner layer; 11. an inner layer bottom wall; 12. an inner layer sidewall; 20. a metal outer layer; 21. an outer bottom wall; 22. and an outer layer side wall.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The inventor finds that the nonmetal composite liner in the related technology is easy to deform and crack in the heating process. It was analyzed that the reason is that a large plane bonding surface exists between the metal outer layer and the non-metal inner layer in the related art. Because the natural stone and the metal material have different expansion coefficients, the plane joint surface is easy to deform and crack. Because the forces in the curved surface structure are mutually offset, compared with a plane part, the curved surface structure is not easy to deform and crack.

If set the whole interior pot to the segment form, can make the poor stability of interior pot, simultaneously, the faying face of interior pot bottom and temperature sensing device can dwindle greatly.

Based on the above circumstances, the present application provides an inner pot, as shown in fig. 1 and 2, an inner pot according to an embodiment of the present application includes: a non-metallic inner layer 10 and a metallic outer layer 20. The outer layer 20 of metal is the solid of revolution, and the outer layer 20 of metal includes the outer layer main part of curved surface and is located the outer diapire 21 of the outer layer main part bottom of curved surface and be plane portion, and wherein, the biggest radial dimension D of plane portion is greater than 0 and less than or equal to 60 mm. The non-metal inner layer 10 is embedded in the metal outer layer 20, and the outer surface of the non-metal inner layer 10 is matched and connected with the inner surface of the metal outer layer 20.

By applying the technical scheme of the embodiment, the inner pot comprises a non-metal inner layer 10 and a metal outer layer 20. The non-metal inner layer 10 is embedded in the metal outer layer 20, and the outer surface of the non-metal inner layer 10 is matched and connected with the inner surface of the metal outer layer 20. In this embodiment, the maximum radial dimension D of the planar portion is greater than 0 and less than or equal to 60mm, so that the planar portion can be conveniently matched with other structures, such as a temperature sensing device, and meanwhile, the size of the planar portion is small, so that the size of a planar joint surface between the outer surface of the non-metal inner layer 10 and the inner surface of the metal outer layer 20 is small. Compared with a larger plane joint surface in the related technology, the technical scheme of the embodiment greatly reduces the size of the plane joint surface, so that the inner pot is not easy to deform and crack in the heating process. Therefore, the technical scheme of the application effectively solves the problem of poor bonding firmness of the metal and nonmetal composite liner in the related art.

In the embodiment, the flat portion has a circular structure, and the diameter D of the flat portion is greater than 0 and equal to or less than 60 mm. The values are obtained through a series of experiments of the inventor. The experimental details are as follows:

first, Experimental conditions

Step one, adding 80% of oil-water with rated capacity into an inner pot to simulate a normal cooking state, wherein 1000g of oil-water contains 50g of edible oil, 50g of soy sauce, 20g of salt and 20g of vinegar, starting a rice cooking function to work for 45 minutes, stopping the work for 15 minutes to form a cycle, and testing for 100 cycles;

step two, no water and any food in the inner pot imitate a dry-cooking state, the inner pot is started to work for 100 cycles, and the inner pot is in a cooking function mode.

Second, experimental results

Diameter of plane part mm	Number of samples	Cracking of cooking oil water	Cracking of empty pot
				15	10	0	0
30	10	0	1
				45	10	0	1
60	10	0	1
				65	10	1	1
70	10	1	1
				80	10	1	2
90	10	2	3

From the above experiments it can be derived that: the diameter D of the plane part is more than 0 and less than or equal to 60mm, and the inner pot does not crack when the inner pot is used for cooking oil and water; when the inner pot is an empty pot, the inner pot cracks when the diameter D is larger than 30 mm. In the case that the diameter D of the flat portion exceeds 60mm, the inner pot may be cracked when the inner pot is boiled with oil or water.

In summary, it is found through the above analysis that the inner pot is more likely to crack when the diameter D of the flat portion exceeds 60mm, and the inner pot is less likely to crack when the diameter D of the flat portion is within a range of more than 0 and 60mm or less. The diameter D of the plane part is in a range of more than 0 and less than or equal to 60mm, and the situation of bulging and cracking can not occur at the joint between the metal outer layer and the nonmetal inner layer in a normal cooking state.

In other embodiments not shown in the figures, the planar portion may be an elliptical structure, the maximum radial dimension of the ellipse being the dimension of the major axis, which needs to be greater than 0 and equal to or less than 60 mm.

It should be noted that: the inside and outside directions of the non-metal inner layer 10 and the inside and outside directions of the metal outer layer 20 in this embodiment are directions from the inside of the inner pot to the outside of the inner pot, and specifically refer to directions shown by arrows in fig. 1 and fig. 2. The material of the metal outer layer is preferably aluminum or iron. The metal outer layer is preferably a cast metal outer layer. The metal outer layer is mainly formed by a stamping processing method. Furthermore, the non-metallic inner layer 10 and the metallic outer layer 20 are preferably connected together by means of die casting.

In addition, the bonding surface between the non-metal inner layer 10 and the metal outer layer 20 of this embodiment at the outer main body of curved surface is curved surface shape, and the curved surface shape can offset partial acting force when the non-metal inner layer 10 is connected with the metal outer layer 20, and the problem that the inner pot drops or bursts is avoided.

As shown in fig. 1, in the present embodiment, the diameter D of the planar portion is greater than 0 and less than or equal to 30mm, and the size of the planar bonding surface is further reduced by the above size, so as to effectively avoid the deformation and cracking of the inner pot during the heating process.

As shown in fig. 1, the rotation generatrix of the metal outer layer 20 includes a curved section for forming the outer layer side wall 22, the curved section being an arc-shaped section, the curved section being outwardly convex. The curved section in this embodiment is protruded outward, which means that the diameter of the middle of the outer layer side wall 22 is larger than the diameter of the connection of the outer layer side wall 22 and the opening of the non-metallic inner layer 10, so that the outer layer side wall 22 takes a shape that is higher in the middle and lower in both ends. Thus, the outer side wall 22 is curved as a whole, and the curved shape can offset part of the acting force at the joint of the non-metal inner layer 10 and the metal outer layer 20, thereby improving the bonding force between the outer surface of the non-metal inner layer 10 and the inner surface of the metal outer layer 20 at the position of the outer side wall 22. Meanwhile, the larger the area of the curved surface is, the smaller the area of the planar portion is, which is more advantageous for the connection between the outer surface of the non-metal inner layer 10 and the inner surface of the metal outer layer 20.

As shown in fig. 1, in order to sufficiently ensure that the outer surface of the non-metal inner layer 10 and the inner surface of the metal outer layer 20 are not easily delaminated or chipped at the flat surface portion when the flat surface portion is heated, the diameter D of the flat surface portion is 15mm or 30 mm.

As shown in fig. 1 and 2, the non-metal inner layer 10 includes an inner layer bottom wall 11 and an inner layer side wall 12, the thickness of the inner layer bottom wall 11 is greater than that of the inner layer side wall 12, and both the inner surface of the inner layer bottom wall 11 and the inner surface of the inner layer side wall 12 are smooth surfaces. The inner surface of the inner bottom wall 11 and the inner surface of the inner side wall 12 are smoothly transitioned. Thus, when cooking, the inner bottom wall 11 is thicker and can store more heat, and a large amount of bubbles are generated on the inner wall of the inner bottom wall 11. Under the condition of generating bubble on inlayer diapire 11, inlayer diapire 11 can drive and eat the material and roll, and the stirring is eaten the material, and it is more even to make food be heated, and the bubble can rebound, and like this, the bubble is the come-up more easily, and the bubble can not be long-time attached to on the internal surface of inlayer diapire 11, has strengthened the effect of stirring.

It should be noted that: the smooth transition means that the uneven convex structure or concave structure is not seen at the joint of the inner surface of the inner bottom wall 11 and the inner surface of the inner side wall 12 by naked eyes, and the inner surface of the non-metal inner layer 10 is smooth when being touched by a user with hands.

In this embodiment, the thickness of the inner-layer side wall 12 may gradually decrease along the direction of the rotation generatrix, and the thickness of the inner-layer side wall 12 may also be equal everywhere. As long as the thickness of the thickest part of the inner side wall 12 is less than or equal to the thickness of the thinnest part of the inner bottom wall 11, the inner bottom wall 11 can drive the food materials to roll, the food materials are stirred, and the food is heated more uniformly.

Preferably, the non-metallic inner layer 10 includes an inner layer bottom wall 11 and an inner layer side wall 12. The thickness T1 at the axis of the inner layer bottom wall 11 is gradually reduced to the thickness T2 at the junction of the outer layer side wall 22 and the opening of the non-metallic inner layer 10. Like this, when cooking, the bubble floats more easily on the one hand, and inlayer diapire 11 can drive to eat the material and roll, stirs the material of eating, makes food be heated more evenly, and the bubble can not be long-time attached to on the internal surface of inlayer diapire 11, has strengthened the effect of stirring. On the other hand, the thickness is gradually reduced, so that the heat transfer, heat conduction and heat storage effects of the non-metal inner layer 10 are good, and the inner pot is not easy to break.

As shown in fig. 1 and 2, the non-metal inner layer 10 includes an inner layer bottom wall 11 and an inner layer side wall 12, and the thickness of a portion of the inner layer bottom wall 11 corresponding to the planar portion is gradually reduced from the center to the edge. Thus, the inner bottom wall 11 is thick during cooking, and can store a large amount of heat. And the thickness is gradually reduced, so that the heat transfer, heat conduction and heat storage effects of the non-metal inner layer 10 are good, and the inner pot is not easy to break.

As shown in fig. 1 and 2, the non-metal inner layer 10 comprises an inner layer bottom wall 11 and an inner layer side wall 12, the thickness of the inner layer bottom wall 11 is between 2mm and 8mm, and the thickness of the inner layer side wall 12 is between 2mm and 6 mm. Like this, when cooking, under the condition of producing the bubble on inlayer bottom wall 11, the bubble can the rebound, and like this, the bubble is more easy come-up, and the bubble can not be long-time attached to on the internal surface of inlayer bottom wall 11, has strengthened the effect of stirring, and then the culinary art effect is better.

In the present embodiment, the thickness of the metal outer layer 20 is between 1mm and 6mm, and the above thickness makes the non-metal inner layer 10 inside the metal outer layer 20 easy to be heated.

As shown in fig. 1 and 2, in order that the non-metal inner layer 10 is easy to be healthy, the non-metal inner layer 10 is made of medical stone or selenium-rich stone.

As shown in fig. 1, a first contact portion is formed at an end of the non-metal inner layer 10, and a second contact portion contacting and cooperating with the first contact portion is formed on an inner wall of the metal outer layer 20. Therefore, the first contact part and the second contact part are in surface-to-surface contact, so that the non-metal inner layer 10 and the metal outer layer 20 are combined more tightly, and the problem of cracking of the inner pot is further prevented.

The application also provides a cooking utensil, and the cooking utensil of this embodiment includes interior pot, interior pot is the aforesaid interior pot. The cooking utensil of this embodiment can effectively solve the poor problem of the bonding firmness of metal nonmetal compound inner bag among the correlation technique.

In this embodiment, the cooking appliance is an electric pressure cooker, the electric pressure cooker further includes a housing and a heat-insulating cover disposed in the housing, and the inner pot is removably disposed in the heat-insulating cover. Cooking utensil is still including being located the heating device of pot bottom in, and the cover that keeps warm like this can preserve heating device's heat, and the heating device of being convenient for heats interior pot, and the pot is placed in the cover that keeps warm in being convenient for. Of course, in other embodiments not shown, the cooking appliance may also be an electric cooker, a low-pressure rice cooker, a soymilk maker, a food processor, an electric stewpan, or the like.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An inner pan, comprising:

the metal outer layer (20) is in a shape of a solid, the metal outer layer (20) comprises a curved outer layer main body and an outer layer bottom wall (21) positioned at the bottom of the curved outer layer main body, the outer layer bottom wall (21) is a plane part, and the maximum radial dimension D of the plane part is larger than 0 and less than or equal to 60 mm;

the nonmetal inner layer (10) is embedded in the metal outer layer (20), and the outer surface of the nonmetal inner layer (10) is matched and connected with the inner surface of the metal outer layer (20).

2. Inner pot according to claim 1, characterised in that the revolution generatrix of the metal outer layer (20) comprises a curved section for forming the outer layer side wall (22), said curved section being an arc-shaped section, said curved section being outwardly convex.

3. Inner pan according to claim 1, characterized in that the largest radial dimension D of the planar portion is larger than 0 and equal to or smaller than 30 mm.

4. Inner pan according to claim 3, characterized in that the largest radial dimension D of the planar portion is 15mm or 30 mm.

5. Inner pot according to claim 1, characterized in that the non-metallic inner layer (10) comprises an inner layer bottom wall (11) and an inner layer side wall (12), the thickness of the inner layer bottom wall (11) is larger than the thickness of the inner layer side wall (12), the inner surface of the inner layer bottom wall (11) and the inner surface of the inner layer side wall (12) are both smooth surfaces, and the inner surface of the inner layer bottom wall (11) and the inner surface of the inner layer side wall (12) are in smooth transition.

6. Inner pan according to claim 1, characterized in that the non-metallic inner layer (10) comprises an inner layer bottom wall (11) and an inner layer side wall (12), the thickness of the inner layer bottom wall (11) in correspondence of the planar portion decreasing from the centre to the edge.

7. Inner pan according to claim 1, characterized in that the non-metallic inner layer (10) comprises an inner layer bottom wall (11) and an inner layer side wall (12), the thickness of the inner layer bottom wall (11) being between 2mm and 8mm and the thickness of the inner layer side wall (12) being between 2mm and 6 mm.

8. Inner pot according to claim 1, characterized in that the non-metallic inner layer (10) is made of medical stone or selenium-rich stone.

9. Inner pot according to claim 1, characterised in that the revolution generatrix of the metal outer layer (20) comprises a curvilinear section for forming the outer layer side wall (22), said curvilinear section being an arc-shaped section, said curvilinear section being convex outwards; the maximum radial dimension D of the plane part is larger than 0 and less than or equal to 30 mm; the maximum radial dimension D of the plane part is 15mm or 30 mm; the nonmetal inner layer (10) comprises an inner layer bottom wall (11) and an inner layer side wall (12), the thickness of the inner layer bottom wall (11) is larger than that of the inner layer side wall (12), the inner surface of the inner layer bottom wall (11) and the inner surface of the inner layer side wall (12) are both smooth surfaces, and the inner surface of the inner layer bottom wall (11) and the inner surface of the inner layer side wall (12) are in smooth transition; the thickness of the part of the inner-layer bottom wall (11) corresponding to the plane part is gradually reduced from the center to the edge; the thickness of the inner layer bottom wall (11) is between 2mm and 8mm, and the thickness of the inner layer side wall (12) is between 2mm and 6 mm; the nonmetal inner layer (10) is made of medical stone or selenium-rich stone.

10. A cooking appliance comprising an inner pan, the inner pan being as claimed in any one of claims 1 to 9.

11. The cooking appliance of claim 10, wherein the cooking appliance is an electric pressure cooker, the electric pressure cooker further comprising an outer shell and a heat-retaining cover disposed within the outer shell, the inner pot being removably disposed within the heat-retaining cover.