JPH0884660A - Pan - Google Patents

Abstract

PURPOSE: To enhance the heat transfer and soaking to a food to be cooked, suppress the heat transfer to a lid or handle, and also provide heat retaining and steaming effects by using a carbon material having a metal carbide layer on the surface layer part as a good heat transfer material, and connecting the carbon material to a stainless steel by contact. CONSTITUTION: A carbon material 23 having a high heat conductivity is connected to stainless steel plates 21, 22, whereby good heat conducting and soaking effects can be provided. Since the carbon material 23 having a relatively high thermal capacity is used, heat retaining and steaming effects after stop of heating can be provided. The heat transfer to a lid 16 or handle 15 can also be suppressed. The carbon material 23 is connected to the stainless steel plates 21, 22 only by contact, whereby a defect in the connecting part between the stainless steel 21, 22 and the carbon material 23, or the deterioration of the materials can be moderated. Further, since a metal carbide layer is provided on the surface layer part of the carbon material 23, the mutual diffusion or reaction between the components of the carbon material 23 and the stainless steel 21, 22 can be suppressed.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a two-handed pan (including casserole, sukiyaki pan, tempura pan, steamer, hot plate, etc.), one-hand pan (including sauce pan, milk pan, etc.), etc. A pan having an improved structure applicable.

[0002]

2. Description of the Related Art Copper, which has high thermal conductivity, is used as a pot material.
Non-ferrous metals such as aluminum, steel such as stainless steel with excellent corrosion resistance, ceramics, and crystallized glass 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, materials having low thermal conductivity such as stainless steel, pottery, and crystallized glass can be expected to have heat retention and unevenness after heating is stopped, but the thermal efficiency at the time of heating is poor and waste due to heat radiation is wasted. It is difficult to cook because the heat increases and the heat flow is poor.

In order to eliminate such inconvenience, in recent years, for example, so-called clad steel in which aluminum is sandwiched by stainless steel, or a laminated material in which mild steel is sandwiched by aluminum is used, or the pan bottom is made of aluminum and stainless steel. It has been devised to have a multi-layer structure.

However, these cannot be expected to prevent overheating, and, of course, neither heat retention nor unevenness effect can be obtained after heating is stopped.

[0007]

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. You can suppress heat transfer to the lid or handle you dislike to some extent,
In addition, it is to provide a pan having a structure that can retain heat even after heating is stopped and also have an effect of purging.

[0008]

The above-mentioned problems include a container-shaped main body whose cross section is substantially U-shaped at the bottom and side surfaces,
In the pan having a multilayer structure in which the main body sandwiches a good heat transfer material with a stainless steel plate, as the good heat transfer material, a carbon material having a metal carbide layer in the surface layer portion is selectively used,
This problem is solved by the pan of the present invention, which is characterized in that the carbon material and the stainless steel plate are joined by contact.

[0009]

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 a carbon material having a relatively high heat capacity is used, it is possible to obtain the effect of keeping heat even after heating is stopped and the effect of uneven distribution. Further, heat transfer to the lid or handle can be suppressed to some extent as compared with the case of using aluminum or clad steel.

Further, since the carbon material and the stainless steel plate are joined only by contact, the inconvenience of the joint portion due to the difference in thermal expansion between the stainless steel and the carbon material and mutual diffusion can be obtained, as compared with the case of brazing or diffusion joining. The effect of alleviating the deterioration of is obtained.

Further, since the metal carbide layer is provided on the surface layer of the carbon material, mutual diffusion and reaction of components of the carbon material and the stainless steel such as carburization which can occur under sudden high temperature such as firing. The effect of suppressing 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.

[0012]

1 and 2 are schematic partial sectional views showing an example of a pan according to the present invention in which only a main body is depicted in section.

In the embodiment of FIG. 1, reference numeral 11 is a main body for accommodating a food (object to be cooked) and cooking the food by an appropriate heating means such as gas or electricity, and having a circular opening 12. Then, the bottom portion 13 and the side surface portion 14 form a container having a U-shaped cross section. Reference numeral 15 is welded to the side surface portion 14 of the main body 11,
It is a handle attached by an appropriate joining means such as riveting (not shown). Reference numeral 16 is a lid that is detachably engaged so as to close the opening 12 of the main body 11.

The body 11 comprises a pair of front and back stainless steel thin plates 21 and 22 which are deep-drawn so as to have a U-shaped cross section.
And this is also processed so as to have a U-shaped cross section, and the thin plate 2
It has a three-layer structure with a carbon member 23 sandwiched between 1 and 22.

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.

It is preferable that the carbon member 23 used in the present invention has good conductivity, and it is a room temperature (about 298) which is a cooking temperature region.
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.
Further, the bottom portion 13 and the side surface portion 14 may have different thicknesses.

In the present invention, a metal carbide layer is provided on the surface layer of the carbon member 23. Examples of the metal carbide include carbon member 23 and stainless steel thin plates 21 and 2.
As a material for exhibiting the effect of suppressing the solid phase reaction at the boundary surface with 2, it is particularly preferable that it is a carbide of one kind or two or more kinds of elements which are the same as the above-mentioned stainless steel component elements. In this case, for example, Iron, chromium, nickel, titanium, boron, silicon, tantalum, niobium, manganese, molybdenum, aluminum, zirconium, copper,
A layer of a carbide of one or more elements selected from lead, tungsten, cobalt, vanadium, etc. is formed.

The method for forming the metal carbide layer may be appropriately selected according to 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, vapors, etc. are reacted with the carbon member (so-called CVI method, sol-gel method, etc.); , 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.

When the same elements as those in FIG. 1 are represented by the same symbols,
In the embodiment shown in FIG. 2, the side wall portion 14 of the pan main body 11 is provided with the void portion 24 in which the carbon member is not contained, which has the effect of further suppressing heat transfer to the lid and the handle. Granted.

The length of the cavity 24 may be equal to or less than the length of the side surface 14, and the engaging position of the lid 16 which is the object of heat insulation, the mounting position of the handle 15, and the cooking target of the heating housed in the main body 11. It may be appropriately determined in consideration of the normal depth of food.

With the structure of the main body 11 shown in FIGS. 1 and 2 as described above, the stainless steel plates 21, 22 and the carbon member 23 are formed by ordinary machining, and the steel plates 2 are fitted together.
It suffices to join predetermined portions 1 and 22 by welding or the like. Also,
Without using any special means for joining stainless steel and carbon,
Since the surfaces are joined in contact with each other, the assembly process is greatly simplified.

[0022]

[Effects of the Invention] According to the pan of the present invention, by joining a carbon material to stainless steel, good conductivity and soaking effect can be obtained, heat transfer to the food to be cooked is improved, and further soaking cooking is performed. Is possible.

Further, since the carbon material having a relatively high heat capacity is used, it is possible to obtain the effect of heat retention and unevenness after the heating is stopped.

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 style which is a traditional rice cooking technique.

Furthermore, since the carbon material and the stainless steel plate are joined only by contact, the inconvenience of the joint portion due to the difference in thermal expansion between the stainless steel and the carbon material and mutual diffusion, as compared with the case of brazing or diffusion joining, The effect of alleviating the deterioration of the material is obtained.

Further, since the metal carbide layer is provided on the surface layer of the carbon material, mutual diffusion and reaction of the components of the carbon material and the stainless steel such as carburization, which can occur under sudden high temperature such as air burning. Can be suppressed. 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.

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, the corrosion resistance due to the passive formation, the oxidation resistance, the beautiful appearance, etc. The effect of can be expected.

Further, when the side surface is provided with a space, the heat insulating effect on the lid and the handle is increased, and the deterioration of the parts and the burn of the cook can be further prevented.

[Brief description of drawings]

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

FIG. 2 is a schematic partial cross-sectional view showing another example of the pan of the present invention in which only the main body is shown in cross section.

[Explanation of symbols]

 11 Pan Main Body 12 Opening 13 Bottom 14 Side 15 Handle 16 Lid 21 Stainless Steel Plate 22 Stainless Steel Plate 23 Carbon Member 24 Void

Claims (3)

[Claims] 1. A pan having a multi-layer structure including a container-shaped main body having a U-shaped cross section at a bottom portion and a side surface portion, the main body having a multilayer structure in which a good heat transfer material is sandwiched between stainless steel plates,
A pan that is characterized in that a carbon material having a metal carbide layer on the surface layer portion is selectively used as the good heat transfer material, and the carbon material and the stainless steel plate are contact-joined. 2. The pan according to claim 1, wherein the metal carbide is the same as the stainless steel component element, or 2 or more.
A pan characterized by being a carbide of at least one element. 3. The pan according to claim 1, wherein a void containing no carbon material is provided in the side surface of the main body.