JPH09252963A - Heat insulating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a sufficient reinforcing effect with one spacer by enlarging a contact area between a spacer and inner and outer tube bottoms. SOLUTION: This heat-insulating cooker is constitutionally provided with a vacuum double-structure body vessel 1 consisting of inner and outer cylindrical bottomed tubes 5, 6 vacuum-exhausted therebetween, an inner heating cooking vessel 2 to be freely taking in and out of the body vessel 1 and a lid body 3 insultingly constructed to close an opening part 1a of the body vessel 1 while the inner vessel 2 is taken in the body vessel 1. Then, a spacer 13 interposed between the bottoms 5e, 6b of the inner and outer tubes 5, 6 and having upper and lower abutting surfaces 13a, 13b having predetermined areas respectively abutting against both bottoms 5e, 6b and a spacer having an inclined surface 13c diverging from above to below is interposed between the upper and lower abutting surfaces 13a, 13b so that the contact area of the spacer 13 and inner and outer tube bottoms 5e, 6b can be largely ensured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating cooker for cooking liquid food such as stew while keeping it in a heat-retaining state.

[0002]

2. Description of the Related Art An adiabatic cooking device for cooking stew or other liquid food while keeping it in a heat-retaining state has been disclosed in Japanese Utility Model Publication No.
It is well known in the art as disclosed in Japanese Patent No. 14024.

This heat-insulating cooking utensil includes a main body container having a vacuum double structure, an inner container that can be stored in and taken out from the main body container, and an opening portion of the main body container that is closed with the inner container housed. And a lid having a heat insulating structure.

By the way, the main body container in the above-described heat insulating cooker is constructed by evacuating the inner and outer cylinders having a bottomed cylindrical shape, but it is necessary to reinforce the main body container after vacuum evacuation. Attempts have been made to provide a spacer made of a cylindrical body for reinforcement between the bottoms (see, for example, Japanese Utility Model Laid-Open No. 3-76535).

[0005]

However, when the spacer is formed of a cylindrical body, the contact surface with the inner and outer cylinders is the upper and lower end surfaces of the cylindrical body, so the contact area must be extremely small. . Therefore, in order to secure a sufficient reinforcing effect, it is necessary to use a plurality of spacers, and there is a problem that this leads to an increase in the number of assembly steps. The present invention has been made in view of the above points. By increasing the contact area between the spacer and the bottom of the inner and outer cylinders,
The purpose is to be able to exert a sufficient reinforcing effect with one piece.

[0006]

In the first basic structure of the present invention, as a means for solving the above problems, a main body container having a vacuum double structure in which a bottomed cylindrical inner and outer cylinders are evacuated to vacuum. And an inner container for heating and cooking that is housed in the main body container so that it can be freely taken in and out, and a lid having a heat insulating structure that closes the opening of the main body container with the inner container housed therein An instrument, having an upper and lower abutment surface of a predetermined area that abuts both bottom portions between the bottom portions of the inner and outer cylinders, and an inclination that spreads from the upper side to the lower side between the upper and lower abutment surfaces By interposing a spacer having a surface, a large contact area between the spacer and the bottom of the inner and outer cylinders can be secured.

In the first basic structure of the present invention, when the spacer has a hat shape with an open bottom,
It is preferable because the spacer can be easily formed by pressing.

Further, when the spacer is formed with a communication hole communicating with the inner and outer cylinders and an exhaust port for vacuum evacuation is formed on the bottom of the outer cylinder surrounded by the spacer, the exhaust port is separately provided. It is preferable in that it is not necessary to form a structure, and the structure can be simplified. In that case, the spacer is spotted on the bottom of the outer cylinder together with a holding member for holding a brazing material arranged outside the exhaust port. Welding makes it possible to fix the spacer and the holding member for holding the brazing material at the same time and in one place, which can greatly simplify the structure and reduce the cost, and the getter can be held on the spacer. By forming the getter holding portion for this purpose, the spacer can also serve as the getter holding member, and the structure can be simplified.

In the second basic structure of the present invention, as means for solving the above-mentioned problems, a main body container having a vacuum double structure in which a bottomed cylindrical inner and outer cylinders are evacuated to vacuum, and the inside of the main body container A heat-insulating cooking utensil comprising an inner container for heating and cooking that can be stored in and taken out from a container and a lid having a heat-insulating structure that closes the opening of the main body container in a state where the inner container is housed. A spacer having annular upper and lower abutting surfaces each of which has a predetermined area and is in contact with both bottom portions, and holds a getter with a recess surrounded by one side of the upper and lower abutting surfaces. As the getter holding portion, a large contact area between the spacer and the bottom of the inner and outer cylinders is secured, and the spacer also serves as the getter holding member.

In the first and second basic configurations of the present invention, when the positioning portions for positioning the spacers are formed on the bottoms of the inner and outer cylinders respectively, it is possible to prevent the displacement of the spacers during assembly. It is preferable in that the attaching workability is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First Embodiment FIGS. 1 and 2 show an adiabatic cooking appliance according to a first embodiment of the present invention.

As shown in FIG. 1, this heat-insulating cookware is
A bottomed cylindrical main body container 1, a bottomed cylindrical inner container 2 which is housed in the main body container 1 so as to be freely taken in and out, and the inner container 2
And a lid 3 that closes the opening 1a of the main body container 1 in a state where the container is stored. 4 is an inner container 2
Is a transparent inner lid for closing the opening 2a.

The main body container 1 is composed of a vacuum double container in which a space between a bottomed cylindrical inner cylinder 5 and an outer cylinder 6 made of stainless steel is evacuated. An annular resin-made shoulder member 7 is attached. It should be noted that the upper and lower opening edges of the inner and outer cylinders 5 and 6 are integrally provided with inverted L-shaped joint portions 5a and 6a which are joined to each other by welding. By doing so, the inner and outer cylinders 5,
Manufacturing of the main body container 1 by joining 6 becomes easy and reliable.

A step portion 5d is formed on the inner peripheral surface of the inner cylinder 5 as a boundary between an upper large diameter portion 5b and a lower small diameter portion 5c at an intermediate portion in the vertical direction. With such a shape, a space A having a predetermined width in the radial direction is formed between the upper portion of the inner peripheral surface of the main body container 1 and the inner container 2, and the inner container 2 has the same diameter in the vertical direction. Even if it has the above, it is possible to secure a space for accommodating the bracket 8 (described later) for attaching the handle attached to the inner container 2. That is, the capacity of the inner container 2 can be increased and the cleaning operation can be facilitated. Reference numeral 25 is a synthetic resin bottom member that covers the bottom of the main body container 1.

The inner container 2 comprises a pot for heating and cooking, and when the inner container 2 is housed in the main container 1, the main container opening 2a is located below the main container opening 1a. The shape is shallower than 1.

A pair of brackets 8 extending toward the outside of the main container 1 through the space A and the rim of the opening 1a of the main container 1 are provided at opposite positions of the upper end of the outer periphery of the inner container 2. , 8 are fixed. An outer end portion of each bracket 8 is a horizontal portion 8 which is divided into two forks at predetermined intervals.
a and 8a, and the horizontal portions 8a and 8a are provided with handles 9 and 9 for lifting the inner container 2.

The lid 3 has a bottom plate 3a made of synthetic resin which constitutes a lower surface, and a stainless steel top plate 3b which constitutes an upper surface.
And a synthetic resin shoulder ring 3c that couples the top plate 3b and the bottom plate 3a at the outer periphery, and a heat insulating material 10 is provided inside. Thereby, the heat insulation performance of the lid 3 is improved.

The lid 3 is connected via a hinge (not shown) at the rim of the opening 1a of the main body container 1, and the outer peripheral edge of the lid 3 of the bracket 8 of each of the handles 9 when the lid is closed. Notches 11, 11 for engaging the horizontal portions 8a, 8a are formed. This allows
When the lid 3 is closed, the lid 3 closes the upper opening 1 a of the main body container 1. Incidentally, the notch 11,
11 also positions the inner container 2 in the main body container 1 by engaging with the grips 9, 9. Reference numeral 12 is a handle for lifting the main body container 1,
The handle 12 is positioned directly below the handle 9.

Between the bottom portions 5e and 6b of the inner and outer cylinders 5 and 6, as shown in FIG. 2, there are provided spacers 13 which come into contact with the bottom portions 5e and 6b respectively and have a reinforcing action. The spacer 13 has a hat shape with an open bottom, and a donut-shaped contact surface 13a having a predetermined area for contacting the inner cylinder bottom portion 5e is formed on the upper surface of the spacer 13 at the lower end thereof. Has a flange-shaped contact surface 13b that contacts the outer cylinder bottom portion 6b.
Between the outer peripheral portion of "a" and the inner peripheral portion of the contact surface 13b, an inclined surface 13c is formed which widens from the upper side to the lower side. With this structure, the structure of the bottom of the main body container 1 is strengthened, and the inner container 2 can sufficiently withstand impacts during storage. Moreover, a large contact area between the spacer 13 and the inner and outer cylinder bottoms 5e and 6b can be secured, and
Since the outer diameter of the lower contact surface 13b can be increased,
The stability at the time of setting is improved, and one piece can exert a sufficient reinforcing effect. Furthermore, since the spacer 13 has a hat shape with an open bottom, it can be easily formed by press working.

By the way, since the heated inner container 2 is accommodated in the main body container 1, the inner cylinder 5 becomes hot and radiant heat is radiated. Therefore, in the present embodiment, in order to reduce the radiation of the radiant heat as much as possible, a metal foil (for example, copper foil, aluminum foil or the like) 26 is attached to the outer surface of the bottom portion 5e of the inner cylinder 5. In this way, radiation of radiant heat from the inner cylinder bottom portion 5e can be suppressed,
The heat retention performance is greatly improved.

Further, the inclined surface 13c of the spacer 13 is formed with a communication hole 14 for communicating the interior of the spacer 13 with the space between the inner and outer cylinders 5, 6. The communication hole 14
May be circular or slit-shaped.
An exhaust port 15 for vacuum exhaust is formed in the outer cylinder bottom portion 6b surrounded by the spacer 13, and a holding member for holding the brazing material 16 arranged outside the exhaust port 15 is formed. 17 is fixed by spot welding. According to this structure, it is not necessary to separately form the exhaust port 15, and the structure can be simplified. Reference numeral 18 is a getter holding portion for holding the getter 19.

The procedure for manufacturing the main body container 1 in the heat insulating cooker configured as described above will be described. The inner cylinder 5 is placed inside the outer cylinder 6 with the spacer 13 positioned at a predetermined position on the inner bottom portion of the outer cylinder 6. Insert the bottom 5 of the inner and outer cylinders 5 and 6
Spacer 13 is sandwiched between e and 6b, and the joint 5
The main container 1 is manufactured by joining a and 6a by welding.
Then, the main body container 1 is turned upside down and vacuum exhaust is performed in the heating furnace, whereby the main body container 1 becomes a heat insulating container having a vacuum double structure. That is, the spacer 13 is the bottom of the inner and outer cylinders 5.
Since it is sandwiched between e and 6b, there is no risk of positional deviation in the manufacturing process without using any special fixing means. And, as mentioned above,
Since a large contact area can be secured between the spacer 13 and the inner and outer cylinder bottoms 5e and 6b, and the outer diameter of the lower contact surface 13b can be increased, stability at the time of setting is improved,
A single piece can exert a sufficient reinforcing effect. In this case,
The areas of the contact surfaces 13a and 13b are preferably designed so that the heat conducted from the inner cylinder 5 to the outer cylinder 6 via the spacer 13 can be minimized and a sufficient size can be secured for reinforcement.

Second Embodiment FIG. 3 shows a main part of a main body container in an adiabatic cooking appliance according to a second embodiment of the present invention.

In this case, the lower contact surface (in other words, the flange portion) 13b of the spacer 13 is spot-welded to the outer cylinder bottom portion 5b together with the holding member 17 for holding the brazing material 16. Therefore, the fixing of the spacer 13 and the holding member 17 for holding the brazing material can be performed at the same time and at one place, so that the structure can be greatly simplified and the cost can be reduced. Further, the spacer 13 includes
A getter holding portion 19 for holding the getter 18 is formed, and the getter 18 is held in a sandwiched state between the getter holding portion 19 and the outer cylinder bottom portion 6b. Therefore, the spacer 13 can also be used as a getter holding member, and the structure can be simplified. In this case, the spacer 1
Since 3 is spot welded to the outer cylinder bottom 6b together with the holding member 17, it is not necessary to sandwich the spacer 13 between the inner and outer cylinder bottoms 5e and 6b when the main body container 1 is manufactured. The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted to avoid duplication.

Third Embodiment FIG. 4 shows a main part of a main body container in an insulating cookware according to a third embodiment of the present invention.

In this case, the bottom portions 5e, 6b of the inner and outer cylinders 5, 6 are
In between, there is provided a cylindrical spacer 13 having an open lower portion having annular upper and lower abutting surfaces 13a and 13b of a predetermined area that abut against the bottom portions 5e and 6b, respectively.
The recess surrounded by the upper contact surface 13a serves as a getter holding portion 19 for holding the getter 18. Also,
The lower contact surface 13b has a flange shape. Further, positioning portions 20 and 21 for positioning the spacer 13 are formed on the inner and outer cylinder bottom portions 5e and 6b, respectively. Therefore, it is possible to prevent the displacement of the spacer 13 at the time of assembling, and the assembling workability is improved. Moreover, since the getter 18 is held between the getter holding portion 19 formed on the spacer 13 and the inner cylinder bottom portion 5e, the spacer 13 can also serve as the getter holding member.
The structure can be simplified. Reference numeral 22 is a through hole that connects the getter holding portion 19 and the inside of the spacer 13. In this case, the exhaust port for vacuum exhaust is formed at a position not shown. The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted to avoid duplication.

Fourth Embodiment FIG. 5 shows a main part of a main body container in an adiabatic cooking appliance according to a fourth embodiment of the present invention.

In this case, the spacer 13 has a cylindrical shape whose upper part is open, and the inner and outer cylinder bottoms 5e, 6b are provided with positioning portions 20, 2 for positioning the spacer 13.
1 are formed respectively. Therefore, it is possible to prevent the displacement of the spacer 13 at the time of assembling, and the assembling workability is improved. An annular contact surface 13a and a getter holding portion 19 surrounded by the contact surface 13a are formed on the lower surface of the spacer 13, and the getter 18 includes the getter holding portion 19 and the outer cylinder bottom portion 6b. Held between. Therefore, the spacer 13 can also serve as the getter holding member, and the structure can be simplified. Reference numeral 22 is a through hole that connects the getter holding portion 19 and the inside of the spacer 13. In this case, the exhaust port for vacuum exhaust is formed at a position not shown. The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted to avoid duplication.

Fifth Embodiment FIG. 6 shows a main part of a main body container in an adiabatic cooking appliance according to a fifth embodiment of the present invention.

In this case, the spacer 13 is in the shape of a hat whose lower part is opened, and the contact surface 13a having a predetermined area for contacting the inner cylinder bottom portion 5e is formed on the upper surface thereof. A flange-shaped contact surface 13b that contacts the outer cylinder bottom portion 6b is formed at the lower end.
Between the outer peripheral portion of 3a and the inner peripheral portion of the contact surface 13b,
An inclined surface 13c is formed which widens toward the bottom from above. A communication hole 14 that communicates the inside of the spacer 13 and the space between the inner and outer cylinders 5 and 6 is formed in the inclined surface 13c. Further, a positioning portion 20 for positioning the spacer 13 is formed only on the bottom portion 5e of the inner cylinder 5. On the other hand, a trapezoidal raised portion 23 is formed in a portion of the outer cylinder bottom portion 6b surrounded by the spacer 13,
A recess 24 for accommodating the brazing material 16 is formed in the center of the raised portion 23. An exhaust port 15 for vacuum exhaust is formed at the center of the recess 24. Therefore, the vacuum evacuation is performed with the main body container 1 in the upright posture. In this case, the getter is installed at a location not shown.
The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted to avoid duplication.

[0032]

According to the present invention, in the heat-insulating cookware, upper and lower abutting surfaces having a predetermined area are provided between the bottom portions of the inner and outer cylinders and are in contact with the both bottom portions, respectively. Since a spacer having an inclined surface that widens toward the bottom from the bottom is interposed, a large contact area between the spacer and the bottom of the inner and outer cylinders can be secured and the stability of the set can be secured. Since a sufficient reinforcing effect can be exerted, there is an excellent effect that the number of assembling steps can be reduced and the cost can be greatly reduced.

Moreover, since there is no portion where the bottoms of the inner and outer cylinders come into direct contact with each other, the heat insulating effect does not deteriorate.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an insulated cooking appliance according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a main part of the main body container in the heat-insulating cookware according to the first embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view showing a main part of a main body container in the heat insulating cooker according to the second embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view showing a main part of a main body container in an insulating cookware according to a third embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view showing a main part of a main body container in the heat insulating cooker according to the fourth embodiment of the present invention.

FIG. 6 is an enlarged cross-sectional view showing a main part of a main body container in the heat insulating cooker according to the fifth embodiment of the present invention.

[Explanation of symbols]

1 is a main body container, 1a is an opening, 2 is an inner container, 3 is a lid,
5 is an inner cylinder, 5a is a joint portion, 5b is a large diameter portion, 5c is a small diameter portion, 5d is a step portion, 5e is a bottom portion, 6 is an outer cylinder, 6a is a joint portion, 6b is a bottom portion, 13 is a spacer, 13a, 13b is a contact surface, 13c is an inclined surface, 14 is a communication hole, 15 is an exhaust port,
16 is a brazing material, 17 is a holding member, 18 is a getter, 19 is a getter holding portion, and 20 and 21 are positioning portions.

Claims (7)

[Claims] 1. A main body container having a vacuum double structure in which a space between a bottomed cylindrical inner and outer cylinders is evacuated, an inner container for heating and cooking which is housed in and out of the main body container, and the inner container. A heat-insulating cooking utensil comprising a lid body having a heat-insulating structure for closing the opening of the main body container in a state of housing, wherein a predetermined area between the bottom portions of the inner and outer cylinders is in contact with both bottom portions. A heat-insulating cooking utensil characterized in that a spacer having upper and lower contact surfaces and having an inclined surface extending between the upper and lower contact surfaces and spreading downward from above is interposed. 2. The heat insulating cooker according to claim 1, wherein the spacer has a hat shape with an open bottom. 3. The spacer is formed with a communication hole communicating with the space between the inner and outer cylinders, and an exhaust port for vacuum evacuation is formed in the bottom of the outer cylinder surrounded by the spacer. The heat insulating cooker according to claim 2, wherein 4. The heat-insulating cookware according to claim 3, wherein the spacer is spot-welded to the bottom of the outer cylinder together with a holding member for holding a brazing material arranged outside the exhaust port. . 5. The heat insulating cooker according to claim 3, wherein a getter holding portion for holding a getter is formed on the spacer. 6. A main body container having a vacuum double structure in which a space between a bottomed cylindrical inner and outer cylinders is evacuated, an inner container for heating and cooking which is housed in and out of the main body container, and the inner container. A heat-insulating cooking utensil comprising a lid body having a heat-insulating structure for closing the opening of the main body container in a state of housing, wherein a predetermined area between the bottom portions of the inner and outer cylinders is in contact with both bottom portions. And a spacer having an annular upper and lower contact surface is provided, and a recess surrounded by one side of the upper and lower contact surfaces serves as a getter holding portion for holding a getter. 7. The heat insulating cooker according to claim 6, wherein the inner and outer cylinder bottoms are formed with positioning portions for positioning the spacers.