Oil-leakage-free electromagnetic induction cookware

Abstract

The utility model discloses an electromagnetic induction cookware without oil leakage, and relates to the technical field of cookware. The electromagnetic induction cooker comprises a base material layer and a magnetic conduction layer arranged at the bottom of the outer side of the base material layer, the magnetic conduction layer is provided with a heating surface and can be heated in an electromagnetic induction mode, a plurality of gaps are formed in the heating surface of the magnetic conduction layer, and the gaps penetrate through the magnetic conduction layer and do not penetrate through the base material layer. According to the scheme, the multiple gaps are formed in the magnetic conductive layer, the gaps penetrate through the magnetic conductive layer and do not penetrate through the base material layer, the gaps can accommodate slight deformation of the magnetic conductive layer after being heated, the shape of the base material layer cannot be affected, oil does not leak from the pot bottom during cooking, and the cooking experience feeling is better.

Description

Technical Field

[0001] The utility model relates to the technical field of cookware, in particular to an electromagnetic induction cookware that does not leak oil. Background Art

[0002] In the prior art, cookware generally includes a pot body and a pot bottom covered on the bottom surface of the pot body. The bottom surface of the pot body is a plane. The pot body is generally made of aluminum or aluminum alloy material, and the pot bottom is a magnetic conductive material (such as iron, stainless steel, etc.), so that it can be applied to an induction cooker. In the prior art, the pot bottom is a complete flat plate, which is compounded on the bottom of the pot body. Its disadvantages are as follows: Since the pot body and the pot bottom are made of two different materials, their expansion rates after heating are different. After heating, the expansion rates of the pot body and the pot bottom are different, resulting in an uneven bottom surface of the pot body, so that the oil poured into the pot gathers in a certain direction and cannot be evenly spread on the bottom surface of the pot body.

[0003] Therefore, how to provide a double-bottom cookware with a small deformation of the bottom surface of the pot body after heating and not affecting the magnetic conductivity of the pot bottom has become an urgent technical problem to be solved at present. Summary of the Utility Model

[0004] The technical problem to be solved by the embodiments of the utility model is that the bottom of the existing induction cooker cookware is prone to heat deformation, affecting the use experience.

[0005] To solve the above problems, the embodiments of the utility model provide the following technical solutions:

[0006] An electromagnetic induction cookware that does not leak oil, which includes a base material layer and a magnetic conductive layer provided on the outer bottom of the base material layer. The magnetic conductive layer has a heating surface and can be heated by electromagnetic induction. A plurality of gaps are provided on the heating surface of the magnetic conductive layer, and the gaps penetrate through the magnetic conductive layer and do not penetrate through the base material layer.

[0007] Further, the plurality of gaps divide the heating surface of the magnetic conductive layer into a plurality of parts, and on the magnetic conductive layer, the total area of the heating surfaces of the plurality of parts exceeds 95%.

[0008] Further, the width of the gap is 0.2 - 1.0 mm.

[0009] Further, the depth of the gap is 0.2 - 1.0 mm.

[0010] Further, the gap is formed by laser cutting.

[0011] Further, the thickness of the magnetic conductive layer is 0.3 - 1.0 mm.

[0012] Further, the thickness of the base material layer is 2.5 - 4.0 mm.

[0013] Further, the magnetic conductive layer is made of at least one of iron, 410 stainless steel, and 430 stainless steel.

[0014] Further, the bottom concave value of the bottom of the oil-proof electromagnetic induction cookware is 0.1 - 0.5 mm.

[0015] Further, the substrate layer is made of aluminum or aluminum alloy; at least one of stainless steel substrate, iron substrate, and titanium substrate is compounded on the inner side of the substrate layer; or a non-stick coating is provided on the inner side of the substrate layer.

[0016] Compared with the prior art, the technical effects that can be achieved by the embodiments of the present invention include:

[0017] The oil-proof electromagnetic induction cookware provided by the present invention has a magnetic conductive layer at the bottom for electromagnetic induction heating. By providing a plurality of gaps on the magnetic conductive layer, the gaps penetrate through the magnetic conductive layer but do not penetrate through the substrate layer. After heating, the gaps can accommodate slight deformation of the magnetic conductive layer and do not affect the shape of the substrate layer, do not affect the magnetic permeability of the bottom of the pot, do not run oil during cooking, have a better cooking experience, do not reduce the magnetic permeability of the bottom of the pot, have high thermal efficiency, and are more energy-saving; its processing technology is simple, the cost is low, and it is suitable for mass production or personalized customization in factories; based on the plurality of gaps on the magnetic conductive layer, a preset pattern can be formed, making the bottom of the cookware beautiful, and the formed pattern types are rich, which can meet the various customization scheme requirements of customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for description in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of an oil-proof electromagnetic induction cookware provided by an embodiment of the present invention;

[0020] Figure 2 It is a schematic structural diagram of the bottom of an electromagnetic induction cookware provided by an embodiment of the present invention;

[0021] Figure 3 It is a schematic structural diagram of an oil-proof electromagnetic induction cookware provided by another embodiment of the present invention;

[0022] Figure 4 It is a schematic structural diagram of an oil-proof electromagnetic induction cookware provided by another embodiment of the present invention;

[0023] Figure 5Schematic diagram of the structure of an electromagnetic induction cooker that does not leak oil provided by another embodiment of the present utility model;

[0024] Figure 6 Schematic diagram of the structure of an electromagnetic induction cooker that does not leak oil provided by another embodiment of the present utility model.

[0025] Reference numerals

[0026] Base material layer 1, magnetic conductive layer 2, gap 3. Specific implementation manner

[0027] Next, the technical solutions in the embodiments will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Similar component numbers in the drawings represent similar components. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0028] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0029] It should also be understood that the terms used in the specification of the embodiments of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present utility model. As used in the specification of the embodiments of the present utility model and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0030] See Figure 1-2 , the embodiments of the present utility model provide an electromagnetic induction cooker that does not leak oil. As can be seen from the figure, it includes a base material layer 1 and a magnetic conductive layer 2 provided at the outer bottom of the base material layer 1; the magnetic conductive layer 2 has a heating surface 4 that can be heated by electromagnetic induction. A plurality of gaps 3 are provided on the heating surface 4 of the magnetic conductive layer 2, and the gaps 3 penetrate through the magnetic conductive layer 2 and do not penetrate through the base material layer 1.

[0031] In this embodiment, by providing a plurality of gaps 3 on the magnetic conductive layer 2, the gaps 3 penetrate through the magnetic conductive layer 2 and do not penetrate through the base material layer 1. After heating, the gaps can accommodate the slight deformation of the magnetic conductive layer 2 and will not affect the shape of the base material layer 1. When cooking, the bottom of the pot does not leak oil, and the cooking experience is better.

[0032] Furthermore, see Figure 3-6, in a specific embodiment, multiple said gaps 3 divide the heat-receiving surface 4 of the magnetic conductive layer 2 into multiple parts. On the magnetic conductive layer 2, the total area of the multiple heat-receiving surfaces 4 exceeds 95%, and the multiple heat-receiving surfaces 4 form a rich preset pattern.

[0033] Based on multiple gaps on the magnetic conductive layer 2 in this embodiment, a preset pattern can be formed, making the bottom of the cookware beautiful, and the formed pattern types are rich, which can meet the various customized solution requirements of customers.

[0034] It can be understood that the magnetic permeability of the bottom of the pot is related to the contact area between the magnetic conductive layer 2 and the induction cooker. Since gaps are opened in the magnetic conductive layer and the gaps do not contact the induction cooker, therefore, the bottom surface of the magnetic conductive layer 2 is not completely in contact with the induction cooker, only the heat-receiving surface 4 is in contact with the induction cooker. Therefore, the total area of the multiple heat-receiving surfaces in this embodiment exceeding 95% means that the total area of the heat-receiving surface 4 on the magnetic conductive layer 2 exceeds 95% of the bottom area of the magnetic conductive layer. In this way, it can be ensured that the multiple opened gaps do not affect the magnetic permeability of the bottom of the pot.

[0035] In the specific implementation manner, the width of the gap 3 is 0.2 - 1.0 mm. Based on different preset patterns, the width of the gap 3 can also be flexibly adjusted. For example, the width of the gap is 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, etc., which is not limited in the present utility model.

[0036] In the specific implementation manner, the depth of the gap 3 is 0.2 - 1.0 mm. It can be understood that in order to prevent the different thermal expansion rates of the materials of the magnetic conductive layer 2 and the base material layer 1 from affecting the flatness of the bottom of the cookware, multiple gaps 3 are opened in the magnetic conductive layer 2 to accommodate the thermal expansion of the material of the magnetic conductive layer 2. To ensure effectiveness, the depth of the gap 3 should be less than or equal to the thickness of the magnetic conductive layer 2.

[0037] For example, in an embodiment, the thickness of the magnetic conductive layer 2 is 0.3 mm. The depth of the gap 3 is 0.2 mm.

[0038] In an embodiment, the thickness of the magnetic conductive layer 2 is 0.5 mm. The depth of the gap 3 is 0.5 mm.

[0039] In an embodiment, the thickness of the magnetic conductive layer 2 is 0.8 mm. The depth of the gap 3 is 0.4 mm.

[0040] In an embodiment, the thickness of the magnetic conductive layer 2 is 1.0 mm. The depth of the gap 3 is 0.8 mm.

[0041] In this embodiment, the gap 3 is formed by laser cutting. For example, the gap is formed by a laser cutting machine.

[0042] In other embodiments, for a pot that requires a preset pattern on the bottom of the pot, a laser marking machine can be used to form the preset pattern on the magnetic conductive layer 2 by laser marking and cutting.

[0043] In other embodiments, the thickness of the substrate layer 1 is 2.5-4.0 mm. It can be understood that in order to realize the cooking function of the cookware, the thickness of the substrate layer 1 only needs to meet the corresponding hardness, friction resistance and other properties. The thickness of the substrate layer 1 can be 2.8 mm, 3.0 mm, 3.5 mm, 4.0 mm, etc.

[0044] In other embodiments, the magnetic conductive layer 2 is made of at least one of iron, 410 stainless steel and 430 stainless steel, and has excellent magnetic permeability.

[0045] In a specific embodiment, the material of the magnetic conductive layer 2 is cold-riveted on the substrate layer through a punching structure, or is hot-forged at high temperature, or is brazed to form the magnetic conductive layer 2 .

[0046] In other embodiments, the substrate layer 1 is made of aluminum or aluminum alloy.

[0047] In other embodiments, the inner side of the substrate layer 1 is compounded with at least one of a stainless steel substrate, an iron substrate and a titanium substrate. For example, an iron substrate is compounded on the inner side of an aluminum alloy material to obtain a composite substrate layer to improve the hardness, wear resistance and other properties of the cookware.

[0048] In other embodiments, a non-stick coating is provided on the inner side of the substrate layer 1. The non-stick coating can be formed by spraying on the inner side of the substrate layer using a spraying process, or a microstructure can be formed on the inner side of the substrate layer to achieve a non-stick effect.

[0049] In a specific embodiment, the bottom concave value of the electromagnetic induction cookware without oil leakage is 0.1-0.5 mm. During the forming process of the cookware, a certain concave value will be formed on the bottom of the cookware to prevent the bottom of the cookware from convex. Since the bottom of the cookware of this embodiment has little thermal deformation, the bottom concave value after the bottom is formed can be 0.1-0.5 mm, which can prevent the bottom of the cookware from oil leakage to a greater extent.

[0050] The following is a method for preparing an electromagnetic induction cooker without oil leakage provided by an embodiment of the utility model, comprising the following steps:

[0051] 1. Sand or sandblast the 430 stainless steel magnetic conductive material disc with smooth and clean double sides to make the surface roughness Ra 2.5~10;

[0052] 2. Clean the aluminum sheet and the processed 430 ferromagnetic material wafer, weld them together by spot welding, then heat the two through a tunnel furnace, raise the temperature to between 470 and 530 °C, put them into a special hot forging composite mold, and forge press to composite the aluminum sheet and the ferromagnetic wafer together. The ferromagnetic performance of the 430 wafer is extremely high. After being composited with the aluminum sheet through hot forging in this embodiment, the bonding force is strong and it is not easy to fall off.

[0053] 3. Form the composited sheet material by stretching or forging to make a pot body. The outer bottom of the pot body is a ferromagnetic wafer, as Figure 1 .

[0054] 4. After cleaning the pot body, cut the ferromagnetic wafer at the bottom of the pot according to the pattern of the bottom of the pot in Figure 1 to cut out the gap 3 in Figure 1 . The depth of the gap 3 is 0.5 - 0.8 mm and the width is 0.2 mm.

[0055] 5. Through the conventional cooking utensil processing technology: internal sandblasting - cleaning - spraying internal coating - external polishing - spraying external coating - sanding the bottom - patting the bottom, an electromagnetic induction cooking utensil that does not leak oil can be made. Among them, the patting bottom process is to pat out a certain concave value at the bottom of the pot to prevent the pot body from bulging at the bottom. Since the hot state deformation amount of the bottom of the cooking utensil in this embodiment is small, the bottom concave value after patting can be made to be 0.1 - 0.5 mm, which can prevent the bottom of the pot from leaking oil to a greater extent.

[0056] Unless otherwise specified, the electromagnetic induction cooking utensils that do not leak oil provided in the following embodiments are all made by the above - mentioned method.

[0057] Embodiment 1

[0058] The present invention provides an electromagnetic induction cooking utensil that does not leak oil in Embodiment 1. The inner surface of the cooking utensil is a base material layer 1 with a thickness of 3.0 mm; at the bottom of the outer surface of the cooking utensil, there is a ferromagnetic layer 2 with a thickness of 0.5 mm on the base material layer 1.

[0059] The plane diameter of the bottom of the base material layer 1 is 208 mm, the thickness is 3.0 mm, and the material is aluminum alloy.

[0060] The diameter of the ferromagnetic layer 2 is 188 mm, the thickness is 0.5 mm, and the material is 430 stainless steel.

[0061] There are gaps 3 with a depth of 0.5 - 0.7 mm and a width of 0.2 - 0.3 mm on the ferromagnetic layer 2.

[0062] Comparative Example 1

[0063] The difference between this comparative example and Embodiment 1 is that the composite of the ferromagnetic wafer at the bottom of the cooking utensil in Comparative Example 1 and the aluminum base material layer adopts a cold composite process.

[0064] Comparative Example 2

[0065] The difference between this comparative example and Example 1 is that the magnetic conductive disc at the bottom of the cookware in Comparative Example 2 is compounded with the aluminum substrate layer by a thermal compounding process.

[0066] Comparative Example 3

[0067] The difference between this comparative example and Example 1 is that the magnetic conductive disc at the bottom of the cookware in Comparative Example 3 is a pre-made hollowed-out magnetic conductive disc with the same gaps, and then it is compounded with the aluminum substrate layer by a thermal compounding process.

[0068] The cookware obtained from the above examples and comparative examples was subjected to performance tests and the results were recorded in the following table. The specific performance test methods are as follows:

[0069] Magnetic permeability test method: Test using a standard induction cooker in accordance with GB_T 32147-2015 for cookware applicable to household induction cookers;

[0070] Bottom stability test method: Test according to the LGA bottom concave value.

[0071] The results are shown in Table 1.

[0072] Table 1 Performance test results of the cookware obtained from the examples and comparative examples

[0073] Test item Example 1 Comparative example 1 Comparative example 2 Comparative example 3 Permeability 1950W 1750W 1650W 1950W Bottom stability 2‰ 6‰ 3.5‰ 10‰

[0074] As can be seen from the results in Table 1, the process of hot forging and compounding followed by laser cutting can effectively ensure the stability of the bottom of the cookware.

[0075] In the above examples, the descriptions of each example have their own focuses. For parts not described in detail in a certain example, reference can be made to the relevant descriptions of other examples.

[0076] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0077] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0078] In the present utility model, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. should be construed in a broad sense. For example, it may be a connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0079] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0080] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and mix the different embodiments or examples described in this specification.

[0081] Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from the spirit and scope of the present utility model. Thus, provided that these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model also intends to include these modifications and variations.

[0082] The above are the specific implementation manners of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. An electromagnetic induction cooker that does not leak oil, characterized in that, It includes a base material layer and a magnetic conductive layer provided at the outer bottom of the base material layer; the magnetic conductive layer has a heat receiving surface that can be heated by electromagnetic induction, and a plurality of gaps are provided on the heat receiving surface of the magnetic conductive layer, and the gaps penetrate through the magnetic conductive layer and do not penetrate through the base material layer.

2. The non-oil-leaking electromagnetic induction cookware according to claim 1, wherein The plurality of gaps divide the heat receiving surface of the magnetic conductive layer into multiple parts, and on the magnetic conductive layer, the total area of the heat receiving surfaces of the multiple parts exceeds 95%.

3. The non-oil-leaking electromagnetic induction cookware according to claim 1, characterized in that, The width of the gap is 0.2 to 1.0 mm.

4. The electromagnetic induction cookerware that does not leak oil according to claim 3, wherein The depth of the gap is 0.2 to 1.0 mm.

5. The electromagnetic induction cookerware that does not leak oil according to claim 4, wherein The thickness of the magnetic conductive layer is 0.3 to 1.0 mm.

6. The electromagnetic induction cookerware that does not leak oil according to claim 1, wherein The thickness of the base material layer is 2.5 to 4.0 mm.

7. The non-oil-leaking electromagnetic induction cookware according to claim 1, wherein The bottom concave value of the bottom of the non-oil-leaking electromagnetic induction cooker is 0.1 to 0.5 mm.

8. The non-oil-leaking electromagnetic induction cooker according to claim 1, characterized in that, The material of the base material layer is aluminum or aluminum alloy material; at least one of a stainless steel base material, an iron base material, and a titanium base material is compounded on the inner side of the base material layer; or a non-stick coating is provided on the inner side of the base material layer.

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