JPH1118926A - Vacuum double vessel for electromagnetic induction heating cooking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of heat preserving performance with the lapse of time by forming a covering layer of magnetic metal on an outside surface of an inner vessel of a vacuum double vessel in which a dead space between the inner vessel and an outer vessel is made vacuous and which is composed of a nonmagnetic material. SOLUTION: In a vacuum double vessel 1, an inner vessel 2 and an outer vessel 3 composed of a nonmagnetic material are joined together in an upper opening part, and a dead space between the inner vessel 2 and the outer vessel 3 is made vacuous. A covering layer 5 composed of magnetic metal is formed on a bottom surface of the inner vessel 2 and an outside surface of a side surface lower part. Transition metal such as iron, cobalt and nickel or these allay is proper as magnetic metal to form the covering layer 5. A method to form the covering layer 5 can be performed by plating or thermally spraying or cladding magnetic metal on an outside surface of the inner vessel 2. Foil 6 of aluminium or copper wrapped by being wound round an outside surface of the inner vessel 2, is used to cut off a movement of heat by radiation between the inner vessel 2 and the outer vessel 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum double container capable of heating and cooking contents using an electromagnetic induction heating cooker.

[0002]

2. Description of the Related Art Conventionally, there has been known a vacuum double container in which an inner container is fitted in an outer container, upper openings of the inner container and the inner container are joined, and a space between the inner container and the outer container is evacuated. It is widely used as an insulated heat insulating container such as a mahobin.

[0003] In general, when cooking food, food to be cooked contained in a container is heated from the outside to raise the temperature, and then the degree of heating is reduced, and the food is heated with a low heat or kept warm. That is being done.

In the above-described vacuum double container, if the contents can be heated, the contents can be heated and then the heated state can be maintained by the heat retaining power of the vacuum double container. Although the container has high heat insulating properties, it cannot heat the contents from outside.

[0005] It is also known to place a heater in a vacuum double container, or to embed a heater in the bottom of an inner container and heat with these heaters. There is no other choice but to the structure, and the structure may be complicated and the heat insulation performance may be reduced.

[0006] Further, according to the electromagnetic induction heating cooker, it is possible to heat through a vacuum layer, and a stainless steel vacuum double container is used to heat the inner container of the vacuum double container by induction heating. Cooking is also conceivable.

[0007]

However, SUS-
Non-magnetic stainless steel such as 304 cannot efficiently generate heat using an electromagnetic induction heating cooker, and SUS-4
In the case of stainless steel having a magnetic property such as 30, the induction heating of the inner container is possible, but it is inappropriate because the outer container also generates heat at the same time. SUS-430 that can heat the inner container by induction
By using non-magnetic SUS-3040 for the outer container, it is possible to generate heat only in the inner container, but it is difficult to weld in the upper opening because the materials of the inner container and the outer container are different. The heat retention performance may be reduced.

The present invention has been made in view of the above circumstances, and has as its object to provide a vacuum double container capable of heating and cooking the contents using an electromagnetic induction heating cooker.

[0009]

According to the present invention, there is provided a vacuum double container made of a non-magnetic material, wherein the space between the inner container and the outer container is evacuated. Wherein a metal coating layer having the following formula is formed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The drawing shows a vacuum double container 1 of the present invention, in which an inner container 2 made of a non-magnetic material and an outer container 3 are shown.
Are joined at the upper opening, and the inner container 2
The space 4 between the container 3 and the outer container 3 is evacuated.

As the non-magnetic material constituting the inner container 2 and the outer container 3, non-magnetic stainless steel such as SUS-304, glass, ceramics, plastics, and the like can be used.

In the present invention, a coating layer 5 made of a magnetic metal is formed on the outer surface of the bottom surface and the lower part of the side surface of the inner container 2. As the magnetic metal forming the coating layer 5, transition metals such as iron, cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium, and platinum, or alloys thereof are suitable.

As a method of forming the coating layer 5, the above-mentioned metal can be plated on the outer surface of the inner container 2, or can be sprayed or clad. The thickness of the coating layer 5 is preferably about 130 to 300 microns when plating or cladding is used, and 400 microns or more when spraying.

Reference numeral 6 denotes an aluminum or copper foil wound around and wrapped around the outer surface of the inner container 2, which blocks heat transfer between the inner container 2 and the outer container 3 due to radiation. Inner container 2
Of the inner surface of the inner container 2 instead of the foil 6
May be plated with copper or silver on the outside and the inside of the outer container 3.

[0015]

In the present invention, since the coating layer 5 made of a magnetic material is formed on the outer surface of the inner container 2, when the vacuum double container 1 is placed on an electromagnetic induction heating cooker,
Lines of magnetic force generated from the cooker penetrate the outer container 3 and the space 4 made of a non-magnetic material, and generate an induced current in the coating layer 5 of the magnetic material. The induced current causes the coating layer 5 to generate heat and the inner container 2. Heat the contents through the wall of the.

Further, the present invention has a vacuum double container structure in which the space 4 between the inner container 2 and the outer container 3 is evacuated in an ordinary vacuum bottle or the like, so that the container itself is expensive. It has a heat retaining property, and the content cooked by electromagnetic induction can be kept warm for a long time.

[0017]

Therefore, according to the present invention, the vacuum double container 1
There is no need to provide an internal heater or embed a heater in the inner container 2. Although it is a simple vacuum double container itself, it heats the contents from the outside using a commercially available electromagnetic induction heating cooker. can do.

Further, since the present invention is a vacuum double container itself, it has a high heat insulating property, can keep cooked contents as it is, and can cook and keep heat in a single container. It can be performed together.

The heat is generated by the coating layer 5 formed on the inner container 2.
Therefore, the inner container 2 and the outer container 3 can be made of the same material, and the upper openings of both can be reliably welded and joined.

The vacuum double container 1 of the present invention may be an independent unit separated from the electromagnetic induction heating cooker, but the combination of the electromagnetic induction heating cooker and the vacuum double container of the present invention provides It can also be used as a kettle pot, cooking warming appliance, rice cooker, or the like.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view of a vacuum double container for electromagnetic induction heating cooking according to the present invention; 1 vacuum double container 2 inner container 3 outer container 4 void 5 coating layer

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI A47J 36/02 A47J 36/02 B

Claims (1)

[Claims] 1. A vacuum double container (1) made of a non-magnetic material, wherein a space (4) between an inner container (2) and an outer container (3) is evacuated. A vacuum double container for electromagnetic induction heating, characterized in that a magnetic metal coating layer (5) is formed on the outer surface.