Cookware and electromagnetic cooking utensil

Abstract

The invention provides a pot and an electromagnetic cooking utensil, relates to the technical field of household appliances, and aims to solve the problem that a noise reduction mode in the related technology affects the heating effect of the pot. The pot comprises a pot bottom (110), and a composite noise reduction layer (120) is arranged on the outer wall face of the pot bottom (110). The composite noise reduction layer (120) comprises the following components in percentage by mass: 1-20% of magnetic metal and 1-20% of non-magnetic metal. And 80-99% of a non-magnetic metal. The noise reduction performance can be reserved, and meanwhile the influence on the heating effect of the cookware is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a pot and an electromagnetic cooking utensil. Background Art

[0002] Electromagnetic cooking appliances include pots and electromagnetic heating appliances. Electromagnetic heating appliances refer to kitchen appliances that process ingredients into cooked food through electromagnetic induction heating. Electromagnetic heating appliances commonly used in people's daily lives include induction cookers, IH (Induction Heat) rice cookers, electromagnetic pressure cookers, etc.

[0003] Taking induction cookers as an example, due to the unique electromagnetic induction heating method of induction cookers, most of them use cookware made of specific materials, such as stainless steel cookware. When stainless steel cookware is used with an induction cooker, it will generate relatively large electromagnetic noise. In the related art, a noise reduction layer is usually provided on the bottom of the pot. Specifically, the noise reduction layer, such as a non-ferromagnetic material (copper layer or aluminum layer), is sprayed on the outer wall surface of the bottom of the stainless steel pot.

[0004] However, the above arrangement affects the heating effect of the cookware. Summary of the invention

[0005] The embodiments of the present application provide a cooker and an electromagnetic cooking utensil, which can reduce the impact on the heating effect of the cooker while retaining the noise reduction performance.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a cookware, comprising a bottom, wherein a composite noise reduction layer is arranged on the outer wall surface of the bottom; the components of the composite noise reduction layer include magnetic metal and non-magnetic metal, and the components are as follows according to the mass percentage: magnetic metal: 1-20%; non-magnetic metal: 80-99%.

[0008] The cookware provided in the present application includes a cookware bottom, and a composite noise reduction layer is arranged on the outer wall surface of the cookware bottom. The composite noise reduction layer is mixed in a certain proportion according to the mass percentage of 1-20% magnetic metal and 80-99% non-magnetic metal, which is beneficial to improving the electromagnetic performance of the composite noise reduction layer, thereby reducing the impact on the heating effect of the cookware while retaining the noise reduction performance.

[0009] In a possible implementation, the magnetic metal includes any one of iron, cobalt, nickel and alloys thereof or a composite metal; and / or the non-magnetic metal includes any one of copper, copper alloy, aluminum and aluminum alloy or a composite metal.

[0010] In a possible implementation, the composite noise reduction layer includes, by mass percentage, the following: ferromagnetic metal: 2.5-4%; copper: 96-97.5%.

[0011] By mixing the composite noise reduction layer with a certain proportion of 2.5-4% ferromagnetic metal and 96-97.5% copper according to the mass percentage, it is beneficial to increase the electromagnetic performance of the composite noise reduction layer, thereby reducing the impact on the heating effect of the cooker while retaining the noise reduction performance.

[0012] In a possible implementation, the composite noise reduction layer includes, by mass percentage, ferromagnetic metal: 8-11%; aluminum: 89-92%.

[0013] By mixing the composite noise reduction layer with a certain proportion of 8-11% ferromagnetic metal and 89-92% aluminum according to the mass percentage, it is beneficial to increase the electromagnetic performance of the composite noise reduction layer, so that the influence on the heating effect of the pot can be reduced while retaining the noise reduction performance.

[0014] In a possible implementation, the thickness of the composite noise reduction layer ranges from 0.01 mm to 0.25 mm.

[0015] In a possible implementation, the thickness of the composite noise reduction layer ranges from 0.01 mm to 0.05 mm.

[0016] By limiting the thickness of the composite noise reduction layer, on the one hand, the problem of poor noise reduction effect caused by too thin thickness of the composite noise reduction layer can be avoided; on the other hand, the problem of affecting the normal heating use of the cookware when the thickness of the composite noise reduction layer is too thick can be avoided.

[0017] In a possible implementation, the pot bottom is provided with a magnetically conductive metal piece, and the composite noise reduction layer is provided on a surface of the metal piece away from the pot bottom.

[0018] This helps to avoid the problem that the cookware made of non-magnetic metal materials cannot be electromagnetically heated. Therefore, by arranging a magnetic metal part on the cookware, it can effectively play the role of electromagnetic heating, thereby realizing electromagnetic heating of the cookware.

[0019] In a possible implementation, the composite noise reduction layer is melt-sprayed on the outer wall surface of the pot bottom.

[0020] By melt-spraying the composite noise reduction layer onto the outer wall surface of the pot bottom, the composite noise reduction layer has the advantages of long anti-corrosion life, high bonding strength with the pot, high production efficiency, good coating quality, etc.

[0021] In a possible implementation, the porosity of the composite noise reduction layer is not greater than 2%. In this way, on the one hand, the lower the porosity, the better the density of the coating and the better the anti-corrosion performance; on the other hand, the higher the strength of the coating, the less likely it is to fall off; on the other hand, it helps to improve the appearance of the composite noise reduction layer.

[0022] In a second aspect, an embodiment of the present application provides an electromagnetic cooking utensil, comprising a heating utensil and the above-mentioned pot, wherein the electromagnetic heating utensil has a heating surface, the pot is located on the heating surface, and the pot bottom is in contact with the heating surface of the electromagnetic heating utensil through the composite noise reduction layer.

[0023] The cooker and electromagnetic cooking utensil provided in this embodiment include a cooker bottom, and a composite noise reduction layer is arranged on the outer wall surface of the cooker bottom. The composite noise reduction layer is mixed with 1-20% magnetic metal and 80-99% non-magnetic metal in a certain proportion according to the mass percentage, which is beneficial to improving the electromagnetic performance of the composite noise reduction layer, thereby reducing the impact on the heating effect of the cooker while retaining the noise reduction performance.

[0024] The construction of the present invention and other objects and advantageous effects thereof will become more apparent through the description of the preferred embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 is a schematic diagram of the structure of the cookware provided in Example 1 of the present application;

[0027] Figure 2 yes Figure 1 A partial enlarged schematic diagram of part I;

[0028] Figure 3 is a process flow chart for preparing the composite noise reduction layer provided in Example 1 of the present application;

[0029] Figure 4 This is a schematic diagram of the structure in which the cookware provided in the second embodiment of the present application is located on the electromagnetic heating device.

[0030] Description of reference numerals:

[0031] 100-cooker; 110-pot bottom; 120-composite noise reduction layer;

[0032] 200- electromagnetic cooking utensils; 210- electromagnetic heating utensils; 211- panel;

[0033] 212- bottom shell. DETAILED DESCRIPTION

[0034] Heating appliances in the related art mainly include electromagnetic heating appliances and resistance heating appliances. Electromagnetic heating appliances commonly used in daily life include induction cookers, IH (Induction Heat) rice cookers, electromagnetic pressure cookers, etc. Taking induction cookers as an example, due to the unique electromagnetic induction heating method of induction cookers, most of them use cookware made of specific materials, such as stainless steel cookware.

[0035] When an induction cooker is used together with stainless steel cookware, the cookware is mainly heated by electromagnetic wave cutting. Specifically, during the cutting process, the electromagnetic wave will cause the iron atoms on the stainless steel cookware to rub against each other, and the friction between the iron atoms will cause vibration, which will cause the cookware to generate large electromagnetic noise during the heating process, affecting the user experience.

[0036] In the related art, in order to solve the problem of high electromagnetic noise, stainless steel cookware is generally replaced with iron cookware, which produces less electromagnetic noise. However, iron cookware is prone to rust when it encounters oxygen-containing liquids, which makes it more difficult to prevent iron cookware from corrosion. Therefore, in the related art, stainless steel cookware is used, and noise reduction materials are used on the outer wall surface of the stainless steel cookware, for example, noise reduction materials such as non-ferromagnetic materials (copper layers or aluminum layers) are melt-sprayed on the outer wall surface of the bottom of the stainless steel pot. Among them, non-ferromagnetic materials refer to materials that do not have magnetic conductivity.

[0037] The above noise reduction method has effectively improved the electromagnetic noise problem and significantly reduced the electromagnetic noise. However, in the test of the heating effect of the induction cooker, it was found that after the copper layer or aluminum layer was sprayed, since the copper layer or aluminum layer is a non-magnetic material, it has a reflective effect on the magnetic field, which will cause part of the magnetic lines of force that need to reach the bottom of the pot to be reflected to the outside of the pot. The pot cannot completely absorb the magnetic lines of force, which affects the heating effect of the pot and reduces the heating efficiency of the pot.

[0038] Among them, the power for the normal operation of the electromagnetic coil disk is provided by IGBT (Insulated Gate Bipolar Transistor). As a high-power tube, IGBT can ensure the long-term safe operation of the electromagnetic coil disk under high voltage and high current conditions. At the same time, the working state of IGBT will affect the working state of EMC (ElectroMagnetic Compatibility). Among them, EMC means that the electromagnetic interference generated by the equipment or system (such as induction cooker) to the environment in the normal operation process cannot exceed a certain limit. At the same time, the induction cooker has a certain degree of immunity to the electromagnetic interference in the environment, that is, electromagnetic sensitivity.

[0039] Therefore, in order to ensure the normal heating of the cookware, the heating frequency of the electromagnetic coil disk is often increased in the related art, which will increase the power of the IGBT, and then cause the temperature rise of the IGBT to be too high, and the IGBT may be damaged. Moreover, when the temperature rise of the IGBT is too high, the EMC margin is often lower than the standard value, and even intermittent heating problems may occur.

[0040] Temperature rise refers to the temperature of the IGBT in the induction cooker being higher than the ambient temperature. When the temperature rise is too high, the IGBT will automatically stop working. Intermittent heating can protect the inside of the induction cooker, avoiding overload when the induction cooker maintains high power operation for a long time, and avoiding the problem of internal circuit boards burning out.

[0041] Based on the above technical problems, the present application provides a cooker and an electromagnetic cooking utensil, the cooker comprising a bottom, and a composite noise reduction layer is arranged on the outer wall surface of the bottom. The composite noise reduction layer is proportioned in a certain proportion according to the mass percentage including 1-20% magnetic metal and 80-99% non-magnetic metal, which is beneficial to improving the electromagnetic performance of the composite noise reduction layer, thereby retaining the noise reduction performance while reducing the impact on the heating effect of the cooker.

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Embodiment 1

[0044] Figure 1 is a schematic diagram of the structure of the cookware provided in Example 1 of the present application; Figure 2yes Figure 1 A partial enlarged schematic diagram of part I in the figure. Figure 3 This is a process flow chart for preparing the composite noise reduction layer provided in Example 1 of the present application.

[0045] Reference Figure 1 and Figure 2 As shown, the embodiment of the present application provides a cooker 100, which is suitable for an electromagnetic heating device 210. The electromagnetic heating device 210 mainly refers to a type of device that heats the cooker 100 by electromagnetic heating, such as an induction cooker, an electromagnetic rice cooker, an electromagnetic pressure cooker, etc. In this embodiment, the induction cooker is mainly used as an example for description.

[0046] The induction cooker has a cavity, specifically, the induction cooker includes a panel 211 and a bottom shell 212, the panel 211 covers the bottom shell 212, and the panel 211 and the bottom shell 212 enclose the above cavity. The cavity can be used to accommodate various electrical components such as a control board, a circuit board, an electromagnetic heating element, and a heat dissipation fan. The heat dissipation fan is used to dissipate the control board, the circuit board and the electromagnetic heating element in the cavity. The induction cooker is electrically connected to an external power supply through a power cord.

[0047] The panel 211 comprises a heating surface, and the orthographic projection of the heating surface on the surface where the electromagnetic heating element is located is located inside the electromagnetic heating element. When in use, the pot 100 is located on the heating surface, which helps to ensure effective heating of the pot 100.

[0048] The material of the bottom shell 212 can be polypropylene (PP), polybutylene terephthalate (PBT), polyester resin (PET), nylon 6 (PA6), nylon 66 (PA66) or polyphenylene sulfide (PPS) with a temperature resistance greater than 125 degrees, or the material of the bottom shell 212 can be PP, PBT, PET, PA6, PA66 or PPS plus glass fiber. The panel 211 can be a non-metallic material resistant to high temperatures, such as a high borosilicate glass panel, a ceramic panel and a microcrystalline glass panel.

[0049] Exemplarily, the bottom shell 212 may include a lower cover and an upper cover, the upper cover being a frame-shaped structure, the upper cover being covered on the lower cover, and the panel 211 being arranged on a side of the upper cover away from the lower cover. The side of the panel 211 away from the bottom shell 212 may be used to place the pot 100, thereby not only realizing the heating function of the induction cooker, but also preventing the pot 100 from directly contacting the bottom shell 212, so as to avoid the high-temperature pot 100 from scalding the bottom shell 212.

[0050] When the cooking utensil is an induction cooker, the heating element is an electromagnetic coil disk, which includes a coil disk support and a coil wound on the coil disk support; when the cooking utensil is an electric ceramic cooker, the heating element may be formed by winding a resistance heating wire. In this embodiment, the heating element is mainly described by taking the electromagnetic coil disk as an example.

[0051] Continue to refer to Figure 1 and Figure 2 As shown, the cooker 100 includes a pot bottom 110 , and a composite noise reduction layer 120 is provided on the outer wall surface of the pot bottom 110 . The pot bottom 110 contacts the heating surface of the electromagnetic heating device 210 through the composite noise reduction layer 120 .

[0052] Among them, in order to reduce the impact on the heating effect of the cooker 100, in the embodiment of the present application, the components of the composite noise reduction layer 120 may include magnetic metals and non-magnetic metals, which may include 1-20% of magnetic metals and 80-99% of non-magnetic metals in terms of mass percentage.

[0053] The sum of the mass percentage of the magnetic metal and the mass percentage of the non-magnetic metal may be 100%, or, if the composite noise reduction layer 120 contains impurities, the sum of the mass percentage of the magnetic metal and the mass percentage of the non-magnetic metal may be less than 100%.

[0054] Materials can be divided into magnetic materials and non-magnetic materials according to whether they are magnetic or not. Magnetic materials refer to materials with magnetic conductivity, and non-magnetic materials refer to materials without magnetic conductivity.

[0055] For example, the magnetic metal may include any one of iron, cobalt, nickel and their alloys or composite metals, and the non-metallic magnetic metal may include any one of copper, copper alloy, aluminum, aluminum alloy or composite metals. Composite metal refers to a mixture of two or more different metals or alloys.

[0056] Exemplarily, when the mass percentage of the magnetic metal is 1%, the mass percentage of the non-magnetic metal is 99%; when the mass percentage of the magnetic metal is 5%, the mass percentage of the non-magnetic metal is 95%; when the mass percentage of the magnetic metal is 10%, the mass percentage of the non-magnetic metal is 90%; when the mass percentage of the magnetic metal is 15%, the mass percentage of the non-magnetic metal is 85%; when the mass percentage of the magnetic metal is 20%, the mass percentage of the non-magnetic metal is 80%.

[0057] It should be noted that the specific values ​​of the mass percentage of the magnetic metal and the mass percentage of the non-magnetic metal include but are not limited to the above values, and the specific proportions can be determined according to actual needs.

[0058] Therefore, by arranging a composite noise reduction layer 120 on the outer wall surface of the pot bottom 110, and mixing the composite noise reduction layer 120 in a certain proportion according to the mass percentage including 1-20% of magnetic metal and 80-99% of non-magnetic metal, compared with the related art in which the outer wall surface of the pot bottom 110 is entirely sprayed with non-magnetic metal, the present application can not only effectively reduce electromagnetic noise under the action of non-magnetic metal with a higher mass percentage, but also add magnetic metal with a lower mass percentage, so that the present application can effectively improve the electromagnetic performance of the composite noise reduction layer 120 and the heating performance of the cookware 100 under the action of the magnetic metal, thereby retaining the noise reduction performance while reducing the impact on the heating effect of the cookware 100, avoiding the increase in the power of the IGBT, which is beneficial to avoiding the temperature rise of the IGBT and avoiding the problem of intermittent heating of the induction cooker.

[0059] In addition, compared with the noise reduction layer in the related art, the composite noise reduction layer 120 of the present application has a wider allowable thickness range, which is beneficial to processing and production, and is beneficial to improving fault tolerance in the production process.

[0060] Among them, the allowable thickness range of the composite noise reduction layer 120 means: the thickness of the composite noise reduction layer 120 can be any value within the allowable thickness range, and when the thickness of the composite noise reduction layer 120 is selected as any value within the allowable thickness range, it can be ensured that the performance of the composite noise reduction layer 120 will not change too much.

[0061] The noise reduction layer of the related art and the composite noise reduction layer 120 of the present application are compared below, wherein the noise reduction layer of the related art and the composite noise reduction layer 120 of the present application are respectively within the allowable average thickness range, and the IGBT temperature rise, EMC margin, salt spray test and heating effect in Table 1 are numerically compared:

[0062] Table 1

[0063] Allowable average thickness IGBT temperature rise EMC margin Salt spray test Heating effect copper 0.02-0.027mm 80.8k Margin 0.85db 24h normal normal Iron + Copper 0.01-0.034mm 66.3k Margin 1.27db 24h normal normal

[0064] Salt spray test is an environmental test that uses artificial simulated salt spray environment conditions created by salt spray test equipment to assess the corrosion resistance of products or metal materials. It is divided into two categories, one is the natural environment exposure test, and the other is the artificial accelerated simulated salt spray environment test. The artificial simulated salt spray environment test uses a test equipment with a certain volume space - a salt spray test chamber, and uses artificial methods in its volume space to create a salt spray environment to assess the salt spray corrosion resistance quality of the product.

[0065] It can be understood that in this embodiment, the allowable average thickness selected for the noise reduction layer in the related art and the allowable average thickness selected for the composite noise reduction layer 120 in this application may be different. For details, please refer to the allowable average thickness range of the comparative experiment shown in Table 1.

[0066] Specifically, according to Table 1, when the noise reduction layer only includes copper (the setting method of the related technology), compared with the case where the composite noise reduction layer 120 includes copper and a small amount of ferromagnetic metal (the setting method of the present application): the temperature rise of the IGBT in the related technology is higher than the temperature rise of the IGBT in the present application, the EMC margin in the related technology is lower than the EMC margin in the present application, the salt spray test in the related technology has the same result as the salt spray test in the present application, and both are normal for 24 hours, and the heating effect on the cooker 100 in the related technology is the same as the heating effect on the cooker 100 in the present application, and both are normal.

[0067] In summary, the noise reduction layer provided in the related art will cause the temperature rise of the IGBT to be too high and the margin of the EMC to be too low, thereby affecting the normal operation of the IGBT. The composite noise reduction layer 120 provided in the present application reduces the temperature rise of the IGBT and increases the margin of the EMC, thereby being able to reduce the impact on the heating effect of the cooker 100 while retaining the noise reduction performance, avoiding the increase in the power of the IGBT, thereby being beneficial to avoiding the temperature rise of the IGBT and avoiding the problem of intermittent heating of the induction cooker.

[0068] Below, for the implementation methods of the composite noise reduction layer 120 with different materials and ratios, a numerical comparison is made on the IGBT temperature rise, EMC margin, salt spray test and heating effect, assuming that the composite noise reduction layer 120 of the present application and the noise reduction layer of the related art are at the same allowable average thickness.

[0069] The first implementation is to take the case where the magnetic metal is a ferromagnetic metal and the non-magnetic metal is copper as an example, wherein the mass percentage of the ferromagnetic metal may be between 2.5-4%, and the mass percentage of the copper may be between 96-97.5%.

[0070] For example, when the mass percentage of the ferromagnetic metal is 2.5%, the mass percentage of copper is 97.5%; when the mass percentage of the ferromagnetic metal is 3%, the mass percentage of copper is 97%; when the mass percentage of the ferromagnetic metal is 3.5%, the mass percentage of copper is 96.5%; when the mass percentage of the ferromagnetic metal is 4%, the mass percentage of copper is 96%.

[0071] Specifically, in the first implementation, the noise reduction layer of the related art and the composite noise reduction layer 120 of the present application are mainly used as examples for explanation, and under the condition that the average thickness of the noise reduction layer of the related art and the composite noise reduction layer 120 of the present application are the same, the IGBT temperature rise, EMC margin, salt spray test and heating effect are numerically compared:

[0072] Table 2

[0073]

[0074] First, the noise reduction layer (100% copper, the setting method of the related art) and the composite noise reduction layer 120 (3% iron + 97% copper, the setting method of the present application) are compared: specifically, the thickness of the noise reduction layer in the related art and the composite noise reduction layer 120 of the present application is the same, both set to 0.025 mm, the noise reduction layer in the related art only includes copper, and the composite noise reduction layer 120 in the present application includes 97% copper and 3% ferromagnetic metal, the temperature rise of the IGBT in the related art is higher than the temperature rise of the IGBT in the present application, the EMC margin in the related art is lower than the EMC margin in the present application, the salt spray test in the related art has the same result as the salt spray test in the present application, and both are normal for 24 hours, and the heating effect on the cooker 100 in the related art is the same as the heating effect on the cooker 100 in the present application, and both are normal.

[0075] Next, the noise reduction layer (100% copper, the setting method of the related art) and the composite noise reduction layer 120 (10% iron + 90% copper, the setting method of the present application) are compared: specifically, the thickness of the noise reduction layer in the related art and the composite noise reduction layer 120 of the present application is the same, both set to 0.025 mm, the noise reduction layer in the related art only includes copper, and the composite noise reduction layer 120 in the present application includes 90% copper and 10% ferromagnetic metal, the temperature rise of the IGBT in the related art is higher than the temperature rise of the IGBT in the present application, the EMC margin in the related art is lower than the EMC margin in the present application, the salt spray test in the related art and the present application are both normal, and both are normal for 24 hours, the heating effect on the cooker 100 in the related art is the same as the heating effect on the cooker 100 in the present application, and both are normal.

[0076] Finally, the composite noise reduction layer 120 (iron 3% + copper 97%) and the composite noise reduction layer 120 (10% + copper 90%) of the present application are compared: specifically, the thickness of the two composite noise reduction layers 120 is the same, both set to 0.025 mm, and the temperature rise values ​​of the IGBTs corresponding to the two composite noise reduction layers 120 are close. Since the copper content in the composite noise reduction layer 120 (iron 3% + copper 97%) is slightly higher than the copper content in the composite noise reduction layer 120 (iron 10% + copper 90%), the EMC margin of the composite noise reduction layer 120 (iron 3% + copper 97%) is slightly lower than the EMC margin of the composite noise reduction layer 120 (iron 3% + copper 97%). The salt spray tests of the two composite noise reduction layers 120 are the same, both are normal for 24 hours, and the heating effects of the two composite noise reduction layers 120 on the cooker 100 are the same, and both are normal.

[0077] In addition, it should be noted that, referring to Table 2, when the ferromagnetic metal is selected at 21% and the copper non-magnetic metal is selected at 89%, since the ferromagnetic metal is selected at 21%, 21% is not within the mass percentage range of 1-20% in the present application, rusting will occur over a certain period of time. Therefore, the rationality and necessity of selecting the range of magnetic metal to be 1-20% and the range of non-magnetic metal to be between 99-80% in the present application are also verified by comparison.

[0078] In summary, according to Table 2, the noise reduction layer provided in the related art will cause the temperature rise of the IGBT to be too high and the margin of the EMC to be too low, thereby affecting the normal operation of the IGBT. The composite noise reduction layer 120 provided in the present application reduces the temperature rise of the IGBT and increases the margin of the EMC, thereby being able to reduce the impact on the heating effect of the cooker 100 while retaining the noise reduction performance, avoiding the increase in the power of the IGBT, and thus being beneficial to avoiding the temperature rise of the IGBT and avoiding the problem of intermittent heating of the induction cooker.

[0079] The second implementation is to take the case where the magnetic metal is a ferromagnetic metal and the non-magnetic metal is aluminum as an example for explanation. The mass percentage of the ferromagnetic metal can be between 8-11%, and the mass percentage of the aluminum can be between 89-92%.

[0080] For example, when the mass percentage of the ferromagnetic metal is 8%, the mass percentage of aluminum is 92%; when the mass percentage of the ferromagnetic metal is 9%, the mass percentage of aluminum is 91%; when the mass percentage of the ferromagnetic metal is 10%, the mass percentage of aluminum is 90%; when the mass percentage of the ferromagnetic metal is 11%, the mass percentage of aluminum is 89%.

[0081] Specifically, in the second implementation, the noise reduction layer of the related art and the composite noise reduction layer 120 of the present application are mainly used as examples for explanation, and under the condition that the average thickness of the noise reduction layer of the related art and the composite noise reduction layer 120 of the present application are the same, the IGBT temperature rise, EMC margin, salt spray test and heating effect are numerically compared:

[0082] Table 3

[0083]

[0084] According to Table 3, the noise reduction layer in the related art will cause the temperature rise of the IGBT to be too high and the margin of the EMC to be too low, thereby affecting the normal operation of the IGBT. The composite noise reduction layer 120 of the present application reduces the temperature rise of the IGBT and increases the margin of the EMC, thereby being able to reduce the impact on the heating effect of the cooker 100 while retaining the noise reduction performance, avoiding the increase in the power of the IGBT, and thus being beneficial to avoiding the temperature rise of the IGBT and avoiding the problem of intermittent heating of the induction cooker.

[0085] In addition, it should be noted that, referring to Table 3, when the ferromagnetic metal is selected at 25% and the aluminum non-magnetic metal is selected at 75%, since the ferromagnetic metal is selected at 25%, 25% is not within the mass percentage range of 1-20% in this application, rust will occur after a certain period of time. Therefore, the rationality and necessity of selecting the range of magnetic metal to be 1-20% and the range of non-magnetic metal to be between 99-80% in this application are also verified by comparison.

[0086] In the embodiments of the present application, the mass ratio of the materials used in actual applications includes but is not limited to the above-mentioned actual test data. For example, the test can be conducted by taking the magnetic metal as cobalt and the non-magnetic metal as copper as an example, or by taking the magnetic core metal as nickel and the non-magnetic metal as aluminum as an example. This is not further limited in the embodiments of the present application.

[0087] In one possible implementation, referring to Figure 2 As shown, the thickness T of the composite noise reduction layer 120 can range from 0.01 mm to 0.25 mm. For example, the thickness T of the composite noise reduction layer 120 can be set to 0.01 mm, 0.012 mm, 0.014 mm, 0.02 mm, 0.022 mm, 0.023 mm, 0.025 mm or any value between 0.01 mm and 0.25 mm according to actual needs, and this is not further limited in the embodiments of the present application.

[0088] In the embodiment of the present application, the thickness of the composite noise reduction layer 120 is mainly in the range of 0.01 mm-0.05 mm. For example, the thickness of the composite noise reduction layer 120 can be set to 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm or any value between 0.01 mm and 0.05 mm according to actual needs, and this is not further limited in the embodiment of the present application.

[0089] By limiting the thickness of the composite noise reduction layer 120, on the one hand, it can avoid the problem of poor noise reduction effect when the thickness of the composite noise reduction layer 120 is too thin, and on the other hand, it can also avoid the problem of affecting the normal heating use of the cooker 100 when the thickness of the composite noise reduction layer 120 is too thick.

[0090] In a possible implementation, a magnetically conductive metal piece may be disposed on the pot bottom 110 , and the composite noise reduction layer 120 is disposed on a surface of the metal piece away from the pot bottom 110 .

[0091] It should be noted that when the pot 100 is made of non-magnetic metal material, such as a copper pot or an aluminum pot, the copper pot or the aluminum pot itself cannot conduct magnetism, so the pot 100 cannot be electromagnetically heated. Therefore, in the embodiment of the present application, a magnetic metal piece is provided on the pot bottom 110, which can effectively play the role of electromagnetic heating, thereby realizing electromagnetic heating of the pot 100.

[0092] Reference Figure 3 , the preparation process of the composite noise reduction layer 120 is described.

[0093] The raw materials of magnetic metals include metal powders, and the raw materials of non-magnetic metals include metal strips. Among them, strips are strip-shaped metal materials supplied in rolls with a large aspect ratio, and the width is often 600mm for steel plates. Strips with a width greater than 600mm are called wide strips, and strips with a width less than 600mm are called narrow strips.

[0094] S01: Laying metal powder in a metal strip according to a preset ratio to form a metal strip mixed with metal powder.

[0095] The mass percentage of the non-magnetic metal can be selected from any value of 80-99%, and the mass percentage of the magnetic metal can be selected from any value of 1-20%. The preset ratio is the ratio between any value of the mass percentage of the selected non-magnetic metal and any value of the mass percentage of the selected magnetic metal. The specific values ​​of the non-magnetic metal and the specific values ​​of the magnetic metal can be selected according to actual needs.

[0096] The raw materials selected from non-magnetic metals include metal strips. Metal strips have high flexibility, which is beneficial to avoid "flying hair" and debris during the wire making process. In addition, metal strips have low shear resistance, which reduces damage to wire cutting tools and helps increase the durability of wire cutting tools.

[0097] S02: Rolling the metal strip mixed with the metal powder, that is, rolling or bending the metal strip mixed with the metal powder, and welding the closed part to form a closed metal wire.

[0098] In this step, the wire forming can be completed on a wire curling and forming device. Exemplarily, the wire curling and forming device can include a conveyor belt and a plurality of protrusions arranged at intervals on the conveyor belt, and a squeezing roller arranged above the conveyor belt, the wire is fed from a direction perpendicular to the protrusions, and is squeezed into a curved or bent shape during the process of passing between the conveyor belt and the squeezing roller. The squeezing roller can be an elastic roller or a conventional roller with elastic teeth.

[0099] S03: The metal wire mixed with the metal powder is stretched to obtain a composite noise reduction layer in the form of a metal wire. Specifically, the wire can be prepared into a wire of uniform size required in this application by a wire drawing machine.

[0100] In this way, by sequentially undergoing the rolling process and the stretching process, the quality of the wire can be improved, the amount of broken wire and broken wire can be reduced, and the qualified rate of the composite noise reduction layer 120 of the present application can be improved. It should be noted that there is no limitation on the curling degree during the rolling process, and the curling can be performed according to actual needs.

[0101] After the composite noise reduction layer in the form of a metal wire is obtained, the target wire can be obtained by detecting and removing unqualified wires and debris from the formed wire. The detection method can use a conventional visual imager or an infrared scanner to detect unqualified wires or debris online, and remove the unqualified wires and debris through a conventional removal device.

[0102] It should be noted that this step is optional.

[0103] S04: A composite noise reduction layer in the form of metal wire is melt-sprayed on the outer wall surface of the pot bottom.

[0104] In the embodiment of the present application, a spraying device may be used to spray the composite noise reduction layer 120, wherein the model and type of the spraying device are not limited. By way of example, in the present embodiment, the spraying device may be an arc spraying machine.

[0105] The arc spraying technology uses a dedicated power source to cause the charged corrosion-resistant metal wire to produce arc melting. Within 1 / 1000-1 / 10000 seconds, the high-temperature droplets of molten metal are blown, atomized, and sprayed by compressed air onto the outer wall of the pot that has been sandblasted and derusted in advance, forming a mechanical-metallurgical combined spray layer with high purity and strong bonding strength. This spraying method makes the composite noise reduction layer 120 have the advantages of long anti-corrosion life, high bonding strength between the composite noise reduction layer 120 and the pot 100, high production efficiency of the composite noise reduction layer 120, and good coating quality of the composite noise reduction layer 120.

[0106] In a possible implementation, after the composite noise reduction layer 120 is melt-sprayed on the outer wall of the pot bottom 110, the melt-spraying process often causes pores to be generated on the composite noise reduction layer 120. Therefore, in the embodiment of the present application, in order to ensure the strength and good compactness of the composite noise reduction layer 120, it is necessary to set the porosity of the composite noise reduction layer 120 to be no more than 2%. In this way, on the one hand, when the porosity of the composite noise reduction layer 120 is lower, the compactness of the coating is better and the anti-corrosion performance is better; on the other hand, the higher the strength of the coating, the less likely it is to fall off; on the other hand, it helps to improve the appearance of the composite noise reduction layer 120.

[0107] Embodiment 2

[0108] Figure 4 This is a schematic diagram of the structure in which the cookware provided in the second embodiment of the present application is located on the electromagnetic heating device.

[0109] Reference Figure 4 As shown, the embodiment of the present application further provides an electromagnetic cooking appliance 200 , which includes an electromagnetic heating appliance 210 and a pot 100 . The pot 100 is located on the heating surface of the electromagnetic heating appliance 210 , and the electromagnetic heating appliance 210 is used to heat the pot 100 .

[0110] Other technical features are the same as those in Example 1 and can achieve the same technical effects, which will not be described in detail here.

[0111] In summary, the cooker 100 and the electromagnetic cooking utensil 200 provided in this embodiment, the cooker 100 includes a pot bottom 110, and a composite noise reduction layer 120 is arranged on the outer wall surface of the pot bottom 110. The composite noise reduction layer 120 is proportioned in a certain proportion according to the mass percentage including 1-20% of magnetic metal and 80-99% of non-magnetic metal, which is beneficial to improving the electromagnetic performance of the composite noise reduction layer 120, thereby retaining the noise reduction performance while reducing the impact on the heating effect of the cooker 100.

[0112] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0113] In the description of the present invention, it should be understood that the terms "including" and "having" and any variations thereof used herein are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0114] Unless otherwise clearly specified and limited, the terms "installed", "connected", "fixed", etc. should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and it can make the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cookware, characterized in that: The pot comprises a pot bottom (110), and a composite noise reduction layer (120) is arranged on the outer wall surface of the pot bottom (110); The components of the composite noise reduction layer (120) include magnetic metal and non-magnetic metal, which include, by mass percentage: Magnetic metals: 1-20%; Non-magnetic metals: 80-99%.

2. The cookware according to claim 1, characterized in that: The magnetic metal includes any one of iron, cobalt, nickel and alloys thereof or a composite metal; And / or, the non-magnetic metal includes any one of copper, copper alloy, aluminum, and aluminum alloy, or a composite metal.

3. The cookware according to claim 2, characterized in that: The composite noise reduction layer (120) comprises, by mass percentage: Ferromagnetic metals: 2.5-4%; Copper: 96-97.5%.

4. The cookware according to claim 2, characterized in that: The composite noise reduction layer (120) comprises, by mass percentage: Ferromagnetic metals: 8-11%; Aluminum: 89-92%.

5. The cookware according to any one of claims 1 to 4, characterized in that: The thickness of the composite noise reduction layer (120) ranges from 0.01 mm to 0.25 mm.

6. The cookware according to claim 5, characterized in that: The thickness of the composite noise reduction layer (120) ranges from 0.01 mm to 0.05 mm.

7. The cookware according to any one of claims 1 to 4, characterized in that: The pot bottom (110) is provided with a magnetically conductive metal piece, and the composite noise reduction layer (120) is provided on a surface of the metal piece away from the pot bottom (110).

8. The cookware according to any one of claims 1 to 4, characterized in that: The composite noise reduction layer (120) is melt-sprayed onto the outer wall surface of the pot bottom (110).

9. The cookware according to claim 8, characterized in that: The porosity of the composite noise reduction layer (120) is no greater than 2%.

10. An electromagnetic cooking appliance, characterized in that: The invention comprises an electromagnetic heating device and the cookware according to any one of claims 1 to 9, wherein the electromagnetic heating device has a heating surface, the cookware is located on the heating surface, and the pot bottom (110) is in contact with the heating surface of the electromagnetic heating device through the composite noise reduction layer (120).

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