Pfanne

Abstract

Pan, characterized in that it comprises a base, wherein the base comprises: - an inner floor (1) whose upper surface is provided with a first concave curved surface at least in its middle region; - an outer bottom (2) connected to a lower surface of the inner bottom (1), wherein a lower surface of the outer bottom (2) is provided with a second concave curved surface at least in its central region; - an intermediate layer (3) arranged sandwich-like between the inner floor (1) and the outer floor (2), wherein the intermediate layer (3) has a coefficient of thermal expansion greater than the coefficient of thermal expansion of the inner floor (1) and the coefficient of thermal expansion of the outer floor (2).

Description

[0001] The present application concerns the technical field of kitchen appliances, in particular a frying pan.

[0002] The available pans can be categorized into conventional pans and oil-collecting pans, depending on their base structure. The base of a conventional pan is usually flat or slightly convex. When heated, the base warps upwards, causing the oil to run to the sides of the pan. This makes heat control difficult, and ingredients tend to stick. An oil-collecting pan typically has a concave base. When heated, this base warps downwards, forming a convex shape towards the edges, which can cause the pan to rotate on its surface. Therefore, it's worth noting that these pans tend to warp easily during use and have poor base stability.

[0003] The present invention provides a pan which solves the problem of deformation of the pan base by improving the stability of the pan.

[0004] The present invention proposes a pan with a base, wherein the base - an inner floor, the upper surface of which is provided with a first concave curved surface at least in its middle area; - an outer floor connected to a lower surface of the inner floor, wherein a lower surface of the outer floor is provided with a second concave curved surface at least in its central region; - an intermediate layer sandwiched between the inner floor and the outer floor, wherein the intermediate layer has a coefficient of thermal expansion greater than the coefficient of thermal expansion of the inner floor and the coefficient of thermal expansion of the outer floor.

[0005] The base of the pan according to the invention comprises an inner base, an outer base, and an intermediate layer. The upper surface of the inner base is provided, at least in its central region, with a first concave curved surface. This first curved surface facilitates an oil collection effect. The outer base is connected to the lower surface of the inner base, and a second concave curved surface is provided, at least in the central region of the lower surface of the outer base. This second curved surface forms a recess or hollow bulge in the central region of the outer base, preventing the pan from rotating.The intermediate layer is positioned between the inner and outer layers, and its coefficient of thermal expansion is greater than that of both the inner and outer layers. This means that the intermediate layer and the inner layer, as well as the intermediate layer and the outer layer, form two bimetallic structures, causing the inner and outer layers to deform in opposite directions. In this way, the deformation of the inner layer and the deformation of the outer layer can at least partially compensate for each other, thus solving the problem of pan bottom deformation and improving the pan bottom's stability.

[0006] Optionally, the coefficient of thermal expansion of the inner base is greater than that of the outer base. This ensures that the deformation tendency of the inner base is as close as possible to that of the outer base, so that the deformation of the inner base and the deformation of the outer base balance each other as much as possible, thereby reducing or eliminating the overall deformation of the pan base.

[0007] Optionally, the depth of the indentation of the first curved surface is greater than the depth of the indentation of the second curved surface, thus ensuring a reliable oil collection effect and effectively preventing the pan from rotating.

[0008] Optionally, the depth of the indentation of the first curved surface H1 and the depth of the indentation of the second curved surface H2 are such that H1 = γ * H2, 3 ≤ γ ≤ 6. With an unchanged total indentation depth of the pan bottom, a more appropriate distribution of the indentation depth in the inner bottom and the indentation depth in the outer bottom ensures a reliable oil collection effect and prevents the pan from rotating due to a downward convex bottom.

[0009] Optionally, the diameter of the outer base D1 and the thickness of the pan base in the middle T1 are such that T1 = k * D1, 0.01 ≤ k ≤0.03, which prevents deformation of the pan base and ensures convenient use.

[0010] Optionally, the thickness of the pan base at the center of the inner base radius T2 is such that T2 = T1 + α * D1, 0.005 ≤ α ≤0.01, ensuring a reliable oil collection effect and even heat distribution to improve cooking results.

[0011] 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 T3 is such that T3 = T2 + β * D1, 0.007 ≤ β ≤ 0.012, which ensures a reliable oil collection effect and uniform heat distribution.

[0012] Optionally, the thickness T1 of the pan base in the middle is greater than or equal to 2.5 mm to prevent the thickness of the pan base in the middle from being too small, which would result in the pan base itself being too weak and having insufficient resistance to deformation.

[0013] Optionally, the thickness of the pan base in the center is such that 2.5 mm ≤ T1 < 4 mm. The pan base should be as thin as possible to reduce the overall weight of the pan.

[0014] 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 pan bottom to be treated and shaped according to predetermined requirements and makes it resistant to deformation.

[0015] Optionally, the thickness of the pan base in the center is such that T1 ≥ 4 mm. Choosing a thicker base ensures that the pan base has sufficient resistance to deformation to prevent deformation.

[0016] The thickness of the inner bottom is 0.5 mm to 1.2 mm, and the thickness of the outer bottom is 0.5 mm to 1.2 mm, which allows the pan bottom to be treated and shaped according to the intended requirements and makes it resistant to deformation.

[0017] It should be noted that the above general description and the following detailed description serve as examples and do not limit the present invention. Brief description of the characters [ Fig. 1] Fig. Figure 1 is a schematic structural view of a pan provided by an embodiment of the present invention.

[0018] List of reference symbols: 1 inner floor; 2 outer floor; 21 Widening; 3 Intermediate layer.

[0019] The figures included and forming part of the description illustrate embodiments that fall within the scope of the present invention and, together with the description, serve to explain the principles of the present invention. Detailed description

[0020] The present invention is 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 here serve only to illustrate the present invention and are not intended to limit it.

[0021] In the description of this application, unless expressly stated or limited otherwise, the terms "first" and "second" are used for descriptive purposes and are not to be interpreted as indicating or implying a relative meaning. Unless otherwise stated or described, "multiple" means two or more; the terms "connection," "fixed," etc., are to be understood in a broad sense. For example, a "connection" may be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it may be direct or indirect via an intermediate support. The specific meaning of the above terms in this application may be understood by the person skilled in the art according to the specific circumstances.

[0022] The description assumes that directional terms such as "above" and "below," used in the description of the embodiments of the present application, are described from the perspective shown in the figures and are not to be understood as limiting the embodiments of the present invention. Furthermore, it is assumed in this context that when an element is described as being connected "above" or "below" another element, it may be connected not only directly "above" or "below" the other element, but also indirectly via an intermediate element.

[0023] As in Fig. As shown in Figure 1, one embodiment of the present invention proposes a pan comprising a base and a wall which are connected to each other.

[0024] The pan's base and wall together form a cavity for holding food. A handle may be attached to the outside of the pan wall to make it easier for the user to grip and lift the pan.

[0025] The pan base consists of an inner base 1, an outer base 2, and an intermediate layer 3. The upper surface of the inner base 1 has a first inwardly concave (downwardly concave) curved surface, at least in its central region. This first curved surface creates an oil-collecting effect. 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 inwardly concave curved surface, at least in its central region. This second curved surface forms a recess in the central region of the outer base 2, preventing the pan from rotating. The intermediate layer 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, form two bimetallic structures, and the inner base 1 and the outer base 2 tend to deform in opposite directions. In this way, the deformation of the inner base 1 and the deformation of the outer base 2 at least partially cancel each other out, thus solving the problem of deformation of the pan base and improving its stability.

[0026] More precisely, since the coefficient of thermal expansion of the intermediate layer 3 is greater than that of the inner base 1, the deformation of the intermediate layer 3 is greater than that of the inner base 1 when heated. Therefore, the intermediate layer 3 and the inner base 1 tend to bend upwards. Since the coefficient of thermal expansion of the intermediate layer 3 is greater than that of the outer base 2, the deformation of the intermediate layer 3 is also greater than that of the outer base 2 when heated. Therefore, 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 each other.If the deformation of the inner bottom 1 is greater than that of the outer bottom 2, the pan bottom exhibits an overall upward bend or deformation. In this case, the depth of the depression of the first curved surface increases slightly, and the depth of the depression of the second curved surface decreases slightly. If the deformation of the inner bottom 1 is less than that of the outer bottom 2, the pan bottom exhibits an overall downward bend or deformation. In this case, the depth of the depression of the first curved surface decreases slightly, and the depth of the depression of the second curved surface increases slightly. If the deformation of the inner bottom 1 is equal to the deformation of the outer bottom 2, the pan bottom exhibits almost no overall deformation. In this case, the depth of the depression of the first curved surface and the depth of the depression of the second curved surface remain unchanged.

[0027] In this embodiment, the inner base 1 is formed by drawing a sheet of metal and can be formed integrally with the pan wall to increase the continuity and integrity of the inner surface of the pan base. The outer base 2 can also be formed by drawing a sheet of metal. The edge of the outer base can be provided with an upwardly directed extension 21 and connected to the inner base 1 by means of this extension 21. A cavity is formed between the outer base 2 and the inner base 1. The intermediate layer 3 fills this cavity. Thus, the inner base 1, the outer base 2, and the intermediate layer 3 together form a composite pan base.

[0028] Since the coefficient of thermal expansion of the inner base 1 is greater than that of the outer base 2, the deformation tendency of the inner base 1 can be as close as possible to that of the outer base 2, so that the deformation of the inner base 1 and the deformation of the outer base 2 largely balance each other, thus reducing the overall deformation of the pan base. More precisely, when heated, the outer base 2 is in direct contact with the heat source and transfers the heat through the intermediate layer 3 to the inner base 1, so that the temperature of the outer base 2 is higher than that of the inner base 1. If the coefficient of thermal expansion of the inner base 1 is equal to that of the outer base 2, the deformation tendency of the outer base 2 will be significantly greater than that of the inner base 1.By choosing a material with a lower coefficient of thermal expansion for the outer base 2, which has a higher temperature, and a material with a higher coefficient of thermal expansion for the inner base 1, which has a lower temperature, it is possible for the deformations of the two bases to converge more strongly, thereby reducing or eliminating the overall deformation of the pan base.

[0029] More precisely, the inner base 1 can be made of stainless steel sheet 316 with a coefficient of thermal expansion of approximately 16 * 10 -6 / °C; the outer base 2 can be made of stainless steel sheet 430 with a coefficient of thermal expansion of approximately 10 * 10 -6 / °C; the intermediate layer 3 can be made of pure aluminum 1050 with a coefficient of thermal expansion of approximately 23 * 10 -6 / °C. While the use of stainless steel 316 and stainless steel 443 ensures reliable oil collection and good resistance to deformation, it also provides good corrosion resistance. Furthermore, the use of pure aluminum ensures good thermal conductivity and more even heat distribution. Of course, the inner base 1, the outer base 2, and the intermediate layer 3 can also be made from other suitable materials, depending on requirements.

[0030] In this embodiment, the depth of the indentation in the first curved surface is greater than that of the second curved surface, thus ensuring a reliable oil collection effect and effectively preventing the pan from rotating. More precisely, the inner base 1 can be provided with a larger indentation to ensure that the central area of ​​the pan base collects a sufficient amount of cooking oil, thereby preventing problems such as food sticking. The outer base 2, on the other hand, requires only a smaller indentation to separate the central area from a stable surface and thus prevent the pan from rotating.

[0031] More precisely, the depth of the depression of the first curved surface refers to the vertical distance between the lowest point of the first curved surface and the highest point of the inner floor 1. Similarly, the depth of the depression of the second curved surface refers to the vertical distance between the highest point of the second curved surface and the lowest point of the outer floor 2.

[0032] In this case, the depth of the depression of the first curved surface H1 and the depth of the depression of the second curved surface H2 are such that H1 = γ * H2, 3 ≤ γ ≤ 6. For example, H1 = 3 H2, H1 = 3.5 H2, H1 = 4 H2, H1 = 4.5 H2, H1 = 5 H2, H1 = 5.5 H2, or H1 = 6 H2, etc. With an unchanged total depression depth of the pan bottom, a sensible distribution of the respective depression depths in the inner bottom 1 and the outer bottom 2 ensures that the oil is reliably collected and that the pan cannot rotate due to a downward convex bottom. If H1 < 3 H2 and the depression depth of the first curved surface is too shallow, it is difficult to meet the requirements for the oil collection effect.If H1 > 6 H2, the depth of the depression of the second curved surface is too small, resulting in the phenomenon of a convex bottom at the beginning of heating due to the deformation of the outer bottom 2, which is the first to be deformed by the heat.

[0033] The diameter of the outer base 2 is D1, and the thickness of the pan base in the middle (referred to as the center thickness) is T1 such that T1 = k * D1, 0.01 ≤ k ≤ 0.03. For example, T1 = 0.01 D1, T1 = 0.015 D1, T1 = 0.02 D1, T1 = 0.025 D1, or T1 = 0.03 D1, etc. This prevents deformation of the pan base and ensures ease of use. If T1 < 0.01 D1, the center thickness of the pan base is too small, making the pan base itself too weak and thus prone to deformation. If T1 > 0.03 D1, the center thickness of the pan base is too large, making the pan too heavy overall and impairing its usability.

[0034] Furthermore, the thickness of the pan base at the center of the radius of the inner base 1 (denoted as the thickness at the center of the radius) T2 is such that T2 = T1 + α * D1, 0.005 ≤ α ≤ 0.01. For example, T2 = T1 + 0.005 D1, T2 = T1 + 0.006 D1, T2 = T1 + 0.007 D1, T2 = T1 + 0.008 D1, T2 = T1 + 0.009 D1, or T2 = T1 + 0.01 D1, etc. This ensures a reliable oil retention effect and even heat distribution to improve frying results. If T2 < T1 + 0.005 * D1, the thickness change in the middle area of ​​the pan base is too soft, resulting in insufficient vacuum in the pan base and thus impairing the oil retention effect. If T2 > T1 + 0.01 * D1, the change in thickness in the middle area of ​​the pan base is too large, which leads to an uneven heat distribution and impairs the frying results.

[0035] Furthermore, the vertical distance between the edge of the upper surface of the inner base 1 and the edge of the lower surface of the outer base 2 (noted as the thickness at the edge) is T3, depending on whether T3 = T2 + β * D1, 0.007 ≤ β ≤ 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 a reliable oil collection effect and uniform heat distribution. If T3 < T2 + 0.007D1, more cooking oil tends to remain at the edges of the pan, making it difficult for the oil to collect in the center and impairing the oil collection effect. If T3 > T2 + 0.012D1, the thickness of the edges of the pan is too great, resulting in uneven heat distribution and negatively impacting cooking results.

[0036] Furthermore, the thickness T1 of the pan base in the center is greater than or equal to 2.5 mm. For example, the thickness T1 of the pan base in 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 pan base in the center is too thin, the pan base itself would be too weak and would exhibit insufficient resistance to deformation.

[0037] In one embodiment, the thickness of the pan base in the center is such that 2.5 mm ≤ T1 < 4 mm. For example, the thickness T1 of the pan base in 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 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 0.5 mm to 0.8 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, or 0.8 mm, etc. This allows the pan bottom to be treated and shaped according to predetermined requirements and to be resistant to deformation. Note that the inner bottom 1 and the outer bottom 2 are each formed by drawing sheet metal.If the thickness of the inner layer 1 or the thickness of the outer layer 2 is less than 0.5 mm, the sheet would be too thin and therefore difficult to form by drawing. If the thickness of the inner layer 1 or the thickness of the outer layer 2 is greater than 0.8 mm, the intermediate layer 3 would be too thin, and thus the structural strength of the intermediate layer 3 itself would be too low, so that the requirements for the deformation resistance of the pan bottom could not be met.

[0038] In another embodiment, the thickness T1 of the pan base in the center is such that T1 ≥ 4 mm. For example, the thickness T1 of the pan base in 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 0.5 mm to 1.2 mm. For example, the thickness of the inner layer 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 layer 2 is 0.5 mm to 1.2 mm. For example, the thickness of the outer layer 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 allows the pan bottom to be machined and shaped according to the specified requirements and makes it resistant to deformation. If the thickness of the inner layer 1 or the thickness of the outer layer 2 is less than 0.5 mm, the sheet would be too thin and therefore difficult to form by drawing. If the thickness of the inner layer 1 or the thickness of the outer layer 2 is greater than 1.2 mm, the intermediate layer 3 would be too thin, and thus the structural strength of the intermediate layer 3 itself would be too low, so that the requirements for the deformation resistance of the pan bottom could not be met.

[0039] Taking as an example a frying pan with a diameter of 24 cm, the specific structure of the pan according to one embodiment of the present invention can look like this: The thickness of the inner base 1 is 0.6 mm, and the depth of the depression of the inner base 1 is H1 = 2.5 mm; The thickness of the outer base 2 is 0.5 mm, the depth of the depression of the outer base 2 is H2 = 0.6 mm, and the diameter of the outer base 2 is D1 = 172 mm; The thickness in the middle is T1 = 3 mm, the thickness at the center of the radius is T2 = 4.4 mm, and the thickness at the edge is T3 = 6.1 mm.

[0040] The foregoing is only one preferred embodiment of the present invention and is not intended to limit the present invention, which can be modified and varied in many ways for a person skilled in the art. All modifications, equivalent substitutions, improvements, etc., made in the spirit and according to the principles of the present invention are to be included within the scope of protection of this application.

Claims

[1] Pan, characterized by that it comprises a floor, the floor comprising : - an inner base (1) whose upper surface is provided with a first concavely curved surface at least in its central region; - an outer base (2) connected to a lower surface of the inner base (1), a lower surface of the outer base (2) being provided with a second concavely curved surface at least in its central region; - an intermediate layer (3) sandwiched between the inner base (1) and the outer base (2), the intermediate layer (3) having a thermal expansion coefficient that is greater than the thermal expansion coefficient of the inner base (1) and the thermal expansion coefficient of the outer base (2). [2] Pan according to claim 1, characterized bythat the thermal expansion coefficient of the inner base (1) is greater than the expansion coefficient of the outer base (2). [3] Pan according to claim 1, characterized by that the depth of the depression of the first curved surface is greater than the depth of the depression of the second curved surface. [4] Pan according to claim 3, characterized by that the depth of the depression of the first curved surface H1 and the depth of the depression of the second curved surface H2 is such that H1=γ*H2,3≤γ≤6. [5] Pan according to claim 1, characterized by that the diameter of the outer bottom (2) D1 and the thickness of the pan bottom in the middle T1 is such that T1=k*D1,0,01≤k≤0,03. [6] Pan according to claim 5, characterized by that the thickness of the pan bottom in the middle of the radius of the inner bottom (1) T2 is such that T2=T1+α*D1,0.005≤α≤0.

01. [7] Pan according to claim 6, characterized bythat the vertical distance between an edge of the upper surface of the inner floor (1) and an edge of the lower surface of the outer floor (2) T3 is such that T3=T2+β*D1.0.007≤β≤0.

012. [8] Pan according to one of claims 1 to 7, characterized by that the thickness T1 of the base of the pan in the middle is greater than or equal to 2.5 mm. [9] Pan according to claim 8 characterized by that the thickness of the pan bottom in the middle is such that 2.5 mm ≤ T1 < 4 mm, the thickness of the inner bottom (1) being 0.5 mm to 0.8 mm and the thickness of the outer bottom (2) being 0.5 mm to 0.8 mm. [10] Pan according to claim 8, characterized by that the thickness of the pan bottom in the middle is such that T1 ≥ 4 mm, the thickness of the inner bottom (1) being 0.5 mm to 1.2 mm and the thickness of the outer bottom (2) being 0.5 mm to 1.2 mm.

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