JP3834209B2 - Container structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a container structure that can be used for induction heating electric appliances such as induction heating rice cookers, inner containers and lids such as electric pots, ordinary heating pots, heat insulation containers, cold insulation containers, and the like. .
[0002]
[Prior art]
2. Description of the Related Art In recent years, containers such as rice cookers have been formed by, for example, forming a bottomed cylinder after press-pressing in a state where copper is interposed between a stainless steel plate and an aluminum plate. According to the container thus obtained, it is possible to uniformly heat the inside of the stainless steel plate by induction heating of the stainless steel plate with copper having high thermal conductivity.
[0003]
[Problems to be solved by the invention]
However, the container having the above-described structure has low heat insulation performance, and in particular, the high thermal conductivity of the aluminum plate acts to increase the heat loss. As a result, there is a problem that power consumption increases.
[0004]
Then, even if it is a clad material, this invention makes it a subject to provide the container structure which can exhibit the outstanding heat insulation performance, without generating the malfunction by a process.
[0005]
[Means for Solving the Problems]
As a means for solving the above problems, the present invention provides a container structure in which a clad material formed by joining a metal first plate material and a second plate material via an intermediate metal material has a bottomed cylindrical shape,
A vacuum space portion that is not partially joined is formed between the two plate materials, and the second plate material located on the outer surface side of the clad material is bulged outwardly, thereby forming the vacuum space portion. An accommodation recess for accommodating a gas adsorbing substance is formed.
[0006]
With this configuration, although it is a clad material, the heat insulation performance can be enhanced by the vacuum space. Moreover, by forming the accommodating recess, it is possible to secure a space for disposing the gas vacant material, and it is possible to reliably maintain a desired degree of vacuum even by post-processing of the clad material.
[0007]
The housing recess is formed by bulging the central portion of the second plate member outward, and forming the bottom surface of the second plate member of the clad material into a dome shape that curves upward. If the bottom surface of the second plate member is prevented from projecting from the outer peripheral portion of the second plate member, it is preferable in that a stable mounting state can be obtained despite the structure in which the housing recess is formed.
[0008]
It is preferable to provide a portion where the intermediate metal material is present and a portion where the intermediate metal material is not present, and to form a vacuum space portion communicating with the housing recess in the portion where the intermediate metal material is absent.
[0009]
With this configuration, the inside of the gas adsorbing material can be heated non-uniformly during induction heating while adsorbing the gas generated in the vacuum space to maintain the degree of vacuum at a desired value.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows an inner pot 1 for a rice cooker that employs a container structure according to this embodiment. This inner pot 1 is obtained by deep-drawing the clad material 2 shown in FIG. 2 into a bottomed cylindrical shape.
[0011]
The clad material 2 is formed by joining a circular first plate material 3 made of aluminum and a circular second plate material 4 made of stainless steel via copper plating layers 5a and 5b made of an intermediate metal material formed on each joining surface. This is the configuration. The first plate 3 is subjected to plating after the masking 6 shown in FIG. 3 is formed. Thereby, the copper plating layer 5a is formed only in the central part and the outer peripheral part. In particular, since the copper plating layer 5a in the central part is masked 6 radially from the central part, the copper plating layer 5a is formed in four equal parts in the circumferential direction. On the other hand, in the 2nd board | plate material 4, the copper plating layer 5b is formed in the whole joining surface. An accommodation recess 7 is formed in the central portion of the second plate member 4 downward. A gas adsorbing substance 8 is disposed in the accommodating recess 7. As the gas adsorbing substance 8, a pill-shaped Zr—V—Ti based sintered alloy or the like can be used. The first plate member 3 and the second plate member 4 are joined in a decompression layer (not shown). Therefore, a gap is formed in a portion where the copper plating layer 5 a is not formed in the joint surface of the first plate member 3, and this gap becomes the vacuum space 9.
[0012]
The clad material 2 obtained in this manner is formed into a bottomed cylindrical shape by deep drawing as described above, and becomes the inner pot 1. In this case, a dome shape is formed such that the bottom surface gradually protrudes upward toward the center. Thereby, the part protruded below by the accommodation recessed part 7 of the said 2nd board | plate material 4 does not protrude, and the inner pot 1 can be mounted in the stable state. In addition, since the accommodating recess 7 in which the gas adsorbing substance 8 is disposed is located on the bottom surface that is least deformed by the deep drawing process, the gas adsorbing substance 8 to be accommodated is damaged due to a force acting on it. There is no. Moreover, since the accommodating recess 7 communicates with the surrounding gaps by the radially extending gaps, the vacuum recesses 9 are formed, so that even if internal gas is generated, the accommodating recesses 7 can be reliably adsorbed by the gas adsorbing substance 8. The desired degree of vacuum can be maintained over a long period of time.
[0013]
Furthermore, since the copper plating layer 5a formed in the central portion of the first plate 3 is formed in a state of being divided into four locations, by induction heating the second plate 4, the first plate 3 has Heat is transmitted unevenly. As a result, convection of the contents is promoted, and a good cooked state can be obtained. The copper plating layer 5a is not limited to the above-described arrangement, and can take various forms such as a punching metal shape. Moreover, although it is preferable to provide the accommodation recessed part 7 in the center part of the bottom face of the inner pot 1 from a viewpoint of uniform gas adsorption | suction, what is necessary is just to provide in any position including a bottom face and a side part lower part.
[0014]
【The invention's effect】
As is apparent from the above description, according to the present invention, a vacuum space is formed in a portion where the intermediate metal material between the first plate and the second plate is not formed, and a gas is formed in the vacuum space. Since the accommodating recess capable of accommodating the adsorbing substance is formed, the heat insulating performance is high and it is possible to obtain a desired degree of vacuum over a long period of time regardless of the clad material.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an inner pot for a rice cooker formed of a clad material according to the present embodiment.
FIG. 2 is a partial cross-sectional view of a clad material according to the present embodiment.
3 is a plan view showing masking formed on the first plate member of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Inner pan 2 ... Cladding material 3 ... 1st board | plate material 4 ... 2nd board | plate material 5a, 5b ... Copper plating layer 6 ... Masking 7 ... Accommodating recessed part 8 ... Gas adsorption substance 9 ... Vacuum space

Claims (3)

In a container structure in which a clad material formed by joining a metal first plate material and a second plate material via an intermediate metal material has a bottomed cylindrical shape,
A vacuum space portion that is not partially joined is formed between the two plate materials, and the second plate material located on the outer surface side of the clad material is bulged outwardly, thereby forming the vacuum space portion. A container structure characterized in that an accommodating recess for accommodating a gas adsorbing substance is formed. The housing recess is formed by bulging the central portion of the second plate member outward, and forming the bottom surface of the second plate member of the clad material into a dome shape that curves upward. 2. The container structure according to claim 1, wherein a bottom surface of the first plate member is prevented from projecting from an outer peripheral portion of the second plate member. The container according to claim 1 or 2, wherein a portion with and without the intermediate metal material is provided, and a vacuum space portion communicated with the housing recess is formed in the portion without the intermediate metal material. Construction.

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