JPH08112207A - Frying pan - Google Patents

Abstract

PURPOSE: To restrain heat from being transmitted to a lid and handle to be prevented from overheat more than necessary by selectively using a carbon material as a satisfactory heat transmitting material for a frying pan having a multilayered structure formed of stainless steel plates sandwiching the satisfactory heat transmitting material and thinning a portion or all of the carbon material on the body side part. CONSTITUTION: A frying pan body 11 has a circular opening part 12 and a U-shaped section defined by the bottom part 13 and side part 14. A handle 15 is mounted to the side part 14 by a jointing means like welding. The body 11 has a three-layered structure having a pair of front and rear stainless steel sheets 21, 22 worked to have a tapered U-shaped section and a carbon member 23 sandwiched by the sheets 21, 22. The carbon member 23 on the side part 14 is formed thinner than the width of a cavity defined by the sheets 21, 22 over the whole length of the side part 14 to form a cavity part 24 in which the carbon member 23 is not received on the outer wall surface 22 side of the body 11, so that the heat transmission to the lid and handle 15 is restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frying pan having an improved structure and also applicable to electromagnetic induction heating cooking (hereinafter, electromagnetic induction heating cooking is abbreviated as "electromagnetic cooking", A frying pan applicable to induction heating cooking is abbreviated as "electromagnetic cooking frying pan").

[0002]

2. Description of the Related Art As materials for frying pans, non-ferrous metals such as copper and aluminum having high thermal conductivity, and steels such as stainless steel, mild steel and carbon steel having excellent corrosion resistance are used.

Of these, materials having high thermal conductivity allow heat to pass through efficiently and can be cooked efficiently, but if there is uneven heating due to gas or electricity, it is directly reflected in the heat transfer to the food to be cooked. However, there were drawbacks such as uneven cooking between the part where the heat flow was too good and the part where the heat flow was bad. Also,
There were also inconveniences such as overheating of the lid and handle, deterioration of parts such as plastic and wood, and burns to cooks.

On the other hand, a material having a low thermal conductivity such as stainless steel has a poor thermal efficiency and a large amount of waste due to heat radiation, and the passage of heat is poor so that cooking is difficult.

In order to solve such inconvenience, in recent years, for example, a so-called clad steel in which aluminum is sandwiched between stainless steels, or a laminated material in which mild steel is sandwiched between aluminums is used, or a bottom portion of aluminum and stainless steel is used. It has been devised to have a multilayer structure.

[0006] However, these cannot be expected to prevent overheating, and of course, it is not possible to expect the effect of the purpura or the texture of the cooking (wrapping) of the oven.

Further, an electromagnetic induction heating tool using a spirally wound heating coil, which has been widely used in recent years, mainly heats a magnetic material arranged at the bottom of the frying pan body by generating an eddy current. In a frying pan using things,
There is not much choice in the thermal conductivity of the metal element or alloy,
For example, in the case of a combination of stainless steel and aluminum, heat transfer to the side surface of the frying pan body can be expected, but prevention of overheating cannot be expected. In the case of stainless steel only,
The heat transfer to the side surface of the frying pan body becomes poor, which is inconvenient for soaking the entire food to be cooked. Furthermore, in any case, the uneven effect after the heating is stopped cannot be obtained.

[0008]

The problem to be solved by the present invention is that the heat transfer to the food to be cooked is good, and moreover, soaking can be achieved, and the food is heated more than necessary. It has a structure that can suppress heat transfer to the lid and handle that you dislike, and can also obtain a purplishing effect and a texture of batter-wrapping,
Another object is to provide a frying pan that can be applied to electromagnetic cooking.

[0009]

The above-mentioned problems include a container-shaped main body whose cross section is substantially U-shaped at the bottom and side surfaces,
In a frying pan having a multilayer structure in which the main body sandwiches a good heat transfer material with stainless steel plates, a carbon material is selectively used as the good heat transfer material, and a part or all of the carbon material on the side surface of the main body is thinned. The problem is solved by the frying pan of the present invention, which is characterized in that voids are provided in which no carbon material is present.

In the frying pan of the present invention, the carbon material and the stainless steel plate can be joined by brazing, diffusion joining, or the like, but they can be joined together in a good state just by bringing them into contact with each other.

In the frying pan of the present invention, a carbon material having a metal carbide layer on the surface layer portion can be used as the carbon material. In this case, as the metal carbide, one or two of the same as the stainless steel component elements is used.
Carbides of more than one element can be used.

Further, in the frying pan of the present invention, as the carbon material, a carbon material having a layer containing a noble metal element at least in the surface layer portion can be used.

Alternatively, as the carbon material, a carbon material having a layer containing aluminum or an aluminum alloy in at least the surface layer portion can be used.

Furthermore, in the frying pan of the present invention, at least the stainless steel plate on the outer wall surface side of the main body of the stainless steel plates can be made of a magnetic material.

[0015]

With the above structure, good conductivity can be achieved by joining a carbon material having a higher thermal conductivity to stainless steel (having a thermal conductivity of about 20 W / mK at room temperature) having poor heat transfer. It is possible to obtain heat transfer and soaking. Moreover, since the carbon material having a relatively high heat capacity is used, an uneven coloring effect is obtained, and since the carbon material is used for the bottom portion and the side surface portion, the texture of the oven cooked (wrapping) is produced. There is also. Further, the carbon material is more likely to suppress heat transfer to the lid and the handle as compared with the case of using aluminum or clad steel, and part or all of the carbon material on the side surface of the main body is thinned so that the carbon material does not exist. Since the gap is provided, the effect of further suppressing heat transfer to the lid and the handle can be obtained.

Further, in the present invention, the carbon material and the stainless steel plate can be joined only by contact, but in this case, the heat of the stainless steel and the carbon material is higher than in the case of brazing or diffusion joining. The effect of alleviating the inconvenience of the joint due to the difference in expansion and mutual diffusion and the deterioration of the material can be obtained.

Further, in the present invention, a carbon material having a metal carbide layer on the surface layer portion can be used as the carbon material, but in this case, it can occur at a sudden high temperature such as baking. , The effect of suppressing the mutual diffusion and reaction of the components of the carbon material and stainless steel, such as carburizing. In particular, it is possible to prevent the carbon material from being involved in a decrease in the amount of chromium due to the reaction of chromium with carbon that causes intergranular corrosion, and to have a high reactivity with carbon such as stainless steel components such as titanium and niobium and the carbon material. It is possible to prevent the reaction with, and thus prevent deterioration of the characteristics of stainless steel such as corrosion resistance or deterioration of the carbon material.

Furthermore, in the present invention, a carbon material having a layer containing a noble metal element at least in the surface layer portion can be used as the carbon material. In this case, the carbon material and stainless steel are in contact with each other. Even if they are joined in the state, or in the state of being brazed or diffusion-bonded, the good conductivity and soaking effect are further enhanced.

In the present invention, a carbon material having a layer containing aluminum or an aluminum alloy at least in the surface layer portion can be used as the carbon material. In this case as well, the carbon material and the stainless steel are in contact with each other. Even if they are joined in the above state, or if they are joined in the state of brazing or diffusion joining, the good conductivity and soaking action are further enhanced.

Further, in the present invention, at least the stainless steel plate on the outer wall surface side of the main body among the stainless steel plates can be made of a magnetic material. In this case, a spirally wound heating coil which has been widely used in recent years is used. It has excellent applicability to electromagnetic cooking using the electromagnetic induction heating tool used. In this case, the stainless steel plate on the inner wall surface side of the main body may be magnetic or non-magnetic. Of course, non-magnetic stainless steel may be used for electromagnetic cooking, and the present invention does not exclude these cases.

[0021]

FIG. 1 is a schematic partial sectional view showing an example of a frying pan of the present invention in which only the main body is sectioned, and FIG. 2 is an enlarged side view of the main body of the embodiment of FIG. 1 and its periphery. 3 is a schematic partial enlarged cross-sectional view shown in FIG. 3 to 12 are
FIG. 3 is a schematic partial enlarged cross-sectional view of a modified example of the frying pan of the present invention, in which a modified example of the embodiment of FIG. 1 is enlarged and shown only in the side surface of the main body and its periphery, as in FIG. 2. 2 to 12, the same elements as those of FIG. 1 are represented by the same reference numerals, and the modified examples of FIGS.
It has the same structure as the embodiment of FIGS. 1 and 2 except for the shape of 3.

In the embodiment shown in FIGS. 1 and 2, reference numeral 11 contains a food (work to be cooked), and the food is supplied by an appropriate heating means such as gas, electric resistance heating, a planar heating element, or an electromagnetic cooktop. Which is a frying pan body for cooking, has a circular opening 12, and a bottom 13 and a side 14 form a U-shaped container in cross section. Reference numeral 15 is a handle attached to the side surface portion 14 of the main body 11 by an appropriate joining means such as welding or riveting (not shown). Although not shown, the lid can be detachably engaged so as to close the opening 12 of the main body 11 during cooking or storage.

The main body 11 has a pair of front and back stainless steel thin plates 21 and 22 processed to have a tapered U-shaped cross section, and also has a tapered U-shaped cross section. However, it has a three-layer structure with the carbon member 23 sandwiched between the thin plates 21 and 22. The thin plates 21 and 2 are
The thickness of the gap formed by 2 may be the same or different between the bottom portion 13 and the side surface portion 14.

The carbon member 23 of the side surface portion 14 of the frying pan body 11 is thinned over the entire length of the side surface portion 14 to a thickness smaller than the thickness that fills the cavity formed by the stainless steel thin plates 21 and 22. On the outer wall surface 22 side of the frying pan body 11, a void portion 24 in which no carbon member is housed is formed, which imparts an effect of suppressing heat transfer to the lid and the handle.

The shapes and volumes of the carbon member 23 and the voids 24 can be freely selected. In the modification of FIG. 3, the normal depth of the cooked food to be heated, which is accommodated in the frying pan body 11, can be selected. In consideration of this, the length of the carbon member 23 is set to about half the length of the carbon member 23 of FIG.
A void portion 24 is formed on the entire upper portion and lower portion of the outer wall surface 22 side. Moreover, in the modification of FIG.
A void portion 24 is formed only on the outer wall surface 22 side of the upper part of the.

In the modified examples of FIGS. 5 to 9, the outer wall surface of the carbon member 23 is tapered, and in the modified example of FIG. 5, the cross section having the upper end side as the bottom surface over the entire length of the side surface portion 14. A triangular annular void portion 24 is formed. In the modification of FIG. 6, the carbon member 2 is provided on the upper portion of the side surface portion 14.
An annular void portion 24 having a rectangular cross section and a triangular cross section is formed in the lower portion of the side surface portion 14. In the modification of FIG. 7, an annular void portion 24 having a triangular cross section is formed only on the upper portion of the side surface portion 14. FIG.
In the modified example of FIG.
An annular void portion 24 having a rectangular cross section and a triangular cross section is formed in the lower portion of the side surface portion 14. Further, in the modification of FIG. 9, an annular void portion 24 having a trapezoidal cross section is formed only on the upper portion of the side surface portion 14.

In the modified examples of FIGS. 10 to 12, a plurality of annular grooves or a single spiral groove having an appropriate cross section is formed on the outer wall surface side of the carbon member 23. Among them, in the modification of FIG. 10, a plurality of annular grooves or a single spiral groove having a rectangular cross section are bored along the entire length of the outer wall surface side of the carbon member 23 to form the void portion 24. ing. In the modification of FIG. 11, a plurality of annular grooves having a rectangular cross section or a single spiral groove is bored in the upper portion on the outer wall surface side of the carbon member 23 to form the void portion 24. FIG.
In the second modification, a plurality of annular grooves or a single spiral groove having a triangular cross section are bored along the entire length on the outer wall surface side of the carbon member 23 to form the void portion 24.

Stainless steel plates 21 and 2 used in the present invention
It is suitable that the thickness of 2 is about 0.1 mm to 3 mm, and the material is austenitic stainless steel such as SUS304, martensitic stainless steel such as SUS410, ferritic stainless steel such as SUS430, and others. Austenite / ferrite type, precipitation hardening type stainless steel can be used. In the present invention, at least the stainless steel plate 21 on the outer wall surface side of the main body may be a stainless steel plate which is a magnetic material. As this magnetic stainless steel sheet, ferritic, martensitic or austenitic / ferritic stainless steels having ferromagnetism are usually used, but other stainless steels such as precipitation hardening type and austenitic type also have magnetic properties. , These may be used. in this case,
The stainless steel plate 21 on the inner wall surface side of the main body may or may not have magnetism.

It is preferable that the carbon member 23 used in the present invention has good conductivity, and the carbon member 23 has room temperature (about 298) which is a cooking temperature range.
K) to 400 ° C (about 673K), thermal conductivity is 80
A carbon material that maintains W / m · K or more is preferable. Specifically, an appropriate material is selected and used from an isotropic graphite material having good heat conduction homogeneity, a carbon fiber reinforced carbon composite material, a flexible graphite sheet (including laminated products), and the like. A suitable thickness is about 3 mm to 20 mm, and in particular 5 mm or more is preferable for achieving soaking.

In the present invention, as the carbon member 23, a carbon material having a metal carbide layer on the surface layer portion can be used. As the metal carbide, the carbon member 2
3 and the stainless steel thin plates 21 and 22, the effect of suppressing the solid-phase reaction at the boundary surface,
In particular, one or two of the same elements as the above stainless steel constituent elements
It is preferably a carbide of one or more elements, and in this case, for example, iron, chromium, nickel, titanium, boron, silicon, tantalum, niobium, manganese, molybdenum, aluminum, zirconium, copper, lead, tungsten, cobalt, vanadium, etc. A layer of carbide of one or more elements selected from is formed.

The method for forming the metal carbide layer may be appropriately selected depending on the kind of the metal carbide. For example, a metal or a metal compound coated on the surface of the carbon member or impregnated in the surface layer of the carbon member, or Conversion method in which these coating materials or impregnating liquids, melts, steams, etc. are reacted with the carbon member (including the so-called CVI method, sol-gel method, etc.); the metal carbide coating material is applied on the surface of the carbon member and dried. , Or a method of impregnating the surface layer of the carbon member with an impregnating solution of a metal carbide and drying it; a method of depositing a layer of the metal carbide on the surface of the carbon member by a chemical vapor deposition method, a thermal spraying method, or the like; can do. A suitable thickness of the metal carbide layer is about 1 to 50 μm.

Further, in the present invention, the carbon member 2
As 3, a carbon material having a layer containing a noble metal element in at least the surface layer portion can be used. The layer containing the noble metal element may be obtained by, for example, melting copper, silver, or gold and impregnating the carbon member (a state in which the noble metal element partially or wholly reacts with the carbon material may be used, but the state in which the noble metal element is normally impregnated is preferable. Or a physical vapor deposition method (PVD) such as vacuum deposition of copper, silver or gold on the surface of the carbon member.
Method) or the like to form a coating layer. The thickness of the layer containing the noble metal element is not particularly limited, but about 1 to 50 μm is suitable.

Further, in the present invention, the carbon member 2
As 3, a carbon material having a layer containing aluminum or an aluminum alloy in at least the surface layer portion can be used. This layer containing aluminum or an aluminum alloy may be obtained by melting aluminum or an aluminum alloy and impregnating it into a carbon member (a state in which aluminum or an aluminum alloy partially or wholly reacts with a carbon material, or a state of being impregnated). Or a coating layer of aluminum or an aluminum alloy may be formed on the surface of the carbon member. The thickness of the layer containing aluminum or aluminum alloy is not particularly limited, but about 1 to 50 μm is suitable.

With the structure of the main body 11 of FIGS. 1 to 12 as described above, the stainless steel plates 21 and 22, the carbon member 23.
Is formed by ordinary machining, and after fitting them, predetermined portions of the steel plates 21 and 22 may be joined by welding or the like. Further, it is possible to leave the surfaces in contact with each other without using any special means for joining the stainless steel and the carbon.

[0035]

According to the frying pan of the present invention, by joining a carbon material to stainless steel, good conductivity and soaking can be obtained, heat transfer to the food to be cooked can be improved, and soaking cooking is possible. Is possible. Further, the carbon material is more likely to suppress heat transfer to the lid and the handle as compared with the case of aluminum or clad steel, and a part or all of the carbon material on the side surface of the main body is thinned to form a void in which the carbon material does not exist. The heat transfer to the lid and the handle can be further suppressed, and the deterioration of the parts and the burner's burn can be further prevented.

Further, since the carbon material having a relatively high heat capacity is used, the uneven effect can be obtained.

Further, since the carbon material is provided on the bottom portion and the side surface portion, it is possible to obtain the cooking effect of the oven cooking (wrapping) style, which is a traditional rice cooking technique.

Furthermore, in the present invention, the carbon material and the stainless steel plate can be joined only by contact, but in this case, the heat of the stainless steel and the carbon material is higher than in the case of brazing or diffusion joining. The effect of alleviating the inconvenience of the joint due to the difference in expansion and mutual diffusion and the deterioration of the material can be obtained.

In the present invention, a carbon material having a metal carbide layer on the surface layer portion can be used as the carbon material, but in this case, it can occur at a sudden high temperature such as baking. , It is possible to suppress mutual diffusion and reaction of components of the carbon material and stainless steel such as carburization. In particular, it is possible to prevent the carbon material from being involved in a decrease in the amount of chromium due to the reaction of chromium with carbon that causes intergranular corrosion, and to have a high reactivity with carbon such as stainless steel components such as titanium and niobium and the carbon material. It is possible to prevent the reaction with, and thus prevent deterioration of the characteristics of stainless steel such as corrosion resistance or deterioration of the carbon material.

Further, in the present invention, a carbon material having a layer containing a noble metal element at least in the surface layer portion can be used as the carbon material. In this case, the carbon material and the stainless steel are in contact with each other. Even if they are joined together, or if they are joined together in the state of brazing or diffusion joining, the effect of improving good conductivity and soaking is further enhanced.

Furthermore, in the present invention, as the carbon material, a carbon material having a layer containing aluminum or an aluminum alloy in at least the surface layer portion can be used. In this case, the carbon material and the stainless steel are also used. Even if they are joined in contact with each other, or joined in the state of brazing or diffusion joining, the good conductivity and soaking effect are further enhanced.

Further, in the present invention, at least the stainless steel plate on the outer wall surface side of the main body can be made of a magnetic material among the stainless steel plates. In this case, a spirally wound heating coil which has been widely used in recent years is used. It has excellent applicability to electromagnetic cooking using the electromagnetic induction heating tool used.

Of course, since the inner and outer surfaces of the main body which face the heat source and come into contact with the food to be cooked are made of stainless steel, it is essential to use stainless steel such as corrosion resistance due to passivation, oxidation resistance, and a beautiful appearance. The effect of can be expected.

[Brief description of drawings]

FIG. 1 is a schematic partial cross-sectional view showing an example of a frying pan of the present invention, in which only the main body is shown in cross section.

FIG. 2 is a schematic partial enlarged cross-sectional view showing an embodiment of a frying pan of the present invention, which is an enlarged view of the side surface portion of the main body of the embodiment of FIG. 1 and its periphery.

FIG. 3 is a schematic partial enlarged cross-sectional view of a modified example of the frying pan of the present invention, in which a modified example of the embodiment of FIG. 1 is enlarged and shown only in a side surface portion of the main body and its periphery, as in FIG.

FIG. 4 is a schematic partial enlarged cross-sectional view of a modified example of the frying pan of the present invention, in which a modified example of the embodiment shown in FIG.

FIG. 5 is a schematic partial enlarged cross-sectional view of a modified example of the frying pan of the present invention, in which a modified example of the embodiment of FIG. 1 is enlarged and shown only in a side surface portion of the main body and the periphery thereof.

FIG. 6 is a schematic partial enlarged cross-sectional view of a modified example of the frying pan of the present invention, in which a modified example of the embodiment of FIG. 1 is enlarged and shown only in the side surface of the main body and its periphery, as in FIG.

FIG. 7 is a schematic partial enlarged cross-sectional view of a modified example of the frying pan of the present invention, in which a modified example of the embodiment of FIG. 1 is enlarged and shown only in the side surface of the main body and its periphery, as in FIG.

FIG. 8 is a schematic partial enlarged cross-sectional view of a modified example of the frying pan of the present invention, in which a modified example of the embodiment of FIG. 1 is enlarged and shown only in the side surface of the main body and its periphery, as in FIG.

9 is a schematic partial enlarged cross-sectional view of a modified example of the frying pan of the present invention, in which a modified example of the embodiment of FIG. 1 is enlarged and shown only in a side surface portion of the main body and the periphery thereof.

10 is a schematic partial enlarged cross-sectional view of a modified example of the frying pan of the present invention, in which a modified example of the embodiment of FIG. 1 is enlarged and shown only in a side surface portion of the main body and its periphery, as in FIG.

11 is a schematic partial enlarged cross-sectional view of a modified example of the frying pan of the present invention, in which a modified example of the embodiment of FIG. 1 is enlarged and shown only in the side surface of the main body and its periphery, as in FIG.

FIG. 12 is a schematic partial enlarged cross-sectional view of a modified example of the frying pan of the present invention, in which a modified example of the embodiment of FIG. 1 is enlarged and shown only in a side surface portion of the main body and the periphery thereof.

[Explanation of symbols]

 11 Frying Pan Main Body 12 Opening 13 Bottom 14 Side Side 15 Handle 21 Stainless Steel Plate 22 Stainless Steel Plate 23 Carbon Member 24 Void

Claims (7)

[Claims] 1. A frying pan having a multi-layered structure including a container-shaped main body having a substantially U-shaped cross section at the bottom and side surfaces, the main body having a multilayer structure in which a good heat transfer material is sandwiched between stainless steel plates. A frying pan, wherein a carbon material is selectively used as a material, and a part or all of the carbon material on the side surface of the main body is thinned to provide a void in which the carbon material does not exist. 2. The frying pan according to claim 1, wherein the carbon material and the stainless steel plate are contact-joined to each other. 3. The frying pan according to claim 1 or 2, wherein a carbon material having a metal carbide layer on a surface layer portion is used as the carbon material. 4. The frying pan according to claim 3, wherein the metal carbide is the same as the stainless steel constituent element.
A frying pan characterized by being a carbide of one kind or two or more kinds of elements. 5. The frying pan according to claim 1 or 2, wherein a carbon material having a layer containing a noble metal element at least in a surface layer portion is used as the carbon material. 6. The frying pan according to claim 1 or 2, wherein the carbon material is a carbon material having a layer containing aluminum or an aluminum alloy in at least a surface layer portion. 7. The frying pan according to claim 1, wherein at least the stainless steel plate on the outer wall surface side of the main body of the stainless steel plate is a magnetic body.