Stove

Abstract

A pan comprising a base, the base comprising: an inner base, the upper surface of which has a first curved surface concave at least in its central region; an outer base connected with a lower surface of the inner base, the lower surface of the outer base having a second curved surface concave at least in its central region; an intercalated layer sandwiched between the inner and outer bases, the intercalated layer having a coefficient of thermal expansion greater than the coefficient of thermal expansion of both the inner and outer bases. Figure for the abbreviation: Figure 1

Description

Title of the invention: Stove

[0001] This application relates to the technical field of kitchen utensils and in particular a frying pan.

[0002] Existing pans can be classified into conventional pans and oil-collecting pans according to the structure of their base. The base of a conventional pan is generally flat or slightly domed upwards. During cooking, the base deforms upwards when heated, causing the oil to disperse towards the periphery of the pan. This makes heat control difficult and ingredients burn easily. An oil-collecting pan generally has a concave inner base. During cooking, the base deforms downwards when heated, forming an outwardly convex base that could cause the pan to rotate on a supporting surface. Thus, existing pans are easily deformed during use and have poor base stability.

[0003] The present invention provides a pan to solve the problem of deformation of the bottom of the pan by improving its stability.

[0004] The present invention provides a pan comprising a base, the base comprising:

[0005] - an inner base, the upper surface of which is provided with a first surface curved and concave, at least in its central region;

[0006] - an outer bottom connected with a lower surface of the inner bottom, a lower surface of the outer bottom being provided with a second curved surface concave at least in its central region;

[0007] - an interlayer sandwiched between the inner base and the outer base, the intercalated layer having a coefficient of thermal expansion greater than the coefficient of thermal expansion of the inner base and the coefficient of thermal expansion of the outer base.

[0008] The base of the pan according to the present invention comprises an inner base, an outer base, and an interlayer. The upper surface of the inner base has a first curved surface that is concave, at least in its central region. This first curved surface helps to collect oil. The outer base is connected to the lower surface of the inner base, and a second curved concave surface is provided, at least in the central region, on the lower surface of the outer base. This second curved surface forms a recess in the central region of the outer base, which prevents the pan from rotating. The interlayer is positioned between the inner and outer bases, and its coefficient of thermal expansion is greater than the coefficient of thermal expansion of both the inner and outer bases, such that the The intermediate layer and the inner base, and the intermediate layer and the outer base, respectively form two bimetallic strips, and the inner and outer bases tend to deform in opposite directions. Thus, the deformation of the inner and outer bases can at least partially compensate for each other, which solves the problem of pan base deformation and improves the stability of the pan base.

[0009] Optionally, the coefficient of thermal expansion of the inner bottom is greater than the coefficient of thermal expansion of the outer bottom. Thus, the deformation tendency of the inner bottom is as close as possible to the deformation tendency of the outer bottom, so that the deformation of the inner bottom and the deformation of the outer bottom compensate each other as much as possible, thereby reducing or eliminating the overall deformation of the bottom of the pan.

[0010] Optionally, the depression depth of the first curved surface is greater than the depression depth of the second curved surface, which ensures a reliable oil collection effect and effectively prevents the pan from rotating.

[0011] Optionally, the depression depth of the first curved surface is Hl, and the depression depth of the second curved surface is H2 such that Hl = y*H2, 3 <y<6. Pour une profondeur de dépression globale du fond de la poêle inchangée, une répartition plus raisonnable des profondeurs des dépressions respectives dans les fonds intérieur et extérieur permet d’assurer un effet fiable de collecte de l'huile et d’empêcher la poêle de tourner à causer d’un fond convexe vers le bas.

[0012] Optionally, the diameter of the outer bottom is Dl, and the thickness of the bottom of the pan at the center is Tl such that Tl = k*Dl, 0.01 <k<0,03, ce qui permet d’empêcher la déformation du fond de la poêle et d’assurer la commodité d’usage.

[0013] Optionally, the thickness of the pan base at the midpoint of the inner base radius is T2 such that T2 = Tl + a*Dl, 0.005 <a<0,01, ce qui permet d’assurer un effet fiable de collecte de l'huile et une distribution uniforme de la chaleur pour améliorer les résultats de cuisson.

[0014] Optionally, the vertical distance between an edge of the upper surface of the inner bottom and an edge of the lower surface of the outer bottom is T3 such that T3 = T2 + |3*D1, 0.007<[3<0.012, which ensures a reliable oil collection effect and uniform heat distribution.

[0015] Optionally, the thickness Tl of the bottom of the pan at the center is greater than or equal to 2.5 mm in order to prevent the thickness of the bottom of the pan at the center from being too small, which would result in the bottom of the pan itself being too small and having insufficient resistance to deformation.

[0016] Optionally, the thickness of the bottom of the pan in the center is such that 2.5 mm <T1<4 mm. Le fond de la poêle doit être aussi fin que possible pour réduire le poids total de la poêle ;

[0017] The thickness of the inner bottom is 0.5 mm to 0.8 mm and the thickness of the outer bottom is 0.5 mm to 0.8 mm, which allows the bottom of the pan to be treated and formed according to predetermined requirements and to be resistant to deformation.

[0018] Optionally, the thickness of the pan base at the center is such that Tl > 4 mm. By adopting a thicker base, it is ensured that the pan base has sufficient resistance to deformation in order to prevent deformation of the pan base;

[0019] The thickness of the inner bottom is from 0.5 mm to 1.2 mm, and the thickness of the outer bottom is from 0.5 mm to 1.2 mm, which allows the bottom of the pan to be treated and formed according to the provided requirements and to be resistant to deformation.

[0020] Note that the general description above and the detailed description that follows are given by way of example and do not limit the present invention. Brief description of the figures

[0021] [Fig.1] is a schematic structural view of a pan provided by an embodiment of the present invention.

[0022] List of references: 1 - inner background; 2 - outer base; 21 - extension; 3 - Interlayer

[0023] The figures, which are incorporated and form part of the description, illustrate embodiments compatible with the present invention and, together with the description, serve to explain the principles of the present invention. Detailed description

[0024] The present invention will be described in more detail below with reference to the figures and embodiments, and the objectives, technical solutions, and advantages of the invention will become clearer. It is understood that the specific embodiments described herein are solely for the purpose of explaining the present invention and are not intended to limit it.

[0025] In the description of this application, unless otherwise explicitly stated or limited, the terms "first" and "second" are used for descriptive purposes only and shall not be construed as indicating or implying relative importance. Unless otherwise stated or described, the term "multiple" means two or more; the terms "connection," "fixed," etc., shall be understood in a broad sense. For example, a "connection" may be a fixed connection, a connection Detachable or integral connection, or electrical connection; it may be direct or indirect via an intermediate medium. For a person skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0026] In the description, it is understood that orientation terms, such as "up" and "down," used in the description of embodiments of the present application are described from the perspective shown in the figures and are not to be interpreted as a limitation of the embodiments of the present invention. Furthermore, it is understood in the context that when an element is said to be connected "on" or "under" another element, it may not only be directly connected "on" or "under" the other element, but may also be indirectly connected "on" or "under" the other element via an intermediate element.

[0027] As illustrated in [Fig. 1], one embodiment of the present invention provides a pan comprising a base and a side that are connected to each other. The base and the side of the pan together form a cavity for holding food. A handle may be provided on the outside of the side of the pan to facilitate gripping and lifting the pan by a user.

[0028] The base of the pan comprises an inner base 1, an outer base 2, and an interlayer 3. The upper surface of the inner base 1 has a first curved surface concave inward (concave downward), at least in its central region. This first curved surface helps to collect oil. The outer base 2 is connected to the lower surface of the inner base 1, and the lower surface of the outer base 2 has a second curved surface concave inward, at least in its central region. This second curved surface forms a recess in the central region of the outer base 2, which prevents the pan from rotating. The interlayer 3 is sandwiched between the inner base 1 and the outer base 2.The coefficient of thermal expansion of the intermediate layer 3 is greater than the coefficient of thermal expansion of the inner base 1 and the coefficient of thermal expansion of the outer base 2, so that the intermediate layer 3 and the inner base 1, and the intermediate layer 3 and the outer base 2, respectively form two bimetallic strips, and the inner base 1 and the outer base 2 tend to deform in opposite directions. Thus, the deformation of the inner base 1 and the deformation of the outer base 2 at least partially compensate each other, which solves the problem of pan base deformation and improves the stability of the pan base.

[0029] More specifically, since the coefficient of thermal expansion of the interlayer 3 is greater than that of the inner base 1, during heating, the deformation of the interlayer 3 is greater than that of the inner base 1, so The intermediate layer 3 and the inner base 1 tend to bend upwards. Similarly, since the coefficient of thermal expansion of the intermediate layer 3 is greater than that of the outer base 2, during heating, the deformation of the intermediate layer 3 is greater than that of the outer base 2, so that the intermediate layer 3 and the outer base 2 tend to bend downwards. Because the inner base 1 and the outer base 2 tend to deform in opposite directions, the deformations of the inner base 1 and the outer base 2 can at least partially compensate for each other. When the deformation of the inner base 1 is greater than that of the outer base 2, the bottom of the pan exhibits an overall upward bend or deformation.In this case, the depression depth of the first curved surface increases slightly, and the depression depth of the second curved surface decreases slightly. When the deformation of the inner bottom 1 is less than that of the outer bottom 2, the bottom of the pan exhibits downward flexing or overall deformation. In this case, the depression depth of the first curved surface decreases slightly, and the depression depth of the second curved surface increases slightly. When the deformation of the inner bottom 1 is equal to that of the outer bottom 2, the bottom of the pan exhibits virtually no overall deformation. In this case, the depression depth of the first curved surface and the depression depth of the second curved surface remain unchanged.

[0030] In this embodiment, the inner bottom 1 is formed by stretching a sheet of metal and can be integrally formed with the pan wall to increase the continuity and integrity of the inner surface of the pan bottom. The outer bottom 2 can also be formed by stretching a sheet of metal. The edge of the outer bottom can be provided with an upward-facing extension 21 connected to the inner bottom 1 by means of the extension 21. A cavity is formed between the outer bottom 2 and the inner bottom 1. The interlayer 3 fills the cavity. Thus, the inner bottom 1, the outer bottom 2, and the interlayer 3 together form a composite bottom of the pan.

[0031] With the coefficient of thermal expansion of the inner bottom 1 greater than that of the outer bottom 2, the deformation tendency of the inner bottom 1 can be as close as possible to the deformation tendency of the outer bottom 2, so that the deformation of the inner bottom 1 and the deformation of the outer bottom 2 compensate each other as much as possible, thus reducing the overall deformation of the pan bottom. More specifically, during heating, the outer bottom 2 is in direct contact with the heat source and transfers heat to the inner bottom 1 through the intercalated layer 3, so that the temperature of the outer bottom 2 is higher than that of the inner bottom 1. If the coefficient of thermal expansion of the inner bottom 1 is equal to that of the outer bottom 2, the deformation tendency of the outer bottom 2 will be significantly more important than that of the inner bottom 1. By choosing a material with a lower coefficient of thermal expansion for the outer bottom 2 which has a higher temperature, and choosing a material with a higher coefficient of thermal expansion for the inner bottom 1 which has a lower temperature, it is possible to make the deformations of the two bottoms more convergent, which makes it possible to reduce or eliminate the overall deformation of the bottom of the pan.

[0032] Specifically, the inner bottom 1 can be made of 316 stainless steel sheet, with a coefficient of thermal expansion of approximately 16 x 10⁶ / °C; the outer bottom 2 can be made of 430 stainless steel sheet, with a coefficient of thermal expansion of approximately 10 x 10⁶ / °C; the intermediate layer 3 can be made of 1050 pure aluminum, with a coefficient of thermal expansion of approximately 23 x 10⁶ / °C. While ensuring reliable oil collection and good resistance to deformation, the use of 316 and 443 stainless steel provides good corrosion resistance. Furthermore, the use of pure aluminum ensures good thermal conductivity and better uniformity of heat distribution. Of course, the inner base 1, the outer base 2 and the intermediate layer 3 can also be made of other suitable materials as required.

[0033] In this embodiment, the depth of the depression in the first curved surface is greater than that in the second curved surface, which ensures reliable oil collection and effectively prevents the pan from rotating. More specifically, the inner base 1 can have a deeper depression to ensure that the central area of ​​the pan's base collects a sufficient amount of cooking oil, thus preventing problems such as burnt food. The outer base 2, on the other hand, only needs a smaller depression to separate the central area from a supporting surface and thus prevent the pan from rotating.

[0034] More specifically, the depression depth of the first curved surface is understood to be the vertical distance between the lowest point of the first curved surface and the highest point of the inner bottom 1. Similarly, the depression depth of the second curved surface is understood to be the vertical distance between the highest point of the second curved surface and the lowest point of the outer bottom 2.

[0035] In this case, the depression depth of the first curved surface is Hl, and the depression depth of the second curved surface is H2 such that Hl = y*H2, 3 <y<6. Par exemple, H1=3H2, H1=3,5H2, Hl= 4H2, Hl= 4,5H2, H1=5H2, H1=5,5H2 ou H1=6H2, etc. Pour une profondeur globale de dépression du fond de la poêle inchangée, une répartition raisonnable des profondeurs des dépressions respectives dans le fond intérieur 1 et le fond extérieur 2 permet d’assurer une collecte Reliable oil collection and preventing the pan from rotating due to a downward-curved bottom. When H1 < 3H2, the depression depth of the first curved surface is too shallow, making it difficult to meet the oil collection requirements. When H1 > 6H2, the depression depth of the second curved surface is too shallow, resulting in a convex bottom at the start of heating due to the deformation of the outer bottom (surface 2), which is the first to be deformed by the heat.

[0036] The diameter of the outer bottom 2 is DI and the thickness of the bottom of the pan at the center (denoted the center thickness) is Tl, such that Tl=k*Dl, 0.01 <k<0,03. Par exemple, Tl=0,01Dl, Tl=0,015Dl, Tl=0,02Dl, Tl=0,025Dl ou Tl=0,03Dl, etc. Ceci permet d’empêcher la déformation du fond de la poêle et d’assurer la commodité d'utilisation. Lorsque Tl<0,01Dl, l'épaisseur au centre du fond de la poêle est trop fine, ce qui rend le fond de la poêle lui-même trop faible et donc susceptible de se déformer. Lorsque Tl> 0.03Dl, the thickness in the center of the bottom of the pan is too great, which makes the pan too heavy overall and impairs its ease of use.

[0037] Furthermore, the thickness of the pan base at the midpoint of the inner base radius 1 (denoted the thickness at the midpoint of the radius) is T2, such that T2 = Tl + a * Dl, 0.005 <a<0,01. Par exemple, T2=Tl+0,005Dl, T2= Tl+0,006Dl, T2=Tl+0,007Dl, T2=Tl+0,008Dl, T2=Tl+0,009Dl ou T2=T1+O,O1D1, etc. Ceci permet d’assurer un effet fiable de collecte de l'huile et une distribution uniforme de la chaleur pour améliorer les résultats de cuisson. Lorsque T2<T1+0,005*D1, le changement d'épaisseur dans la région centrale du fond de la poêle est trop doux, ce qui entraîne une dépression trop faible dans le fond de la poêle, affectant ainsi l'effet de collecte de l'huile. Lorsque T2> T1+O,O1*D1, the change in thickness in the central region of the bottom of the pan is too great, resulting in uneven heat distribution and affecting cooking results.

[0038] Furthermore, the vertical distance between the edge of the upper surface of the inner bottom 1 and the edge of the lower surface of the outer bottom 2 (denoted as the edge thickness) is T3 such that T3 = T2 + [3 * D1], 0.007 < [3 < 0.012. For example, T3 = T2 + 0.007 D1, T3 = T2 + 0.008 D1, T3 = T2 + 0.009 D1, T3 = T2 + 0.01 D1, T3 = T2 + 0.011 D1, or T3 = T2 + 0.012 D1, etc. This ensures reliable oil collection and uniform heat distribution. When T3 <T2+0,007Dl, davantage de l'huile de cuisson a tendance à rester dans une région périphérique du fond de la poêle, ce qui rend difficile la collecte de l'huile de cuisson dans la région centrale du fond de la poêle, affectant l'effet de collecte de l'huile. Lorsque T3> T2+0.012Dl, the thickness of the peripheral region of the bottom of the pan is too great, which leads to uneven heat distribution and affects cooking results.

[0039] Furthermore, the thickness Tl of the bottom of the pan at the center is greater than or equal to 2.5 mm. For example, the thickness Tl of the bottom of the pan at the center can be 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm or 7 mm, etc. If the thickness of the bottom of the pan in the center is too thin, the bottom of the pan itself would be too weak and have insufficient resistance to deformation.

[0040] In one embodiment, the thickness of the pan base at the center is such that 2.5 mm < Tl < 4 mm. For example, the thickness Tl of the pan base at the center can be 2.5 mm, 2.8 mm, 3 mm, 3.3 mm, 3.5 mm, 3.8 mm, or 4 mm, etc. The thickness of the pan base can be as small as possible to reduce the overall weight of the pan. The thickness of the inner base 1 is from 0.5 mm to 0.8 mm. For example, the thickness of the inner base 1 can be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, or 0.8 mm, etc. The thickness of the outer base 2 is from 0.5 mm to 0.8 mm. For example, the thickness of the outer base 2 can be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm or 0.8 mm, etc. This allows the base of the pan to be treated and formed according to predetermined requirements, and to be resistant to deformation.Note that the inner base 1 and outer base 2 are each formed by stretching sheet metal. When the thickness of the inner base 1 or the thickness of the outer base 2 is less than 0.5 mm, the sheet metal would be too thin and therefore difficult to stretch. When the thickness of the inner base 1 or the thickness of the outer base 2 is greater than 0.8 mm, the intermediate layer 3 would be too thin, and therefore the structural strength of the intermediate layer 3 itself would be too low, which would not meet the deformation resistance requirements of the pan base.

[0041] In another embodiment, the thickness Tl of the pan base at the center is such that Tl > 4 mm. For example, the thickness Tl of the pan base at the center can be 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, or 7 mm, etc. The thickness of the pan base can also be greater to ensure sufficient resistance to deformation and to prevent deformation of the pan base. The thickness of the inner base 1 is from 0.5 mm to 1.2 mm. For example, the thickness of the inner bottom 1 can be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, 1.05 mm, 1.1 mm, 1.15 mm or 1.2 mm, etc. The thickness of the outer bottom 2 is from 0.5 mm to 1.2 mm. For example, the thickness of the outer bottom 2 can be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, 1.05 mm, 1.1 mm, 1.15 mm or 1.2 mm, etc.This ensures that the pan base is treated and formed according to predetermined requirements and is resistant to deformation. If the thickness of the inner base 1 or the thickness of the outer base 2 is less than 0.5 mm, the sheet metal would be too thin and therefore difficult to form by stretching. If the thickness of the inner base 1 or the thickness of the outer base 2 is greater than 1.2 mm, the interlayer 3 would be too thin, and therefore the structural strength of the interlayer 3 itself would be too low, which would prevent it from meeting the deformation resistance requirements of the pan base.

[0042] Taking as an example a frying pan having a diameter of 24 cm, the specific structure of the pan according to an embodiment of the present invention can be as follows:

[0043] the thickness of the inner bottom 1 is 0.6 mm, and the depression depth of the inner bottom 1 is H1 = 2.5 mm;

[0044] the thickness of the outer bottom 2 is 0.5 mm, the depression depth of the outer bottom 2 is H2 = 0.6 mm, and the diameter of the outer bottom 2 is DI = 172 mm;

[0045] the thickness at the center T1 = 3 mm, the thickness at the midpoint of the radius T2 = 4.4 mm, and the thickness at the edge T3 = 6.1 mm.

[0046] The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention, which may be subject to various modifications and variations for those skilled in the art. All modifications, equivalent substitutions, improvements, etc., made in the spirit and according to the principles of the present invention shall be included within the scope of protection of this application.

Claims

Demands

1. A pan, characterized in that it comprises a base, the base comprising: - an inner base (1), the upper surface of which is provided with a first curved surface concave at least in its central region; - an outer base (2) connected with a lower surface of the inner base (1), a lower surface of the outer base (2) being provided with a second curved surface concave at least in its central region; - an intercalary layer (3) sandwiched between the inner base (1) and the outer base (2), the intercalary layer (3) having a coefficient of thermal expansion greater than the coefficient of thermal expansion of the inner base (1) and the coefficient of thermal expansion of the outer base (2).

2. The pan according to claim 1, characterized in that the coefficient of thermal expansion of the inner bottom (1) is greater than the coefficient of expansion of the outer bottom (2).

3. The pan according to claim 1, characterized in that the depression depth of the first curved surface is greater than the depression depth of the second curved surface.

4. The pan according to claim 3, characterized in that the depression depth of the first curved surface is H1, and the depression depth of the second curved surface is H2 such that: H1 = y*H2, 3 <y<6.

5. The pan according to claim 1, characterized in that the diameter of the outer bottom (2) is Dl, and the thickness of the bottom of the pan at the center is Tl such that: Tl = k*Dl, 0.01 <k<0,03.

6. The pan according to claim 5, characterized in that the thickness of the bottom of the pan at the midpoint of the radius of the inner bottom (1) is T2 such that: T2 = Tl + a*Dl, 0.005 <a<0,01.

7. The pan according to claim 6, characterized in that the vertical distance between an edge of the upper surface of the inner bottom (1) and an edge of the lower surface of the outer bottom (2) is T3 such that: T3 = T2 + |3*D1, 0.007<[3<0.

012.

8. The pan according to any one of claims 1 to 7, characterized in that the thickness Tl of the bottom of the pan at the centre is greater than or equal to 2.5 mm.

9. The pan according to claim 8, characterized in that the thickness of the bottom of the pan at the center is such that 2.5 mm <Tl<4 mm, l'épaisseur du fond intérieur (1) étant de 0,5 mm à 0,8 mm, et l'épaisseur du fond extérieur (2) étant de 0,5 mm à 0,8 mm.

10. The pan according to claim 8, characterized in that, the thickness of the bottom of the pan at the center is such that Tl>4 mm, the thickness of the inner bottom (1) being from 0.5 mm to 1.2 mm, and the thickness of the outer bottom (2) being from 0.5 mm to 1.2 mm.

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