KR20190112946A - Cooking vessel of steel plate with improved thermal transfer efficiency - Google Patents

Abstract

According to the present invention, a steel plate cooking vessel with improved heat transfer efficiency comprises: a container body made of a steel plate material and shaped to form a space therein; a bonding layer formed on the bottom of the container body by thermal spraying; and an aluminum spray layer formed by compressing and accelerating particles of an aluminum spray material heated in a molten state on the bottom of the bonding layer. The thermal expansion coefficient of the bonding layer has a value between the thermal expansion coefficient of the container body and the thermal expansion coefficient of the aluminum spray layer to prevent peeling of the aluminum spray layer. According to the present invention, it is possible to generate uniform heat on the bottom of the cooking vessel by thermally spraying aluminum with excellent thermal conductivity on the entire bottom of the container body so that the heat generated for a heating portion of an induction stove is rapidly transferred to a non-heating portion. Through the bonding layer, the difference in thermal expansion coefficient between the container body and the aluminum spray layer can be attenuated to prevent peeling of the aluminum spray layer.

Description

Iron plate cooking vessel with improved heat transfer efficiency {COOKING VESSEL OF STEEL PLATE WITH IMPROVED THERMAL TRANSFER EFFICIENCY}

The present invention relates to an iron plate cooking vessel with improved heat transfer efficiency, and more particularly, to an iron plate cooking vessel that efficiently transfers heat from the inside of the bottom surface of the cooking vessel to the outside and prevents separation of the aluminum thermal spray layer from the container body. will be.

In general, cooking containers are often made of aluminum or stainless steel because of the corrosion problems that occur during the cooking process. Since stainless steel has corrosion resistance in itself, no separate coating is required, and aluminum is used in various coatings such as ceramic, PTTE, and PE because corrosion occurs.

However, general iron plate has a very difficult task to use as a cooking vessel. First, the corrosion appears quickly, and second, the surface hardness is not formed in the pretreatment process because the surface hardness is strong even if the coating to prevent the corrosion, the adhesion of the coating may fall off the coating layer during the cooking process may occur.

Therefore, in the case of manufacturing a cooking vessel with an iron plate, the glaze in the form of porcelain on the iron plate is subjected to a process of heating and firing at a high temperature of 800 ~ 900 ℃. Beomrang products are a good example. A common problem with these products is that the manufacturing process is complex, expensive and very difficult to clean due to food sticking to the container during the cooking process.

Induction heating devices, which are safe and have no unnecessary heat loss recently, are used in general households, so that electromagnetic induction must occur in cooking containers in order to be used in induction heating devices. Therefore, metal containers, especially magnetic containers Is needed.

A technology related to a magnetic container manufactured to be used in an induction heating apparatus has been proposed in Korean Utility Model Registration No. 0316920.

Patent document 1 discloses an induction stove cooking container such that even when a cooking container made of a different material used in an induction stove is formed by die casting or casting molding, the different materials are firmly attached without being separated from each other.

However, Patent Document 1, considering that the heating plate of the induction stove is installed at the standard diameter, it does not matter if the bottom diameter of the cooking vessel is smaller than the diameter of the heating plate, but if the heating plate is larger than the diameter of the heating plate, a non-heating portion is generated in the middle When food is on the edge, food is not ripe at the edge, and a metal plate is attached to the bottom surface of the cooking vessel made of aluminum material so that it can be used in an induction stove, and the thermal expansion coefficient of aluminum and the metal plate are different. Due to the difference in the coefficient of thermal expansion due to the heat generated during the cooking process, there is a problem that the metal plate is peeled off the bottom surface of the cooking vessel.

Utility Model Registration No. 0316920 (Registration Date: 2003.06.05.)

The present invention has been made in view of the above, the problem of the present invention, the container body is made of aluminum having excellent thermal conductivity so as to transfer the generated heat for the heating portion of the induction range to the non-heating portion at a high speed. By thermally spraying the entire bottom surface of the cooker, it is possible to generate uniform heat on the bottom of the cooking vessel, and to prevent the separation of the aluminum sprayed layer by attenuating the difference in the coefficient of thermal expansion between the container body and the aluminum sprayed layer through the bonding layer. The purpose is to provide an iron plate cooking vessel with improved heat transfer efficiency.

Iron plate cooking vessel improved heat transfer efficiency according to the present invention for achieving the above object is made of a steel plate material, the container body is formed to form a space therein; A bonding layer formed on the bottom of the container body by thermal spraying; And an aluminum thermal spraying layer formed by compressing and accelerating particles of the aluminum thermal spraying material heated in a molten state on a bottom surface of the bonding layer, wherein the thermal expansion coefficient of the bonding layer is formed in the container body to prevent peeling of the aluminum thermal spraying layer. It is characterized by having a value between a thermal expansion coefficient and the thermal expansion coefficient of the said aluminum sprayed layer.

The bonding layer may be formed by spraying any one of Ni-Al alloy, Zn-Al alloy, Al-Si alloy and Ti alloy.

The aluminum thermal spray layer may be formed to the same thickness on the bottom surface of the bonding layer.

It may include a Teflon coating layer formed on the surface of the aluminum thermal spray layer.

According to the present invention, aluminum having excellent thermal conductivity can be thermally sprayed on the entire bottom surface of the container body so that the heat generated for the heating portion of the induction stove can be rapidly transmitted to the non-heating portion, thereby generating uniform heat on the entire bottom surface of the cooking vessel. In addition, it is possible to reduce the difference in thermal expansion coefficient between the container body and the aluminum thermal spray layer through the bonding layer to prevent the aluminum thermal spray layer from peeling off.

1 is a bottom perspective view showing an iron plate cooking vessel with improved heat transfer efficiency according to the present invention.
Figure 2 is a longitudinal sectional view showing an iron plate cooking vessel with improved heat transfer efficiency according to the present invention.
3 is an enlarged view of A of FIG. 2.

The above objects, features and other advantages of the present invention will become more apparent by describing the preferred embodiments of the present invention in detail with reference to the accompanying drawings. Hereinafter, an iron plate cooking vessel having improved heat transfer efficiency according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a bottom perspective view showing an improved iron plate cooking vessel according to the present invention, Figure 2 is a longitudinal cross-sectional view showing an improved iron plate cooking vessel according to the present invention, Figure 3 is an enlarged A of FIG. It is also.

1 to 3, the iron plate cooking vessel 100 having improved heat transfer efficiency of the present invention includes a container body 110, a bonding layer 120, and an aluminum spray layer 130.

The container body 110 is formed by forming a base material of the iron plate material to be configured with a bottom surface and a side to form a space therein.

That is, the base material is formed of an iron plate material, and is formed into a container body 110 having a bottom surface and a side surface by using a forging molding apparatus.

Furthermore, the container body 110 removes oil and foreign substances remaining by cleaning the surface during the manufacturing process, thereby preventing a decrease in adhesion between the container body 110 and the aluminum sprayed layer 130.

Although not shown in the figure, a surface roughness layer formed by blasting the surface of the container body 110 is formed.

The surface roughness layer is sprayed on the surface of the inner and outer surfaces of the container body 110 using a blasting machine (not shown in the drawing), so that the oxide film layer is removed and the surface roughened the container body 110 And the adhesion between the aluminum spray layer 130 and the bonding force can be excellent.

The bonding layer 120 is formed such that the aluminum thermal spraying layer 130 is firmly fixed to the surface of the surface roughness layer (improving the bonding force).

In this case, the bonding layer 120 has a thermal expansion coefficient between the thermal expansion coefficient of the container body 110 and the thermal expansion coefficient of the aluminum thermal spraying layer 130 (for example, an intermediate value) to prevent peeling of the aluminum thermal spraying layer 130. To have.

Therefore, the bonding layer 120 reduces the difference in thermal expansion coefficient of the container body 110 and the aluminum thermal spray layer 130 by connecting the thermal expansion coefficient of the aluminum spray layer 130 to a smaller range. It is possible to prevent the aluminum spray layer 130 peeling.

At this time, the bonding layer 120 is formed by spraying a material selected from Ni-Al alloy, Zn-Al alloy, Al-Si alloy and Ti alloy having a melting point in the range of 300 ~ 1500 ℃, aluminum spray layer 130 In order to improve the bonding strength with the surface treatment can be formed roughness.

Meanwhile, the bonding layer 120 may be formed using various metals or alloys having a melting point corresponding to the melting point of the iron plate because the material of the container body 110 has a melting point of 1535 ° C.

Thus, the reason for limiting the melting point of the metal forming the bonding layer 120 is as follows. If the melting point of the metal constituting the bonding layer 120 is lower than 300 ° C, it may be lower than the actual use temperature of the cooking vessel. Therefore, there is a problem in that the bonding layer 120 is melted so that the cooking vessel cannot be used. On the other hand, when the temperature of the bonding layer 120 exceeds 1500 ° C, the melting point of the container body 110, which is mainly formed of an iron plate, is exceeded. Therefore, only part of the bonding layer 120 cannot be melted, and since the container body 110 is also melted at a temperature at which the bonding layer 120 is melted, only a part of the bonding layer 120 is melted to form the aluminum spray layer 130. It can harden the bond.

The aluminum spray layer 130 is formed on the bonding layer 120 by accelerating particles of the aluminum spray material heated in a molten state with compressed air or gas so that the thickness of the outer and center parts is the same.

In this case, the aluminum spray layer 130 may be formed by any one method selected from arc spraying, plasma spraying, flame spraying and HVOF spraying.

Arc spray (Arc spray) is two aluminum wires charged to the anode and cathode by DC electricity is melted by the arc energy of about 4100 ℃, and impinges on the iron plate base material 100 by compressed air of about 150m / sec It is a way to form a coating film.

Plasma Spray is a low voltage, high current electrical energy ionized by mixing inert gas such as argon, hydrogen, nitrogen or helium in the torch nozzle and electrode chamber via DC + and DC- charged cables. And plasma energy consisting of neutrons and protons, and transfer the powdered aluminum thermal spraying material in a moderate amount and uniform velocity in a flame at 16,500 ° C. to impinge on the iron plate base material 100 by high temperature thermal energy and high speed velocity energy. To form a coating film.

Flame spray is a spraying method that forms a film by using a strong spray shock by increasing the spray speed to flame spray and uses fuel gas such as flame, and combustion occurs inside the pipe and the generated combustion gas is flowed through the nozzle at high speed. While spraying, the raw material powder is sprayed at high speed to the injection gas, heated, and melted at high speed to form a coating film.

HVOF spray (High Velocity Oxy-Fuel Spray) is called high speed spray and it is a flame generated by burning oxygen and fuel (propane, propylene, hydrogen, kerosene, etc.) in the chamber. After the molten metal is melted by heat energy of about 3000 ° C., it is sprayed onto the base plate 100 at a high speed of 700 m / sec to form a coating film.

In addition, the aluminum thermal spraying layer 130 may form more fine particles by changing air pressure or gas pressure during formation. For example, when the aluminum spray layer 130 is formed, the air pressure or the gas pressure may be more strongly sprayed in the early and later stages, thereby making the particles more fine in the initial and late stages of the injection.

On the other hand, although not shown in the drawings, the Teflon coating layer may be coated on the surface of the container body 110 and the aluminum thermal spray layer 130. The Teflon coating layer is formed on the surface of the aluminum thermal spray layer 130, and when the coating raw material penetrates into the pores and adheres to the aluminum thermal spraying layer 130 where many pores are formed, there is no peeling phenomenon of the coating and the life of the coating also increases. . As the Teflon coating layer, a primer coating layer is applied thereto, and a coating layer for improving wear resistance optical properties and a fluororesin coating layer are applied thereto, and a coating layer for giving gloss while preventing the workpiece from sticking to the surface. It includes a top coat layer formed on the top.

Thus, the iron plate cooking vessel 100 with improved heat transfer efficiency according to the present invention even if the heating portion of the induction stove is concentrated to form a thick aluminum spray layer 130 with excellent thermal conductivity on the bottom surface of the container body 110 Uniform heat may be generated on the bottom surface of the cooking vessel, and the difference in thermal expansion coefficient between the container body 110 and the aluminum thermal sprayed layer 130 is interposed between the container body 110 and the aluminum thermal sprayed layer 130. Attenuation through the bonding layer 120 may prevent peeling of the aluminum thermal spraying layer 130.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

100: iron plate cooking vessel
110: container body
120: bonding layer
130: aluminum sprayed layer

Claims (4)

A container body made of a steel plate material and shaped to form a space therein;
A bonding layer formed on the bottom of the container body by thermal spraying; And
An aluminum spray layer formed by compressing and accelerating particles of the aluminum thermal spray material heated in a molten state on a bottom surface of the bonding layer,
The thermal expansion coefficient of the bonding layer has a value between the thermal expansion coefficient of the container body and the thermal expansion coefficient of the aluminum thermal spray layer to prevent the peeling of the aluminum thermal spray layer, characterized in that the heat transfer efficiency improved iron plate cooking vessel.
The method of claim 1,
The bonding layer is an iron plate cooking vessel with improved heat transfer efficiency, characterized in that formed by spraying any one material of Ni-Al alloy, Zn-Al alloy, Al-Si alloy and Ti alloy.
The method of claim 1,
The aluminum thermal spray layer is an iron plate cooking vessel with improved heat transfer efficiency, characterized in that formed on the bottom of the bonding layer with the same thickness.
The method of claim 1,
The iron plate cooking vessel with improved heat transfer efficiency, characterized in that it comprises a Teflon coating layer formed on the surface of the aluminum thermal spray layer.

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